WO2019188207A1 - 電解液、電気化学デバイス、リチウムイオン二次電池、モジュール及び化合物 - Google Patents
電解液、電気化学デバイス、リチウムイオン二次電池、モジュール及び化合物 Download PDFInfo
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- WO2019188207A1 WO2019188207A1 PCT/JP2019/009744 JP2019009744W WO2019188207A1 WO 2019188207 A1 WO2019188207 A1 WO 2019188207A1 JP 2019009744 W JP2019009744 W JP 2019009744W WO 2019188207 A1 WO2019188207 A1 WO 2019188207A1
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- WIPO (PCT)
- Prior art keywords
- group
- carbonate
- anhydride
- fluorine
- carbon atoms
- Prior art date
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- 239000008151 electrolyte solution Substances 0.000 title claims abstract description 125
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- CTSAXXHOGZNKJR-UHFFFAOYSA-N methyl 2-diethoxyphosphorylacetate Chemical compound CCOP(=O)(OCC)CC(=O)OC CTSAXXHOGZNKJR-UHFFFAOYSA-N 0.000 description 1
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- DTQVDTLACAAQTR-UHFFFAOYSA-N trifluoroacetic acid Substances OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 1
- WRECIMRULFAWHA-UHFFFAOYSA-N trimethyl borate Chemical compound COB(OC)OC WRECIMRULFAWHA-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- CYTQBVOFDCPGCX-UHFFFAOYSA-N trimethyl phosphite Chemical compound COP(OC)OC CYTQBVOFDCPGCX-UHFFFAOYSA-N 0.000 description 1
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- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- 239000012953 triphenylsulfonium Substances 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- LJHXAZLYJUNWIS-UHFFFAOYSA-N tris(trimethoxysilyl) phosphate Chemical compound CO[Si](OC)(OC)OP(=O)(O[Si](OC)(OC)OC)O[Si](OC)(OC)OC LJHXAZLYJUNWIS-UHFFFAOYSA-N 0.000 description 1
- INLISQDIHLNRBW-UHFFFAOYSA-N tris(trimethoxysilyl) phosphite Chemical compound CO[Si](OC)(OC)OP(O[Si](OC)(OC)OC)O[Si](OC)(OC)OC INLISQDIHLNRBW-UHFFFAOYSA-N 0.000 description 1
- YZYKZHPNRDIPFA-UHFFFAOYSA-N tris(trimethylsilyl) borate Chemical compound C[Si](C)(C)OB(O[Si](C)(C)C)O[Si](C)(C)C YZYKZHPNRDIPFA-UHFFFAOYSA-N 0.000 description 1
- VMZOBROUFBEGAR-UHFFFAOYSA-N tris(trimethylsilyl) phosphite Chemical compound C[Si](C)(C)OP(O[Si](C)(C)C)O[Si](C)(C)C VMZOBROUFBEGAR-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C307/00—Amides of sulfuric acids, i.e. compounds having singly-bound oxygen atoms of sulfate groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
- C07C307/02—Monoamides of sulfuric acids or esters thereof, e.g. sulfamic acids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/58—Liquid electrolytes
- H01G11/64—Liquid electrolytes characterised by additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/04—Hybrid capacitors
- H01G11/06—Hybrid capacitors with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
- H01M2300/0034—Fluorinated solvents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present disclosure relates to an electrolytic solution, an electrochemical device, a lithium ion secondary battery, a module, and a compound.
- Patent Document 1 describes an electrolytic solution containing a compound such as (CH 3 ) 2 NSO 3 Li, (C 2 H 5 ) 2 NSO 3 Li, or the like.
- the present disclosure relates to an electrolytic solution including a compound represented by the following general formula (1).
- General formula (1) (Wherein R 101 and R 102 are each independently -H, -F, Formula: —O p101 — (SiR 103 2 O) n101 —SiR 104 3 (R 103 and R 104 are each independently an alkyl group in which one or more hydrogens may be substituted with fluorine, one or more An alkenyl group in which hydrogen may be substituted with fluorine, an alkynyl group in which one or more hydrogens may be substituted with fluorine, or an aryl group in which one or more hydrogens are substituted with fluorine, n101 is 0 A group represented by the following integer: p101 is 0 or 1.
- R 101 and R 102 are alkyl groups, at least one of them contains one or more divalent to hexavalent heteroatoms in the structure, or one or more hydrogen atoms are fluorine or carbon number Substituted with 0-7 functional groups.
- the present disclosure also relates to an electrochemical device comprising the electrolyte solution.
- the present disclosure also relates to a lithium ion secondary battery including the electrolyte solution.
- the present disclosure also relates to a module including the electrochemical device or the lithium ion secondary battery.
- the present disclosure also relates to a compound represented by the following general formula (1-1).
- Formula (1-1) (Wherein R 201 and R 202 are each independently -H, -F, Formula: —O p101 — (SiR 103 2 O) n101 —SiR 104 3 (R 103 and R 104 are each independently an alkyl group in which one or more hydrogens may be substituted with fluorine, one or more An alkenyl group in which hydrogen may be substituted with fluorine, an alkynyl group in which one or more hydrogens may be substituted with fluorine, or an aryl group in which one or more hydrogens are substituted with fluorine, n101 is 0 A group represented by the following integer: p101 is 0 or 1.
- the substituent may contain one or more di- to hexavalent heteroatoms in their structure, and one or more hydrogens may be substituted with fluorine or a functional group having 0 to 7 carbon atoms. .
- at least one of R 201 and R 202 is —F.
- an electrochemical device having low resistance can be provided.
- An electrochemical device provided with the electrolytic solution has low resistance.
- the novel lithium sulfamate compound can also be provided.
- the electrolytic solution of the present disclosure includes a compound represented by the following general formula (1) (hereinafter also referred to as compound (1)).
- General formula (1) (Wherein R 101 and R 102 are each independently -H, -F, Formula: —O p101 — (SiR 103 2 O) n101 —SiR 104 3 (R 103 and R 104 are each independently an alkyl group in which one or more hydrogens may be substituted with fluorine, one or more An alkenyl group in which hydrogen may be substituted with fluorine, an alkynyl group in which one or more hydrogens may be substituted with fluorine, or an aryl group in which one or more hydrogens are substituted with fluorine, n101 is 0 A group represented by the following integer: p101 is 0 or 1.
- the electrolytic solution of the present disclosure can provide an electrochemical device having low resistance by having the above characteristics.
- the electrolytic solution of the present disclosure can also provide an electrochemical device having excellent high-temperature storage characteristics (for example, a low gas generation amount after high-temperature storage and a high capacity retention rate).
- the substituents are —H, —F, a group represented by the above formula: —O p101 — (SiR 103 2 O) n101 —SiR 104 3 , the alkyl group, the alkenyl group, The alkynyl group, the aryl group, the —SO 2 X 101 , the —SO 3 X 102 , or the hydrocarbon group is shown.
- the above substituents may contain one or more di- to hexavalent heteroatoms in their structure, and one or more hydrogens may be substituted with fluorine or a functional group having 0 to 7 carbon atoms. Good.
- Examples of the functional group that the substituent may have include a phenyl group, anisyl group, benzyl group, cyano group, and trialkylsilyl group (the alkyl group preferably has 1 to 4 carbon atoms).
- —SO 2 X 103 (X 103 is —H, —F, or an alkyl group in which one or more hydrogens may be substituted with fluorine), and one or more hydrogens are substituted with fluorine.
- An optionally substituted alkyl group having 1 to 7 carbon atoms, a saturated heterocyclic group having 1 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms is preferable.
- the number of carbon atoms of the alkyl group in X 103 is, for example, 1 to 10.
- R 101 and R 102 are the alkyl group, at least one of them contains one or more heteroatoms in the structure, or one or more hydrogens are substituted with fluorine or the functional group. Need to be.
- the alkyl group may be linear, branched or cyclic, and preferably has 1 to 10 carbon atoms, more preferably 1 to 7 carbon atoms.
- the alkyl group may be a fluoroalkyl group in which hydrogen bonded to carbon is substituted with fluorine, or may be one in which hydrogen bonded to carbon is substituted with the above functional group.
- the alkenyl group may be linear, branched or cyclic, and preferably has 2 to 10 carbon atoms, more preferably 2 to 7 carbon atoms.
- the alkenyl group may be a fluoroalkylene group in which hydrogen bonded to carbon is substituted with fluorine, or may be one in which hydrogen bonded to carbon is substituted with the above functional group.
- the alkynyl group may be linear, branched or cyclic, and preferably has 2 to 10 carbon atoms, more preferably 2 to 7 carbon atoms.
- the alkynyl group may be a fluoroalkynyl group in which hydrogen bonded to carbon is substituted with fluorine, or may be one in which hydrogen bonded to carbon is substituted with the above functional group.
- the aryl group preferably has 6 to 7 carbon atoms.
- the aryl group may be a fluoroaryl group in which hydrogen bonded to carbon is substituted with fluorine, or may be one in which hydrogen bonded to carbon is substituted with the above functional group.
- R 101 and R 102 have the formula: —O p101 — (SiR 103 2 O) n101 —SiR 104 3 (R 103 and R 104 may each independently have one or more hydrogens replaced with fluorine.
- n101 is an integer of 0 or more
- p101 is 0 or 1.
- the alkyl group in which one or more hydrogen atoms may be substituted with fluorine preferably has 1 to 10 carbon atoms, and more preferably 1 to 7 carbon atoms.
- the alkenyl group and alkynyl group in which one or more hydrogen atoms may be substituted with fluorine preferably have 2 to 10 carbon atoms, and more preferably 2 to 7 carbon atoms.
- the aryl group in which one or more hydrogen atoms may be substituted with fluorine preferably has 6 to 8 carbon atoms, and more preferably 6 to 7 carbon atoms.
- n101 is an integer of 0 or more, preferably 2000 or less, more preferably an integer of 0 to 100, and still more preferably 0 to 10.
- R 101 and R 102 may be —SO 2 X 101 (X 101 is —H, —F, or an alkyl group in which one or more hydrogens may be substituted with fluorine). Good.
- the number of carbon atoms of the alkyl group in the —SO 2 X 101 group is preferably 1 to 10, and more preferably 1 to 7.
- R 101 and R 102 may be —SO 3 X 102 (X 102 is —H, —F, or an alkyl group in which one or more hydrogens may be substituted with fluorine). Good.
- the carbon number of the alkyl group in the —SO 3 X 102 group is preferably 1 to 10, more preferably 1 to 7.
- R 101 and R 102 include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a tert-butyl group, and a pentyl group.
- Chain alkyl groups such as i-pentyl group, neopentyl group, sec-pentyl group, 3-pentyl group, tert-pentyl group and hexyl group; cyclic alkyl groups such as cyclopentyl group, cyclohexyl group, norbornanyl group and 1-adamantyl group Groups: vinyl groups, 1-propenyl groups, 2-propenyl groups (allyl groups), 2-butenyl groups, 1,3-butadienyl groups and other alkenyl groups; ethynyl groups, 1-propynyl groups, 2-propynyl groups, 2- Alkynyl groups such as butynyl group; trifluoromethyl group, 2,2,2-trifluoroethyl group, 1,1,2,2-tetrafluoro Halogenated alkyl groups such as til, pentafluoroethyl, 2,2,3,3,3-pentafluoropropy
- the hydrocarbon group is a group in which R 101 and R 102 are combined to form a cyclic structure
- R 101 and R 102 are pyrrolidino groups
- a cyclic amino group such as a piperidino group may be formed, or a heterocyclic amino group such as a 4-morpholino group containing a hetero atom, a succinimidyl group or a maleimidyl group may be formed.
- one or more hydrogen bonded to carbon may be substituted with fluorine, or hydrogen bonded to carbon may be substituted with the above functional group.
- the cyclic structure may contain a double bond or a triple bond.
- the substituent may contain a divalent to hexavalent hetero atom.
- the hetero atom include an oxygen atom (O), a sulfur atom (S), a nitrogen atom (N), a silicon atom (Si), a phosphorus atom (P), and a boron atom (B). More preferably, they are an oxygen atom, a sulfur atom, or a nitrogen atom.
- Me represents a methyl group
- Et represents an ethyl group
- n-Pr represents a normal propyl group
- i-Pr represents an isopropyl group
- n-Bu represents a normal butyl group
- i-Bu represents iso-butyl
- S-Bu represents a sec-butyl group
- t-Bu represents a tert-butyl group
- TMS represents a trimethylsilyl group
- TBDMS represents a tert-butyldimethylsilyl group.
- R may be bonded to any carbon atom constituting the benzene ring.
- R may be present at any position of o-, m-, and p-. Also good.
- the illustration of the compound in this specification shall also include the geometric isomer (when it exists) of the said compound, and is not limited to the specific example described.
- a compound represented by the following formula is particularly preferable.
- the present disclosure also relates to a compound represented by the following general formula (1-1) (hereinafter, also referred to as compound (1-1)) among the compounds (1).
- Formula (1-1) (Wherein R 201 and R 202 are each independently -H, -F, Formula: —O p101 — (SiR 103 2 O) n101 —SiR 104 3 (R 103 and R 104 are each independently an alkyl group in which one or more hydrogens may be substituted with fluorine, one or more An alkenyl group in which hydrogen may be substituted with fluorine, an alkynyl group in which one or more hydrogens may be substituted with fluorine, or an aryl group in which one or more hydrogens are substituted with fluorine, n101 is 0 A group represented by the following integer: p101 is 0 or 1.
- the substituent may contain one or more di- to hexavalent heteroatoms in their structure, and one or more hydrogens may be substituted with fluorine or a functional group having 0 to 7 carbon atoms. .
- at least one of R 201 and R 202 is —F.
- R 201 and R 202 needs to be —F.
- SO 2 X 101 and the above —SO 3 X 102 include the same as R 101 and R 102 in the general formula (1).
- Examples of the compound (1-1) include compounds represented by the following formula.
- the compound (1-1) can be used as a functional compound such as a pharmaceutical intermediate, a surfactant, and a food additive in addition to the electrolytic solution component.
- Compound (1) (excluding compound (1-1)) is, for example, the following general formula (a): (Wherein X 111 is fluorine, chlorine, bromine or iodine) and the following general formula (b): (In the formula, R 101 and R 102 are the same as above) Production comprising the step (1) of reacting the compound (b) represented by the formula (1) to obtain the compound (1) represented by the general formula (1) It can be suitably produced by a method (hereinafter also referred to as a first production method).
- X 111 in the general formula (a) is fluorine, chlorine, bromine or iodine, and chlorine is preferable from the viewpoint of availability of raw material compounds and reactivity.
- the amount of compound (b) used in step (1) is preferably 1.0 mol times or more, more preferably 1.1 mol times or more, still more preferably 1.5 mol times or more with respect to compound (a).
- an upper limit is not specifically limited, Usually, it is 3.0 mol times or less, 2.5 mol times or less are preferable and 2.2 mol times or less are more preferable.
- the reaction of step (1) is preferably carried out in the presence of a base (excluding the above compound (b)).
- the base include amines (excluding the compound (b)), inorganic bases and the like.
- the amines include triethylamine, tri (n-propyl) amine, tri (n-butyl) amine, diisopropylethylamine, cyclohexyldimethylamine, pyridine, lutidine, ⁇ -collidine, N, N-dimethylaniline, N- Methylpiperidine, N-methylpyrrolidine, N-methylmorpholine, 1,8-diazabicyclo [5.4.0] -7-undecene (DBU), 1,5-diazabicyclo [4.3.0] -5-nonene, Examples include 1,4-diazabicyclo [2.2.2] octane (DABCO), 4-dimethylaminopyridine (DMAP), proton sponge, and the like.
- the inorganic base examples include lithium hydroxide, potassium hydroxide, sodium hydroxide, calcium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, cesium carbonate, cesium bicarbonate, and hydrogen carbonate.
- examples thereof include lithium, cesium fluoride, potassium fluoride, sodium fluoride, lithium chloride, and lithium bromide.
- the above bases the above amines are preferable.
- the amines are preferably triethylamine or pyridine.
- the base may be solid at room temperature or liquid. In the case of a solid, it can be used by dissolving in a solvent.
- the total amount of the base and the compound (b) used is preferably 2.0 moles or more, more preferably 2.1 moles or more, based on the amount of the compound (a) used. 2.2 mol times or more is more preferable. Although an upper limit is not specifically limited, Usually, it is 4.0 mol times or less, 3.0 mol times or less are preferable and 2.6 mol times or less are more preferable.
- the ratio of the base to the compound (b) is preferably in the range of 0.01: 0.99 to 0.60: 0.40 for base: compound (b), and 0.40: 0 More preferably within the range of .60 to 0.55: 0.45, still more preferably within the range of 0.45: 0.55 to 0.50: 0.50.
- the temperature in the step (1) is not limited as long as the above reaction proceeds, for example, preferably 100 ° C. or lower, more preferably 50 ° C. or lower, and further preferably 30 ° C. or lower. Further, it is preferably ⁇ 50 ° C. or higher, more preferably ⁇ 30 ° C. or higher, and further preferably ⁇ 10 ° C. or higher. If it is the said temperature, side reaction will not advance easily and reaction can be advanced efficiently.
- the reaction of step (1) can be performed in a solvent.
- the solvent is preferably a non-aqueous solvent.
- a nonaqueous solvent having low reactivity with the compounds (a) and (b) is preferable.
- a nonaqueous solvent in which the compounds (a) and (b) are dissolved is preferable.
- the solubility of the compound (a) at room temperature is preferably 0.1% by mass or more, more preferably 1% by mass or more, and further preferably 5% by mass or more.
- the solubility of the compound (b) at room temperature is preferably 0.1% by mass or more, more preferably 1% by mass or more, and further preferably 5% by mass or more.
- the boiling point of the solvent is preferably 300 ° C. or less, more preferably 200 ° C. or less, and further preferably 150 ° C. or less at normal pressure.
- the solvent include chain esters such as methyl acetate, ethyl acetate, ethyl methanesulfonate, and methyl ethanesulfonate; chain carbonate esters such as dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate; ethylene carbonate, Cyclic carbonates such as propylene carbonate and fluoroethylene carbonate; chain carboxylic esters such as methyl acetate, ethyl acetate and methyl propionate; halogenated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform and carbon tetrachloride Chain ethers such as diethyl ether, ethyl methyl ether, tert-butyl methyl ether and dimethoxyethane; cyclic ethers such as tetrahydrofuran, 1,3-dioxane and 1,4-dioxane;
- dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, acetonitrile, dichloromethane, or chloroform is preferable, and dimethyl carbonate and acetonitrile are more preferable.
- These nonaqueous solvents may be used alone or in combination.
- it is a protic solvent, if it is a higher alcohol etc. which do not react with a compound (a), a compound (b), and a compound (1), it can be used.
- the ratio of the nonaqueous solvent to the compound (a) in the step (1) is not particularly limited.
- the weight ratio is preferably 100 times or less, more preferably 50 times or less, and further preferably 25 times or less.
- 2 times or more are preferable by weight ratio, 3 times or more are more preferable, and 5 times or more are still more preferable.
- the unreacted compound (a) hardly precipitates and can be produced more easily.
- Step (1) may be, for example, a method of dropping the compound (a) while stirring the solution of the compound (b), or a method of dropping the compound (b) into the solution of the compound (a).
- the compound (a) or the compound (2) is added dropwise, the compound (a) or the compound (b) may be diluted.
- X 111 in the general formula (c) is fluorine, chlorine, bromine or iodine, and chlorine is preferable from the viewpoint of availability and reactivity of the compound (c) as a raw material.
- the lithium source in step (2) is lithium fluoride, lithium chloride, lithium bromide, lithium iodide, lithium hydride, n-butyllithium, sec-butyllithium, tert-butyllithium, lithium hydroxide, or metal lithium. It is preferable that it is lithium fluoride, lithium chloride, lithium bromide or lithium iodide, and lithium chloride is more preferable.
- the amount of the lithium source used in the step (2) is preferably 1.5 mol times or less, more preferably 1.2 mol times or less, still more preferably 1.0 mol times or less with respect to the compound (c). Although a minimum is not specifically limited, Usually, it is 0.50 mol times or more, 0.80 mol times or more is preferable and 0.90 mol times or more is more preferable.
- the temperature in a process (2) will not be limited if the said reaction advances, For example, 150 degrees C or less is preferable, 120 degrees C or less is more preferable, 90 degrees C or less is still more preferable. Further, it is preferably ⁇ 20 ° C. or higher, more preferably 0 ° C. or higher, and further preferably 20 ° C. or higher. If it is the said temperature, side reaction will not advance easily and reaction can be advanced efficiently.
- the reaction in step (2) can be performed in the absence of a solvent, but can also be performed in a solvent.
- the solvent to be used is not particularly limited as long as it is a non-aqueous solvent, and more preferably an aprotic solvent.
- an aprotic solvent having low reactivity with the compound (c) is preferable.
- an aprotic solvent in which the compound (c) is dissolved is preferable.
- the solubility of the compound (c) at room temperature is preferably 0.1% by mass or more, more preferably 1% by mass or more, and further preferably 5% by mass or more.
- the boiling point of the solvent is preferably 300 ° C. or less, more preferably 200 ° C. or less, and further preferably 150 ° C. or less at normal pressure.
- the solvent include chain esters such as methyl acetate, ethyl acetate, ethyl methanesulfonate, and methyl ethanesulfonate; chain carbonate esters such as dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate; ethylene carbonate, Cyclic carbonates such as propylene carbonate and fluoroethylene carbonate; chain carboxylic esters such as methyl acetate, ethyl acetate and methyl propionate; halogenated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform and carbon tetrachloride Chain ethers such as diethyl ether, ethyl methyl ether, tert-butyl methyl ether and dimethoxyethane; cyclic ethers such as tetrahydrofuran, 1,3-dioxane and 1,4-dioxane;
- dimethyl carbonate, ethyl methyl carbonate, or diethyl carbonate, acetonitrile, dichloromethane, or chloroform is preferable, and dimethyl carbonate and acetonitrile are more preferable.
- These nonaqueous solvents may be used alone or in combination. Moreover, even if it is a protic solvent, if it is a higher alcohol etc. which do not react with a compound (c) and a compound (a), it can be used.
- the ratio of the non-aqueous solvent to the compound (c) is not particularly limited.
- the volume ratio is preferably 100 times or less, more preferably 50 times or less, and further preferably 25 times or less.
- 1 time or more is preferable by volume ratio, 3 times or more is more preferable, and 5 times or more is still more preferable.
- the resulting compound (c) is difficult to precipitate and can be produced more easily.
- the step (2) may be performed by adding a lithium source while stirring the solution of the compound (c), or the compound (c) is dropped while dissolving or suspending the lithium source in a solvent. It may be a thing. When dropping, the compound (c) may be diluted. In the absence of a solvent, a lithium source may be added to the compound (c), or a compound (c) may be added to the lithium source. The lithium source may be used alone or as a solution.
- step (2) is performed before step (1). Between step (2) and step (1), a step of recovering the compound (a) obtained in step (2) from the solvent may be included, and further a purification step such as recrystallization may be included. Good. When the step (2) and the step (1) are continuously performed in the same solvent, the above recovery step and purification step are not necessary.
- the first production method may include a step of recovering the compound (1) obtained in the step (1) from the solvent after the step (1).
- a purification step may be included.
- Compound (1) (excluding compound (1-1)) has the general formula (c): (Wherein X 111 is fluorine, chlorine, bromine or iodine) and the general formula (d): (In the formula, R 101 and R 102 are the same as above)
- a production method comprising a step (3) of obtaining a compound (1) represented by the general formula (1) by reacting with the compound (d) represented by the formula (1) (Hereinafter, also referred to as a second production method) can be suitably produced.
- X in the general formula (c) is fluorine, chlorine, bromine or iodine, and chlorine is preferable from the viewpoint of availability and reactivity of the compound (c) as a raw material.
- R 101 and R 102 include the same compounds as the compounds (b) and (1) described above, in that the basicity of the compound (d) is reduced and the heat of reaction with the compound (c) is reduced.
- a substituent having an electron withdrawing substituent is preferable.
- the electron-withdrawing substituent a fluorinated alkyl group, a fluorinated alkenyl group, a fluorinated alkynyl group, a sulfonyl group, a cyano group, or a cyanomethyl group is particularly preferable.
- electron withdrawing group examples include trifluoromethyl group, 2,2,2-trifluoroethyl group, pentafluoroethyl group, 2,2,3,3,3-pentafluoropropyl group, heptafluoro group.
- the amount of compound (d) used in step (3) is preferably 0.7 moles or more, more preferably 0.8 moles or more, still more preferably 0.9 moles or more, relative to compound (c). Although an upper limit is not specifically limited, Usually, it is 2.0 mol times or less, 1.5 mol times or less are preferable and 1.1 mol times or less are more preferable.
- the temperature in a process (3) will not be limited if the said reaction advances, For example, 200 degrees C or less is preferable, 170 degrees C or less is more preferable, 150 degrees C or less is still more preferable. Moreover, 0 degreeC or more is preferable, 20 degreeC or more is more preferable, and 50 degreeC or more is still more preferable. If it is the said temperature, reaction can be advanced efficiently.
- the reaction of step (3) can be performed in a solvent.
- the solvent is preferably a non-aqueous solvent.
- a nonaqueous solvent having low reactivity with the compound (c), the compound (d) and the compound (1) is preferable.
- a nonaqueous solvent in which the compounds (c) and (d) are dissolved is preferable.
- the solubility of the compound (c) at room temperature is preferably 0.1% by mass or more, more preferably 1% by mass or more, and further preferably 5% by mass or more.
- the solubility of the compound (d) at room temperature is preferably 0.1% by mass or more, more preferably 1% by mass or more, and further preferably 5% by mass or more.
- 300 degreeC or less is preferable at a normal pressure, 200 degrees C or less is more preferable, 150 degrees C or less is still more preferable.
- the solvent include chain esters such as methyl acetate, ethyl acetate, ethyl methanesulfonate, and methyl ethanesulfonate; chain carbonate esters such as dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate; ethylene carbonate, Cyclic carbonates such as propylene carbonate and fluoroethylene carbonate; chain carboxylic esters such as methyl acetate, ethyl acetate and methyl propionate; halogenated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform and carbon tetrachloride Chain ethers such as diethyl ether, ethyl methyl ether, tert-butyl methyl ether and dimethoxyethane; cyclic ethers such as tetrahydrofuran, 1,3-dioxane and 1,4-dioxane;
- dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, acetonitrile, or diethyl ether is preferable, and dimethyl carbonate, acetonitrile, or diethyl Ether is more preferred.
- These nonaqueous solvents may be used alone or in combination.
- it is a protic solvent, if it is a higher alcohol etc. which do not react with a compound (c), a compound (d), and a compound (1), it can be used.
- the ratio of the nonaqueous solvent to the compound (c) in the step (3) is not particularly limited.
- the volume ratio is preferably 100 times or less, more preferably 50 times or less, and further preferably 25 times or less.
- 1 time or more is preferable by volume ratio, 3 times or more is more preferable, and 5 times or more is still more preferable.
- Step (3) may be, for example, a method of dropping the compound (d) while stirring the solution of the compound (c), or a method of dropping the compound (c) into the solution of the compound (d).
- compound (c) or compound (d) may be diluted.
- the second production method may include a step of recovering the compound (1) obtained in the step (3) from the solvent after the step (3), and further a purification step such as pH adjustment and recrystallization. May be included.
- Compound (1) (excluding compound (1-1)) has the following general formula (e): (In the formula, Z 101 is fluorine, chlorine, bromine or iodine, and R 101 and R 102 are the same as described above) and water is reacted with the compound (e) represented by the following general formula (f): (Wherein R 101 and R 102 are the same as above), the step (4) for obtaining the compound (f), the compound (f) represented by the general formula (f) and a lithium source are reacted.
- a production method hereinafter also referred to as a third production method including the step (5) of obtaining the compound (1) represented by the general formula (1).
- R 101 and R 102 are the same as those in the first and second manufacturing methods described above.
- Z 101 is fluorine, chlorine, bromine or iodine, and is preferably chlorine.
- the step (4) can be performed, for example, by introducing water into the reaction vessel and adding the compound represented by the general formula (e) to the introduced water.
- the amount of water is not particularly limited, and it may be 1 equivalent or more in terms of molar ratio with respect to compound (e). Ice may be added to make ice water.
- the temperature in the step (4) is not limited as long as the reaction proceeds, but it is preferably carried out at 0 to 20 ° C., for example.
- the lithium source in the step (5) is preferably lithium hydroxide, lithium hydride or lithium metal, more preferably lithium hydroxide.
- the amount of the lithium source used in the step (5) is preferably 1.5 mol times or less, more preferably 1.2 mol times or less, still more preferably 1.1 mol times or less with respect to the compound (f). Although a minimum is not specifically limited, Usually, it is 0.50 mol times or more, 0.80 mol times or more are preferable and 1.0 mol times or more are more preferable.
- the temperature in a process (5) will not be limited if the said reaction advances, For example, 150 degrees C or less is preferable, 120 degrees C or less is more preferable, 90 degrees C or less is still more preferable. Further, it is preferably ⁇ 20 ° C. or higher, more preferably 0 ° C. or higher, and further preferably 20 ° C. or higher. If it is the said temperature, side reaction will not advance easily and reaction can be advanced efficiently.
- the reaction of step (5) can be performed in a solvent.
- a solvent in which the compound (f) and the lithium source are dissolved is preferable.
- the solubility of the compound (f) at room temperature is preferably 0.1% by mass or more, more preferably 1% by mass or more, and still more preferably 5% by mass or more.
- water or alcohols is preferable as the solvent, and a mixed solvent of water and alcohols may be used.
- a mixed solvent of water and alcohols may be used.
- said alcohol Methanol, ethanol, isopropyl alcohol, etc. are employable.
- a solution obtained by dissolving a lithium source in a solvent may be added to the compound (f) and stirred, or the compound (f) may be added to a lithium source dissolved in the solvent. good.
- Compound (f) may be used as it is or may be dissolved in an arbitrary solvent.
- the stirring time is not particularly limited, and is, for example, 0.1 to 24 hours.
- the third production method may include a step of recovering the compound (1) obtained in the step (5), and may further include a purification step such as pH adjustment and recrystallization.
- Compound (1-1), and compound (1) R 101 and R 102 of is perfluorinated (H of the substituents described as the R 101 and R 102 are all substituted into F)
- Compound ( 1-2) is, for example, the following general formula (g): (Wherein R 211 and R 212 are each independently -H, Formula: —O p101 — (SiR 103 2 O) n101 —SiR 104 3 (R 103 and R 104 are each independently an alkyl group in which one or more hydrogens may be substituted with fluorine, one or more An alkenyl group in which hydrogen may be substituted with fluorine, an alkynyl group in which one or more hydrogens may be substituted with fluorine, or an aryl group in which one or more hydrogens are substituted with fluorine, n101 is 0 A group represented by the following integer: p101 is 0 or 1.
- the above substituents may contain one or more divalent to hexavalent heteroatoms in their structure, and one or more hydrogens may be substituted with fluorine or a functional group having 0 to 7 carbon atoms.
- R 211 and R 212 has one or more hydrogen atoms.
- X 101 and —SO 3 X 102 include those similar to R 101 and R 102 in formula (1). However, at least one of R 211 and R 212 needs to have one or more hydrogen atoms.
- a solvent is introduced into a reaction vessel, a compound (g) and a lithium source are added to the introduced solvent, and a mixed gas containing fluorine of an arbitrary concentration is bubbled therein.
- a mixed gas containing fluorine of an arbitrary concentration is bubbled therein.
- the amount of water is not particularly limited, and it is preferably used in a mass ratio of 1.0 to 100 times with respect to the compound (g).
- the temperature in the step (6) is preferably 0 to 5 ° C. in order to suppress side reactions.
- the lithium source in the step (6) is preferably lithium hydroxide, lithium hydride or lithium metal, more preferably lithium hydroxide.
- the mixed gas containing fluorine in the step (6) can be used as a mixed gas in which fluorine and an inert gas are mixed at an arbitrary concentration.
- concentration of the fluorine gas is preferably 1.0 to 20% in terms of the volume ratio in the mixed gas from the viewpoint that the reaction can be easily controlled and the reaction can proceed efficiently.
- the inert gas a rare gas such as argon, nitrogen gas or the like can be used, and nitrogen gas is preferable.
- the amount of the lithium source used in the step (6) is preferably 1.5 mol times or less, more preferably 1.2 mol times or less, still more preferably 1.1 mol times or less with respect to the compound (g). Although a minimum is not specifically limited, Usually, it is 0.50 mol times or more, 0.80 mol times or more are preferable and 1.0 mol times or more are more preferable.
- the reaction of step (6) can be carried out in a solvent.
- a solvent in which the compound (g) and the lithium source are dissolved is preferable.
- the solubility of the compound (g) at room temperature is preferably 0.1% by mass or more, more preferably 1% by mass or more, and still more preferably 5% by mass or more.
- water or alcohols are preferable as the solvent, and water is more preferable.
- the reaction time in the step (6) is not particularly limited as long as the compound (g) is sufficiently fluorinated, but is preferably 0.1 to 72 hours, more preferably 0.1 to 24 hours, More preferred is 5 to 12 hours.
- the fourth production method may include a step of recovering the compound (1-1) or compound (1-2) obtained in the step (6), and further a purification step such as pH adjustment or recrystallization. May be included.
- a compound (1) may be used individually by 1 type, and may use 2 or more types together.
- the electrolytic solution of the present disclosure preferably contains 0.001 to 10% by mass of the compound (1) with respect to the electrolytic solution.
- content of the compound (1) is within the above range, the resistance of the electrochemical device can be further reduced, and the high-temperature storage characteristics can be further improved.
- content of a compound (1) 0.005 mass% or more is more preferable, 0.01 mass% or more is further more preferable, and 0.1 mass% or more is especially preferable.
- 7 mass% or less is more preferable, 5 mass% or less is still more preferable, and 3 mass% or less is especially preferable.
- the electrolytic solution of the present disclosure preferably includes a solvent.
- the solvent preferably contains at least one selected from the group consisting of carbonates and carboxylic acid esters.
- the carbonate may be a cyclic carbonate or a chain carbonate.
- the cyclic carbonate may be a non-fluorinated cyclic carbonate or a fluorinated cyclic carbonate.
- non-fluorinated cyclic carbonate examples include non-fluorinated saturated cyclic carbonates, preferably non-fluorinated saturated alkylene carbonates having an alkylene group having 2 to 6 carbon atoms, and non-fluorine having an alkylene group having 2 to 4 carbon atoms. Saturated alkylene carbonate is more preferred.
- non-fluorinated saturated cyclic carbonate ethylene carbonate, propylene carbonate, cis-2,3-pentylene carbonate, cis-2,3-butylene carbonate are preferable in that they have a high dielectric constant and suitable viscosity.
- 2,3-pentylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 1,2-butylene carbonate and at least one selected from the group consisting of butylene carbonate are preferred.
- the said non-fluorinated saturated cyclic carbonate may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the non-fluorinated saturated cyclic carbonate is preferably 5 to 90% by volume, more preferably 10 to 60% by volume with respect to the solvent.
- the content is preferably 15 to 45% by volume.
- the fluorinated cyclic carbonate is a cyclic carbonate having a fluorine atom.
- a solvent containing a fluorinated cyclic carbonate can be suitably used even under a high voltage.
- “high voltage” refers to a voltage of 4.2 V or higher.
- the upper limit of “high voltage” is preferably 4.9V.
- the fluorinated cyclic carbonate may be a fluorinated saturated cyclic carbonate or a fluorinated unsaturated cyclic carbonate.
- the fluorinated saturated cyclic carbonate is a saturated cyclic carbonate having a fluorine atom, specifically, the following general formula (A):
- X 1 to X 4 are the same or different and each represents —H, —CH 3 , —C 2 H 5 , —F, a fluorinated alkyl group optionally having an ether bond, or an ether bond.
- Examples of the fluorinated alkyl group include —CF 3 , —CF 2 H, —CH 2 F, and the like.
- the fluorinated saturated cyclic carbonate when the fluorinated saturated cyclic carbonate is included, when the electrolytic solution of the present disclosure is applied to a high voltage lithium ion secondary battery or the like, the oxidation resistance of the electrolytic solution is improved, and stable and excellent charge / discharge characteristics are obtained.
- the “ether bond” is a bond represented by —O—.
- one or two of X 1 to X 4 may have —F, a fluorinated alkyl group that may have an ether bond, or an ether bond.
- a fluorinated alkoxy group is preferred.
- X 1 to X 4 represent —H, —F, a fluorinated alkyl group (a), an ether bond, because a decrease in viscosity at a low temperature, an increase in flash point, and an improvement in solubility of the electrolyte salt can be expected.
- the fluorinated alkyl group (b) or the fluorinated alkoxy group (c) is preferable.
- the fluorinated alkyl group (a) is obtained by substituting at least one hydrogen atom of the alkyl group with a fluorine atom.
- the fluorinated alkyl group (a) preferably has 1 to 20 carbon atoms, more preferably 1 to 17 carbon atoms, still more preferably 1 to 7 carbon atoms, and particularly preferably 1 to 5 carbon atoms. If the carbon number is too large, the low-temperature characteristics may be lowered or the solubility of the electrolyte salt may be lowered. If the carbon number is too small, the solubility of the electrolyte salt is lowered, the discharge efficiency is lowered, and further, An increase in viscosity may be observed.
- those having 1 carbon include CFH 2 —, CF 2 H—, and CF 3 —.
- CF 2 H— or CF 3 — is preferable in terms of high temperature storage characteristics, and CF 3 — is most preferable.
- fluorinated alkyl groups those having 2 or more carbon atoms are represented by the following general formula (a-1): R 1 -R 2- (a-1) (Wherein R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom; R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom; provided that R 1 and A fluorinated alkyl group represented by (at least one of R 2 has a fluorine atom) can be preferably exemplified from the viewpoint of good solubility of the electrolyte salt. R 1 and R 2 may further have other atoms other than the carbon atom, the hydrogen atom, and the fluorine atom.
- R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom.
- R 1 is preferably a linear or branched alkyl group having 1 to 16 carbon atoms.
- the number of carbon atoms of R 1 is more preferably 1 to 6, and further preferably 1 to 3.
- R 1 specifically, as a linear or branched alkyl group, CH 3 —, CH 3 CH 2 —, CH 3 CH 2 CH 2 —, CH 3 CH 2 CH 2 CH 2 —,
- R 1 is a linear alkyl group having a fluorine atom, CF 3 —, CF 3 CH 2 —, CF 3 CF 2 —, CF 3 CH 2 CH 2 —, CF 3 CF 2 CH 2 — CF 3 CF 2 CF 2- , CF 3 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2 —, CF 3 CF 2 CF 2 CH 2 —, CF 3 CF 2 CH 2 CF 2 —, CF 3 CH 2 CH 2 CF 2 —, CF 3 CH 2 CH 2 CH 2 —, CF 3 CF 2 CH 2 CH 2 —, CF 3 CF 2 CH 2 CH 2 CH 2 —, CF 3 CF 2 CH 2 CH 2 —, CF 3 CF 2 CF 2 CH 2 CH 2 —,
- R 1 is a branched alkyl group having a fluorine atom
- Etc. are preferable. However, since the viscosity tends to increase when the branch has CH 3 -or CF 3- , the number is preferably small (one) or zero.
- R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom.
- R 2 may be linear or branched.
- An example of the minimum structural unit constituting such a linear or branched alkylene group is shown below.
- R 2 is composed of these alone or in combination.
- the base is composed of a constitutional unit that does not contain Cl, because de-HCl reaction with a base does not occur and is more stable.
- R 2 is linear, it is composed of only the above-mentioned linear minimum structural unit, and —CH 2 —, —CH 2 CH 2 — or —CF 2 — is particularly preferable. From the viewpoint of further improving the solubility of the electrolyte salt, —CH 2 — or —CH 2 CH 2 — is more preferable.
- R 2 When R 2 is branched, it comprises at least one of the aforementioned branched minimum structural units, and R 2 is represented by the general formula — (CX a X b ) — (X a is H, F CH 3 or CF 3 ; X b is CH 3 or CF 3, provided that when X b is CF 3 , X a is H or CH 3 .
- the solubility of the electrolyte salt can be further improved.
- Preferred fluorinated alkyl groups (a) include, for example, CF 3 CF 2 —, HCF 2 CF 2 —, H 2 CFCF 2 —, CH 3 CF 2 —, CF 3 CHF—, CH 3 CF 2 —, CF 3 CF 2 CF 2- , HCF 2 CF 2 CF 2- , H 2 CFCF 2 CF 2- , CH 3 CF 2 CF 2- ,
- the fluorinated alkyl group (b) having an ether bond is obtained by substituting at least one hydrogen atom of the alkyl group having an ether bond with a fluorine atom.
- the fluorinated alkyl group (b) having an ether bond preferably has 2 to 17 carbon atoms. If the number of carbon atoms is too large, the viscosity of the fluorinated saturated cyclic carbonate increases, and the fluorine-containing group increases, so that the solubility of the electrolyte salt decreases due to a decrease in the dielectric constant, and compatibility with other solvents. Decrease may be observed. From this viewpoint, the fluorinated alkyl group (b) having an ether bond preferably has 2 to 10 carbon atoms, and more preferably 2 to 7 carbon atoms.
- the alkylene group constituting the ether portion of the fluorinated alkyl group (b) having an ether bond may be a linear or branched alkylene group.
- An example of the minimum structural unit constituting such a linear or branched alkylene group is shown below.
- the alkylene group may be composed of these minimum structural units alone, and may be linear (i), branched (ii), or linear (i) and branched (ii). You may comprise by the combination. Preferred specific examples will be described later.
- the base is composed of a constitutional unit that does not contain Cl, because de-HCl reaction with a base does not occur and is more stable.
- R 3- OR 4 ) n1- (b-1) (Wherein R 3 may have a fluorine atom, preferably an alkyl group having 1 to 6 carbon atoms; R 4 may have a fluorine atom, preferably an alkylene having 1 to 4 carbon atoms) N1 is an integer of 1 to 3; provided that at least one of R 3 and R 4 has a fluorine atom).
- R 3 and R 4 include the following, and these can be combined as appropriate to form a fluorinated alkyl group (b) having an ether bond represented by the general formula (b-1). However, it is not limited to these.
- R 3 the general formula: X c 3 C— (R 5 ) n2 — (the three X c are the same or different and each is H or F; R 5 represents a fluorine atom having 1 to 5 carbon atoms)
- R 3 includes CH 3 —, CF 3 —, HCF 2 —, and H 2 CF—.
- R 3 is linear, CF 3 CH 2 —, CF 3 CF 2 —, CF 3 CH 2 CH 2 —, CF 3 CF 2 CH 2 —, CF 3 CF 2 CF 2 —, CF 3 CH 2 CF 2 —, CF 3 CH 2 CH 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 —, CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 CH 2 —, CF 3 CH 2 CF 2 CH 2 CH 2
- n2 is 1, and as R 3 is branched, the
- R 3 is more preferably linear.
- n1 is an integer of 1 to 3, preferably 1 or 2.
- R 4 may be the same or different.
- R 4 include the following linear or branched ones.
- the fluorinated alkoxy group (c) is obtained by substituting at least one hydrogen atom of the alkoxy group with a fluorine atom.
- the fluorinated alkoxy group (c) preferably has 1 to 17 carbon atoms. More preferably, it has 1 to 6 carbon atoms.
- the fluorinated alkoxy group (c) is represented by the general formula: X d 3 C— (R 6 ) n3 —O— (the three X d are the same or different, and all are H or F; R 6 is preferably carbon number)
- fluorinated alkoxy group (c) examples include a fluorinated alkoxy group in which an oxygen atom is bonded to the terminal of the alkyl group exemplified as R 1 in the general formula (a-1).
- the fluorine content of the fluorinated alkyl group (a), the fluorinated alkyl group (b) having an ether bond, and the fluorinated alkoxy group (c) in the fluorinated saturated cyclic carbonate is preferably 10% by mass or more. If the fluorine content is too low, the effect of lowering the viscosity at low temperatures and the effect of increasing the flash point may not be sufficiently obtained. From this viewpoint, the fluorine content is more preferably 12% by mass or more, and further preferably 15% by mass or more. The upper limit is usually 76% by mass.
- the fluorine content of the fluorinated alkyl group (a), the fluorinated alkyl group (b) having an ether bond, and the fluorinated alkoxy group (c) is determined based on ⁇ (number of fluorine atoms) based on the structural formula of each group. ⁇ 19) / Formula amount of each group ⁇ ⁇ 100 (%).
- the fluorine content of the entire fluorinated saturated cyclic carbonate is preferably 10% by mass or more, and more preferably 15% by mass or more.
- the upper limit is usually 76% by mass.
- the fluorine content of the fluorinated saturated cyclic carbonate is ⁇ (number of fluorine atoms ⁇ 19) / molecular weight of fluorinated saturated cyclic carbonate ⁇ ⁇ 100 (%) based on the structural formula of the fluorinated saturated cyclic carbonate. It is a calculated value.
- fluorinated saturated cyclic carbonate examples include the following.
- Etc. can also be used.
- fluorinated saturated cyclic carbonate in which at least one of X 1 to X 4 is a fluorinated alkyl group (a) and the rest are all —H are:
- fluorinated saturated cyclic carbonates in which at least one of X 1 to X 4 is a fluorinated alkyl group (b) having an ether bond or a fluorinated alkoxy group (c), and the rest are all —H as,
- the fluorinated saturated cyclic carbonate is preferably any of the following compounds.
- fluorinated saturated cyclic carbonate examples include trans-4,5-difluoro-1,3-dioxolan-2-one, 5- (1,1-difluoroethyl) -4,4-difluoro-1, 3-dioxolan-2-one, 4-methylene-1,3-dioxolan-2-one, 4-methyl-5-trifluoromethyl-1,3-dioxolan-2-one, 4-ethyl-5-fluoro- 1,3-dioxolan-2-one, 4-ethyl-5,5-difluoro-1,3-dioxolan-2-one, 4-ethyl-4,5-difluoro-1,3-dioxolan-2-one, 4-ethyl-4,5,5-trifluoro-1,3-dioxolan-2-one, 4,4-difluoro-5-methyl-1,3-dioxolan-2-one, 4-fluoro-5-methyl
- fluorinated saturated cyclic carbonate examples include fluoroethylene carbonate, difluoroethylene carbonate, trifluoromethyl ethylene carbonate (3,3,3-trifluoropropylene carbonate), 2,2,3,3,3-pentafluoro. More preferred is propyl ethylene carbonate.
- the fluorinated unsaturated cyclic carbonate is a cyclic carbonate having an unsaturated bond and a fluorine atom, and a fluorinated ethylene carbonate derivative substituted with a substituent having an aromatic ring or a carbon-carbon double bond is preferred.
- the said fluorinated cyclic carbonate may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the fluorinated cyclic carbonate is preferably 5 to 90% by volume, more preferably 10 to 60% by volume, and more preferably 15 to More preferably, it is 45 volume%.
- the chain carbonate may be a non-fluorinated chain carbonate or a fluorinated chain carbonate.
- non-fluorinated chain carbonate examples include CH 3 OCOOCH 3 (dimethyl carbonate: DMC), CH 3 CH 2 OCOOCH 2 CH 3 (diethyl carbonate: DEC), CH 3 CH 2 OCOOCH 3 (ethyl methyl carbonate: EMC).
- the said non-fluorinated chain carbonate may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and ratios.
- the content of the non-fluorinated chain carbonate is preferably 10 to 90% by volume, more preferably 40 to 85% by volume with respect to the solvent. It is preferably 50 to 80% by volume.
- the fluorinated chain carbonate is a chain carbonate having a fluorine atom.
- a solvent containing a fluorinated chain carbonate can be suitably used even under a high voltage.
- Rf 2 OCOOR 7 (B) (Wherein Rf 2 is a fluorinated alkyl group having 1 to 7 carbon atoms, and R 7 is an alkyl group optionally containing a fluorine atom having 1 to 7 carbon atoms). Can be mentioned.
- Rf 2 is a fluorinated alkyl group having 1 to 7 carbon atoms
- R 7 is an alkyl group that may contain a fluorine atom having 1 to 7 carbon atoms.
- the fluorinated alkyl group is obtained by substituting at least one hydrogen atom of the alkyl group with a fluorine atom.
- Rf 2 and R 7 preferably have 1 to 7 carbon atoms and more preferably 1 to 2 in terms of low viscosity. If the carbon number is too large, the low-temperature characteristics may be lowered or the solubility of the electrolyte salt may be lowered. If the carbon number is too small, the solubility of the electrolyte salt is lowered, the discharge efficiency is lowered, and further, An increase in viscosity may be observed.
- fluorinated alkyl group having 1 carbon atom examples include CFH 2 —, CF 2 H—, and CF 3 —.
- CFH 2 — or CF 3 — is preferable in terms of high temperature storage characteristics.
- Examples of the fluorinated alkyl group having 2 or more carbon atoms include the following general formula (d-1): R 1 -R 2- (d-1) (Wherein R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom; R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom; provided that R 1 and A fluorinated alkyl group represented by (at least one of R 2 has a fluorine atom) can be preferably exemplified from the viewpoint of good solubility of the electrolyte salt. R 1 and R 2 may further have other atoms other than the carbon atom, the hydrogen atom, and the fluorine atom.
- R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom.
- R 1 is preferably a linear or branched alkyl group having 1 to 6 carbon atoms.
- the carbon number of R 1 is more preferably 1 to 3.
- R 1 specifically, as a linear or branched alkyl group, CH 3 —, CF 3 —, CH 3 CH 2 —, CH 3 CH 2 CH 2 —, CH 3 CH 2 CH 2 CH 2- ,
- R 1 is a linear alkyl group having a fluorine atom, CF 3 —, CF 3 CH 2 —, CF 3 CF 2 —, CF 3 CH 2 CH 2 —, CF 3 CF 2 CH 2 — CF 3 CF 2 CF 2- , CF 3 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2 —, CF 3 CF 2 CF 2 CH 2 —, CF 3 CF 2 CH 2 CF 2 —, CF 3 CH 2 CH 2 CF 2 —, CF 3 CH 2 CH 2 CH 2 —, CF 3 CF 2 CH 2 CH 2 —, CF 3 CF 2 CH 2 CH 2 CH 2 —, CF 3 CF 2 CH 2 CH 2 —, CF 3 CF 2 CF 2 CH 2 CH 2 —,
- R 1 is a branched alkyl group having a fluorine atom
- Etc. are preferable. However, since the viscosity tends to increase when the branch has CH 3 -or CF 3- , the number is preferably small (one) or zero.
- R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom.
- R 2 may be linear or branched.
- An example of the minimum structural unit constituting such a linear or branched alkylene group is shown below.
- R 2 is composed of these alone or in combination.
- the base is composed of a constitutional unit that does not contain Cl, because de-HCl reaction with a base does not occur and is more stable.
- R 2 is linear, it is composed of only the above-mentioned linear minimum structural unit, and —CH 2 —, —CH 2 CH 2 — or —CF 2 — is particularly preferable. From the viewpoint of further improving the solubility of the electrolyte salt, —CH 2 — or —CH 2 CH 2 — is more preferable.
- R 2 When R 2 is branched, it comprises at least one of the aforementioned branched minimum structural units, and R 2 is represented by the general formula — (CX a X b ) — (X a is H, F CH 3 or CF 3 ; X b is CH 3 or CF 3, provided that when X b is CF 3 , X a is H or CH 3 .
- the solubility of the electrolyte salt can be further improved.
- fluorinated alkyl groups include, for example, CF 3 CF 2 —, HCF 2 CF 2 —, H 2 CFCF 2 —, CH 3 CF 2 —, CF 3 CH 2 —, CF 3 CF 2 CF 2- , HCF 2 CF 2 CF 2- , H 2 CFCF 2 CF 2- , CH 3 CF 2 CF 2- ,
- examples of the fluorinated alkyl group for Rf 2 and R 7 include CF 3 —, CF 3 CF 2 —, (CF 3 ) 2 CH—, CF 3 CH 2 —, C 2 F 5 CH 2 —, CF 3.
- CF 2 CH 2- , HCF 2 CF 2 CH 2- , CF 3 CFHCF 2 CH 2- , CFH 2- , CF 2 H- are preferred, because of high flame retardancy, good rate characteristics and oxidation resistance CF 3 CH 2 —, CF 3 CF 2 CH 2 —, HCF 2 CF 2 CH 2 —, CFH 2 —, CF 2 H— are more preferred.
- R 7 is an alkyl group containing no fluorine atom, it is an alkyl group having 1 to 7 carbon atoms.
- R 7 preferably has 1 to 4 carbon atoms and more preferably 1 to 3 in terms of low viscosity.
- alkyl group not containing a fluorine atom examples include CH 3 —, CH 3 CH 2 —, (CH 3 ) 2 CH—, C 3 H 7 — and the like. Of these, CH 3 — and CH 3 CH 2 — are preferred because of their low viscosity and good rate characteristics.
- the fluorinated chain carbonate preferably has a fluorine content of 15 to 70% by mass.
- the fluorine content is more preferably 20% by mass or more, further preferably 30% by mass or more, particularly preferably 35% by mass or more, more preferably 60% by mass or less, and still more preferably 50% by mass or less.
- the fluorine content is based on the structural formula of the fluorinated chain carbonate. ⁇ (Number of fluorine atoms ⁇ 19) / molecular weight of fluorinated chain carbonate ⁇ ⁇ 100 (%) The value calculated by
- the fluorinated chain carbonate is preferably one of the following compounds from the viewpoint of low viscosity.
- methyl 2,2,2-trifluoroethyl carbonate F 3 CH 2 COC ( ⁇ O) OCH 3 .
- the said fluorinated chain carbonate may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the fluorinated chain carbonate is preferably 10 to 90% by volume, more preferably 40 to 85% by volume with respect to the solvent, More preferably, it is 50 to 80% by volume.
- the carboxylic acid ester may be a cyclic carboxylic acid ester or a chain carboxylic acid ester.
- the cyclic carboxylic acid ester may be a non-fluorinated cyclic carboxylic acid ester or a fluorinated cyclic carboxylic acid ester.
- non-fluorinated cyclic carboxylic acid ester examples include non-fluorinated saturated cyclic carboxylic acid esters, and non-fluorinated saturated cyclic carboxylic acid esters having an alkylene group having 2 to 4 carbon atoms are preferable.
- non-fluorinated saturated cyclic carboxylic acid ester having an alkylene group having 2 to 4 carbon atoms include ⁇ -propiolactone, ⁇ -butyrolactone, ⁇ -caprolactone, ⁇ -valerolactone, ⁇ methyl- ⁇ - Examples include butyrolactone. Of these, ⁇ -butyrolactone and ⁇ -valerolactone are particularly preferable from the viewpoint of improving the degree of dissociation of lithium ions and improving load characteristics.
- the said non-fluorinated saturated cyclic carboxylic acid ester may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the non-fluorinated saturated cyclic carboxylic acid ester is preferably 0 to 90% by volume, preferably 0.001 to 90% by volume with respect to the solvent. %, More preferably 1 to 60% by volume, still more preferably 5 to 40% by volume.
- the chain carboxylic acid ester may be a non-fluorinated chain carboxylic acid ester or a fluorinated chain carboxylic acid ester.
- the said solvent contains the said chain
- non-fluorinated chain carboxylic acid ester examples include methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, tert-butylpropionate, tert -Butyl butyrate, sec-butyl propionate, sec-butyl butyrate, n-butyl butyrate, methyl pyrophosphate, ethyl pyrophosphate, tert-butyl formate, tert-butyl acetate, sec-butyl formate, sec -Butyl acetate, n-hexyl pivalate, n-propyl formate, n-propyl acetate, n-butyl formate, n-butyl pivalate, n-octyl pivalate, ethyl 2- (dimeth
- butyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate are preferable, and ethyl propionate and propyl propionate are particularly preferable.
- strand-shaped carboxylic acid ester may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the non-fluorinated chain carboxylic acid ester is preferably 0 to 90% by volume, preferably 0.001 to 90% by volume with respect to the solvent. %, More preferably 1 to 60% by volume, still more preferably 5 to 40% by volume.
- the fluorinated chain carboxylic acid ester is a chain carboxylic acid ester having a fluorine atom.
- a solvent containing a fluorinated chain carboxylic acid ester can be suitably used even under a high voltage.
- fluorinated chain carboxylic acid ester examples include the following general formula: R 31 COOR 32 (Wherein R 31 and R 32 are each independently an alkyl group optionally containing a fluorine atom having 1 to 4 carbon atoms, and at least one of R 31 and R 32 contains a fluorine atom).
- R 31 and R 32 are each independently an alkyl group optionally containing a fluorine atom having 1 to 4 carbon atoms, and at least one of R 31 and R 32 contains a fluorine atom.
- the fluorinated chain carboxylic acid ester shown is preferable from the viewpoint of good compatibility with other solvents and good oxidation resistance.
- R 31 and R 32 include a methyl group (—CH 3 ), an ethyl group (—CH 2 CH 3 ), a propyl group (—CH 2 CH 2 CH 3 ), and an isopropyl group (—CH (CH 3 ) 2 ).
- Non-fluorinated alkyl groups such as a normal butyl group (—CH 2 CH 2 CH 2 CH 3 ) and a tertiary butyl group (—C (CH 3 ) 3 ); —CF 3 , —CF 2 H, —CFH 2 , —CF 2 CF 3 , —CF 2 CF 2 H, —CF 2 CFH 2 , —CH 2 CF 3 , —CH 2 CF 2 H, —CH 2 CFH 2 , —CF 2 CF 2 CF 3 , —CF 2 CF 2 CF 2 H, —CF 2 CF 2 CFH 2 , —CH 2 CF 2 CF 3 , —CH 2 CF 2 CF 2 H, —CH 2 CF 2 CFH 2 , —CH 2 CH 2 CF 3 , —CH 2 CH 2 CF 2 H, CH 2 CH 2 CFH 2, -CF (CF 3) 2, -CF (CF 2 H) 2, -CF 3
- a methyl group, an ethyl group, —CF 3 , —CF 2 H, —CF 2 CF 3 , —CH 2 CF 3 , —CH 2 CF 2 H, —CH 2 CFH 2 , —CH 2 CH 2 CF 3 , —CH 2 CF 2 CF 3 , —CH 2 CF 2 CF 2 H, and —CH 2 CF 2 CFH 2 are particularly preferable from the viewpoint of good compatibility with other solvents, viscosity, and oxidation resistance.
- fluorinated chain carboxylic acid ester examples include, for example, CF 3 CH 2 C ( ⁇ O) OCH 3 (methyl 3,3,3-trifluoropropionate), HCF 2 C ( ⁇ O) OCH 3 ( Methyl difluoroacetate), HCF 2 C ( ⁇ O) OC 2 H 5 (ethyl difluoroacetate), CF 3 C ( ⁇ O) OCH 2 CH 2 CF 3 , CF 3 C ( ⁇ O) OCH 2 C 2 F 5 , CF 3 C ( ⁇ O) OCH 2 CF 2 CF 2 H (trifluoroacetic acid 2,2,3,3-tetrafluoropropyl), CF 3 C ( ⁇ O) OCH 2 CF 3 , CF 3 C ( ⁇ O) OCH (CF 3 ) 2 , ethyl pentafluorobutyrate, methyl pentafluoropropionate, ethyl pentafluoropropionate, methyl heptafluo
- strand-shaped carboxylic acid ester may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the fluorinated chain carboxylic acid ester is preferably 10 to 90% by volume, and preferably 40 to 85% by volume with respect to the solvent. Is more preferable, and 50 to 80% by volume is still more preferable.
- the solvent preferably contains at least one selected from the group consisting of the cyclic carbonate, the chain carbonate, and the chain carboxylic acid ester, and the cyclic carbonate, the chain carbonate, and the chain carboxylic acid. More preferably, it contains at least one selected from the group consisting of esters.
- the cyclic carbonate is preferably a saturated cyclic carbonate.
- the solvent contains the cyclic carbonate and at least one selected from the group consisting of the chain carbonate and the chain carboxylate ester, the cyclic carbonate, the chain carbonate, and the chain carboxylate ester It is preferable that the total of at least one selected from the group consisting of 10 to 100% by volume is included, more preferably 30 to 100% by volume, and still more preferably 50 to 100% by volume.
- the solvent contains the cyclic carbonate and at least one selected from the group consisting of the chain carbonate and the chain carboxylate ester, the cyclic carbonate, the chain carbonate, and the chain carboxylate ester
- the volume ratio with at least one selected from the group consisting of 5/95 to 95/5 is preferable, 10/90 or more is more preferable, 15/85 or more is further preferable, and 20/80 or more is particularly preferable. 90/10 or less is more preferable, 60/40 or less is further preferable, and 50/50 or less is particularly preferable.
- the solvent preferably also contains at least one selected from the group consisting of the non-fluorinated saturated cyclic carbonate, the non-fluorinated chain carbonate, and the non-fluorinated chain carboxylic acid ester. More preferably, it contains a fluorinated saturated cyclic carbonate and at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylic acid ester.
- the electrolytic solution containing the solvent having the above composition can be suitably used for an electrochemical device used at a relatively low voltage.
- the solvent includes the non-fluorinated saturated cyclic carbonate and at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylic acid ester
- the non-fluorinated saturated cyclic carbonate The total amount of carbonate and at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylic acid ester is preferably 5 to 100% by volume, and preferably 20 to 100% by volume. More preferably, it is more preferably 30 to 100% by volume.
- the electrolyte solution includes the non-fluorinated saturated cyclic carbonate and at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylate
- the non-fluorinated saturated The volume ratio between the cyclic carbonate and at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylic acid ester is preferably 5/95 to 95/5. 90 or more is more preferable, 15/85 or more is further preferable, 20/80 or more is particularly preferable, 90/10 or less is more preferable, 60/40 or less is further preferable, and 50/50 or less is particularly preferable.
- the solvent preferably also contains at least one selected from the group consisting of the fluorinated saturated cyclic carbonate, the fluorinated chain carbonate, and the fluorinated chain carboxylic acid ester. And at least one selected from the group consisting of the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester.
- the electrolytic solution containing the solvent having the above composition can be suitably used not only for an electrochemical device used at a relatively low voltage but also for an electrochemical device used at a relatively high voltage.
- the solvent contains the fluorinated saturated cyclic carbonate and at least one selected from the group consisting of the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester, the fluorinated saturated cyclic carbonate
- the total content of the fluorinated chain carbonate and at least one selected from the group consisting of the fluorinated chain carboxylic acid esters is preferably 5 to 100% by volume, more preferably 10 to 100% by volume, More preferably, it is contained in an amount of 30 to 100% by volume.
- the volume ratio of the fluorinated chain carbonate and at least one selected from the group consisting of the fluorinated chain carboxylic acid esters is preferably 5/95 to 95/5, more preferably 10/90 or more, and 15 / 85 or more is more preferable, 20/80 or more is particularly preferable, 90/10 or less is more preferable, 60/40 or less is further preferable, and 50/50 or less is particularly preferable.
- an ionic liquid can also be used as the solvent.
- An “ionic liquid” is a liquid composed of ions obtained by combining an organic cation and an anion.
- the organic cation is not particularly limited, and examples thereof include imidazolium ions such as dialkylimidazolium cation and trialkylimidazolium cation; tetraalkylammonium ion; alkylpyridinium ion; dialkylpyrrolidinium ion; and dialkylpiperidinium ion. .
- the anion serving as a counter for these organic cations is not particularly limited.
- the solvent is preferably a non-aqueous solvent
- the electrolytic solution of the present disclosure is preferably a non-aqueous electrolytic solution.
- the content of the solvent is preferably 70 to 99.999% by mass in the electrolytic solution, more preferably 80% by mass or more, and more preferably 92% by mass or less.
- the electrolytic solution of the present disclosure may further include a compound (5) represented by the general formula (5).
- a a + is a metal ion, hydrogen ion or onium ion
- a is an integer of 1 to 3
- b is an integer of 1 to 3
- p is b / a
- n203 is an integer of 1 to 4
- n201 is 0 to 8 integer
- n202 is 0 or 1
- Z 201 is a transition metal, III of the periodic table, IV or group V element of.
- X 201 represents O, S, an alkylene group having 1 to 10 carbon atoms, a halogenated alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 20 carbon atoms, or a halogenated arylene group having 6 to 20 carbon atoms (alkylene group).
- a halogenated alkylene group, an arylene group, and a halogenated arylene group may have a substituent or a hetero atom in the structure.
- n202 is 1 and n203 is 2 to 4, n203 X 201 are Each may be bonded).
- L 201 is a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a halogenated aryl group having 6 to 20 carbon atoms
- the alkylene group, halogenated alkylene group, arylene group, and halogenated arylene group may have a substituent or a hetero atom in the structure.
- n201 is 2 to 8
- each of the n201 L 201 is They may combine to form a ring) or —Z 203 Y 203 .
- Y 201 , Y 202 and Z 203 are each independently O, S, NY 204 , a hydrocarbon group or a fluorinated hydrocarbon group.
- Y 203 and Y 204 are each independently H, F, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a halogen having 6 to 20 carbon atoms.
- Aryl group (an alkyl group, a halogenated alkyl group, an aryl group and a halogenated aryl group may have a substituent or a hetero atom in the structure thereof, and when there are a plurality of Y 203 or Y 204, May combine to form a ring).
- a a + includes lithium ion, sodium ion, potassium ion, magnesium ion, calcium ion, barium ion, cesium ion, silver ion, zinc ion, copper ion, cobalt ion, iron ion, nickel ion, manganese ion, titanium ion, Lead ion, chromium ion, vanadium ion, ruthenium ion, yttrium ion, lanthanoid ion, actinoid ion, tetrabutylammonium ion, tetraethylammonium ion, tetramethylammonium ion, triethylmethylammonium ion, triethylammonium ion, pyridinium ion, imidazolium ion , Hydrogen ion, tetraethylphosphonium ion, tetramethylphosphonium
- a a + is preferably a lithium ion, sodium ion, magnesium ion, tetraalkylammonium ion, or hydrogen ion, and particularly preferably a lithium ion.
- the valence a of the cation of A a + is an integer of 1 to 3. If it is larger than 3, the crystal lattice energy becomes large, which causes a problem that it becomes difficult to dissolve in a solvent. Therefore, when solubility is required, 1 is more preferable.
- the valence b of the anion is an integer of 1 to 3, and 1 is particularly preferable.
- the constant p representing the ratio of cation to anion is inevitably determined by the valence ratio b / a of both.
- the ligand part of the general formula (5) will be described.
- bonded with Z201 in General formula (5) is called a ligand.
- Z 201 is preferably Al, B, V, Ti, Si, Zr, Ge, Sn, Cu, Y, Zn, Ga, Nb, Ta, Bi, P, As, Sc, Hf or Sb. More preferably, B or P.
- X 201 represents O, S, an alkylene group having 1 to 10 carbon atoms, a halogenated alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 20 carbon atoms, or a halogenated arylene group having 6 to 20 carbon atoms.
- alkylene groups and arylene groups may have a substituent or a hetero atom in the structure.
- a halogen atom in place of hydrogen on the alkylene group and arylene group, a halogen atom, a chain or cyclic alkyl group, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, a sulfonyl group, an amino group, a cyano group, a carbonyl group It may have a group, an acyl group, an amide group, or a hydroxyl group as a substituent, or may have a structure in which nitrogen, sulfur, or oxygen is introduced instead of carbon on alkylene and arylene.
- n202 is 1 and n203 is 2 to 4
- n203 X 201 's may be bonded to each other. Examples thereof include a ligand such as ethylenediaminetetraacetic acid.
- L 201 represents a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, a halogenated aryl group having 6 to 20 carbon atoms, or -Z 203 Y 203 (Z 203 and Y 203 will be described later).
- Is an alkyl group and the aryl group herein, similarly to the X 201, substituent in the structure may have a hetero atom
- n201 is n201 amino L 201 when the 2-8 bound respectively May form a ring.
- L 201 is preferably a fluorine atom or a cyano group.
- Y 201 , Y 202 and Z 203 each independently represent O, S, NY 204 , a hydrocarbon group or a fluorinated hydrocarbon group.
- Y 201 and Y 202 are preferably O, S, or NY 204 , and more preferably O.
- these ligands constitute a chelate structure with Z 201 . Due to the effect of this chelate, the heat resistance, chemical stability, and hydrolysis resistance of this compound are improved.
- the constant n202 in this ligand is 0 or 1.
- the fluorinated hydrocarbon group is a group in which at least one hydrogen atom of the hydrocarbon group is substituted with a fluorine atom.
- Y 203 and Y 204 are each independently H, F, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms. It is a halogenated aryl group, and these alkyl group and aryl group may have a substituent or a hetero atom in the structure, and when a plurality of Y 203 or Y 204 are present, they are bonded to each other. To form a ring.
- the constant n203 related to the number of ligands described above is an integer of 1 to 4, preferably 1 or 2, and more preferably 2.
- the constant n201 related to the number of ligands described above is an integer of 0 to 8, preferably an integer of 0 to 4, more preferably 0, 2 or 4. Further, n201 is preferably 2 when n203 is 1, and n201 is preferably 0 when n203 is 2.
- the alkyl group, halogenated alkyl group, aryl group, and halogenated aryl group include those having other functional groups such as a branch, a hydroxyl group, and an ether bond.
- Examples of the compound (5) include lithium oxalatoborate salts, which have the following formula: Lithium bis (oxalato) borate (LIBOB) represented by the following formula: Lithium difluorooxalatoborate (LIDFOB) represented by
- Lithium difluorooxalatophosphanite represented by the following formula: Lithium tetrafluorooxalatophosphanite (LITFOP) represented by the following formula: And lithium bis (oxalato) difluorophosphanite represented by
- dicarboxylic acid complex salt whose complex central element is boron include lithium bis (malonato) borate, lithium difluoro (malonato) borate, lithium bis (methylmalonate) borate, lithium difluoro (methylmalonato) borate, lithium bis ( Examples thereof include dimethylmalonato) borate and lithium difluoro (dimethylmalonato) borate.
- dicarboxylic acid complex salt in which the complex element is phosphorus examples include lithium tris (oxalato) phosphate, lithium tris (malonato) phosphate, lithium difluorobis (malonato) phosphate, lithium tetrafluoro (malonato) phosphate, lithium tris ( Methyl malonate) phosphate, lithium difluorobis (methylmalonate) phosphate, lithium tetrafluoro (methylmalonate) phosphate, lithium tris (dimethylmalonate) phosphate, lithium difluorobis (dimethylmalonate) phosphate, lithium tetrafluoro (dimethylmalonate) phosphate, etc. Can be mentioned.
- dicarboxylic acid complex salt whose complex central element is aluminum examples include LiAl (C 2 O 4 ) 2 and LiAlF 2 (C 2 O 4 ).
- lithium bis (oxalato) borate lithium difluoro (oxalato) borate, lithium tris (oxalato) phosphate, lithium difluorobis (oxalato) phosphate, lithium tetrafluoro (oxalato) phosphate are easily available and have a stable film structure It is more preferably used because it can contribute to the formation of an object.
- lithium bis (oxalato) borate is particularly preferable.
- the content of the compound (5) is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and more preferably 10% by mass with respect to the solvent, because further excellent cycle characteristics can be obtained. % Or less is preferable, and 3% by mass or less is more preferable.
- the electrolytic solution of the present disclosure preferably further contains an electrolyte salt (excluding compounds (1) and (5)).
- an electrolyte salt excluding compounds (1) and (5).
- electrolyte salt in addition to lithium salt, ammonium salt, metal salt, liquid salt (ionic liquid), inorganic polymer type salt, organic polymer type salt, etc. can be used for electrolyte solution. Any thing can be used.
- a lithium salt is preferable.
- Arbitrary things can be used as said lithium salt, Specifically, the following are mentioned.
- Inorganic lithium salts such as LiPO 2 F 2 ; Lithium tungstates such as LiWOF 5 ; HCO 2 Li, CH 3 CO 2 Li, CH 2 FCO 2 Li, CHF 2 CO 2 Li, CF 3 CO 2 Li, CF 3 CH 2 CO 2 Li, CF 3 CF 2 CO 2 Li, CF 3 CF 2 CF 2 Carboxylic acid lithium salts such as CO 2 Li, CF 3 CF 2 CF 2 CO 2 Li; FSO 3 Li, CH 3 SO 3 Li, CH 2 F
- LiPF 6 , LiBF 4 , LiSbF 6 , LiTaF 6 , LiPO 2 F 2 , FSO 3 Li, CF 3 SO 3 Li, LiN (FSO 2 ) 2 , LiN (FSO 2 ) (CF 3 SO 2 ), LiN ( CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 , lithium cyclic 1,2-perfluoroethanedisulfonylimide, lithium cyclic 1,3-perfluoropropane disulfonylimide, LiC (FSO 2 ) 3 , LiC (CF 3 SO 2 ) 3 , LiC (C 2 F 5 SO 2 ) 3 , LiBF 3 CF 3 , LiBF 3 C 2 F 5 , LiPF 3 (CF 3 ) 3 , LiPF 3 (C 2 F 5 ) 3 are particularly preferable because they have the effect of improving output characteristics, high-rate charge / discharge characteristics, high-temperature storage characteristics, cycle characteristics, and the
- electrolyte salts may be used alone or in combination of two or more.
- a preferable example in the case of using two or more kinds in combination is the combined use of LiPF 6 and LiBF 4 , or the combined use of LiPF 6 and LiPO 2 F 2 , C 2 H 5 OSO 3 Li or FSO 3 Li, and high temperature storage characteristics. This has the effect of improving load characteristics and cycle characteristics.
- the amount of LiBF 4 , LiPO 2 F 2 , C 2 H 5 OSO 3 Li or FSO 3 Li based on 100% by mass of the entire electrolyte there is no limitation on the amount of LiBF 4 , LiPO 2 F 2 , C 2 H 5 OSO 3 Li or FSO 3 Li based on 100% by mass of the entire electrolyte, and it is optional as long as the effect of the present disclosure is not significantly impaired.
- the amount of the electrolyte of the present disclosure is usually 0.01% by mass or more, preferably 0.1% by mass or more, and usually 30% by mass or less, preferably 20% by mass or less, more preferably 10% by mass. % Or less, more preferably 5% by mass or less.
- Another example is the combined use of an inorganic lithium salt and an organic lithium salt, and the combined use of both has the effect of suppressing deterioration due to high-temperature storage.
- the organic lithium salt CF 3 SO 3 Li, LiN (FSO 2 ) 2 , LiN (FSO 2 ) (CF 3 SO 2 ), LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 , Lithium cyclic 1,2-perfluoroethanedisulfonylimide, lithium cyclic 1,3-perfluoropropane disulfonylimide, LiC (FSO 2 ) 3 , LiC (CF 3 SO 2 ) 3 , LiC (C 2 F 5 SO 2 ) 3 , LiBF 3 CF 3 , LiBF 3 C 2 F 5 , LiPF 3 (CF 3 ) 3 , LiPF 3 (C 2 F 5 ) 3 and the like are preferable.
- the concentration of these electrolyte salts in the electrolytic solution is not particularly limited as long as the effects of the present disclosure are not impaired.
- the total molar concentration of lithium in the electrolytic solution is preferably 0.3 mol / L or more, more preferably 0.4 mol / L.
- it is 0.5 mol / L or more, Preferably it is 3 mol / L or less, More preferably, it is 2.5 mol / L or less, More preferably, it is 2.0 mol / L or less.
- the electrical conductivity of the electrolyte may be insufficient.
- the concentration is too high, the electrical conductivity may decrease due to an increase in viscosity, resulting in decreased battery performance. There is a case.
- an ammonium salt is preferable.
- the ammonium salt include the following (IIa) to (IIe).
- R 1a , R 2a , R 3a and R 4a are the same or different, and any of them may contain an ether bond having 1 to 6 carbon atoms; X ⁇ is an anion)
- the tetraalkyl quaternary ammonium salt shown by these can be illustrated preferably.
- the ammonium salt in which part or all of the hydrogen atoms are substituted with a fluorine atom and / or a fluorine-containing alkyl group having 1 to 4 carbon atoms is preferable from the viewpoint of improving oxidation resistance.
- R 5a is an alkyl group having 1 to 6 carbon atoms; R 6a is a divalent hydrocarbon group having 1 to 6 carbon atoms; R 7a is an alkyl group having 1 to 4 carbon atoms; z is 1 or 2; X - is an anion)
- the alkyl ether group containing trialkylammonium salt etc. which are shown by these are mentioned. By introducing an alkyl ether group, the viscosity can be lowered.
- the anion X ⁇ may be an inorganic anion or an organic anion.
- inorganic anions include AlCl 4 ⁇ , BF 4 ⁇ , PF 6 ⁇ , AsF 6 ⁇ , TaF 6 ⁇ , I ⁇ and SbF 6 ⁇ .
- organic anions include bisoxalatoborate anion, difluorooxalatoborate anion, tetrafluorooxalatophosphate anion, difluorobisoxalatophosphate anion, CF 3 COO ⁇ , CF 3 SO 3 ⁇ , (CF 3 SO 2 ) 2 N ⁇ , (C 2 F 5 SO 2 ) 2 N — and the like.
- BF 4 ⁇ , PF 6 ⁇ , AsF 6 ⁇ and SbF 6 ⁇ are preferred from the viewpoint of good oxidation resistance and ion dissociation properties.
- tetraalkyl quaternary ammonium salt examples include Et 4 NBF 4 , Et 4 NClO 4 , Et 4 NPF 6 , Et 4 NAsF 6 , Et 4 NSbF 6 , Et 4 NCF 3 SO 3 , Et 4 N CF 3 SO 2) 2 N, Et 4 NC 4 F 9 SO 3, Et 3 MeNBF 4, Et 3 MeNClO 4, Et 3 MeNPF 6, Et 3 MeNAsF 6, Et 3 MeNSbF 6, Et 3 MeNCF 3 SO 3, Et 3 MeN (CF 3 SO 2) 2 N, may be used Et 3 MeNC 4 F 9 SO 3 , in particular, Et 4 NBF 4, Et 4 NPF 6, Et 4 NSbF 6, Et 4 NAsF 6, Et 3 MeNBF 4 N, N-diethyl-N-methyl-N- (2-methoxyethyl) ammonium salt, etc. It is done.
- R 8a and R 9a are the same or different, and both are alkyl groups having 1 to 4 carbon atoms; X ⁇ is an anion; n1 is an integer of 0 to 5; n2 is an integer of 0 to 5) Spirocyclic bipyrrolidinium salt represented by the general formula (IIb-2):
- R 10a and R 11a are the same or different, and both are alkyl groups having 1 to 4 carbon atoms; X ⁇ is an anion; n3 is an integer of 0 to 5; n4 is an integer of 0 to 5) Or a spirocyclic bipyrrolidinium salt represented by the general formula (IIb-3):
- R 12a and R 13a are the same or different, and both are alkyl groups having 1 to 4 carbon atoms; X ⁇ is an anion; n5 is an integer of 0 to 5; n6 is an integer of 0 to 5)
- a spiro ring bipyrrolidinium salt represented by the formula is preferred.
- the spiro-ring bipyrrolidinium salt in which part or all of the hydrogen atoms are substituted with a fluorine atom and / or a fluorine-containing alkyl group having 1 to 4 carbon atoms is preferable from the viewpoint of improving oxidation resistance.
- Anion X - of the preferred embodiment are the same as for (IIa). Among them, high dissociative, terms the internal resistance is low under a high voltage, BF 4 -, PF 6 - , (CF 3 SO 2) 2 N- or (C 2 F 5 SO 2) 2 N- is preferable.
- spiro ring bipyrrolidinium salt examples include, for example, Etc.
- This spiro ring bipyrrolidinium salt is excellent in terms of solubility in a solvent, oxidation resistance, and ionic conductivity.
- R 14a and R 15a are the same or different, and both are alkyl groups having 1 to 6 carbon atoms; X ⁇ represents an anion)
- the imidazolium salt shown by can be illustrated preferably.
- the imidazolium salt in which part or all of the hydrogen atoms are substituted with a fluorine atom and / or a fluorine-containing alkyl group having 1 to 4 carbon atoms is preferable from the viewpoint of improving oxidation resistance.
- This imidazolium salt is excellent in terms of low viscosity and good solubility.
- N-alkylpyridinium salts represented by the formula are preferred.
- the N-alkylpyridinium salt in which part or all of the hydrogen atoms are substituted with a fluorine atom and / or a fluorine-containing alkyl group having 1 to 4 carbon atoms is preferable from the viewpoint of improving oxidation resistance.
- This N-alkylpyridinium salt is excellent in that it has low viscosity and good solubility.
- N, N-dialkylpyrrolidinium salt represented by the formula is preferably exemplified. Further, the oxidation resistance of the N, N-dialkylpyrrolidinium salt in which part or all of the hydrogen atoms are substituted with fluorine atoms and / or fluorine-containing alkyl groups having 1 to 4 carbon atoms is improved. It is preferable from the point.
- This N, N-dialkylpyrrolidinium salt is excellent in that it has low viscosity and good solubility.
- ammonium salts (IIa), (IIb) and (IIc) are preferable in terms of good solubility, oxidation resistance and ionic conductivity,
- lithium salt as electrolyte salt for electrical double layer capacitors.
- the lithium salt LiPF 6, LiBF 4, LiN (FSO 2) 2, LiAsF 6, LiSbF 6, LiN (SO 2 C 2 H 5) 2 is preferred.
- a magnesium salt may be used.
- the magnesium salt for example, Mg (ClO 4 ) 2 , Mg (OOC 2 H 5 ) 2 and the like are preferable.
- the concentration is preferably 0.7 mol / liter or more. If it is less than 0.7 mol / liter, not only the low-temperature characteristics are deteriorated, but also the initial internal resistance may be increased.
- the concentration of the electrolyte salt is more preferably 0.9 mol / liter or more.
- the upper limit of the concentration is preferably 2.0 mol / liter or less, more preferably 1.5 mol / liter or less, from the viewpoint of low temperature characteristics.
- the ammonium salt is triethylmethylammonium tetrafluoroborate (TEMAF 4 )
- the concentration is preferably 0.7 to 1.5 mol / liter from the viewpoint of excellent low temperature characteristics.
- SBPBF 4 spirobipyrrolidinium tetrafluoroborate
- the electrolytic solution of the present disclosure has the general formula (2): Wherein X 21 is a group containing at least H or C, n21 is an integer of 1 to 3, Y 21 and Z 21 are the same or different, and a group containing at least H, C, O or F, and n22 is 0 Or 1, Y 21 and Z 21 may be bonded to each other to form a ring.
- the electrolytic solution contains the compound (2), even when stored at a high temperature, the capacity retention rate is less likely to decrease, and the amount of gas generated is less likely to increase.
- n21 is 2 or 3
- two or three X 21 may be different even in the same.
- the plurality of Y 21 and Z 21 may be the same or different.
- Y 21 includes H-, F-, CH 3- , CH 3 CH 2- , CH 3 CH 2 CH 2- , CF 3- , CF 3 CF 2- , CH 2 FCH 2 -and CF 3 CF 2 CF At least one selected from the group consisting of 2 ⁇ is preferred.
- Z 21 includes H-, F-, CH 3- , CH 3 CH 2- , CH 3 CH 2 CH 2- , CF 3- , CF 3 CF 2- , CH 2 FCH 2 -and CF 3 CF 2 CF At least one selected from the group consisting of 2 ⁇ is preferred.
- Y 21 and Z 21 may be bonded to each other to form a carbocyclic or heterocyclic ring that may include an unsaturated bond and may have aromaticity.
- the ring has preferably 3 to 20 carbon atoms.
- analogue refers to an acid anhydride obtained by substituting a part of the structure of the illustrated acid anhydride with another structure without departing from the spirit of the present disclosure.
- Examples include those having different sites for binding to anhydrides.
- acid anhydrides forming a 5-membered ring structure include succinic anhydride, methyl succinic anhydride (4-methyl succinic anhydride), dimethyl succinic anhydride (4,4-dimethyl succinic anhydride).
- acid anhydrides forming a 6-membered ring structure include cyclohexanedicarboxylic acid anhydride (cyclohexane-1,2-dicarboxylic acid anhydride, etc.), 4-cyclohexene-1,2-dicarboxylic acid anhydride, Examples thereof include glutaric anhydride, glutaconic anhydride, 2-phenylglutaric anhydride, and analogs thereof.
- acid anhydrides forming other cyclic structures include 5-norbornene-2,3-dicarboxylic acid anhydride, cyclopentanetetracarboxylic dianhydride, pyromellitic acid anhydride, diglycolic acid anhydride Etc., and their analogs.
- acid anhydrides that form a cyclic structure and are substituted with a halogen atom include monofluorosuccinic anhydrides (such as 4-fluorosuccinic anhydride), 4,4-difluorosuccinic anhydrides, 4 , 5-Difluorosuccinic anhydride, 4,4,5-trifluorosuccinic anhydride, trifluoromethyl succinic anhydride, tetrafluorosuccinic anhydride (4,4,5,5-tetrafluorosuccinic anhydride ), 4-fluoromaleic anhydride, 4,5-difluoromaleic anhydride, trifluoromethylmaleic anhydride, 5-fluoroitaconic anhydride, 5,5-difluoroitaconic anhydride, and the like And the like.
- monofluorosuccinic anhydrides such as 4-fluorosuccinic anhydride
- 4,4-difluorosuccinic anhydrides 4 , 5-D
- Examples of the compound (2) include glutaric anhydride, citraconic anhydride, glutaconic anhydride, itaconic anhydride, diglycolic anhydride, cyclohexanedicarboxylic anhydride, cyclopentanetetracarboxylic dianhydride, 4-cyclohexene- 1,2-dicarboxylic acid anhydride, 3,4,5,6-tetrahydrophthalic acid anhydride, 5-norbornene-2,3-dicarboxylic acid anhydride, phenylsuccinic acid anhydride, 2-phenylglutaric acid anhydride, Maleic anhydride, methyl maleic anhydride, trifluoromethyl maleic anhydride, phenyl maleic anhydride, succinic anhydride, methyl succinic anhydride, dimethyl succinic anhydride, trifluoromethyl succinic anhydride, monofluoro succinic acid Acid anhydride, tetrafluorosuccinic
- maleic anhydride Methyl maleic anhydride, trifluoromethyl maleic anhydride, succinic anhydride, methyl succinic anhydride, trifluoromethyl succinic anhydride, and tetrafluoro succinic anhydride are more preferable, and maleic anhydride and succinic anhydride are further included. preferable.
- Compound (2) has the general formula (3):
- X 41 and X 42 are the same or different and are at least one selected from the group consisting of the compound (4) represented by the group containing at least H, C, O or F). .
- X 31 to X 34 are the same or different and are preferably at least one selected from the group consisting of an alkyl group, a fluorinated alkyl group, an alkenyl group, and a fluorinated alkenyl group.
- X 31 to X 34 preferably have 1 to 10 carbon atoms, and more preferably 1 to 3 carbon atoms.
- X 31 to X 34 may be the same or different, and H—, F—, CH 3 —, CH 3 CH 2 —, CH 3 CH 2 CH 2 —, CF 3 —, CF 3 CF 2 —, CH 2 FCH 2 - and CF 3 CF 2 CF 2 - at least one member selected from the group consisting of is more preferable.
- X 41 and X 42 are the same or different and are preferably at least one selected from the group consisting of an alkyl group, a fluorinated alkyl group, an alkenyl group, and a fluorinated alkenyl group.
- X 41 and X 42 preferably have 1 to 10 carbon atoms, and more preferably 1 to 3 carbon atoms.
- X 41 and X 42 are the same or different and are H-, F-, CH 3- , CH 3 CH 2- , CH 3 CH 2 CH 2- , CF 3- , CF 3 CF 2- , CH 2 FCH. 2 - and CF 3 CF 2 CF 2 - at least one member selected from the group consisting of is more preferable.
- the compound (3) is preferably any one of the following compounds.
- the compound (4) is preferably any of the following compounds.
- the compound ( 2) is preferably included.
- the content of the compound (2) is more preferably 0.01 to 10% by mass, further preferably 0.1 to 3% by mass, and particularly preferably 0.1 to 1.0% by mass.
- the electrolytic solution contains both of the compounds (3) and (4), even when stored at a high temperature, the capacity retention rate is more unlikely to decrease, and the amount of gas generated is less likely to increase.
- it contains 0.08 to 2.50 mass% of the compound (3) and 0.02 to 1.50 mass% of the compound (4), and 0.80 to 2.50 mass% with respect to the electrolytic solution. It is more preferable that the composition contains 3% by mass of the compound (3) and 0.08 to 1.50% by mass of the compound (4).
- the electrolytic solution of the present disclosure may include at least one selected from the group consisting of nitrile compounds represented by the following general formulas (1a), (1b), and (1c).
- R a and R b are each independently a hydrogen atom, a cyano group (CN), a halogen atom, an alkyl group, or a group in which at least a part of the hydrogen atoms of the alkyl group is substituted with a halogen atom).
- N represents an integer of 1 to 10.
- R c represents a hydrogen atom, a halogen atom, an alkyl group, a group in which at least a part of hydrogen atoms in the alkyl group is substituted with a halogen atom, or NC—R c1 —X c1 — (R c1 represents an alkylene group) , X c1 represents an oxygen atom or a sulfur atom.
- R d and R e each independently represent at least a part of a hydrogen atom, a halogen atom, an alkyl group, or an alkyl group.
- R f , R g , R h and R i are each independently at least one of a group containing a cyano group (CN), a hydrogen atom (H), a halogen atom, an alkyl group, or an alkyl group).
- the said nitrile compound may be used independently and may use 2 or more types together by arbitrary combinations and a ratio.
- R a and R b each independently represent a hydrogen atom, a cyano group (CN), a halogen atom, an alkyl group, or at least a part of the alkyl group as a halogen atom.
- a substituted group As a halogen atom, a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom are mentioned, for example. Of these, a fluorine atom is preferred.
- the alkyl group is preferably an alkyl group having 1 to 5 carbon atoms.
- alkyl group examples include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group and the like.
- group obtained by substituting at least a part of hydrogen atoms of the alkyl group with a halogen atom examples include groups obtained by substituting at least a part of the hydrogen atoms of the alkyl group with the halogen atoms described above.
- R a and R b are an alkyl group or a group in which at least a part of hydrogen atoms of the alkyl group is substituted with a halogen atom
- R a and R b are bonded to each other to form a ring structure (for example, a cyclohexane ring). ) May be formed.
- R a and R b are preferably a hydrogen atom or an alkyl group.
- n is an integer of 1 to 10.
- n is 2 or more, all n Ra may be the same, or at least a part thereof may be different. The same applies to Rb .
- n is preferably an integer of 1 to 7, and more preferably an integer of 2 to 5.
- dinitrile and tricarbonitrile are preferable.
- dinitriles include malononitrile, succinonitrile, glutaronitrile, adiponitrile, pimonitrile, suberonitrile, azeronitrile, sebacononitrile, undecandinitrile, dodecandinitrile, methylmalononitrile, ethylmalononitrile, isopropylmalononitrile, tert-butyl.
- succinonitrile glutaronitrile, and adiponitrile are particularly preferable.
- tricarbonitrile include pentanetricarbonitrile, propanetricarbonitrile, 1,3,5-hexanetricarbonitrile, 1,3,6-hexanetricarbonitrile, heptanetricarbonitrile, 1, 2,3-propanetricarbonitrile, 1,3,5-pentanetricarbonitrile, cyclohexanetricarbonitrile, triscyanoethylamine, triscyanoethoxypropane, tricyanoethylene, tris (2-cyanoethyl) amine, etc.
- Preferred are 1,3,6-hexanetricarbonitrile and cyclohexanetricarbonitrile, and most preferred is cyclohexanetricarbonitrile.
- R c represents a hydrogen atom, a halogen atom, an alkyl group, a group in which at least a part of hydrogen atoms in the alkyl group is substituted with a halogen atom, or NC—R c1 —X c1 — (R c1 represents an alkylene group, and Xc1 represents an oxygen atom or a sulfur atom.)
- R d and R e are each independently a hydrogen atom, a halogen atom, an alkyl group, or an alkyl group. In which at least some of the hydrogen atoms are substituted with halogen atoms.
- halogen atom examples include those exemplified for the general formula (1a).
- the NC-R c1 -X c1 - in R c1 is an alkylene group.
- the alkylene group an alkylene group having 1 to 3 carbon atoms is preferable.
- R c , R d, and R e are preferably each independently a hydrogen atom, a halogen atom, an alkyl group, or a group obtained by substituting at least a part of hydrogen atoms of an alkyl group with a halogen atom.
- At least one of R c , R d, and R e is preferably a halogen atom or a group obtained by substituting at least a part of hydrogen atoms of an alkyl group with a halogen atom, and includes at least a fluorine atom or an alkyl group. A group in which some hydrogen atoms are substituted with fluorine atoms is more preferable.
- R d and R e are an alkyl group or a group obtained by substituting at least a part of hydrogen atoms of an alkyl group with a halogen atom, R d and R e are bonded to each other to form a ring structure (for example, a cyclohexane ring). ) May be formed.
- m is an integer of 1 to 10.
- all m R d s may be the same, or at least some of them may be different.
- m is preferably an integer of 2 to 7, and more preferably an integer of 2 to 5.
- nitrile compound represented by the general formula (1b) examples include acetonitrile, propionitrile, butyronitrile, isobutyronitrile, valeronitrile, isovaleronitrile, lauronitrile, 3-methoxypropionitrile, 2-methylbutyro Nitrile, trimethylacetonitrile, hexanenitrile, cyclopentanecarbonitrile, cyclohexanecarbonitrile, fluoroacetonitrile, difluoroacetonitrile, trifluoroacetonitrile, 2-fluoropropionitrile, 3-fluoropropionitrile, 2,2-difluoropropionitrile, 2,3-difluoropropionitrile, 3,3-difluoropropionitrile, 2,2,3-trifluoropropionitrile, 3,3,3-trifluoropropionitrile, 3 3'-oxy dipropionate nitrile, 3,3' thiodipropionitrile,
- R f , R g , R h, and R i are each independently at least a group containing a cyano group (CN), a hydrogen atom, a halogen atom, an alkyl group, or an alkyl group. This is a group in which some hydrogen atoms are substituted with halogen atoms. Examples of the halogen atom, the alkyl group, and the group in which at least a part of the hydrogen atoms of the alkyl group are substituted with a halogen atom include those exemplified for the general formula (1a).
- Examples of the group containing a cyano group include a group obtained by substituting at least a part of hydrogen atoms of an alkyl group with a cyano group, in addition to a cyano group.
- Examples of the alkyl group in this case include those exemplified for the general formula (1a).
- At least one of R f , R g , R h and R i is a group containing a cyano group.
- at least two of R f , R g , R h and R i are groups containing a cyano group, and more preferably R h and R i are groups containing a cyano group.
- R f and R g are preferably hydrogen atoms.
- l is an integer of 1 to 3.
- l R f s may all be the same or at least partially different.
- R g is preferably an integer of 1 to 2.
- Examples of the nitrile compound represented by the general formula (1c) include 3-hexenedinitrile, mucononitrile, maleonitrile, fumaronitrile, acrylonitrile, methacrylonitrile, crotononitrile, 3-methylcrotononitrile, 2-methyl-2- Examples include butenenitrile, 2-pentenenitrile, 2-methyl-2-pentenenitrile, 3-methyl-2-pentenenitrile, 2-hexenenitrile, and the like. 3-hexenedinitrile and mucononitrile are preferable, and 3-hexenediene is particularly preferable. Nitriles are preferred.
- the content of the nitrile compound is preferably 0.2 to 7% by mass with respect to the electrolytic solution. Thereby, the high temperature storage characteristic and safety
- the lower limit of the total content of the nitrile compounds is more preferably 0.3% by mass, still more preferably 0.5% by mass.
- the upper limit is more preferably 5% by mass, further preferably 2% by mass, and particularly preferably 0.5% by mass.
- the electrolytic solution of the present disclosure may include a compound having an isocyanato group (hereinafter sometimes abbreviated as “isocyanate”).
- isocyanate is not particularly limited, and any isocyanate can be used. Examples of the isocyanate include monoisocyanates, diisocyanates, and triisocyanates.
- monoisocyanates include isocyanatomethane, isocyanatoethane, 1-isocyanatopropane, 1-isocyanatobutane, 1-isocyanatopentane, 1-isocyanatohexane, 1-isocyanatoheptane, 1-isocyanate.
- diisocyanates include 1,4-diisocyanatobutane, 1,5-diisocyanatopentane, 1,6-diisocyanatohexane, 1,7-diisocyanatoheptane, 1,8-diisocyanate.
- 1,6-diisocyanatohexane, 1,3-bis (isocyanatomethyl) cyclohexane, 1,3,5-tris (6-isocyanatohex-1-yl) -1,3,5-triazine 2,4,6 (1H, 3H, 5H) -trione, 2,4,4-trimethylhexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate are industrially easily available It is preferable in that the production cost of the electrolytic solution can be kept low, and it can contribute to the formation of a stable film-like structure from the technical point of view, and is more preferably used.
- the content of the isocyanate is not particularly limited, and is arbitrary as long as the effect of the present disclosure is not significantly impaired, but is preferably 0.001% by mass or more and 1.0% by mass or less with respect to the electrolytic solution.
- the isocyanate content is not less than this lower limit, a sufficient effect of improving cycle characteristics can be provided to the non-aqueous electrolyte secondary battery. Moreover, the initial resistance increase of a non-aqueous electrolyte secondary battery can be avoided as it is below this upper limit.
- the content of isocyanate is more preferably 0.01% by mass or more, further preferably 0.1% by mass or more, particularly preferably 0.2% by mass or more, and more preferably 0.8% by mass or less, still more preferably. Is 0.7% by mass or less, particularly preferably 0.6% by mass or less.
- the electrolytic solution of the present disclosure may include a cyclic sulfonate ester. It does not specifically limit as cyclic sulfonate ester, Arbitrary cyclic sulfonate esters can be used. Examples of cyclic sulfonic acid esters include saturated cyclic sulfonic acid esters, unsaturated cyclic sulfonic acid esters, saturated cyclic disulfonic acid esters, unsaturated cyclic disulfonic acid esters, and the like.
- saturated cyclic sulfonate ester examples include 1,3-propane sultone, 1-fluoro-1,3-propane sultone, 2-fluoro-1,3-propane sultone, and 3-fluoro-1,3-propane sultone.
- unsaturated cyclic sulfonate ester examples include 1-propene-1,3-sultone, 2-propene-1,3-sultone, 1-fluoro-1-propene-1,3-sultone, 2-fluoro- 1-propene-1,3-sultone, 3-fluoro-1-propene-1,3-sultone, 1-fluoro-2-propene-1,3-sultone, 2-fluoro-2-propene-1,3- Sultone, 3-fluoro-2-propene-1,3-sultone, 1-methyl-1-propene-1,3-sultone, 2-methyl-1-propene-1,3-sultone, 3-methyl-1- Propene-1,3-sultone, 1-methyl-2-propene-1,3-sultone, 2-methyl-2-propene-1,3-sultone, 3-methyl-2-propene-1,3-sultone, 1-butene-1, -Sultone, 2-butene-1,4-
- 1,3-propane sultone, 1-fluoro-1,3-propane sultone, 2-fluoro-1,3-propane sultone, 3-fluoro-1,3-propane sultone, 1-propene-1,3- Sultone is more preferably used because it can be easily obtained and can contribute to the formation of a stable film-like structure.
- the content of the cyclic sulfonic acid ester is not particularly limited, and is arbitrary as long as the effect of the present disclosure is not significantly impaired, but is preferably 0.001% by mass or more and 3.0% by mass or less with respect to the electrolytic solution. is there.
- the content of the cyclic sulfonic acid ester is more preferably 0.01% by mass or more, still more preferably 0.1% by mass or more, particularly preferably 0.2% by mass or more, and more preferably 2.5% by mass or less. More preferably, it is 2.0 mass% or less, Most preferably, it is 1.8 mass% or less.
- the electrolytic solution of the present disclosure may further contain polyethylene oxide having a weight average molecular weight of 2000 to 4000 and having —OH, —OCOOH, or —COOH at the terminal.
- polyethylene oxide having a weight average molecular weight of 2000 to 4000 and having —OH, —OCOOH, or —COOH at the terminal.
- the stability of the electrode interface is improved and the characteristics of the electrochemical device can be improved.
- the polyethylene oxide include polyethylene oxide monool, polyethylene oxide carboxylic acid, polyethylene oxide diol, polyethylene oxide dicarboxylic acid, polyethylene oxide triol, and polyethylene oxide tricarboxylic acid. These may be used alone or in combination of two or more. Of these, a mixture of polyethylene oxide monool and polyethylene oxide diol, and a mixture of polyethylene carboxylic acid and polyethylene dicarboxylic acid are preferable in that the characteristics of the electrochemical device become better.
- the weight average molecular weight of the polyethylene oxide is too small, it may be easily oxidized and decomposed.
- the weight average molecular weight is more preferably 3000 to 4000.
- the said weight average molecular weight can be measured by polystyrene conversion by a gel permeation chromatography (GPC) method.
- the polyethylene oxide content is preferably 1 ⁇ 10 ⁇ 6 to 1 ⁇ 10 ⁇ 2 mol / kg in the electrolytic solution. When there is too much content of the said polyethylene oxide, there exists a possibility of impairing the characteristic of an electrochemical device.
- the polyethylene oxide content is more preferably 5 ⁇ 10 ⁇ 6 mol / kg or more.
- the electrolytic solution of the present disclosure may further contain, as an additive, a fluorinated saturated cyclic carbonate, an unsaturated cyclic carbonate, an overcharge inhibitor, other known auxiliary agents, and the like. Thereby, the fall of the characteristic of an electrochemical device can be suppressed.
- fluorinated saturated cyclic carbonate examples include the compounds represented by the general formula (A) described above. Among them, fluoroethylene carbonate, difluoroethylene carbonate, monofluoromethylethylene carbonate, trifluoromethylethylene carbonate, 2,2,3,3,3-pentafluoropropylethylene carbonate (4- (2,2,3,3,3 3-pentafluoro-propyl)-[1,3] dioxolan-2-one) is preferred.
- a fluorinated saturated cyclic carbonate may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the fluorinated saturated cyclic carbonate is preferably 0.001 to 10% by mass, more preferably 0.01 to 5% by mass, and more preferably 0.1 to 3% by mass with respect to the electrolytic solution. More preferably, it is mass%.
- unsaturated cyclic carbonates examples include vinylene carbonates, aromatic carbonates, ethylene carbonates substituted with a substituent having a carbon-carbon double bond or carbon-carbon triple bond, phenyl carbonates, vinyl carbonates, allyl carbonates, Catechol carbonates etc. are mentioned.
- the vinylene carbonates include vinylene carbonate, methyl vinylene carbonate, 4,5-dimethyl vinylene carbonate, phenyl vinylene carbonate, 4,5-diphenyl vinylene carbonate, vinyl vinylene carbonate, 4,5-divinyl vinylene carbonate, allyl vinylene carbonate, 4 , 5-diallyl vinylene carbonate, 4-fluoro vinylene carbonate, 4-fluoro-5-methyl vinylene carbonate, 4-fluoro-5-phenyl vinylene carbonate, 4-fluoro-5-vinyl vinylene carbonate, 4-allyl-5-fluoro Vinylene carbonate, ethynyl ethylene carbonate, propargyl ethylene carbonate, methyl vinylene carbonate, dimethyl vinylene carbonate, etc. It is below.
- ethylene carbonates substituted with an aromatic ring or a substituent having a carbon-carbon double bond or carbon-carbon triple bond include vinyl ethylene carbonate, 4,5-divinylethylene carbonate, 4-methyl-5- Vinyl ethylene carbonate, 4-allyl-5-vinyl ethylene carbonate, ethynyl ethylene carbonate, 4,5-diethynyl ethylene carbonate, 4-methyl-5-ethynyl ethylene carbonate, 4-vinyl-5-ethynyl ethylene carbonate, 4-allyl -5-ethynylethylene carbonate, phenylethylene carbonate, 4,5-diphenylethylene carbonate, 4-phenyl-5-vinylethylene carbonate, 4-allyl-5-phenylethylene carbonate, allylethylene carbonate 4,5-diallylethylene carbonate, 4-methyl-5-allylethylene carbonate, 4-methylene-1,3-dioxolan-2-one, 4,5-dimethylene-1,3-dioxolan-2-one,
- vinylene carbonate, vinyl ethylene carbonate, and ethynyl ethylene carbonate are particularly preferable because they form a more stable interface protective film
- the molecular weight of the unsaturated cyclic carbonate is not particularly limited, and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the molecular weight is preferably 50 or more and 250 or less. If it is this range, it will be easy to ensure the solubility of the unsaturated cyclic carbonate with respect to electrolyte solution, and the effect of this indication will fully be expressed easily.
- the molecular weight of the unsaturated cyclic carbonate is more preferably 80 or more, and more preferably 150 or less.
- the production method of the unsaturated cyclic carbonate is not particularly limited, and can be produced by arbitrarily selecting a known method.
- An unsaturated cyclic carbonate may be used individually by 1 type, or may use 2 or more types together by arbitrary combinations and a ratio.
- the content of the unsaturated cyclic carbonate is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the content of the unsaturated cyclic carbonate is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and still more preferably 0.1% by mass or more in 100% by mass of the electrolytic solution.
- the content is preferably 5% by mass or less, more preferably 4% by mass or less, and still more preferably 3% by mass or less. If it is within the above range, the electrochemical device using the electrolytic solution is likely to exhibit a sufficient cycle characteristic improving effect, the high-temperature storage characteristic is lowered, the amount of gas generation is increased, and the discharge capacity maintenance ratio is lowered. It is easy to avoid such a situation.
- the unsaturated cyclic carbonate in addition to the non-fluorinated unsaturated cyclic carbonate as described above, a fluorinated unsaturated cyclic carbonate can also be suitably used.
- the fluorinated unsaturated cyclic carbonate is a cyclic carbonate having an unsaturated bond and a fluorine atom.
- the number of fluorine atoms contained in the fluorinated unsaturated cyclic carbonate is not particularly limited as long as it is 1 or more. Among them, the number of fluorine atoms is usually 6 or less, preferably 4 or less, and most preferably 1 or 2 fluorine atoms.
- fluorinated unsaturated cyclic carbonate examples include a fluorinated vinylene carbonate derivative, a fluorinated ethylene carbonate derivative substituted with an aromatic ring or a substituent having a carbon-carbon double bond.
- Fluorinated vinylene carbonate derivatives include 4-fluoro vinylene carbonate, 4-fluoro-5-methyl vinylene carbonate, 4-fluoro-5-phenyl vinylene carbonate, 4-allyl-5-fluoro vinylene carbonate, 4-fluoro-5- And vinyl vinylene carbonate.
- fluorinated ethylene carbonate derivative substituted with a substituent having an aromatic ring or a carbon-carbon double bond examples include 4-fluoro-4-vinylethylene carbonate, 4-fluoro-4-allylethylene carbonate, 4-fluoro-5 -Vinylethylene carbonate, 4-fluoro-5-allylethylene carbonate, 4,4-difluoro-4-vinylethylene carbonate, 4,4-difluoro-4-allylethylene carbonate, 4,5-difluoro-4-vinylethylene carbonate 4,5-difluoro-4-allylethylene carbonate, 4-fluoro-4,5-divinylethylene carbonate, 4-fluoro-4,5-diallylethylene carbonate, 4,5-difluoro-4,5-divinylethylene carbonate , 4,5-diflu B-4,5-diallylethylene carbonate, 4-fluoro-4-phenylethylene carbonate, 4-fluoro-5-phenylethylene carbonate, 4,4-difluoro-5-phenyl
- fluorinated unsaturated cyclic carbonate 4-fluorovinylene carbonate, 4-fluoro-5-methylvinylene carbonate, 4-fluoro-5-vinylvinylene carbonate, 4-allyl-5-fluorovinylene carbonate, 4- Fluoro-4-vinylethylene carbonate, 4-fluoro-4-allylethylene carbonate, 4-fluoro-5-vinylethylene carbonate, 4-fluoro-5-allylethylene carbonate, 4,4-difluoro-4-vinylethylene carbonate, 4,4-difluoro-4-allylethylene carbonate, 4,5-difluoro-4-vinylethylene carbonate, 4,5-difluoro-4-allylethylene carbonate, 4-fluoro-4,5-divinylethylene carbonate, -Fluoro-4,5-diallylethylene carbonate, 4,5-difluoro-4,5-divinylethylene carbonate, 4,5-difluoro-4,5-diallylethylene carbonate
- the molecular weight of the fluorinated unsaturated cyclic carbonate is not particularly limited, and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the molecular weight is preferably 50 or more and 500 or less. If it is this range, it will be easy to ensure the solubility of the fluorinated unsaturated cyclic carbonate with respect to electrolyte solution.
- the production method of the fluorinated unsaturated cyclic carbonate is not particularly limited, and can be produced by arbitrarily selecting a known method.
- the molecular weight is more preferably 100 or more, and more preferably 200 or less.
- a fluorinated unsaturated cyclic carbonate may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio. Further, the content of the fluorinated unsaturated cyclic carbonate is not particularly limited, and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the content of the fluorinated unsaturated cyclic carbonate is usually 100% by mass of the electrolytic solution, preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and further preferably 0.1% by mass or more. Moreover, it is preferably 5% by mass or less, more preferably 4% by mass or less, and still more preferably 3% by mass or less. Within this range, the electrochemical device using the electrolytic solution is likely to exhibit a sufficient cycle characteristic improvement effect, and the high-temperature storage characteristic is reduced, the amount of gas generated is increased, and the discharge capacity maintenance rate is reduced. It is easy to avoid such a situation.
- the electrolytic solution of the present disclosure may include a compound having a triple bond.
- the type is not particularly limited as long as it is a compound having one or more triple bonds in the molecule.
- Specific examples of the compound having a triple bond include the following compounds. 1-pentyne, 2-pentyne, 1-hexyne, 2-hexyne, 3-hexyne, 1-heptin, 2-heptin, 3-heptin, 1-octyne, 2-octyne, 3-octyne, 4-octyne, 1-pentyne Nonin, 2-nonine, 3-nonine, 4-nonine, 1-dodecin, 2-dodecin, 3-dodecin, 4-dodecin, 5-dodecin, phenylacetylene, 1-phenyl-1-propyne, 1-phenyl-2 -Propyne, 1-phenyl-1-butyne, 4-phenyl-1-butyne, 4-
- 2-butyne-1,4-diol dimethyl dicarbonate 2-butyne-1,4-diol diethyl dicarbonate, 2-butyne-1,4-diol di B pills dicarbonate, 2-butyne-1,4-diol dibutyl carbonate, 2-butyne-1,4-diol diphenyl carbonate, dicarbonate such as 2-butyne-1,4-diol and dicyclohexyl carbonate;
- Phosphoric acid (methyl) (2-propenyl) (2-propynyl), phosphoric acid (ethyl) (2-propenyl) (2-propynyl), phosphoric acid (2-butenyl) (methyl) (2-propynyl), phosphoric acid (2-butenyl) (ethyl) (2-propynyl), phosphoric acid (1,1-dimethyl-2-propynyl) (methyl) (2-propenyl), phosphoric acid (1,1-dimethyl-2-propynyl) ( Ethyl) (2-propenyl), phosphoric acid (2-butenyl) (1,1-dimethyl-2-propynyl) (methyl), and phosphoric acid (2-butenyl) (ethyl) (1,1-dimethyl-2- Phosphate esters such as propynyl);
- a compound having an alkynyloxy group is preferable because it forms a negative electrode film more stably in the electrolytic solution.
- 2- Compounds such as propynyl and di-2-propynyl oxalate are particularly preferred from the viewpoint of improving storage characteristics.
- the said compound which has a triple bond may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- the compounding amount of the compound having a triple bond with respect to the entire electrolytic solution of the present disclosure, and it is optional as long as the effect of the present disclosure is not significantly impaired.
- an overcharge inhibitor can be used in order to effectively suppress rupture / ignition of the battery when an electrochemical device using the electrolytic solution is in an overcharged state or the like.
- Partial hydride cyclohexylbenzene, t-butylbenzene, t-amylbenzene, diphenyl ether, dibenzofuran, diphenylcyclohexane, 1,1,3-trimethyl-3-phenylindane, cyclopentylbenzene, cyclohexylbenzene, cumene, 1,3- Aromatic compounds such as diisopropylbenzene, 1,4-diisopropylbenzene, t-butylbenzene, t-amylbenzene, t-hexylbenzene, anisole; 2-fluor
- cyclohexylbenzene and t-butylbenzene or t-amylbenzene biphenyl, alkylbiphenyl, terphenyl, partially hydrogenated terphenyl, cyclohexylbenzene, t-butylbenzene,
- aromatic compounds not containing oxygen such as t-amylbenzene
- oxygen-containing aromatic compounds such as diphenyl ether, dibenzofuran, etc.
- Carboxylic anhydride (excluding compound (2)) may be used for the electrolytic solution used in the present disclosure.
- a compound represented by the following general formula (6) is preferred.
- the method for producing the carboxylic acid anhydride is not particularly limited, and any known method can be selected and produced.
- R 61 and R 62 each independently represents a hydrocarbon group having 1 to 15 carbon atoms, which may have a substituent.
- R 61 and R 62 is not particularly limited as long as it is a monovalent hydrocarbon group.
- it may be an aliphatic hydrocarbon group or an aromatic hydrocarbon group, or a combination of an aliphatic hydrocarbon group and an aromatic hydrocarbon group.
- the aliphatic hydrocarbon group may be a saturated hydrocarbon group and may contain an unsaturated bond (carbon-carbon double bond or carbon-carbon triple bond).
- the aliphatic hydrocarbon group may be a chain or a ring, and in the case of a chain, it may be a straight chain or a branched chain. Further, a chain and a ring may be combined.
- R 61 and R 62 may be the same as or different from each other.
- the type of the substituent is not particularly limited unless it is contrary to the gist of the present disclosure, but examples include a fluorine atom, a chlorine atom, a bromine atom. And a halogen atom such as an iodine atom, preferably a fluorine atom.
- examples of the substituent other than the rogen atom include a substituent having a functional group such as an ester group, a cyano group, a carbonyl group, and an ether group, and a cyano group and a carbonyl group are preferable.
- the hydrocarbon group of R 61 and R 62 may have only one of these substituents, or may have two or more. In the case of having two or more substituents, these substituents may be the same or different from each other.
- the carbon number of each hydrocarbon group of R 61 and R 62 is usually 1 or more, and usually 15 or less, preferably 12 or less, more preferably 10 or less, and still more preferably 9 or less.
- the carbon number of the divalent hydrocarbon group is usually 1 or more, and usually 15 or less, preferably 13 or less, more preferably 10 or less, and still more preferably 8 or less.
- R 61, R 62 has a substituent containing carbon atoms, it is preferred that R 61, including the substituents thereof, R 62 total carbon atoms satisfies the above range.
- anhydride refers to an acid anhydride obtained by substituting a part of the structure of the illustrated acid anhydride with another structure without departing from the spirit of the present disclosure.
- acid anhydrides in which R 61 and R 62 are chain alkyl groups include acetic anhydride, propionic anhydride, butanoic anhydride, 2-methylpropionic anhydride, 2,2-dimethylpropionic anhydride.
- R 61 and R 62 are cyclic alkyl groups
- acid anhydrides in which R 61 and R 62 are cyclic alkyl groups include cyclopropanecarboxylic acid anhydride, cyclopentanecarboxylic acid anhydride, cyclohexanecarboxylic acid anhydride, and the like, and analogs thereof. .
- acid anhydrides in which R 61 and R 62 are alkenyl groups include acrylic acid anhydride, 2-methylacrylic acid anhydride, 3-methylacrylic acid anhydride, 2,3-dimethylacrylic acid anhydride, 3,3-dimethylacrylic anhydride, 2,3,3-trimethylacrylic anhydride, 2-phenylacrylic anhydride, 3-phenylacrylic anhydride, 2,3-diphenylacrylic anhydride, 3, 3-diphenylacrylic anhydride, 3-butenoic anhydride, 2-methyl-3-butenoic anhydride, 2,2-dimethyl-3-butenoic anhydride, 3-methyl-3-tenic anhydride, 2-methyl-3-methyl-3-butenoic anhydride, 2,2-dimethyl-3-methyl-3-butenoic anhydride, 3-pentenoic anhydride, 4-pentenoic anhydride, 2-cyclopentenecarboxylic acid Acid anhydride , 3-cyclopentene carboxylic acid anhydride,
- acid anhydrides in which R 61 and R 62 are alkynyl groups include propionic acid anhydride, 3-phenylpropionic acid anhydride, 2-butyric acid anhydride, 2-pentynic acid anhydride, and 3-butyric acid.
- acid anhydrides in which R 61 and R 62 are aryl groups include benzoic anhydride, 4-methylbenzoic anhydride, 4-ethylbenzoic anhydride, 4-tert-butylbenzoic anhydride, Examples thereof include 2-methylbenzoic anhydride, 2,4,6-trimethylbenzoic anhydride, 1-naphthalenecarboxylic anhydride, 2-naphthalenecarboxylic anhydride, and the like.
- Examples of acid anhydrides in which R 61 and R 62 are substituted with halogen atoms include the following examples of acid anhydrides mainly substituted with fluorine atoms. Some or all of these fluorine atoms are Acid anhydrides obtained by substitution with chlorine atoms, bromine atoms, and iodine atoms are also included in the exemplified compounds.
- Examples of acid anhydrides in which R 61 and R 62 are chain alkyl groups substituted with halogen atoms include fluoroacetic anhydride, difluoroacetic anhydride, trifluoroacetic anhydride, 2-fluoropropionic anhydride, 2,2-difluoropropionic anhydride, 2,3-difluoropropionic anhydride, 2,2,3-trifluoropropionic anhydride, 2,3,3-trifluoropropionic anhydride, 2,2, 3,3-tetrapropionic anhydride, 2,3,3,3-tetrapropionic anhydride, 3-fluoropropionic anhydride, 3,3-difluoropropionic anhydride, 3,3,3-trifluoro Examples include propionic acid anhydrides, perfluoropropionic acid anhydrides, and analogs thereof.
- Examples of acid anhydrides in which R 61 and R 62 are cyclic alkyl groups substituted with a halogen atom include 2-fluorocyclopentanecarboxylic acid anhydride, 3-fluorocyclopentanecarboxylic acid anhydride, 4-fluorocyclopentane Examples thereof include carboxylic acid anhydrides and the like and analogs thereof.
- Examples of acid anhydrides in which R 61 and R 62 are alkenyl groups substituted with halogen atoms include 2-fluoroacrylic anhydride, 3-fluoroacrylic anhydride, 2,3-difluoroacrylic anhydride, 3,3-difluoroacrylic anhydride, 2,3,3-trifluoroacrylic anhydride, 2- (trifluoromethyl) acrylic anhydride, 3- (trifluoromethyl) acrylic anhydride, 2,3 -Bis (trifluoromethyl) acrylic anhydride, 2,3,3-tris (trifluoromethyl) acrylic anhydride, 2- (4-fluorophenyl) acrylic anhydride, 3- (4-fluorophenyl) Acrylic anhydride, 2,3-bis (4-fluorophenyl) acrylic anhydride, 3,3-bis (4-fluorophenyl) acrylic anhydride, 2-fluoro 3-butenoic anhydride, 2,2-difluoro-3-butenoic anhydride, 3-fluor
- Examples of acid anhydrides in which R 61 and R 62 are alkynyl groups substituted with halogen atoms include 3-fluoro-2-propionic acid anhydride, 3- (4-fluorophenyl) -2-propionic acid anhydride 3- (2,3,4,5,6-pentafluorophenyl) -2-propionic anhydride, 4-fluoro-2-butynoic anhydride, 4,4-difluoro-2-butynoic anhydride, Examples include 4,4,4-trifluoro-2-butynoic anhydride and the like, and analogs thereof.
- Examples of acid anhydrides in which R 61 and R 62 are aryl groups substituted with halogen atoms include 4-fluorobenzoic anhydride, 2,3,4,5,6-pentafluorobenzoic anhydride, 4 -Trifluoromethylbenzoic anhydride, etc., and analogs thereof.
- Examples of acid anhydrides in which R 61 and R 62 have a substituent having a functional group such as ester, nitrile, ketone and ether include methoxyformic anhydride, ethoxyformic anhydride, methyl oxalic anhydride, Ethyl oxalic anhydride, 2-cyanoacetic anhydride, 2-oxopropionic anhydride, 3-oxobutanoic anhydride, 4-acetylbenzoic anhydride, methoxyacetic anhydride, 4-methoxybenzoic anhydride, etc. And analogs thereof.
- R 61 and R 62 include the examples given above and all combinations of analogs thereof. Typical examples are given below.
- Examples of combinations of chain alkyl groups include acetic acid propionic acid anhydride, acetic acid butanoic acid anhydride, butanoic acid propionic acid anhydride, acetic acid 2-methylpropionic acid anhydride, and the like.
- Examples of combinations of chain alkyl groups and cyclic alkyl groups include acetic acid cyclopentanoic acid anhydride, acetic acid cyclohexane acid anhydride, cyclopentanoic acid propionic acid anhydride, and the like.
- Examples of combinations of chain alkyl groups and alkenyl groups include acetic acid anhydride, acetic acid 3-methylacrylic acid anhydride, acetic acid 3-butenoic acid anhydride, acrylic acid propionic acid anhydride, and the like.
- Examples of combinations of chain alkyl groups and alkynyl groups include propionic acid acetate, acetic acid 2-butynoic acid anhydride, acetic acid 3-butynic acid anhydride, acetic acid 3-phenylpropionic acid anhydride propionic acid propionic acid anhydride Etc.
- Examples of combinations of chain alkyl groups and aryl groups include acetic acid benzoic anhydride, 4-methylbenzoic anhydride, 1-naphthalenecarboxylic anhydride, benzoic propionic anhydride, and the like.
- Examples of combinations of a chain alkyl group and a hydrocarbon group having a functional group include: acetic acid fluoroacetic anhydride, acetic acid trifluoroacetic acid anhydride, acetic acid 4-fluorobenzoic acid anhydride, fluoroacetic acid propionic acid anhydride, alkyl acetate Examples thereof include oxalic acid anhydride, acetic acid 2-cyanoacetic acid anhydride, acetic acid 2-oxopropionic acid anhydride, acetic acid methoxyacetic acid anhydride, methoxyacetic acid propionic acid anhydride, and the like.
- Examples of combinations of cyclic alkyl groups include cyclopentanoic acid cyclohexane anhydride.
- Examples of combinations of cyclic alkyl groups and alkenyl groups include acrylic acid cyclopentanoic acid anhydride, 3-methylacrylic acid cyclopentanoic acid anhydride, 3-butenoic acid cyclopentanoic acid anhydride, acrylic acid cyclohexane acid anhydride, etc. Can be mentioned.
- Examples of the combination of a cyclic alkyl group and an alkynyl group include propionic acid cyclopentanoic acid anhydride, 2-butyric acid cyclopentanoic acid anhydride, propionic acid cyclohexane acid anhydride and the like.
- Examples of the combination of a cyclic alkyl group and an aryl group include benzoic acid cyclopentanoic acid anhydride, 4-methylbenzoic acid cyclopentanoic acid anhydride, benzoic acid cyclohexane acid anhydride, and the like.
- Examples of combinations of cyclic alkyl groups and functional hydrocarbon groups include: cycloacetic acid cyclopentanoic acid anhydride, cyclopentanoic acid trifluoroacetic acid anhydride, cyclopentanoic acid 2-cyanoacetic acid anhydride, cyclopentanoic acid methoxyacetic acid An anhydride, a cyclohexane acid fluoroacetic anhydride, etc. are mentioned.
- alkenyl groups examples include acrylic acid 2-methylacrylic anhydride, acrylic acid 3-methylacrylic anhydride, acrylic acid 3-butenoic anhydride, 2-methylacrylic acid 3-methylacrylic anhydride Thing etc. are mentioned.
- Examples of the combination of an alkenyl group and an alkynyl group include propionic anhydride, acrylic acid 2-butynoic acid anhydride, 2-methylacrylic acid propionic acid anhydride, and the like.
- alkenyl groups and aryl groups examples include acrylic acid benzoic anhydride, acrylic acid 4-methylbenzoic acid anhydride, 2-methylacrylic acid benzoic acid anhydride, and the like.
- Examples of combinations of alkenyl groups and functional hydrocarbon groups include acrylic acid fluoroacetic anhydride, acrylic acid trifluoroacetic acid anhydride, acrylic acid 2-cyanoacetic acid anhydride, acrylic acid methoxyacetic acid anhydride, 2- Examples include methylacrylic acid fluoroacetic anhydride.
- Examples of combinations of alkynyl groups include propionic acid 2-butynoic acid anhydride, propionic acid 3-butynoic acid anhydride, 2-butyric acid 3-butynoic acid anhydride, and the like.
- Examples of the combination of alkynyl group and aryl group include propionic anhydride of benzoic acid, propionic anhydride of 4-methylbenzoic acid, and 2-butynoic anhydride of benzoic acid.
- Examples of combinations of alkynyl groups and functional hydrocarbon groups include propionic acid fluoroacetic anhydride, propionic acid trifluoroacetic acid anhydride, propionic acid 2-cyanoacetic acid anhydride, propionic acid methoxyacetic acid anhydride, 2- Examples include butyric acid fluoroacetic anhydride.
- Examples of combinations of aryl groups include 4-methylbenzoic anhydride, benzoic acid 1-naphthalene carboxylic acid anhydride, 4-methylbenzoic acid 1-naphthalene carboxylic acid anhydride, and the like.
- Examples of combinations of aryl groups and functional hydrocarbon groups include benzoic acid fluoroacetic anhydride, benzoic acid trifluoroacetic acid anhydride, benzoic acid 2-cyanoacetic acid anhydride, benzoic acid methoxyacetic acid anhydride, 4- Examples thereof include methylbenzoic acid fluoroacetic anhydride.
- hydrocarbon groups having functional groups examples include trifluoroacetic anhydride, fluoroacetic acid 2-cyanoacetic anhydride, fluoroacetic acid methoxyacetic anhydride, trifluoroacetic acid 2-cyanoacetic anhydride, and the like. Can be mentioned.
- acetic anhydride, propionic acid anhydride, 2-methylpropionic acid anhydride, cyclopentanecarboxylic acid anhydride, cyclohexanecarboxylic acid anhydride, etc. acrylic acid Anhydride, 2-methylacrylic anhydride, 3-methylacrylic anhydride, 2,3-dimethylacrylic anhydride, 3,3-dimethylacrylic anhydride, 3-butenoic anhydride, 2-methyl- 3-butenoic anhydride, propionic anhydride, 2-butyric anhydride, benzoic anhydride, 2-methylbenzoic anhydride, 4-methylbenzoic anhydride, 4-tert-butylbenzoic anhydride, Trifluoroacetic anhydride, 3,3,3-trifluoropropionic anhydride, 2- (trifluoromethyl) acrylic anhydride, 2- (4-fluorophenyl) acrylic acid Water, 4-fluorobenzoic an
- These compounds can improve the charge / discharge rate characteristics, input / output characteristics, and impedance characteristics, especially after endurance testing, by properly forming a bond with lithium oxalate salt to form a film with excellent durability. It is preferable from a viewpoint that can be made.
- the content of the carboxylic acid anhydride with respect to the electrolytic solution of the present disclosure is not particularly limited, and may be arbitrary as long as the effect of the present disclosure is not significantly impaired. %, Preferably 0.1% by mass or more, and usually 5% by mass or less, preferably 3% by mass or less. When the content of the carboxylic acid anhydride is within the above range, the effect of improving the cycle characteristics is easily exhibited, and the battery characteristics are easily improved because the reactivity is suitable.
- auxiliaries can be used for the electrolytic solution of the present disclosure.
- Other auxiliaries include pentane, heptane, octane, nonane, decane, cycloheptane, benzene, furan, naphthalene, 2-phenylbicyclohexyl, cyclohexane, 2,4,8,10-tetraoxaspiro [5.5].
- Hydrocarbon compounds such as undecane, 3,9-divinyl-2,4,8,10-tetraoxaspiro [5.5] undecane; Fluorobenzene, difluorobenzene, hexafluorobenzene, benzotrifluoride, monofluorobenzene, 1-fluoro-2-cyclohexylbenzene, 1-fluoro-4-tert-butylbenzene, 1-fluoro-3-cyclohexylbenzene, 1-fluoro Fluorinated aromatic compounds such as -2-cyclohexylbenzene and fluorinated biphenyl; Carbonate compounds such as erythritan carbonate, spiro-bis-dimethylene carbonate, methoxyethyl-methyl carbonate; Ether compounds such as dioxolane, dioxane, 2,5,8,11-tetraoxadodecane, 2,5,8,11,14-pentaoxapentadecane,
- Nitrogen-containing compounds such as 1-methyl-2-pyrrolidinone, 1-methyl-2-piperidone, 3-methyl-2-oxazolidinone, 1,3-dimethyl-2-imidazolidinone and N-methylsuccinimide, nitromethane, nitroethane, ethylenediamine Compound; Trimethyl phosphite, triethyl phosphite, triphenyl phosphite, trimethyl phosphate, triethyl phosphate, triphenyl phosphate, dimethyl methylphosphonate, diethyl ethylphosphonate, dimethyl vinylphosphonate, diethyl vinylphosphonate, diethylphospho Ethyl acetate, methyl dimethylphosphinate, ethyl diethylphosphinate, trimethylphosphine oxide, triethylphosphine oxide, bis (2,2-difluoroethyl) phosphate 2,2,2-trimethylphosphine oxide
- auxiliary agent a phosphorus-containing compound is preferable, and tris (trimethylsilyl) phosphate and phosphorous acid (tristrimethylsilyl) are preferable.
- the amount of the other auxiliary compounded is not particularly limited, and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the other auxiliary agent is preferably 0.01% by mass or more and 5% by mass or less in 100% by mass of the electrolytic solution. Within this range, the effects of other auxiliaries can be sufficiently exhibited, and it is easy to avoid a situation in which battery characteristics such as high-load discharge characteristics deteriorate.
- the blending amount of other auxiliaries is more preferably 0.1% by mass or more, further preferably 0.2% by mass or more, more preferably 3% by mass or less, still more preferably 1% by mass or less. .
- the electrolytic solution of the present disclosure includes cyclic and chain carboxylic acid esters, ether compounds, nitrogen-containing compounds, boron-containing compounds, organic silicon-containing compounds, non-flammable (flame retardant) agents, and interfaces within a range that does not impair the effects of the present disclosure.
- An activator, a high dielectric additive, a cycle characteristic and rate characteristic improver, a sulfone compound and the like may be further contained as additives.
- Examples of the cyclic carboxylic acid ester include those having 3 to 12 total carbon atoms in the structural formula. Specific examples include gamma butyrolactone, gamma valerolactone, gamma caprolactone, epsilon caprolactone, 3-methyl- ⁇ -butyrolactone, and the like. Among these, gamma butyrolactone is particularly preferable from the viewpoint of improving the characteristics of the electrochemical device derived from the improvement of the degree of lithium ion dissociation.
- the compounding amount of the cyclic carboxylic acid ester as an additive is usually 0.1% by mass or more, more preferably 1% by mass or more, in 100% by mass of the solvent. Within this range, the electrical conductivity of the electrolytic solution is improved, and the large current discharge characteristics of the electrochemical device are easily improved. Moreover, the compounding quantity of cyclic carboxylic acid ester becomes like this. Preferably it is 10 mass% or less, More preferably, it is 5 mass% or less. By setting the upper limit in this way, the viscosity of the electrolytic solution is set in an appropriate range, the decrease in electrical conductivity is avoided, the increase in negative electrode resistance is suppressed, and the large current discharge characteristics of the electrochemical device are set in a favorable range. Make it easier.
- cyclic carboxylic acid ester a fluorinated cyclic carboxylic acid ester (fluorinated lactone) can also be suitably used.
- fluorine-containing lactone for example, the following formula (C):
- X 15 to X 20 are the same or different and all are —H, —F, —Cl, —CH 3 or a fluorinated alkyl group; provided that at least one of X 15 to X 20 is a fluorinated alkyl Base)
- the fluorine-containing lactone shown by these is mentioned.
- Examples of the fluorinated alkyl group for X 15 to X 20 include —CFH 2 , —CF 2 H, —CF 3 , —CH 2 CF 3 , —CF 2 CF 3 , —CH 2 CF 2 CF 3 , —CF (CF 3 ) 2 and the like are mentioned, and —CH 2 CF 3 and —CH 2 CF 2 CF 3 are preferable from the viewpoint of high oxidation resistance and an effect of improving safety.
- X 15 to X 20 is a fluorinated alkyl group, —H, —F, —Cl, —CH 3 or the fluorinated alkyl group is substituted at only one position of X 15 to X 20.
- a plurality of locations may be substituted.
- it is 1 to 3 sites, more preferably 1 to 2 sites, from the viewpoint of good solubility of the electrolyte salt.
- the substitution position of the fluorinated alkyl group is not particularly limited. However, since the synthesis yield is good, X 17 and / or X 18 is particularly preferably X 17 or X 18 is a fluorinated alkyl group, particularly —CH 2 CF 3. , —CH 2 CF 2 CF 3 is preferable. X 15 to X 20 other than the fluorinated alkyl group are —H, —F, —Cl or CH 3 , and —H is particularly preferable from the viewpoint of good solubility of the electrolyte salt.
- one of A and B is CX 226 X 227 (X 226 and X 227 are the same or different, and all are —H, —F, —Cl, —CF 3 , —CH 3 or a hydrogen atom)
- Rf 12 is a fluorinated alkyl group or a fluorinated group which may have an ether bond
- X 221 and X 222 are the same or different, all are —H, —F, —Cl, —CF 3 or CH 3 ;
- X 223 to X 225 are the same or different and both are —H, —F , —Cl or an alkyl group in which a hydrogen atom may be substituted with a halogen atom and may contain a hetero atom in the chain;
- n 0 or 1
- the characteristics as an electrolytic solution in the present disclosure are improved in that excellent characteristics such as a high dielectric constant and a high withstand voltage can be particularly exhibited, and in addition, the solubility of the electrolyte salt and the reduction of internal resistance are favorable.
- Examples of the chain carboxylic acid ester include those having 3 to 7 carbon atoms in the structural formula. Specifically, methyl acetate, ethyl acetate, acetate n-propyl, isopropyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, Isobutyl propionate, n-butyl propionate, methyl butyrate, isobutyl propionate, t-butyl propionate, methyl butyrate, ethyl butyrate, n-propyl butyrate, isopropyl butyrate, methyl isobutyrate, ethyl isobutyrate, iso Examples thereof include n-propyl butyrate and isopropyl isobutyrate.
- methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, isopropyl propionate, methyl butyrate, ethyl butyrate, etc. are ions due to viscosity reduction. It is preferable from the viewpoint of improvement of conductivity.
- a chain ether having 2 to 10 carbon atoms and a cyclic ether having 3 to 6 carbon atoms are preferable.
- the chain ether having 2 to 10 carbon atoms include dimethyl ether, diethyl ether, di-n-butyl ether, dimethoxymethane, methoxyethoxymethane, diethoxymethane, dimethoxyethane, methoxyethoxyethane, diethoxyethane, and ethylene glycol di-n.
- -Propyl ether ethylene glycol di-n-butyl ether, diethylene glycol, diethylene glycol dimethyl ether, pentaethylene glycol, triethylene glycol dimethyl ether, triethylene glycol, tetraethylene glycol, tetraethylene glycol dimethyl ether, diisopropyl ether and the like.
- a fluorinated ether can also be suitably used.
- the fluorinated ether include the following general formula (I): Rf 3 —O—Rf 4 (I) (Wherein Rf 3 and Rf 4 are the same or different and are an alkyl group having 1 to 10 carbon atoms or a fluorinated alkyl group having 1 to 10 carbon atoms, provided that at least one of Rf 3 and Rf 4 is fluorine. Alkyl group.)
- the fluorinated ether (I) represented by these is mentioned.
- Rf 3 and Rf 4 may be a fluorinated alkyl group having 1 to 10 carbon atoms.
- the flame retardancy of the electrolyte solution, stability at high temperature and high voltage, safety it is preferable that Rf 3 and Rf 4 are both fluorinated alkyl groups having 1 to 10 carbon atoms.
- Rf 3 and Rf 4 may be the same or different from each other. Among them, Rf 3 and Rf 4 are the same or different, Rf 3 is a fluorinated alkyl group having 3 to 6 carbon atoms, and Rf 4 is a fluorinated alkyl group having 2 to 6 carbon atoms. More preferred.
- the fluorinated ether (I) preferably has a fluorine content of 40 to 75% by mass. When it has a fluorine content in this range, it is particularly excellent in the balance between incombustibility and compatibility. Moreover, it is preferable also from a point with favorable oxidation resistance and safety
- the lower limit of the fluorine content is more preferably 45% by mass, still more preferably 50% by mass, and particularly preferably 55% by mass.
- the upper limit is more preferably 70% by mass, and still more preferably 66% by mass.
- the fluorine content of the fluorinated ether (I) is determined based on the structural formula of the fluorinated ether (I): ⁇ (number of fluorine atoms ⁇ 19) / molecular weight of the fluorinated ether (I) ⁇ ⁇ 100 (% ).
- Rf 3 examples include CF 3 CF 2 CH 2 —, CF 3 CFHCF 2 —, HCF 2 CF 2 CF 2 —, HCF 2 CF 2 CH 2 —, CF 3 CF 2 CH 2 CH 2 —, CF 3 CFHCF 2 CH 2 —, HCF 2 CF 2 CF 2 —, HCF 2 CF 2 CH 2 CH 2 —, HCF 2 CF (CF 3 ) CH 2 — and the like can be mentioned.
- Rf 4 includes, for example, —CH 2 CF 2 CF 3 , —CF 2 CFHCF 3 , —CF 2 CF 2 CF 2 H, —CH 2 CF 2 CF 2 H, —CH 2 CH 2 CF 2 CF 3 , —CH 2 CF 2 CFHCF 3 , —CF 2 CF 2 CF 2 CF 2 H, —CH 2 CF 2 CF 2 H, —CH 2 CH 2 CF 2 CF 2 H, —CH 2 CF (CF 3 ) CF 2 H, —CF 2 CF 2 H, —CH 2 CF 2 H, —CF 2 CH 3 and the like can be mentioned.
- fluorinated ether (I) include, for example, HCF 2 CF 2 CH 2 OCF 2 CF 2 H, CF 3 CF 2 CH 2 OCF 2 CF 2 H, HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 , CF 3 CF 2 CH 2 OCF 2 CFHCF 3 , C 6 F 13 OCH 3 , C 6 F 13 OC 2 H 5 , C 8 F 17 OCH 3 , C 8 F 17 OC 2 H 5 , CF 3 CFHCF 2 CH (CH 3 ) OCF 2 CFHCF 3 , HCF 2 CF 2 OCH (C 2 H 5 ) 2 , HCF 2 CF 2 OC 4 H 9 , HCF 2 CF 2 OCH 2 CH (C 2 H 5 ) 2 , HCF 2 CF 2 OCH 2 CH (CH 3) 2 or the like can be mentioned.
- fluorinated ether (I) having a high boiling point.
- the boiling point of the fluorinated ether (I) is preferably 67 to 120 ° C. More preferably, it is 80 degreeC or more, More preferably, it is 90 degreeC or more.
- fluorinated ether (I) examples include CF 3 CH 2 OCF 2 CFHCF 3 , CF 3 CF 2 CH 2 OCF 2 CFHCF 3 , HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 , and HCF 2 CF 2 CH 2 OCH 2 CF 2 CF 2 H , CF 3 CFHCF 2 CH 2 OCF 2 CFHCF 3, HCF 2 CF 2 CH 2 OCF 2 CF 2 H, CF 3 CF 2 CH 2 OCF 2 CF 2 1 type of H, etc. or two The above is mentioned.
- HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 (boiling point 106 ° C.), CF 3 CF 2 CH is advantageous because of its high boiling point, compatibility with other solvents, and good solubility of the electrolyte salt.
- 2 OCF 2 CFHCF 3 (boiling point 82 ° C.), HCF 2 CF 2 CH 2 OCF 2 CF 2 H (boiling point 92 ° C.) and CF 3 CF 2 CH 2 OCF 2 CF 2 H (boiling point 68 ° C.).
- HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 (boiling point 106 ° C.) and HCF 2 CF 2 CH 2 OCF 2 CF 2 H (boiling point 92 ° C.).
- HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 (boiling point 106 ° C.)
- HCF 2 CF 2 CH 2 OCF 2 CF 2 H (boiling point 92 ° C.).
- One type is more preferable.
- Examples of the cyclic ether having 3 to 6 carbon atoms include 1,2-dioxane, 1,3-dioxane, 2-methyl-1,3-dioxane, 4-methyl-1,3-dioxane, 1,4-dioxane, meta Formaldehyde, 2-methyl-1,3-dioxolane, 1,3-dioxolane, 4-methyl-1,3-dioxolane, 2- (trifluoroethyl) dioxolane 2,2, -bis (trifluoromethyl) -1, Examples thereof include 3-dioxolane and the like and fluorinated compounds thereof.
- dimethoxymethane, diethoxymethane, ethoxymethoxymethane, ethylene glycol-n-propyl ether, ethylene glycol di-n-butyl ether, diethylene glycol dimethyl ether, and crown ether have a high solvating ability to lithium ions and an ion dissociation degree.
- dimethoxymethane, diethoxymethane, and ethoxymethoxymethane are preferable because they have low viscosity and give high ionic conductivity.
- nitrogen-containing compound examples include nitrile, fluorine-containing nitrile, carboxylic acid amide, fluorine-containing carboxylic acid amide, sulfonic acid amide, fluorine-containing sulfonic acid amide, acetamide, and formamide.
- 1-methyl-2-pyrrolidinone, 1-methyl-2-piperidone, 3-methyl-2-oxaziridinone, 1,3-dimethyl-2-imidazolidinone, N-methylsuccinimide and the like can be used.
- the nitrile compounds represented by the general formulas (1a), (1b) and (1c) are not included in the nitrogen-containing compound.
- boron-containing compound examples include boric acid esters such as trimethyl borate and triethyl borate, boric ether, and alkyl borate.
- organosilicon-containing compound examples include (CH 3 ) 4 —Si, (CH 3 ) 3 —Si—Si (CH 3 ) 3 , silicon oil, and the like.
- Examples of the incombustible (flame retardant) agent include phosphate esters and phosphazene compounds.
- Examples of the phosphate ester include fluorine-containing alkyl phosphate esters, non-fluorinated alkyl phosphate esters, and aryl phosphate esters. Especially, it is preferable that it is a fluorine-containing alkyl phosphate ester at the point which can exhibit a nonflammable effect in a small quantity.
- Examples of the phosphazene compounds include methoxypentafluorocyclotriphosphazene, phenoxypentafluorocyclotriphosphazene, dimethylaminopentafluorocyclotriphosphazene, diethylaminopentafluorocyclotriphosphazene, ethoxypentafluorocyclotriphosphazene, ethoxyheptafluorocyclotetraphosphazene, and the like. Is mentioned.
- fluorine-containing alkyl phosphate ester examples include fluorine-containing dialkyl phosphate esters described in JP-A No. 11-233141 and cyclic alkyl phosphate esters described in JP-A No. 11-283669. Or fluorine-containing trialkyl phosphate ester etc. are mentioned.
- non-flammable (flame retardant) agent (CH 3 O) 3 P ⁇ O, (CF 3 CH 2 O) 3 P ⁇ O, (HCF 2 CH 2 O) 3 P ⁇ O, (CF 3 CF 2 CH 2 ) 3 P ⁇ O, (HCF 2 CF 2 CH 2 ) 3 P ⁇ O and the like are preferable.
- the surfactant may be any of a cationic surfactant, an anionic surfactant, a nonionic surfactant, and an amphoteric surfactant. From the viewpoint of good cycle characteristics and rate characteristics, a fluorine atom It is preferable that it contains.
- Rf 5 COO ⁇ M + As such a surfactant containing a fluorine atom, for example, the following formula (30): Rf 5 COO ⁇ M + (30) (In the formula, Rf 5 is a fluorine-containing alkyl group which may contain an ether bond having 3 to 10 carbon atoms; M + is Li + , Na + , K + or NHR ′ 3 + (R ′ is the same or different; , Each of which is H or an alkyl group having 1 to 3 carbon atoms)) Or a fluorine-containing carboxylate represented by the following formula (40): Rf 6 SO 3 - M + (40) (Wherein Rf 6 is a fluorine-containing alkyl group which may contain an ether bond having 3 to 10 carbon atoms; M + is Li + , Na + , K + or NHR ′ 3 + (R ′ is the same or different) , Each of which is H or an alkyl group having 1 to 3 carbon atoms)
- the content of the surfactant is preferably 0.01 to 2% by mass in the electrolytic solution from the viewpoint that the surface tension of the electrolytic solution can be reduced without reducing the charge / discharge cycle characteristics.
- Examples of the high dielectric additive include sulfolane, methyl sulfolane, ⁇ -butyrolactone, ⁇ -valerolactone, and the like.
- cycle characteristic and rate characteristic improving agent examples include methyl acetate, ethyl acetate, tetrahydrofuran, 1,4-dioxane and the like.
- electrolytic solution of the present disclosure may be further combined with a polymer material to form a gel (plasticized) gel electrolytic solution.
- Examples of such a polymer material include conventionally known polyethylene oxide and polypropylene oxide, modified products thereof (JP-A-8-222270 and JP-A-2002-1000040); polyacrylate polymers, polyacrylonitrile, and polyvinylidene fluoride.
- Fluorine resins such as vinylidene fluoride-hexafluoropropylene copolymer (JP-A-4-506726, JP-A-8-507407, JP-A-10-294131); Examples include composites with resins (Japanese Patent Laid-Open Nos. 11-35765 and 11-86630).
- the electrolytic solution of the present disclosure may also include an ion conductive compound described in Japanese Patent Application No. 2004-301934.
- This ion conductive compound has the formula (101): A- (D) -B (101) [Wherein D is the formula (201): -(D1) n- (FAE) m- (AE) p- (Y) q- (201) (In the formula, D1 represents the formula (2a):
- Rf is a fluorine-containing ether group which may have a crosslinkable functional group; groups R 10 couples Rf main chain or a bond
- An ether unit having a fluorine-containing ether group in the side chain represented by FAE is represented by formula (2b):
- Rfa is hydrogen atom, a crosslinkable good fluorinated alkyl group optionally having a functional group; R 11 couples Rfa main chain group or a bond
- An ether unit having a fluorinated alkyl group in the side chain represented by AE is the formula (2c):
- R 13 has a hydrogen atom, an alkyl group which may have a crosslinkable functional group, an aliphatic cyclic hydrocarbon group which may have a crosslinkable functional group, or a crosslinkable functional group.
- R 12 is a group or a bond which bonds R 13 to the main chain
- An ether unit represented by: Y represents the formulas (2d-1) to (2d-3):
- a and B are the same or different and are a hydrogen atom, a fluorine atom and / or an alkyl group which may contain a crosslinkable functional group, a fluorine atom and / or a phenyl group which may contain a crosslinkable functional group, —COOH A group, —OR (wherein R is a hydrogen atom or a fluorine atom and / or an alkyl group which may contain a crosslinkable functional group), an ester group or a carbonate group (provided that when D is terminated with an oxygen atom, a —COOH group, Not OR, ester group and carbonate group)] It
- the electrolytic solution of the present disclosure may include a sulfone compound.
- a sulfone compound a cyclic sulfone having 3 to 6 carbon atoms and a chain sulfone having 2 to 6 carbon atoms are preferable.
- the number of sulfonyl groups in one molecule is preferably 1 or 2.
- cyclic sulfone examples include trimethylene sulfones, tetramethylene sulfones, and hexamethylene sulfones that are monosulfone compounds; trimethylene disulfones, tetramethylene disulfones, and hexamethylene disulfones that are disulfone compounds.
- trimethylene sulfones, tetramethylene disulfones, and hexamethylene disulfones that are disulfone compounds examples include trimethylene sulfones, tetramethylene sulfones, and hexamethylene sulfones that are monosulfone compounds; trimethylene disulfones, tetramethylene disulfones, and hexamethylene disulfones that are disulfone compounds.
- the sulfolane is preferably sulfolane and / or a sulfolane derivative (hereinafter sometimes abbreviated as “sulfolane” including sulfolane).
- sulfolane derivative one in which one or more hydrogen atoms bonded to the carbon atom constituting the sulfolane ring are substituted with a fluorine atom or an alkyl group is preferable.
- chain sulfone dimethyl sulfone, ethyl methyl sulfone, diethyl sulfone, n-propyl methyl sulfone, n-propyl ethyl sulfone, di-n-propyl sulfone, isopropyl methyl sulfone, isopropyl ethyl sulfone, diisopropyl sulfone, n- Butyl methyl sulfone, n-butyl ethyl sulfone, t-butyl methyl sulfone, t-butyl ethyl sulfone, monofluoromethyl methyl sulfone, difluoromethyl methyl sulfone, trifluoromethyl methyl sulfone, monofluoroethyl methyl sulfone, difluoroethyl methyl sulfone
- the content of the sulfone compound is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired. However, in 100% by volume of the solvent, usually 0.3% by volume or more, preferably 0.5% by volume or more. More preferably, it is 1% by volume or more, and is usually 40% by volume or less, preferably 35% by volume or less, more preferably 30% by volume or less. If the content of the sulfone compound is within the above range, the effect of improving the durability such as cycle characteristics and storage characteristics can be easily obtained, and the viscosity of the non-aqueous electrolyte solution is set to an appropriate range, and the electric conductivity is lowered. Can be avoided, and the input / output characteristics and charge / discharge rate characteristics of the non-aqueous electrolyte secondary battery can be within an appropriate range.
- the electrolytic solution of the present disclosure is at least one selected from the group consisting of lithium fluorophosphates (excluding LiPF 6 ) and lithium salts having an S ⁇ O group as additives from the viewpoint of improving output characteristics. It is also preferable that the compound (7) is included. In addition, when using a compound (7) as an additive, it is preferable to use compounds other than a compound (7) as electrolyte salt mentioned above.
- lithium fluorophosphate examples include lithium monofluorophosphate (LiPO 3 F), lithium difluorophosphate (LiPO 2 F 2 ), and the like.
- lithium salt having an S ⁇ O group examples include lithium monofluorosulfonate (FSO 3 Li), lithium methyl sulfate (CH 3 OSO 3 Li), lithium ethyl sulfate (C 2 H 5 OSO 3 Li), 2, 2 , 2-trifluoroethyl lithium sulfate and the like.
- LiPO 2 F 2 , FSO 3 Li, and C 2 H 5 OSO 3 Li are particularly preferable.
- the content of the compound (7) is preferably 0.001 to 20% by mass, more preferably 0.01 to 15% by mass, and 0.1 to 10% by mass with respect to the electrolytic solution. More preferred is 0.1 to 7% by mass.
- the electrolyte solution of the present disclosure preferably has a hydrogen fluoride (HF) content of 5 to 200 ppm.
- HF hydrogen fluoride
- the content of HF is more preferably 10 ppm or more, and further preferably 20 ppm or more.
- the content of HF is more preferably 100 ppm or less, still more preferably 80 ppm or less, and particularly preferably 50 ppm or less.
- the content of HF can be measured by a neutralization titration method.
- the electrolytic solution of the present disclosure may be prepared by any method using the components described above.
- the electrolytic solution of the present disclosure can be suitably applied to electrochemical devices such as lithium ion secondary batteries, lithium ion capacitors, hybrid capacitors, and electric double layer capacitors.
- electrochemical devices such as lithium ion secondary batteries, lithium ion capacitors, hybrid capacitors, and electric double layer capacitors.
- a non-aqueous electrolyte battery using the electrolytic solution of the present disclosure will be described.
- the non-aqueous electrolyte battery can have a known structure, and typically includes a positive electrode and a positive electrode capable of occluding and releasing ions (for example, lithium ions), and the electrolytic solution of the present disclosure.
- Such an electrochemical device including the electrolytic solution of the present disclosure is also one of the present disclosure.
- Electrochemical devices include lithium ion secondary batteries, lithium ion capacitors, capacitors (hybrid capacitors, electric double layer capacitors), radical batteries, solar cells (especially dye-sensitized solar cells), lithium ion primary batteries, fuel cells, Various electrochemical sensors, electrochromic devices, electrochemical switching devices, aluminum electrolytic capacitors, tantalum electrolytic capacitors, and the like can be given, and lithium ion secondary batteries, lithium ion capacitors, and electric double layer capacitors are preferable.
- a module including the electrochemical device is also one of the present disclosure.
- the present disclosure also relates to a lithium ion secondary battery including the electrolytic solution of the present disclosure.
- the lithium ion secondary battery preferably includes a positive electrode, a negative electrode, and the above-described electrolytic solution.
- the positive electrode is composed of a positive electrode active material layer containing a positive electrode active material and a current collector.
- the positive electrode active material is not particularly limited as long as it can electrochemically occlude and release lithium ions.
- lithium-containing transition metal composite oxides, lithium-containing transition metal phosphate compounds, sulfides, conductive materials A functional polymer for example, lithium-containing transition metal composite oxides, lithium-containing transition metal phosphate compounds, sulfides, conductive materials A functional polymer.
- a lithium containing transition metal complex oxide and a lithium containing transition metal phosphate compound are preferable, and especially the lithium containing transition metal complex oxide which produces a high voltage is preferable.
- V, Ti, Cr, Mn, Fe, Co, Ni, Cu and the like are preferable as the transition metal of the lithium-containing transition metal composite oxide.
- Specific examples include lithium-cobalt composite oxides such as LiCoO 2 , LiNiO 2 and the like.
- substituted ones for example, LiNi 0.5 Mn 0.5 O 2 , LiNi 0.85 Co 0.10 Al 0.05 O 2 , LiNi 0.5 Co 0.2 Mn 0.3 O 2, LiNi 0.6 Co 0.2 Mn 0.2 O 2, LiNi 0.33 Co 0.33 Mn 0.33 O 2, LiNi 0.45 Co 0.10 Al 0.45 O 2, LiMn 1. 8 Al 0.2 O 4 , LiMn 1.5 Ni 0.5 O 4 and the like.
- LiMn 1.5 Ni 0.5 O 4 LiNi 0.5 Co 0.2 Mn 0.3 O 2 having a high energy density even when a high voltage is applied, LiNi 0.6 Co 0.2 Mn 0.2 O 2 is preferred.
- LiMn 1.5 Ni 0.5 O 4 is preferable for a high voltage of 4.4 V or higher.
- transition metal of the lithium-containing transition metal phosphate compound V, Ti, Cr, Mn, Fe, Co, Ni, Cu and the like are preferable, and specific examples include, for example, LiFePO 4 , Li 3 Fe 2 (PO 4 ). 3 , iron phosphates such as LiFeP 2 O 7 , cobalt phosphates such as LiCoPO 4 , and some of the transition metal atoms that are the main components of these lithium transition metal phosphate compounds are Al, Ti, V, Cr, Mn , Fe, Co, Li, Ni, Cu, Zn, Mg, Ga, Zr, Nb, Si and the like substituted with other elements.
- lithium-containing transition metal composite oxide examples include: Formula: Li a Mn 2-b M 1 b O 4 (where 0.9 ⁇ a; 0 ⁇ b ⁇ 1.5; M 1 is Fe, Co, Ni, Cu, Zn, Al, Sn, Cr, A lithium-manganese spinel composite oxide represented by V, Ti, Mg, Ca, Sr, B, Ga, In, Si, and Ge).
- LiNi 1-c M 2 c O 2 (where 0 ⁇ c ⁇ 0.5; M 2 is Fe, Co, Mn, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Lithium-nickel composite oxide represented by (at least one metal selected from the group consisting of Sr, B, Ga, In, Si and Ge), or Formula: LiCo 1-d M 3 d O 2 (where 0 ⁇ d ⁇ 0.5; M 3 is Fe, Ni, Mn, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Lithium-cobalt composite oxide represented by at least one metal selected from the group consisting of Sr, B, Ga, In, Si, and Ge.
- LiCoO 2 , LiMnO 2 , LiNiO 2 , LiMn 2 O 4 , LiNi 0.8 Co 0.15 Al 0.05 O 2 can be provided because the lithium ion secondary battery with high energy density and high output can be provided. Or LiNi 1/3 Co 1/3 Mn 1/3 O 2 is preferred.
- LiFePO 4 LiNi 0.8 Co 0.2 O 2 , Li 1.2 Fe 0.4 Mn 0.4 O 2 , LiNi 0.5 Mn 0.5 O 2 , LiV 3 Examples include O 6 and Li 2 MnO 3 .
- sulfides include compounds having a two-dimensional layered structure such as TiS 2 and MoS 2 , and solid compounds represented by the general formula Me x Mo 6 S 8 (Me is various transition metals including Pb, Ag, and Cu). Examples thereof include a chevrel compound having a three-dimensional skeleton structure. Further, also include organolithium sulfides represented by elemental sulfur and LiS x.
- Examples of the conductive polymer include a p-doping type conductive polymer and an n-doping type conductive polymer.
- Examples of the conductive polymer include polyacetylene, polyphenylene, heterocyclic polymers, ionic polymers, ladders, and network polymers.
- lithium phosphate in the positive electrode active material because continuous charge characteristics are improved.
- the lower limit of the amount of lithium phosphate used is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and further preferably 0.5% by mass with respect to the total of the positive electrode active material and lithium phosphate. %, And the upper limit is preferably 10% by mass or less, more preferably 8% by mass or less, and still more preferably 5% by mass or less.
- Surface adhering substances include aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, boron oxide, antimony oxide, bismuth oxide, lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate And sulfates such as aluminum sulfate, carbonates such as lithium carbonate, calcium carbonate, and magnesium carbonate, and carbon.
- these surface adhering substances are dissolved or suspended in a solvent, impregnated and added to the positive electrode active material, and dried.
- the surface adhering substance precursor is dissolved or suspended in a solvent and impregnated and added to the positive electrode active material, It can be made to adhere to the surface of the positive electrode active material by a method of reacting by heating or the like, a method of adding to the positive electrode active material precursor and firing simultaneously.
- the method of making carbonaceous adhere mechanically later in the form of activated carbon etc. can also be used, for example.
- the amount of the surface adhering substance is by mass with respect to the positive electrode active material, preferably 0.1 ppm or more, more preferably 1 ppm or more, still more preferably 10 ppm or more, and the upper limit, preferably 20% or less, more preferably as the lower limit. Is used at 10% or less, more preferably 5% or less.
- the surface adhering substance can suppress the oxidation reaction of the electrolyte solution on the surface of the positive electrode active material and can improve the battery life. However, when the amount of the adhering quantity is too small, the effect is not sufficiently manifested. If it is too high, the resistance may increase in order to inhibit the entry and exit of lithium ions.
- Examples of the shape of the particles of the positive electrode active material include a lump shape, a polyhedron shape, a sphere shape, an oval sphere shape, a plate shape, a needle shape, and a column shape as conventionally used. Moreover, primary particles may aggregate to form secondary particles.
- the tap density of the positive electrode active material is preferably 0.5 g / cm 3 or more, more preferably 0.8 g / cm 3 or more, and further preferably 1.0 g / cm 3 or more. If the tap density of the positive electrode active material is lower than the lower limit, the amount of the required dispersion medium increases when the positive electrode active material layer is formed, and the necessary amount of conductive material and binder increases, so that the positive electrode to the positive electrode active material layer The filling rate of the active material is restricted, and the battery capacity may be restricted. By using a complex oxide powder having a high tap density, a high-density positive electrode active material layer can be formed.
- the tap density is preferably as large as possible, and there is no particular upper limit, but if it is too large, diffusion of lithium ions using the electrolytic solution in the positive electrode active material layer as a medium is rate-limiting, and load characteristics may be easily reduced.
- the upper limit is preferably 4.0 g / cm 3 or less, more preferably 3.7 g / cm 3 or less, and still more preferably 3.5 g / cm 3 or less.
- the tap density is 5 to 10 g of the positive electrode active material powder in a 10 ml glass measuring cylinder and tapped 200 times with a stroke of about 20 mm, and the powder packing density (tap density) g / cm 3 Asking.
- the median diameter d50 of the positive electrode active material particles is preferably 0.3 ⁇ m or more, more preferably 0.5 ⁇ m or more, and even more preferably. Is 0.8 ⁇ m or more, most preferably 1.0 ⁇ m or more, preferably 30 ⁇ m or less, more preferably 27 ⁇ m or less, still more preferably 25 ⁇ m or less, and most preferably 22 ⁇ m or less. If the lower limit is not reached, a high tap density product may not be obtained.
- the positive electrode of the battery that is, the active material
- a conductive material, a binder, or the like is slurried with a solvent and applied as a thin film, problems such as streaking may occur.
- the positive electrode active materials having different median diameters d50, it is possible to further improve the filling property at the time of forming the positive electrode.
- the median diameter d50 is measured by a known laser diffraction / scattering particle size distribution measuring device.
- LA-920 manufactured by HORIBA is used as a particle size distribution meter
- a 0.1% by mass sodium hexametaphosphate aqueous solution is used as a dispersion medium for measurement, and a measurement refractive index of 1.24 is set after ultrasonic dispersion for 5 minutes. Measured.
- the average primary particle diameter of the positive electrode active material is preferably 0.05 ⁇ m or more, more preferably 0.1 ⁇ m or more, and still more preferably 0.8.
- the upper limit is preferably 5 ⁇ m or less, more preferably 4 ⁇ m or less, still more preferably 3 ⁇ m or less, and most preferably 2 ⁇ m or less. If the above upper limit is exceeded, it is difficult to form spherical secondary particles, which adversely affects the powder filling property, or the specific surface area is greatly reduced, so that there is a high possibility that battery performance such as output characteristics will deteriorate. is there. On the other hand, when the value falls below the lower limit, there is a case where problems such as inferior reversibility of charge / discharge are usually caused because crystals are not developed.
- the primary particle diameter is measured by observation using a scanning electron microscope (SEM). Specifically, in a photograph at a magnification of 10000 times, the longest value of the intercept by the left and right boundary lines of the primary particles with respect to the horizontal straight line is obtained for any 50 primary particles and obtained by taking the average value. It is done.
- SEM scanning electron microscope
- BET specific surface area of the positive electrode active material is preferably 0.1 m 2 / g or more, more preferably 0.2 m 2 / g or more, further preferably 0.3 m 2 / g or more, and the upper limit is preferably 50 m 2 / g or less, more preferably 40 m 2 / g or less, still more preferably 30 m 2 / g or less. If the BET specific surface area is smaller than this range, the battery performance tends to be lowered. If the BET specific surface area is larger, the tap density is difficult to increase, and a problem may occur in applicability when forming the positive electrode active material layer.
- the BET specific surface area is large after preliminarily drying the sample at 150 ° C. for 30 minutes under a nitrogen flow using a surface area meter (for example, a fully automatic surface area measuring device manufactured by Okura Riken Co., Ltd.). It is defined by a value measured by a nitrogen adsorption BET one-point method using a gas flow method using a nitrogen-helium mixed gas that is accurately adjusted so that the value of the relative pressure of nitrogen with respect to atmospheric pressure is 0.3.
- the positive electrode active material particles are mainly secondary particles. It is preferable that The particles of the positive electrode active material preferably contain 0.5 to 7.0% by volume of fine particles having an average secondary particle size of 40 ⁇ m or less and an average primary particle size of 1 ⁇ m or less. By containing fine particles having an average primary particle size of 1 ⁇ m or less, the contact area with the electrolytic solution is increased, and the diffusion of lithium ions between the electrode and the electrolytic solution can be further accelerated. Output performance can be improved.
- a general method is used as a manufacturing method of the inorganic compound.
- various methods are conceivable for preparing a spherical or elliptical active material.
- a transition metal source material is dissolved or pulverized and dispersed in a solvent such as water, and the pH is adjusted while stirring.
- a spherical precursor is prepared and recovered, and dried as necessary.
- a Li source such as LiOH, Li 2 CO 3 , LiNO 3 is added, and the active material is obtained by baking at a high temperature. .
- the positive electrode active material may be used alone, or two or more of the different compositions may be used in any combination or ratio.
- a combination of LiCoO 2 and LiMn 2 O 4 such as LiNi 0.33 Co 0.33 Mn 0.33 O 2 or a part of this Mn substituted with another transition metal or the like Or a combination with LiCoO 2 or a part of this Co substituted with another transition metal or the like.
- the content of the positive electrode active material is preferably from 50 to 99.5% by mass, more preferably from 80 to 99% by mass, based on the positive electrode mixture, in view of high battery capacity.
- the content of the positive electrode active material in the positive electrode active material layer is preferably 80% by mass or more, more preferably 82% by mass or more, and particularly preferably 84% by mass or more. Moreover, an upper limit becomes like this. Preferably it is 99 mass% or less, More preferably, it is 98 mass% or less. If the content of the positive electrode active material in the positive electrode active material layer is low, the electric capacity may be insufficient. Conversely, if the content is too high, the strength of the positive electrode may be insufficient.
- the positive electrode mixture preferably further contains a binder, a thickener, and a conductive material.
- a binder any material can be used as long as it is a material that is safe with respect to the solvent and electrolyte used in the production of the electrode.
- the content of the binder is usually 0.1% by mass or more, preferably 1% by mass or more, more preferably 1.5% by mass or more, as a ratio of the binder in the positive electrode active material layer. Usually, it is 80 mass% or less, Preferably it is 60 mass% or less, More preferably, it is 40 mass% or less, Most preferably, it is 10 mass% or less.
- the ratio of the binder is too low, the positive electrode active material cannot be sufficiently retained and the positive electrode has insufficient mechanical strength, which may deteriorate battery performance such as cycle characteristics. On the other hand, if it is too high, battery capacity and conductivity may be reduced.
- thickener examples include carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, ethylcellulose, polyvinyl alcohol, oxidized starch, phosphorylated starch, casein, polyvinylpyrrolidone, and salts thereof. 1 type may be used independently or 2 or more types may be used together by arbitrary combinations and a ratio.
- the ratio of the thickener to the active material is usually 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and usually 5% by mass or less, preferably 3%. It is in the range of not more than mass%, more preferably not more than 2 mass%. Below this range, applicability may be significantly reduced. If it exceeds, the ratio of the active material in the positive electrode active material layer may decrease, and there may be a problem that the capacity of the battery decreases and a problem that the resistance between the positive electrode active materials increases.
- a known conductive material can be arbitrarily used as the conductive material.
- Specific examples include metal materials such as copper and nickel, graphite such as natural graphite and artificial graphite, graphite black such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black, and needle coke.
- carbon materials such as amorphous carbon such as carbon nanotubes, fullerenes, and VGCF. In addition, these may be used individually by 1 type and may use 2 or more types together by arbitrary combinations and a ratio.
- the conductive material is usually 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 1% by mass or more, and usually 50% by mass or less, preferably 30% by mass in the positive electrode active material layer. % Or less, more preferably 15% by mass or less. If the content is lower than this range, the conductivity may be insufficient. Conversely, if the content is higher than this range, the battery capacity may decrease.
- the solvent for forming the slurry the positive electrode active material, the conductive material, the binder, and a solvent capable of dissolving or dispersing the thickener used as necessary may be used.
- an aqueous solvent or an organic solvent may be used.
- the aqueous solvent include water, a mixed medium of alcohol and water, and the like.
- the organic solvent include aliphatic hydrocarbons such as hexane; aromatic hydrocarbons such as benzene, toluene, xylene, and methylnaphthalene; heterocyclic compounds such as quinoline and pyridine; ketones such as acetone, methyl ethyl ketone, and cyclohexanone.
- Esters such as methyl acetate and methyl acrylate; amines such as diethylenetriamine and N, N-dimethylaminopropylamine; ethers such as diethyl ether, propylene oxide and tetrahydrofuran (THF); N-methylpyrrolidone (NMP) Amides such as dimethylformamide and dimethylacetamide; and aprotic polar solvents such as hexamethylphosphalamide and dimethylsulfoxide.
- amines such as diethylenetriamine and N, N-dimethylaminopropylamine
- ethers such as diethyl ether, propylene oxide and tetrahydrofuran (THF)
- NMP N-methylpyrrolidone
- Amides such as dimethylformamide and dimethylacetamide
- aprotic polar solvents such as hexamethylphosphalamide and dimethylsulfoxide.
- Examples of the material for the positive electrode current collector include metals such as aluminum, titanium, tantalum, stainless steel, and nickel, or metal materials such as alloys thereof; carbon materials such as carbon cloth and carbon paper. Among these, a metal material, particularly aluminum or an alloy thereof is preferable.
- Examples of the shape of the current collector include metal foil, metal cylinder, metal coil, metal plate, metal thin film, expanded metal, punch metal, and foam metal in the case of a metal material.
- a thin film, a carbon cylinder, etc. are mentioned. Of these, metal thin films are preferred.
- the thickness of the thin film is arbitrary, but is usually 1 ⁇ m or more, preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, and usually 1 mm or less, preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less. If the thin film is thinner than this range, the strength required for the current collector may be insufficient. Conversely, if the thin film is thicker than this range, the handleability may be impaired.
- the surface of the current collector is coated with a conductive additive.
- the conductive assistant include noble metals such as carbon, gold, platinum, and silver.
- the ratio of the thickness of the current collector to the positive electrode active material layer is not particularly limited, but the value of (thickness of the positive electrode active material layer on one side immediately before electrolyte injection) / (thickness of the current collector) is 20 Is preferably 15 or less, most preferably 10 or less, and preferably 0.5 or more, more preferably 0.8 or more, and most preferably 1 or more. Above this range, the current collector may generate heat due to Joule heat during high current density charge / discharge. Below this range, the volume ratio of the current collector to the positive electrode active material increases and the battery capacity may decrease.
- the positive electrode may be manufactured by a conventional method.
- the above-mentioned positive electrode active material is added with the above-mentioned binder, thickener, conductive material, solvent, etc. to form a slurry-like positive electrode mixture, which is applied to a current collector, dried and then pressed.
- a method of densification is mentioned.
- the densification can be performed by a hand press, a roller press or the like.
- Density of the positive electrode active material layer is preferably 1.5 g / cm 3 or more, more preferably 2 g / cm 3 or more, still more preferably 2.2 g / cm 3 or more, preferably 5 g / cm 3 or less, More preferably, it is 4.5 g / cm ⁇ 3 > or less, More preferably, it is the range of 4 g / cm ⁇ 3 > or less. If it exceeds this range, the permeability of the electrolyte solution to the vicinity of the current collector / active material interface decreases, and the charge / discharge characteristics particularly at a high current density decrease, and a high output may not be obtained. On the other hand, if it is lower, the conductivity between the active materials is lowered, the battery resistance is increased, and a high output may not be obtained.
- the area of the positive electrode active material layer is larger than the outer surface area of the battery outer case from the viewpoint of increasing the stability at high output and high temperature.
- the sum of the electrode areas of the positive electrode with respect to the surface area of the exterior of the secondary battery is preferably 15 times or more, more preferably 40 times or more.
- the outer surface area of the battery outer case in the case of a square shape with a bottom, is the total area calculated from the vertical, horizontal, and thickness dimensions of the case part filled with the power generation element excluding the protruding part of the terminal.
- the geometric surface area approximates the case portion filled with the power generation element excluding the protruding portion of the terminal as a cylinder.
- the total electrode area of the positive electrode is the geometric surface area of the positive electrode mixture layer facing the mixture layer containing the negative electrode active material, and in the structure in which the positive electrode mixture layer is formed on both sides via the current collector foil. , The sum of the areas where each surface is calculated separately.
- the thickness of the positive electrode plate is not particularly limited, but from the viewpoint of high capacity and high output, the thickness of the mixture layer obtained by subtracting the metal foil thickness of the core material is preferably as a lower limit with respect to one side of the current collector. Is 10 ⁇ m or more, more preferably 20 ⁇ m or more, and preferably 500 ⁇ m or less, more preferably 450 ⁇ m or less.
- Surface adhering substances include aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, boron oxide, antimony oxide, bismuth oxide, lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate And sulfates such as aluminum sulfate, carbonates such as lithium carbonate, calcium carbonate, and magnesium carbonate, and carbon.
- the negative electrode is composed of a negative electrode active material layer containing a negative electrode active material and a current collector.
- the negative electrode material is not particularly limited as long as it can electrochemically occlude and release lithium ions.
- Specific examples include carbon materials, alloy materials, lithium-containing metal composite oxide materials, conductive polymers, and the like. These may be used individually by 1 type, and may be used together combining 2 or more types arbitrarily.
- Examples of the negative electrode active material include carbonaceous materials capable of occluding and releasing lithium, such as organic pyrolysis products and artificial graphite and natural graphite under various pyrolysis conditions; occluding and releasing lithium such as tin oxide and silicon oxide. Possible metal oxide materials; lithium metal; various lithium alloys; lithium-containing metal composite oxide materials. These negative electrode active materials may be used in combination of two or more.
- artificial graphite or purified natural graphite produced by high-temperature treatment of graphitizable pitch obtained from various raw materials, or surface treatment with pitch or other organic substances on these graphite
- carbonized material obtained by carbonizing natural graphite, artificial graphite, artificial carbonaceous material, and artificial graphite material at least once in the range of 400 to 3200 ° C., and a negative electrode active material layer.
- a carbonaceous material comprising at least two kinds of carbonaceous materials having different crystallinity and / or having an interface in contact with the different crystalline carbonaceous materials, and at least two kinds of different orientations of the negative electrode active material layer
- a carbonaceous material having an interface with which the carbonaceous material is in contact is more preferable because of a good balance between initial irreversible capacity and high current density charge / discharge characteristics.
- these carbon materials may be used individually by 1 type, and may use 2 or more types together by arbitrary combinations and a ratio.
- Carbonaceous materials obtained by heat-treating the above-mentioned artificial carbonaceous materials and artificial graphite materials at least once in the range of 400 to 3200 ° C include coal-based coke, petroleum-based coke, coal-based pitch, petroleum-based pitch, and oxidation of these pitches.
- Treated, needle coke, pitch coke and partially carbonized carbon agents, furnace black, acetylene black, pyrolytic products of organic materials such as pitch-based carbon fibers, carbonizable organic materials and their carbides, or carbonizable Examples thereof include solutions obtained by dissolving organic substances in low molecular organic solvents such as benzene, toluene, xylene, quinoline, n-hexane, and carbides thereof.
- the metal material used as the negative electrode active material excluding lithium-titanium composite oxide
- simple lithium, simple metal and alloy forming lithium alloy or oxidation thereof
- Any of compounds such as oxides, carbides, nitrides, silicides, sulfides or phosphides may be used, and there is no particular limitation.
- the single metal and alloy forming the lithium alloy are preferably materials containing group 13 and group 14 metal / metalloid elements, more preferably aluminum, silicon and tin (hereinafter abbreviated as “specific metal elements”). ) Simple metals and alloys or compounds containing these atoms. These may be used individually by 1 type and may use 2 or more types together by arbitrary combinations and a ratio.
- a negative electrode active material having at least one kind of atom selected from a specific metal element, a metal simple substance of any one specific metal element, an alloy composed of two or more specific metal elements, one type or two or more specific types Alloys comprising metal elements and one or more other metal elements, as well as compounds containing one or more specific metal elements, and oxides, carbides, nitrides and silicides of the compounds And composite compounds such as sulfides or phosphides.
- these simple metals, alloys or metal compounds as the negative electrode active material, the capacity of the battery can be increased.
- a compound in which these complex compounds are complexly bonded to several kinds of elements such as a simple metal, an alloy, or a nonmetallic element is also included.
- a simple metal, an alloy, or a nonmetallic element such as silicon and tin
- an alloy of these elements and a metal that does not operate as a negative electrode can be used.
- a complex compound containing 5 to 6 kinds of elements in combination with a metal that acts as a negative electrode other than tin and silicon, a metal that does not operate as a negative electrode, and a nonmetallic element may be used. it can.
- the second constituent element is, for example, at least one of cobalt, iron, magnesium, titanium, vanadium, chromium, manganese, nickel, copper, zinc, gallium, and zirconium.
- the third constituent element is at least one of boron, carbon, aluminum, and phosphorus.
- the metal material simple substance of silicon or tin (which may contain a small amount of impurities), SiO v (0 ⁇ v ⁇ 2), SnO w (0 ⁇ w ⁇ 2), Si—Co—C composite material, Si—Ni—C composite material, Sn—Co—C composite material, and Sn—Ni—C composite material are preferable.
- the lithium-containing metal composite oxide material used as the negative electrode active material is not particularly limited as long as it can occlude and release lithium, but a material containing titanium and lithium is preferable from the viewpoint of high current density charge / discharge characteristics, A lithium-containing composite metal oxide material containing titanium is more preferable, and a composite oxide of lithium and titanium (hereinafter abbreviated as “lithium titanium composite oxide”) is more preferable. That is, it is particularly preferable to use a lithium-titanium composite oxide having a spinel structure in a negative electrode active material for an electrolyte battery because the output resistance is greatly reduced.
- the lithium titanium composite oxide has a general formula: Li x Ti y M z O 4 [Wherein M represents at least one element selected from the group consisting of Na, K, Co, Al, Fe, Ti, Mg, Cr, Ga, Cu, Zn, and Nb. ] It is preferable that it is a compound represented by these.
- compositions of the above compounds are Li 4/3 Ti 5/3 O 4 in (i), Li 1 Ti 2 O 4 in (ii), and Li 4/5 Ti 11/5 O in (iii). 4 .
- structure of Z ⁇ 0, for example, Li 4/3 Ti 4/3 Al 1/3 O 4 is preferable.
- the negative electrode mixture preferably further contains a binder, a thickener, and a conductive material.
- the ratio of the binder to the negative electrode active material is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, particularly preferably 0.6% by mass or more, and preferably 20% by mass or less. It is more preferably at most 10 mass%, further preferably at most 10 mass%, particularly preferably at most 8 mass%.
- the ratio of the binder to the negative electrode active material exceeds the above range, the binder ratio in which the amount of the binder does not contribute to the battery capacity increases, and the battery capacity may be reduced.
- the strength of the negative electrode may be reduced.
- the ratio of the binder to the negative electrode active material is usually 0.1% by mass or more, preferably 0.5% by mass or more. 0.6% by mass or more is more preferable, usually 5% by mass or less, preferably 3% by mass or less, and more preferably 2% by mass or less.
- the ratio to the negative electrode active material is usually 1% by mass or more, preferably 2% by mass or more, and more preferably 3% by mass or more. Preferably, it is usually 15% by mass or less, preferably 10% by mass or less, and more preferably 8% by mass or less.
- the ratio of the thickener to the negative electrode active material is usually 0.1% by mass or more, preferably 0.5% by mass or more, more preferably 0.6% by mass or more, and usually 5% by mass or less, 3 mass% or less is preferable and 2 mass% or less is still more preferable.
- the ratio of the thickener to the negative electrode active material is less than the above range, applicability may be significantly reduced.
- the ratio of the negative electrode active material which occupies for a negative electrode active material layer will fall, and the problem that the capacity
- Examples of the conductive material for the negative electrode include metal materials such as copper and nickel; carbon materials such as graphite and carbon black.
- the solvent for forming the slurry As the solvent for forming the slurry, the negative electrode active material, the binder, and the thickener and conductive material used as necessary can be dissolved or dispersed as long as it is a solvent. There is no restriction, and either an aqueous solvent or an organic solvent may be used. Examples of the aqueous solvent include water and alcohol.
- organic solvent examples include N-methylpyrrolidone (NMP), dimethylformamide, dimethylacetamide, methyl ethyl ketone, cyclohexanone, methyl acetate, methyl acrylate, diethyltriamine, N, N- Examples include dimethylaminopropylamine, tetrahydrofuran (THF), toluene, acetone, diethyl ether, dimethylacetamide, hexamethylphosphalamide, dimethyl sulfoxide, benzene, xylene, quinoline, pyridine, methylnaphthalene, hexane, and the like.
- NMP N-methylpyrrolidone
- dimethylformamide dimethylacetamide
- methyl ethyl ketone cyclohexanone
- methyl acetate methyl acrylate
- diethyltriamine N
- N- Examples include dimethylaminopropylamine, tetrahydr
- Examples of the material of the negative electrode current collector include copper, nickel, and stainless steel. Of these, copper foil is preferable from the viewpoint of easy processing into a thin film and cost.
- the thickness of the current collector is usually 1 ⁇ m or more, preferably 5 ⁇ m or more, and is usually 100 ⁇ m or less, preferably 50 ⁇ m or less. If the thickness of the negative electrode current collector is too thick, the capacity of the entire battery may be reduced too much, and conversely if it is too thin, handling may be difficult.
- the negative electrode may be manufactured by a conventional method.
- the above-described negative electrode material is added with the above-mentioned binder, thickener, conductive material, solvent, etc. to form a slurry, which is applied to a current collector, dried, pressed and densified.
- a method of forming the above-described thin film layer (negative electrode active material layer) containing the negative electrode active material by a technique such as vapor deposition, sputtering, or plating is also used.
- the electrode structure when the negative electrode active material is made into an electrode is not particularly limited, but the density of the negative electrode active material present on the current collector is preferably 1 g ⁇ cm ⁇ 3 or more, and 1.2 g ⁇ cm ⁇ 3 or more. but more preferably, particularly preferably 1.3 g ⁇ cm -3 or more, preferably 2.2 g ⁇ cm -3 or less, more preferably 2.1 g ⁇ cm -3 or less, 2.0 g ⁇ cm -3 or less Further preferred is 1.9 g ⁇ cm ⁇ 3 or less.
- the density of the negative electrode active material present on the current collector exceeds the above range, the negative electrode active material particles are destroyed, increasing the initial irreversible capacity, or the electrolyte solution near the current collector / negative electrode active material interface In some cases, high current density charge / discharge characteristics are deteriorated due to a decrease in permeability.
- the amount is less than the above range, the conductivity between the negative electrode active materials decreases, the battery resistance increases, and the capacity per unit volume may decrease.
- the thickness of the negative electrode plate is designed according to the positive electrode plate to be used, and is not particularly limited.
- the thickness of the mixture layer obtained by subtracting the thickness of the metal foil of the core is usually 15 ⁇ m or more, preferably 20 ⁇ m or more. More preferably, it is 30 ⁇ m or more, and usually 300 ⁇ m or less, preferably 280 ⁇ m or less, more preferably 250 ⁇ m or less.
- Surface adhering substances include aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, boron oxide, antimony oxide, bismuth oxide, lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate And sulfates such as aluminum sulfate and carbonates such as lithium carbonate, calcium carbonate and magnesium carbonate.
- the lithium ion secondary battery according to the present disclosure preferably further includes a separator.
- the material and shape of the separator are not particularly limited as long as they are stable to the electrolytic solution and excellent in liquid retention, and known ones can be used. Among them, a resin, glass fiber, inorganic material, etc., which is formed of a material that is stable with respect to the electrolytic solution of the present disclosure, is used, and a porous sheet or a nonwoven fabric-like material having excellent liquid retention is used. preferable.
- polyolefins such as polyethylene and polypropylene, aromatic polyamides, polytetrafluoroethylene, polyethersulfone, glass filters and the like can be used. These materials, such as a polypropylene / polyethylene two-layer film and a polypropylene / polyethylene / polypropylene three-layer film, may be used alone or in combination of two or more in any combination and ratio.
- the said separator is the porous sheet
- the thickness of the separator is arbitrary, but is usually 1 ⁇ m or more, preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more, and usually 50 ⁇ m or less, preferably 40 ⁇ m or less, more preferably 30 ⁇ m or less. If the separator is too thin than the above range, the insulating properties and mechanical strength may decrease. On the other hand, if it is thicker than the above range, not only battery performance such as rate characteristics may be lowered, but also the energy density of the entire electrolyte battery may be lowered.
- the porosity of the separator is arbitrary, but is usually 20% or more, preferably 35% or more, more preferably 45% or more, Moreover, it is 90% or less normally, 85% or less is preferable and 75% or less is still more preferable. If the porosity is too smaller than the above range, the membrane resistance tends to increase and the rate characteristics tend to deteriorate. Moreover, when larger than the said range, it exists in the tendency for the mechanical strength of a separator to fall and for insulation to fall.
- the average pore diameter of a separator is also arbitrary, it is 0.5 micrometer or less normally, 0.2 micrometer or less is preferable, and it is 0.05 micrometer or more normally. If the average pore diameter exceeds the above range, a short circuit tends to occur. On the other hand, below the above range, the film resistance may increase and the rate characteristics may deteriorate.
- oxides such as alumina and silicon dioxide
- nitrides such as aluminum nitride and silicon nitride
- sulfates such as barium sulfate and calcium sulfate are used. Used.
- a thin film shape such as a non-woven fabric, a woven fabric, or a microporous film is used.
- the thin film shape those having a pore diameter of 0.01 to 1 ⁇ m and a thickness of 5 to 50 ⁇ m are preferably used.
- a separator formed by forming a composite porous layer containing the inorganic particles on the surface layer of the positive electrode and / or the negative electrode using a resin binder can be used.
- a porous layer may be formed by using alumina particles having a 90% particle size of less than 1 ⁇ m on both surfaces of the positive electrode and using a fluororesin as a binder.
- the electrode group has a laminated structure in which the positive electrode plate and the negative electrode plate are interposed through the separator, and a structure in which the positive electrode plate and the negative electrode plate are wound in a spiral shape through the separator. Either is acceptable.
- the ratio of the volume of the electrode group to the internal volume of the battery (hereinafter referred to as the electrode group occupation ratio) is usually 40% or more, preferably 50% or more, and usually 90% or less, preferably 80% or less. .
- the battery capacity decreases. Also, if the above range is exceeded, the void space is small, the battery expands, and the member expands or the vapor pressure of the electrolyte liquid component increases and the internal pressure rises. In some cases, a gas release valve that lowers various characteristics such as storage at high temperature and the like, or releases the internal pressure to the outside is activated.
- the current collecting structure is not particularly limited, but in order to more effectively realize the high current density charge / discharge characteristics with the electrolytic solution of the present disclosure, a structure in which the resistance of the wiring portion or the joint portion is reduced is used. preferable. Thus, when internal resistance is reduced, the effect using the electrolyte solution of this indication is exhibited especially favorable.
- the electrode group has the above laminated structure
- a structure formed by bundling the metal core portions of the electrode layers and welding them to the terminals is preferably used.
- the internal resistance increases. Therefore, it is also preferable to provide a plurality of terminals in the electrode to reduce the resistance.
- the electrode group has the winding structure described above, the internal resistance can be lowered by providing a plurality of lead structures for the positive electrode and the negative electrode, respectively, and bundling the terminals.
- the material of the outer case is not particularly limited as long as it is a material that is stable with respect to the electrolytic solution used. Specifically, a nickel-plated steel plate, stainless steel, aluminum, an aluminum alloy, a metal such as a magnesium alloy, or a laminated film (laminate film) of a resin and an aluminum foil is used. From the viewpoint of weight reduction, an aluminum or aluminum alloy metal or a laminate film is preferably used.
- the metal is welded together by laser welding, resistance welding, or ultrasonic welding to form a sealed sealed structure, or a caulking structure using the above metals via a resin gasket. Things.
- the outer case using the laminate film include a case where a resin-sealed structure is formed by heat-sealing resin layers.
- a resin different from the resin used for the laminate film may be interposed between the resin layers.
- a resin layer is heat-sealed through a current collecting terminal to form a sealed structure, a metal and a resin are joined, so that a resin having a polar group or a modified group having a polar group introduced as an intervening resin is used.
- Resins are preferably used.
- the shape of the lithium ion secondary battery of the present disclosure is arbitrary, and examples thereof include a cylindrical shape, a square shape, a laminate shape, a coin shape, and a large shape.
- the shape and structure of a positive electrode, a negative electrode, and a separator can be changed and used according to the shape of each battery.
- a module including the lithium ion secondary battery of the present disclosure is also one of the present disclosure.
- the positive electrode includes a positive electrode, a negative electrode, and the above-described electrolyte solution.
- the positive electrode includes a positive electrode current collector and a positive electrode active material layer including a positive electrode active material.
- the positive electrode active material includes Mn.
- a lithium ion secondary battery is also a preferred embodiment. Since the positive electrode active material layer containing the positive electrode active material containing Mn is provided, the lithium ion secondary battery is more excellent in high temperature storage characteristics.
- LiMn 1.5 Ni 0.5 O 4 , LiNi 0.5 Co 0.2 Mn 0 has a high energy density and can provide a high-power lithium ion secondary battery. .3 O 2 and LiNi 0.6 Co 0.2 Mn 0.2 O 2 are preferred.
- the content of the positive electrode active material in the positive electrode active material layer is preferably 80% by mass or more, more preferably 82% by mass or more, and particularly preferably 84% by mass or more. Moreover, an upper limit becomes like this. Preferably it is 99 mass% or less, More preferably, it is 98 mass% or less. If the content of the positive electrode active material in the positive electrode active material layer is low, the electric capacity may be insufficient. Conversely, if the content is too high, the strength of the positive electrode may be insufficient.
- the positive electrode active material layer may further include a conductive material, a thickener, and a binder.
- any material can be used as long as it is a material that is safe with respect to the solvent and the electrolyte used in the production of the electrode.
- the content of the binder is usually 0.1% by mass or more, preferably 1% by mass or more, more preferably 1.5% by mass or more, as a ratio of the binder in the positive electrode active material layer. Usually, it is 80 mass% or less, Preferably it is 60 mass% or less, More preferably, it is 40 mass% or less, Most preferably, it is 10 mass% or less.
- the ratio of the binder is too low, the positive electrode active material cannot be sufficiently retained and the positive electrode has insufficient mechanical strength, which may deteriorate battery performance such as cycle characteristics. On the other hand, if it is too high, battery capacity and conductivity may be reduced.
- thickener examples include carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, ethylcellulose, polyvinyl alcohol, oxidized starch, phosphorylated starch, casein, and salts thereof. 1 type may be used independently or 2 or more types may be used together by arbitrary combinations and a ratio.
- the ratio of the thickener to the active material is usually 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and usually 5% by mass or less, preferably 3%. It is in the range of not more than mass%, more preferably not more than 2 mass%. Below this range, applicability may be significantly reduced. If it exceeds, the ratio of the active material in the positive electrode active material layer may decrease, and there may be a problem that the capacity of the battery decreases and a problem that the resistance between the positive electrode active materials increases.
- a known conductive material can be arbitrarily used as the conductive material.
- Specific examples include metal materials such as copper and nickel, graphite such as natural graphite and artificial graphite, carbon black such as acetylene black, and carbon materials such as amorphous carbon such as needle coke. In addition, these may be used individually by 1 type and may use 2 or more types together by arbitrary combinations and a ratio.
- the conductive material is usually 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 1% by mass or more, and usually 50% by mass or less, preferably 30% by mass in the positive electrode active material layer. % Or less, more preferably 15% by mass or less. If the content is lower than this range, the conductivity may be insufficient. Conversely, if the content is higher than this range, the battery capacity may decrease.
- the positive electrode current collector is preferably composed of a valve metal or an alloy thereof because the high-temperature storage characteristics are further improved.
- the valve metal include aluminum, titanium, tantalum, and chromium. More preferably, the positive electrode current collector is made of aluminum or an aluminum alloy.
- the high-temperature storage characteristics are further improved, so that the portion in contact with the electrolytic solution among the portions electrically connected to the positive electrode current collector is also made of a valve metal or an alloy thereof. It is preferable to be configured.
- the battery outer case, and the lead wire and safety valve accommodated in the battery outer case, which are electrically connected to the positive electrode current collector and in contact with the non-aqueous electrolyte are valve metal or It is preferable to comprise the alloy. Stainless steel coated with a valve metal or an alloy thereof may be used.
- the method for producing the positive electrode is as described above.
- the above-described positive electrode active material is added with the above-described binder, thickener, conductive material, solvent and the like to obtain a slurry-like positive electrode mixture, which is described above.
- coating to a positive electrode electrical power collector, drying, and pressing and densifying is mentioned.
- the configuration of the negative electrode is as described above.
- the electric double layer capacitor may include a positive electrode, a negative electrode, and the electrolytic solution described above.
- at least one of the positive electrode and the negative electrode is a polarizable electrode, and the following electrodes described in detail in JP-A-9-7896 can be used as the polarizable electrode and the nonpolarizable electrode.
- the polarizable electrode mainly composed of activated carbon used in the present disclosure preferably includes a non-activated carbon having a large specific surface area and a conductive agent such as carbon black imparting electron conductivity.
- the polarizable electrode can be formed by various methods.
- a polarizable electrode made of activated carbon and carbon black can be formed by mixing activated carbon powder, carbon black, and a phenolic resin, and firing and activating in an inert gas atmosphere and a water vapor atmosphere after press molding.
- the polarizable electrode is joined to the current collector with a conductive adhesive or the like.
- activated carbon powder, carbon black, and a binder can be kneaded in the presence of alcohol, formed into a sheet, and dried to form a polarizable electrode.
- a polarizable electrode For example, polytetrafluoroethylene is used as the binder.
- activated carbon powder, carbon black, binder and solvent are mixed to form a slurry, and this slurry is coated on the metal foil of the current collector and dried to obtain a polarizable electrode integrated with the current collector. it can.
- An electric double layer capacitor may be formed by using a polarizable electrode mainly composed of activated carbon for both electrodes, but a configuration using a non-polarizable electrode on one side, for example, a positive electrode mainly composed of a battery active material such as a metal oxide, and activated carbon
- a positive electrode mainly composed of a battery active material such as a metal oxide such as a metal oxide
- activated carbon A structure combining a polarizable electrode negative electrode mainly composed of carbon, a negative electrode mainly composed of a carbon material capable of reversibly occluding and releasing lithium ions, or a negative electrode composed mainly of lithium metal or lithium alloy and activated carbon.
- a configuration combining a positive electrode with a polarity is also possible.
- carbonaceous materials such as carbon black, graphite, expanded graphite, porous carbon, carbon nanotube, carbon nanohorn, and ketjen black may be used instead of or in combination with activated carbon.
- the non-polarizable electrode is preferably composed mainly of a carbon material capable of reversibly occluding and releasing lithium ions, and an electrode obtained by occluding lithium ions in this carbon material is used for the electrode.
- a lithium salt is used as the electrolyte. According to the electric double layer capacitor having this configuration, a higher withstand voltage exceeding 4 V can be obtained.
- Solvents used to prepare the slurry for electrode preparation are preferably those that dissolve the binder.
- Dimethyl acid, ethanol, methanol, butanol or water is appropriately selected.
- Examples of the activated carbon used for the polarizable electrode include phenol resin activated carbon, coconut shell activated carbon, petroleum coke activated carbon and the like. Among these, it is preferable to use petroleum coke activated carbon or phenol resin activated carbon in that a large capacity can be obtained.
- Activated carbon activation treatment methods include a steam activation treatment method, a molten KOH activation treatment method, and the like, and it is preferable to use activated carbon by a molten KOH activation treatment method in terms of obtaining a larger capacity.
- Preferred conductive agents used for the polarizable electrode include carbon black, ketjen black, acetylene black, natural graphite, artificial graphite, metal fiber, conductive titanium oxide, and ruthenium oxide.
- the mixing amount of the conductive agent such as carbon black used for the polarizable electrode is so as to obtain good conductivity (low internal resistance), and if it is too large, the product capacity is reduced. It is preferable to set it as 50 mass%.
- activated carbon As the activated carbon used for the polarizable electrode, activated carbon having an average particle size of 20 ⁇ m or less and a specific surface area of 1500 to 3000 m 2 / g is used so that an electric double layer capacitor having a large capacity and a low internal resistance can be obtained. Is preferred.
- a preferable carbon material for constituting an electrode mainly composed of a carbon material capable of reversibly inserting and extracting lithium ions natural graphite, artificial graphite, graphitized mesocarbon spherule, graphitized whisker, gas layer Examples include a grown carbon fiber, a fired product of furfuryl alcohol resin, and a fired product of novolac resin.
- the current collector is only required to be chemically and electrochemically corrosion resistant.
- As the current collector of the polarizable electrode mainly composed of activated carbon stainless steel, aluminum, titanium or tantalum can be preferably used. Of these, stainless steel or aluminum is a particularly preferable material in terms of both characteristics and cost of the obtained electric double layer capacitor.
- As the current collector of the electrode mainly composed of a carbon material capable of reversibly inserting and extracting lithium ions stainless steel, copper or nickel is preferably used.
- lithium ions in order to preliminarily store lithium ions in a carbon material capable of reversibly inserting and extracting lithium ions, (1) mixing powdered lithium with a carbon material capable of reversibly inserting and extracting lithium ions. (2) A lithium foil is placed on an electrode formed of a carbon material capable of reversibly occluding and releasing lithium ions and a binder, and the electrode is in contact with the lithium salt.
- the electric double layer capacitor As the electric double layer capacitor, a wound type electric double layer capacitor, a laminate type electric double layer capacitor, a coin type electric double layer capacitor, etc. are generally known, and the electric double layer capacitor can also be in these types. .
- a positive electrode and a negative electrode made of a laminate (electrode) of a current collector and an electrode layer are wound through a separator to produce a wound element, and the wound element is made of aluminum. And then filled with an electrolytic solution, preferably a non-aqueous electrolytic solution, and then sealed and sealed with a rubber sealing body.
- separator conventionally known materials and structures can be used.
- a polyethylene porous membrane, polytetrafluoroethylene, polypropylene fiber, glass fiber, cellulose fiber nonwoven fabric, and the like can be given.
- a laminate type electric double layer capacitor in which a sheet-like positive electrode and a negative electrode are laminated via an electrolytic solution and a separator, and a positive electrode and a negative electrode are formed into a coin shape by fixing with a gasket and the electrolytic solution and the separator
- a configured coin type electric double layer capacitor can also be used.
- the electrolytic solution of the present disclosure is useful as an electrolytic solution for a large-sized lithium ion secondary battery for a hybrid vehicle or a distributed power source, or an electric double layer capacitor.
- the structure of the compound obtained in the synthesis example was identified by 1H or 19F-NMR.
- Synthesis example 1 ⁇ Synthesis of lithium diallylsulfamate (Compound A)> Lithium chloride (3.0 g, 71 mmol) and dimethyl carbonate (60 mL) were added to the reaction vessel, and chlorosulfonic acid (9.1 g, 78 mmol) was added dropwise thereto. The solution was stirred at 80 ° C. for 1 hour and then cooled to room temperature, and a mixed solution of diallylamine (8.3 g, 85 mmol) and triethylamine (8.6 g, 85 mmol) was added dropwise in an ice water bath (reaction solution temperature rise). 5-10 ° C., dropping time 5-10 minutes).
- the solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired crude diallyl sulfamate (8.7 g).
- the obtained crude lithium diallylsulfamate (8.7 g) was dissolved in 14 mL of methanol at 60 ° C., 14 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume was halved. Again, 14 mL of dimethyl carbonate was added and the mixture was concentrated under reduced pressure. When a solid was precipitated, the concentration under reduced pressure was stopped, and the mixture was filtered and washed with dimethyl carbonate to obtain the desired lithium diallylsulfamate (3.5 g, 19 mmol, total yield 27%). It was.
- Synthesis example 2 ⁇ Synthesis of lithium dipropargyl sulfamate (Compound B)> Lithium chloride (3.0 g, 71 mmol) and dimethyl carbonate (60 mL) were added to the reaction vessel, and chlorosulfonic acid (9.1 g, 78 mmol) was added dropwise thereto. The solution was stirred at 80 ° C. for 1 hour and then cooled to room temperature, and a mixed solution of dipropargylamine (7.9 g, 85 mmol) and triethylamine (8.6 g, 85 mmol) was added dropwise in an ice water bath (reaction solution). Temperature rise 5-10 ° C., dropping time 5-10 minutes).
- the solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired lithium dipropargylsulfamate (7.1 g).
- the obtained crude lithium dipropargyl sulfamate (7.1 g) was dissolved in 14 mL of methanol at 60 ° C., 14 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume was reduced to half. Again, 14 mL of dimethyl carbonate was added and concentrated under reduced pressure. When a solid was precipitated, the concentration under reduced pressure was stopped, filtration and dimethyl carbonate were washed to obtain the target lithium dipropargyl sulfamate (3.2 g, 18 mmol, total yield 25%). Obtained.
- Synthesis example 3 ⁇ Synthesis of lithium pentane-1,5-diylsulfamate (Compound C)> Lithium chloride (3.0 g, 71 mmol) and dimethyl carbonate (60 mL) were added to the reaction vessel, and chlorosulfonic acid (9.1 g, 78 mmol) was added dropwise thereto. The solution was stirred at 80 ° C. for 1 hour, cooled to room temperature, and a mixed solution of piperidine (7.2 g, 85 mmol) and triethylamine (8.6 g, 85 mmol) was added dropwise in an ice-water bath (reaction solution temperature rise). 5-10 ° C., dropping time 5-10 minutes).
- the solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired lithium pentane-1,5-diylsulfamate (10.3 g).
- the obtained lithium pentane-1,5-diylsulfamate (10.3 g) was dissolved in 16 mL of methanol at 60 ° C., 16 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume was reduced to half. Add 16 mL of dimethyl carbonate again and concentrate under reduced pressure. When a solid precipitates, stop concentration under reduced pressure, filter, wash with dimethyl carbonate, and wash the target pentane-1,5-diylsulfamate (4.7 g, 27 mmol, total yield). 39%).
- Synthesis example 4 ⁇ Synthesis of lithium butane-1,4-diylsulfamate (compound D)> Lithium chloride (3.0 g, 71 mmol) and dimethyl carbonate (60 mL) were added to the reaction vessel, and chlorosulfonic acid (9.1 g, 78 mmol) was added dropwise thereto. The solution was stirred at 80 ° C. for 1 hour and then cooled to room temperature, and a mixed solution of pyrrolidine (6.0 g, 85 mmol) and triethylamine (8.6 g, 85 mmol) was added dropwise in an ice water bath (reaction solution temperature rise). 5-10 ° C., dropping time 5-10 minutes).
- Synthesis example 5 ⁇ Synthesis of lithium methyl 2,2,2-trifluoroethylsulfamate (Compound E)> Lithium chloride (1.0 g, 24 mmol) and dimethyl carbonate (35 mL) were added to the reaction vessel, and chlorosulfonic acid (3.0 g, 26 mmol) was added dropwise thereto. The solution was stirred at 80 ° C. for 1 hour, cooled to room temperature, and methyl 2,2,2-trifluoroethylamine (6.4 g, 57 mmol) was added dropwise in an ice-water bath (reaction temperature rise 0-5). C., dropping time about 5 minutes).
- Synthesis example 7 ⁇ Synthesis of lithium bis (2,2,3,3,3-pentafluoropropyl) sulfamate (Compound G)> Lithium chloride (1.0 g, 24 mmol) and dimethyl carbonate (35 mL) were added to the reaction vessel, and chlorosulfonic acid (3.0 g, 26 mmol) was added dropwise thereto. The solution was stirred at 80 ° C. for 1 hour and then cooled to room temperature, and bis (2,2,3,3,3-pentafluoropropyl) amine (13.3 g, 57 mmol) was added dropwise in an ice-water bath ( The reaction solution temperature rose 0 to 5 ° C., and the dropping time was about 5 minutes).
- Synthesis example 8 ⁇ Synthesis of Lithium Bis (2-fluoroallyl) sulfamate (Compound H)> Lithium chloride (3.0 g, 71 mmol) and dimethyl carbonate (60 mL) were added to the reaction vessel, and chlorosulfonic acid (9.1 g, 78 mmol) was added dropwise thereto. The solution was stirred at 80 ° C. for 1 hour and then cooled to room temperature, and a mixed solution of bis (2-fluoroallyl) amine (11.3 g, 85 mmol) and triethylamine (8.6 g, 85 mmol) was placed in an ice-water bath.
- the solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired lithium 3-oxapentane-1,5-diylsulfamate (12.5 g).
- the obtained crude lithium 3-oxapentane-1,5-diylsulfamate (12.5 g) was dissolved in 140 mL of methanol at 60 ° C., 100 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume was reduced to half. Add 100 mL of dimethyl carbonate again and concentrate under reduced pressure.
- the solution was added dropwise (reaction temperature rise 5-10 ° C., dropping time 5-10 minutes). The solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired lithium bis (2-methoxyethyl)) sulfamate (8.3 g).
- the obtained crude lithium bis (2-methoxyethyl) sulfamate (8.3 g) was dissolved in 16 mL of methanol at 60 ° C., 16 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume was reduced to half. Add 16 mL of dimethyl carbonate again and concentrate under reduced pressure. When a solid is precipitated, stop concentration under reduced pressure, filter and wash with dimethyl carbonate to obtain the target lithium bis (2-methoxyethyl) sulfamate (4.0 g, 18 mmol, total yield). 26%).
- reaction solution was added dropwise (reaction solution temperature increase 5 to 10 ° C., dropping time 5 to 10 minutes).
- the solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired lithium bis (2-trifluoromethoxyethyl)) sulfamate (6.5 g).
- the obtained crude lithium bis (2-trifluoromethoxyethyl) sulfamate (6.5 g) was dissolved in 16 mL of methanol at 60 ° C., 16 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume became half. Again, 16 mL of dimethyl carbonate was added, and the mixture was concentrated under reduced pressure.
- the solution was added dropwise (reaction temperature rise 5-10 ° C., dropping time 5-10 minutes). The solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired lithium bis (2-trifluoromethoxyethyl) sulfamate (10.2 g).
- the obtained crude lithium bis (3-pyridylmethyl) sulfamate (10.2 g) was dissolved in 20 mL of methanol at 60 ° C., 20 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume was reduced to half. Add 20 mL of dimethyl carbonate again and concentrate under reduced pressure. When a solid is precipitated, stop concentration under reduced pressure, filter, wash with dimethyl carbonate, and wash the desired lithium bis (3-pyridylmethyl) sulfamate (6.4 g, 22 mmol, total yield). 32%).
- the solution was stirred at room temperature for 1 hour, then filtered and washed with dichloromethane to obtain the desired crude lithium diethylsulfamate (9.1 g).
- the obtained crude lithium diethylsulfamate (2.0 g) was dissolved in 7 mL of methanol at 60 ° C., 7 mL of dimethyl carbonate was added thereto, and the mixture was concentrated under reduced pressure until the volume became half. Add 7 mL of dimethyl carbonate again and concentrate under reduced pressure. When a solid is precipitated, stop concentration under reduced pressure, filter, and wash with dimethyl carbonate to obtain the desired lithium diethylsulfamate (0.9 g, 6 mmol, total yield 38%). It was.
- Examples 1 to 24 LiPF 6 was added to a mixture of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (volume ratio 30:70) to a concentration of 1.0 mol / liter to obtain a basic electrolyte. Furthermore, the additive compound (I) shown in Table 1 was added to the basic electrolyte so as to have the content shown in Table 1 to obtain a non-aqueous electrolyte. In addition, content of each additive compound in each table
- Example 4 it prepared without adding the compound A and obtained the non-aqueous electrolyte.
- Example 4 In place of Compound A, Compound X was added so as to have the content shown in Table 1 to obtain a nonaqueous electrolytic solution.
- Example 4 in place of Compound A, Compound Y was added so as to have the content shown in Table 1 to obtain a nonaqueous electrolytic solution.
- Examples 25-33 LiPF 6 was added to a mixture of EC, EMC, and ethyl propionate (volume ratio 30:40:30) to a concentration of 1.0 mol / liter to obtain a basic electrolyte. Furthermore, the additive compound (I) shown in Table 2 was added to the basic electrolyte so as to have the content shown in Table 2 to obtain a non-aqueous electrolyte.
- Example 25 it prepared without adding the compound A and obtained the non-aqueous electrolyte.
- Examples 34-42 LiPF 6 was added to a mixture of fluoroethylene carbonate (FEC) and methyl 2,2,2-trifluoroethyl carbonate (volume ratio 30:70) to a concentration of 1.0 mol / liter, did. Furthermore, the additive compound (I) shown in Table 3 was added to the basic electrolyte so as to have the content shown in Table 3 to obtain a non-aqueous electrolyte.
- FEC fluoroethylene carbonate
- methyl 2,2,2-trifluoroethyl carbonate volume ratio 30:70
- Example 34 it prepared without adding the compound A and obtained the non-aqueous electrolyte.
- Examples 43-51 LiPF 6 was added to a mixture of trifluoropropylene carbonate and methyl 2,2,2-trifluoroethyl carbonate (volume ratio 30:70) to a concentration of 1.0 mol / liter to obtain a basic electrolyte. Furthermore, the additive compound (I) described in Table 4 was added to the basic electrolyte so as to have the content described in Table 4 to obtain a non-aqueous electrolyte.
- Example 43 it prepared without adding the compound A and obtained the non-aqueous electrolyte.
- Examples 52-60 LiPF 6 was added to a mixture of trifluoropropylene carbonate and methyl difluoroacetate (volume ratio 30:70) to a concentration of 1.0 mol / liter to obtain a basic electrolytic solution. Furthermore, the additive compound (I) shown in Table 5 was added to this basic electrolyte so as to have the content shown in Table 5 to obtain a non-aqueous electrolyte.
- Example 52 it prepared without adding the compound A and obtained the non-aqueous electrolyte.
- Examples 61-69 LiPF 6 was added to a mixture of fluoroethylene carbonate (FEC) and methyl difluoroacetate (volume ratio 30:70) to a concentration of 1.0 mol / liter to obtain a basic electrolyte. Furthermore, the additive compound (I) shown in Table 6 was added to the basic electrolyte so as to have the content shown in Table 6 to obtain a non-aqueous electrolyte.
- FEC fluoroethylene carbonate
- methyl difluoroacetate volume ratio 30:70
- Example 61 it prepared without adding the compound A and obtained the non-aqueous electrolyte.
- Examples 70-78 LiPF 6 was added to a mixture of fluoroethylene carbonate (FEC) and methyl 3,3,3-trifluoropropionate (volume ratio 30:70) to a concentration of 1.0 mol / liter, did. Furthermore, the additive compound (I) shown in Table 7 was added to this basic electrolyte so as to have the content shown in Table 7 to obtain a non-aqueous electrolyte.
- FEC fluoroethylene carbonate
- methyl 3,3,3-trifluoropropionate volume ratio 30:70
- Example 70 it prepared without adding the compound A and obtained the non-aqueous electrolyte.
- Examples 79-87 LiPF 6 was added to a mixture of fluoroethylene carbonate (FEC) and 2,2,2-trifluoroethyl acetate (volume ratio 30:70) to a concentration of 1.0 mol / liter to obtain a basic electrolyte. . Furthermore, the additive compound (I) shown in Table 8 was added to this basic electrolyte so as to have the content shown in Table 8 to obtain a non-aqueous electrolyte.
- FEC fluoroethylene carbonate
- 2,2,2-trifluoroethyl acetate volume ratio 30:70
- Example 79 it was prepared without adding Compound A to obtain a nonaqueous electrolytic solution.
- Li (Ni 1/3 Mn 1/3 Co 1/3 ) O 2 (LNMC) 93% by mass as a positive electrode active material and acetylene black as a conductive material 3% by mass and 4% by mass of polyvinylidene fluoride (PVdF) as a binder were mixed in an N-methylpyrrolidone solvent to form a slurry.
- the obtained slurry was applied to one side of a 15 ⁇ m-thick aluminum foil previously coated with a conductive additive, dried, and roll-pressed with a press machine, and the active material layer had a width of 50 mm and a length of A positive electrode was cut out into a shape having an uncoated portion of 30 mm, a width of 5 mm, and a length of 9 mm.
- positive electrodes were produced in the same manner as described above except that LiMn 1.5 Ni 0.5 O 4 (LNMO) was used as the positive electrode active material.
- the active material layer size was 52 mm in width, 32 mm in length, 5 mm in width, and 9 mm in length. It cut out into the shape which has a part, and was set as the negative electrode.
- [Production of negative electrode] In the examples and comparative examples described in Table 2, 93 parts by mass of carbonaceous material (graphite) and 5 parts by mass of silicon were used. %) And 1 part by weight of an aqueous dispersion of styrene-butadiene rubber (concentration of styrene-butadiene rubber 50% by weight) were added and mixed with a disperser to form a slurry.
- the obtained slurry was applied to a copper foil having a thickness of 10 ⁇ m, dried, and rolled with a press.
- the active material layer size was 52 mm in width, 32 mm in length, 5 mm in width, and 9 mm in length. It cut out into the shape which has a part, and was set as the negative electrode.
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Abstract
Description
また、本開示は、新規なスルファミン酸リチウム化合物を提供することも目的とする。
一般式(1):
-H、
-F、
式:-Op101-(SiR103 2O)n101-SiR104 3(R103及びR104は、互いに独立に、一つ以上の水素がフッ素に置換されていてもよいアルキル基、一つ以上の水素がフッ素に置換されていてもよいアルケニル基、一つ以上の水素がフッ素に置換されていてもよいアルキニル基又は一つ以上の水素がフッ素に置換されていてもよいアリール基、n101は0以上の整数であり、p101は0又は1である。)で示される基、
炭素数1~7のアルキル基、
炭素数2~7のアルケニル基、
炭素数2~7のアルキニル基、
炭素数6~15のアリール基、
-SO2X101(X101は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、
-SO3X102(X102は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、又は、
R101とR102が結合して環状構造を形成し該環状構造中に多重結合を含んでもよい炭素数2~7の炭化水素基である置換基であって、
上記置換基はそれらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
但し、R101及びR102の両方がアルキル基である場合は、少なくとも一方がその構造中に一つ以上の2~6価のヘテロ原子を含む、又は、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されている。)
一般式(1-1):
-H、
-F、
式:-Op101-(SiR103 2O)n101-SiR104 3(R103及びR104は、互いに独立に、一つ以上の水素がフッ素に置換されていてもよいアルキル基、一つ以上の水素がフッ素に置換されていてもよいアルケニル基、一つ以上の水素がフッ素に置換されていてもよいアルキニル基又は一つ以上の水素がフッ素に置換されていてもよいアリール基、n101は0以上の整数であり、p101は0又は1である。)で示される基、
炭素数1~7のアルキル基、
炭素数2~7のアルケニル基、
炭素数2~7のアルキニル基、
炭素数6~15のアリール基、
-SO2X101(X101は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、又は、
-SO3X102(X102は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)である置換基であって、
前記置換基はそれらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
但し、R201及びR202の少なくとも一方は-Fである。)
また、本開示によれば、新規なスルファミン酸リチウム化合物を提供することもできる。
一般式(1):
-H、
-F、
式:-Op101-(SiR103 2O)n101-SiR104 3(R103及びR104は、互いに独立に、一つ以上の水素がフッ素に置換されていてもよいアルキル基、一つ以上の水素がフッ素に置換されていてもよいアルケニル基、一つ以上の水素がフッ素に置換されていてもよいアルキニル基又は一つ以上の水素がフッ素に置換されていてもよいアリール基、n101は0以上の整数であり、p101は0又は1である。)で示される基、
炭素数1~7のアルキル基、
炭素数2~7のアルケニル基、
炭素数2~7のアルキニル基、
炭素数6~15のアリール基、
-SO2X101(X101は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、
-SO3X102(X102は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、又は、
R101とR102が結合して環状構造を形成し該環状構造中に多重結合を含んでもよい炭素数2~7の炭化水素基である置換基であって、
上記置換基はそれらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
但し、R101及びR102の両方がアルキル基である場合は、少なくとも一方がその構造中に一つ以上の2~6価のヘテロ原子を含む、又は、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されている。)
本開示の電解液は、上記特徴を有することにより、抵抗が低い電気化学デバイスを与えることができる。
本開示の電解液は、また、高温保存特性に優れる(例えば、高温保存後のガス発生量が少なく、容量維持率が高い)電気化学デバイスを与えることもできる。
上記置換基は、それらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
上記置換基が有していてもよい官能基としては、例えば、フェニル基、アニシル基、ベンジル基、シアノ基、トリアルキルシリル基(アルキル基の炭素数は1~4であることが好ましい。)、-SO2X103(X103は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、一つ以上の水素がフッ素に置換されていてもよい炭素数1~7のアルキル基、炭素数1~7の飽和複素環基、又は、炭素数1~7のアルコキシ基が好ましい。上記X103におけるアルキル基の炭素数は、例えば、1~10である。
R101及びR102の両方が上記アルキル基である場合、少なくとも一方はその構造中に一つ以上の上記ヘテロ原子を含むか、又は、一つ以上の水素がフッ素又は上記官能基に置換されている必要がある。
上記R103及びR104において、一つ以上の水素がフッ素に置換されていてもよいアルキル基は、炭素数が1~10であることが好ましく、1~7であることがより好ましい。
一つ以上の水素がフッ素に置換されていてもよいアルケニル基及びアルキニル基は、炭素数が2~10であることが好ましく、2~7であることがより好ましい。
一つ以上の水素がフッ素に置換されていてもよいアリール基は、炭素数が6~8であることが好ましく、6~7であることがより好ましい。
上記式において、n101は0以上の整数であり、2000以下が好ましく、0~100の整数であることがより好ましく、0~10であることが更に好ましい。
一般式(1-1):
-H、
-F、
式:-Op101-(SiR103 2O)n101-SiR104 3(R103及びR104は、互いに独立に、一つ以上の水素がフッ素に置換されていてもよいアルキル基、一つ以上の水素がフッ素に置換されていてもよいアルケニル基、一つ以上の水素がフッ素に置換されていてもよいアルキニル基又は一つ以上の水素がフッ素に置換されていてもよいアリール基、n101は0以上の整数であり、p101は0又は1である。)で示される基、
炭素数1~7のアルキル基、
炭素数2~7のアルケニル基、
炭素数2~7のアルキニル基、
炭素数6~15のアリール基、
-SO2X101(X101は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、又は、
-SO3X102(X102は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)である置換基であって、
前記置換基はそれらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
但し、R201及びR202の少なくとも一方は-Fである。)
一般式(1-1)におけるR201及びR202としての上記-Op101-(SiR103 2O)n101-SiR104 3、上記アルキル基、上記アルケニル基、上記アルキニル基、上記アリール基、上記-SO2X101及び上記-SO3X102としては、一般式(1)におけるR101及びR102と同様のものが挙げられる。
上記アミン類としては、例えば、トリエチルアミン、トリ(n-プロピル)アミン、トリ(n-ブチル)アミン、ジイソプロピルエチルアミン、シクロヘキシルジメチルアミン、ピリジン、ルチジン、γ-コリジン、N,N-ジメチルアニリン、N-メチルピペリジン、N-メチルピロリジン、N-メチルモルホリン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン(DBU)、1,5-ジアザビシクロ[4.3.0]-5-ノネン、1,4-ジアザビシクロ[2.2.2]オクタン(DABCO)、4-ジメチルアミノピリジン(DMAP)、プロトンスポンジ等が挙げられる。
上記無機塩基としては、例えば、水酸化リチウム、水酸化カリウム、水酸化ナトリウム、水酸化カルシウム、炭酸リチウム、炭酸ナトリウム、炭酸カリウム、炭酸水素ナトリウム、炭酸水素カリウム、炭酸セシウム、炭酸水素セシウム、炭酸水素リチウム、フッ化セシウム、フッ化カリウム、フッ化ナトリウム、塩化リチウム、臭化リチウム等が挙げられる。
上記塩基としては、なかでも、上記アミン類が好ましい。上記アミン類としてはトリエチルアミン又はピリジンが好ましい。
上記塩基は、常温で固体であってもよいし、液体であってもよい。固体である場合には、溶媒に溶かして使用することができる。
また、化合物(a)及び(b)が溶解する非水溶媒が好ましい。例えば、室温における化合物(a)の溶解度が0.1質量%以上が好ましく、1質量%以上がより好ましく、5質量%以上が更に好ましい。
また、室温における化合物(b)の溶解度が0.1質量%以上が好ましく、1質量%以上がより好ましく、5質量%以上が更に好ましい。
また、目的の化合物(1)に残留しにくいことから、上記溶媒の沸点は、常圧にて300℃以下が好ましく、200℃以下がより好ましく、150℃以下が更に好ましい。
また、化合物(c)が溶解する非プロトン性溶媒が好ましい。例えば、室温における化合物(c)の溶解度が0.1質量%以上が好ましく、1質量%以上がより好ましく、5質量%以上が更に好ましい。
また、目的の化合物(1)に残留しにくいことから、上記溶媒の沸点は、常圧にて300℃以下が好ましく、200℃以下がより好ましく、150℃以下が更に好ましい。
工程(2)と工程(1)とを同じ溶媒中で連続して行う場合には上記の回収する工程や精製工程は不要である。
また、化合物(c)及び(d)が溶解する非水溶媒が好ましい。例えば、室温における化合物(c)の溶解度が0.1質量%以上が好ましく、1質量%以上がより好ましく、5質量%以上が更に好ましい。
また、室温における化合物(d)の溶解度が0.1質量%以上が好ましく、1質量%以上がより好ましく、5質量%以上が更に好ましい。
また、本開示の製造方法で得られるスルファミン酸リチウムに残留しにくいことから、上記溶媒の沸点は、常圧にて300℃以下が好ましく、200℃以下がより好ましく、150℃以下が更に好ましい。
-H、
式:-Op101-(SiR103 2O)n101-SiR104 3(R103及びR104は、互いに独立に、一つ以上の水素がフッ素に置換されていてもよいアルキル基、一つ以上の水素がフッ素に置換されていてもよいアルケニル基、一つ以上の水素がフッ素に置換されていてもよいアルキニル基又は一つ以上の水素がフッ素に置換されていてもよいアリール基、n101は0以上の整数であり、p101は0又は1である。)で示される基、
炭素数1~7のアルキル基、
炭素数2~7のアルケニル基、
炭素数2~7のアルキニル基、
炭素数6~15のアリール基、
-SO2X101(X101は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、又は、
-SO3X102(X102は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)である置換基であって、
上記置換基はそれらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
但し、R211及びR212の少なくとも一方は一つ以上の水素を有する。)で表される化合物(g)とリチウム源とフッ素を含む混合ガスとを反応させて、化合物(1-1)又は化合物(1-2)を得る工程(6)を含む製造方法(以下、第4の製造方法ともいう)により、好適に製造できる。
但し、R211及びR212の少なくとも一方は一つ以上の水素を有することが必要である。
なお、本明細書において「高電圧」とは、4.2V以上の電圧をいう。また、「高電圧」の上限は4.9Vが好ましい。
なお、本明細書中で「エーテル結合」は、-O-で表される結合である。
炭素数が大きくなりすぎると低温特性が低下したり、電解質塩の溶解性が低下したりするおそれがあり、炭素数が少な過ぎると、電解質塩の溶解性の低下、放電効率の低下、更には粘性の増大等がみられることがある。
R1-R2- (a-1)
(式中、R1はフッ素原子を有していてもよい炭素数1以上のアルキル基;R2はフッ素原子を有していてもよい炭素数1~3のアルキレン基;ただし、R1及びR2の少なくとも一方はフッ素原子を有している)で示されるフッ素化アルキル基が、電解質塩の溶解性が良好な点から好ましく例示できる。
なお、R1及びR2は、更に、炭素原子、水素原子及びフッ素原子以外の、その他の原子を有していてもよい。
-CH2-、-CHF-、-CF2-、-CHCl-、-CFCl-、-CCl2-
-CH2-、-CHF-、-CF2-、-CHCl-、-CFCl-、-CCl2-
R3-(OR4)n1- (b-1)
(式中、R3はフッ素原子を有していてもよい、好ましくは炭素数1~6のアルキル基;R4はフッ素原子を有していてもよい、好ましくは炭素数1~4のアルキレン基;n1は1~3の整数;ただし、R3及びR4の少なくとも1つはフッ素原子を有している)で示されるものが挙げられる。
フッ素化アルキル基(a)、エーテル結合を有するフッ素化アルキル基(b)、及び、フッ素化アルコキシ基(c)のフッ素含有率は、各基の構造式に基づいて、{(フッ素原子の個数×19)/各基の式量}×100(%)により算出した値である。
なお、上記フッ素化飽和環状カーボネートのフッ素含有率は、フッ素化飽和環状カーボネートの構造式に基づいて、{(フッ素原子の個数×19)/フッ素化飽和環状カーボネートの分子量}×100(%)により算出した値である。
Rf2OCOOR7 (B)
(式中、Rf2は、炭素数1~7のフッ素化アルキル基であり、R7は、炭素数1~7のフッ素原子を含んでいてもよいアルキル基である。)で示される化合物を挙げることができる。
上記フッ素化アルキル基は、アルキル基が有する水素原子の少なくとも1つをフッ素原子で置換したものである。R7がフッ素原子を含むアルキル基である場合、フッ素化アルキル基となる。
Rf2及びR7は、低粘性である点で、炭素数が1~7であることが好ましく、1~2であることがより好ましい。
炭素数が大きくなりすぎると低温特性が低下したり、電解質塩の溶解性が低下したりするおそれがあり、炭素数が少な過ぎると、電解質塩の溶解性の低下、放電効率の低下、更には粘性の増大等がみられることがある。
R1-R2- (d-1)
(式中、R1はフッ素原子を有していてもよい炭素数1以上のアルキル基;R2はフッ素原子を有していてもよい炭素数1~3のアルキレン基;ただし、R1及びR2の少なくとも一方はフッ素原子を有している)で示されるフッ素化アルキル基が、電解質塩の溶解性が良好な点から好ましく例示できる。
なお、R1及びR2は、更に、炭素原子、水素原子及びフッ素原子以外の、その他の原子を有していてもよい。
-CH2-、-CHF-、-CF2-、-CHCl-、-CFCl-、-CCl2-
なお、本開示においてフッ素含有率は、上記フッ素化鎖状カーボネートの構造式に基づいて、
{(フッ素原子の個数×19)/フッ素化鎖状カーボネートの分子量}×100(%)
により算出した値である。
R31COOR32
(式中、R31及びR32は、互いに独立に、炭素数1~4のフッ素原子を含んでいてもよいアルキル基であり、R31及びR32の少なくとも一方はフッ素原子を含む。)で示されるフッ素化鎖状カルボン酸エステルが、他溶媒との相溶性や耐酸化性が良好な点から好ましい。
なかでもCF3CH2C(=O)OCH3、HCF2C(=O)OCH3、HCF2C(=O)OC2H5、CF3C(=O)OCH2C2F5、CF3C(=O)OCH2CF2CF2H、CF3C(=O)OCH2CF3、CF3C(=O)OCH(CF3)2、ペンタフルオロ酪酸エチル、ペンタフルオロプロピオン酸メチル、ペンタフルオロプロピオン酸エチル、ヘプタフルオロイソ酪酸メチル、トリフルオロ酪酸イソプロピル、トリフルオロ酢酸エチル、トリフルオロ酢酸tert-ブチル、トリフルオロ酢酸n-ブチル、テトラフルオロ-2-(メトキシ)プロピオン酸メチル、酢酸2,2-ジフルオロエチル、酢酸2,2,3,3-テトラフルオロプロピル、CH3C(=O)OCH2CF3、酢酸1H,1H-ヘプタフルオロブチル、4,4,4-トリフルオロ酪酸メチル、4,4,4-トリフルオロ酪酸エチル、3,3,3-トリフルオロプロピオン酸エチル、3,3,3-トリフルオロプロピオン酸3,3,3-トリフルオロプロピル、3-(トリフルオロメチル)酪酸エチル、2,3,3,3-テトラフルオロプロピオン酸メチル、2,2-ジフルオロ酢酸ブチル、2,2,3,3-テトラフルオロプロピオン酸メチル、2-(トリフルオロメチル)-3,3,3-トリフルオロプロピオン酸メチル、ヘプタフルオロ酪酸メチルが、他溶媒との相溶性及びレート特性が良好な点から好ましく、CF3CH2C(=O)OCH3、HCF2C(=O)OCH3、HCF2C(=O)OC2H5、CH3C(=O)OCH2CF3がより好ましく、HCF2C(=O)OCH3、HCF2C(=O)OC2H5、CH3C(=O)OCH2CF3が特に好ましい。
上記の組成の溶媒を含有する電解液は、電気化学デバイスの高温保存特性やサイクル特性を一層向上させることができる。
上記溶媒の含有量は、電解液中70~99.999質量%であることが好ましく、80質量%以上がより好ましく、92質量%以下がより好ましい。
X201は、O、S、炭素数1~10のアルキレン基、炭素数1~10のハロゲン化アルキレン基、炭素数6~20のアリーレン基又は炭素数6~20のハロゲン化アリーレン基(アルキレン基、ハロゲン化アルキレン基、アリーレン基、及び、ハロゲン化アリーレン基はその構造中に置換基、ヘテロ原子を持っていてもよく、またn202が1でn203が2~4のときにはn203個のX201はそれぞれが結合していてもよい)。
L201は、ハロゲン原子、シアノ基、炭素数1~10のアルキル基、炭素数1~10のハロゲン化アルキル基、炭素数6~20のアリール基、炭素数6~20のハロゲン化アリール基(アルキレン基、ハロゲン化アルキレン基、アリーレン基、及び、ハロゲン化アリーレン基はその構造中に置換基、ヘテロ原子を持っていてもよく、またn201が2~8のときにはn201個のL201はそれぞれが結合して環を形成してもよい)又は-Z203Y203。
Y201、Y202及びZ203は、それぞれ独立でO、S、NY204、炭化水素基又はフッ素化炭化水素基。Y203及びY204は、それぞれ独立でH、F、炭素数1~10のアルキル基、炭素数1~10のハロゲン化アルキル基、炭素数6~20のアリール基又は炭素数6~20のハロゲン化アリール基(アルキル基、ハロゲン化アルキル基、アリール基及びハロゲン化アリール基はその構造中に置換基、ヘテロ原子を持っていてもよく、Y203又はY204が複数個存在する場合にはそれぞれが結合して環を形成してもよい)。
なお、本明細書において、フッ素化炭化水素基は、炭化水素基の水素原子の少なくとも1つがフッ素原子に置換された基である。
化合物(5)としては、リチウムビス(オキサラト)ボレートが特に好ましい。
上記リチウム塩として任意のものを用いることができ、具体的には以下のものが挙げられる。例えば、LiPF6、LiBF4、LiClO4、LiAlF4、LiSbF6、LiTaF6、LiWF7、LiAsF6,LiAlCl4,LiI、LiBr、LiCl、LiB10Cl10、Li2SiF6、Li2PFO3、LiPO2F2等の無機リチウム塩;
LiWOF5等のタングステン酸リチウム類;
HCO2Li、CH3CO2Li、CH2FCO2Li、CHF2CO2Li、CF3CO2Li、CF3CH2CO2Li、CF3CF2CO2Li、CF3CF2CF2CO2Li、CF3CF2CF2CF2CO2Li等のカルボン酸リチウム塩類;
FSO3Li、CH3SO3Li、CH2FSO3Li、CHF2SO3Li、CF3SO3Li、CF3CF2SO3Li、CF3CF2CF2SO3Li、CF3CF2CF2CF2SO3Li、リチウムメチルサルフェート、リチウムエチルサルフェート(C2H5OSO3Li)、リチウム2,2,2-トリフルオロエチルサルフェート等のS=O基を有するリチウム塩類;
LiN(FCO)2、LiN(FCO)(FSO2)、LiN(FSO2)2、LiN(FSO2)(CF3SO2)、LiN(CF3SO2)2、LiN(C2F5SO2)2、リチウムビスパーフルオロエタンスルホニルイミド、リチウム環状1,2-パーフルオロエタンジスルホニルイミド、リチウム環状1,3-パーフルオロプロパンジスルホニルイミド、リチウム環状1,2-エタンジスルホニルイミド、リチウム環状1,3-プロパンジスルホニルイミド、リチウム環状1,4-パーフルオロブタンジスルホニルイミド、LiN(CF3SO2)(FSO2)、LiN(CF3SO2)(C3F7SO2)、LiN(CF3SO2)(C4F9SO2)、LiN(POF2)2等のリチウムイミド塩類;
LiC(FSO2)3、LiC(CF3SO2)3、LiC(C2F5SO2)3等のリチウムメチド塩類;
その他、式:LiPFa(CnF2n+1)6-a(式中、aは0~5の整数であり、nは1~6の整数である)で表される塩(例えばLiPF3(C2F5)3、LiPF3(CF3)3、LiPF3(iso-C3F7)3、LiPF5(iso-C3F7)、LiPF4(CF3)2、LiPF4(C2F5)2)、LiPF4(CF3SO2)2、LiPF4(C2F5SO2)2、LiBF3CF3、LiBF3C2F5、LiBF3C3F7、LiBF2(CF3)2、LiBF2(C2F5)2、LiBF2(CF3SO2)2、LiBF2(C2F5SO2)2等の含フッ素有機リチウム塩類、LiSCN、LiB(CN)4、LiB(C6H5)4、Li2(C2O4)、LiP(C2O4)3、Li2B12FbH12-b(bは0~3の整数)等が挙げられる。
上記アンモニウム塩としては、以下(IIa)~(IIe)が挙げられる。
(IIa)テトラアルキル4級アンモニウム塩
一般式(IIa):
で示されるテトラアルキル4級アンモニウム塩が好ましく例示できる。また、このアンモニウム塩の水素原子の一部又は全部がフッ素原子及び/又は炭素数1~4の含フッ素アルキル基で置換されているものも、耐酸化性が向上する点から好ましい。
で示されるアルキルエーテル基含有トリアルキルアンモニウム塩等が挙げられる。アルキルエーテル基を導入することにより、粘性の低下を図ることができる。
一般式(IIb-1):
で示されるスピロ環ビピロリジニウム塩、又は、一般式(IIb-3):
で示されるスピロ環ビピロリジニウム塩が好ましく挙げられる。また、このスピロ環ビピロリジニウム塩の水素原子の一部又は全部がフッ素原子及び/又は炭素数1~4の含フッ素アルキル基で置換されているものも、耐酸化性が向上する点から好ましい。
一般式(IIc):
で示されるイミダゾリウム塩が好ましく例示できる。また、このイミダゾリウム塩の水素原子の一部又は全部がフッ素原子及び/又は炭素数1~4の含フッ素アルキル基で置換されているものも、耐酸化性が向上する点から好ましい。
一般式(IId):
で示されるN-アルキルピリジニウム塩が好ましく例示できる。また、このN-アルキルピリジニウム塩の水素原子の一部又は全部がフッ素原子及び/又は炭素数1~4の含フッ素アルキル基で置換されているものも、耐酸化性が向上する点から好ましい。
一般式(IIe):
で示されるN,N-ジアルキルピロリジニウム塩が好ましく例示できる。また、このN,N-ジアルキルピロリジニウム塩の水素原子の一部又は全部がフッ素原子及び/又は炭素数1~4の含フッ素アルキル基で置換されているものも、耐酸化性が向上する点から好ましい。
更に容量を向上させるために、マグネシウム塩を用いてもよい。マグネシウム塩としては、例えば、Mg(ClO4)2、Mg(OOC2H5)2等が好ましい。
上記濃度の上限は、低温特性の点で、2.0モル/リットル以下であることが好ましく、1.5モル/リットル以下であることがより好ましい。
上記アンモニウム塩が、4フッ化ホウ酸トリエチルメチルアンモニウム(TEMABF4)の場合、その濃度は、低温特性に優れる点で、0.7~1.5モル/リットルであることが好ましい。
また、4フッ化ホウ酸スピロビピロリジニウム(SBPBF4)の場合は、0.7~2.0モル/リットルであることが好ましい。
Y21及びZ21が複数存在する場合、複数存在するY21及びZ21は同じであっても異なっていてもよい。
Z21としては、H-、F-、CH3-、CH3CH2-、CH3CH2CH2-、CF3-、CF3CF2-、CH2FCH2-及びCF3CF2CF2-からなる群より選択される少なくとも1種が好ましい。
これにより、電気化学デバイスの高温保存特性を向上させることができる。上記ニトリル化合物を単独で用いてもよく、2種以上を任意の組み合わせ及び比率で併用してもよい。
ハロゲン原子としては、例えば、フッ素原子、塩素原子、臭素原子、ヨウ素原子が挙げられる。中でもフッ素原子が好ましい。
アルキル基としては、炭素数1~5のものが好ましい。アルキル基の具体例としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、tert-ブチル基等が挙げられる。
アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基としては、上述したアルキル基の少なくとも一部の水素原子を上述したハロゲン原子で置換した基が挙げられる。
Ra及びRbがアルキル基、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基である場合は、RaとRbとが互いに結合して環構造(例えば、シクロヘキサン環)を形成していてもよい。
Ra及びRbは、水素原子又はアルキル基であることが好ましい。
ジニトリルの具体例としては、マロノニトリル、スクシノニトリル、グルタロニトリル、アジポニトリル、ピメロニトリル、スベロニトリル、アゼラニトリル、セバコニトリル、ウンデカンジニトリル、ドデカンジニトリル、メチルマロノニトリル、エチルマロノニトリル、イソプロピルマロノニトリル、tert-ブチルマロノニトリル、メチルスクシノニトリル、2,2-ジメチルスクシノニトリル、2,3-ジメチルスクシノニトリル、2,3,3-トリメチルスクシノニトリル、2,2,3,3-テトラメチルスクシノニトリル、2,3-ジエチル-2,3-ジメチルスクシノニトリル、2,2-ジエチル-3,3-ジメチルスクシノニトリル、ビシクロヘキシル-1,1-ジカルボニトリル、ビシクロヘキシル-2,2-ジカルボニトリル、ビシクロヘキシル-3,3-ジカルボニトリル、2,5-ジメチル-2,5-ヘキサンジカルボニトリル、2,3-ジイソブチル-2,3-ジメチルスクシノニトリル、2,2-ジイソブチル-3,3-ジメチルスクシノニトリル、2-メチルグルタロニトリル、2,3-ジメチルグルタロニトリル、2,4-ジメチルグルタロニトリル、2,2,3,3-テトラメチルグルタロニトリル、2,2,4,4-テトラメチルグルタロニトリル、2,2,3,4-テトラメチルグルタロニトリル、2,3,3,4-テトラメチルグルタロニトリル、1,4-ジシアノペンタン、2,6-ジシアノヘプタン、2,7-ジシアノオクタン、2,8-ジシアノノナン、1,6-ジシアノデカン、1,2-ジジアノベンゼン、1,3-ジシアノベンゼン、1,4-ジシアノベンゼン、3,3’-(エチレンジオキシ)ジプロピオニトリル、3,3’-(エチレンジチオ)ジプロピオニトリル、3,9-ビス(2-シアノエチル)-2,4,8,10-テトラオキサスピロ[5,5]ウンデカン、ブタンニトリル、フタロニトリル等を例示できる。これらのうち、特に好ましいのはスクシノニトリル、グルタロニトリル、アジポニトリルである。
また、トリカルボニトリルの具体例としては、ペンタントリカルボニトリル、プロパントリカルボニトリル、1,3,5-ヘキサントリカルボニトリル、1,3,6-ヘキサントリカルボニトリル、ヘプタントリカルボニトリル、1,2,3-プロパントリカルボニトリル、1,3,5-ペンタントリカルボニトリル、シクロヘキサントリカルボニトリル、トリスシアノエチルアミン、トリスシアノエトキシプロパン、トリシアノエチレン、トリス(2-シアノエチル)アミン等が挙げられ特に好ましいものは、1,3,6-ヘキサントリカルボニトリル、シクロヘキサントリカルボニトリルであり、最も好ましいものはシクロヘキサントリカルボニトリルである。
ハロゲン原子、アルキル基、及び、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基については、上記一般式(1a)について例示したものが挙げられる。
上記NC-Rc1-Xc1-におけるRc1はアルキレン基である。アルキレン基としては、炭素数1~3のアルキレン基が好ましい。
Rc、Rd及びReは、それぞれ独立して、水素原子、ハロゲン原子、アルキル基、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基であることが好ましい。
Rc、Rd及びReの少なくとも1つは、ハロゲン原子、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基であることが好ましく、フッ素原子、又は、アルキル基の少なくとも一部の水素原子をフッ素原子で置換した基であることがより好ましい。
Rd及びReがアルキル基、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基である場合は、RdとReとが互いに結合して環構造(例えば、シクロヘキサン環)を形成していてもよい。
ハロゲン原子、アルキル基、及び、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基については、上記一般式(1a)について例示したものが挙げられる。
シアノ基を含む基としては、シアノ基のほか、アルキル基の少なくとも一部の水素原子をシアノ基で置換した基が挙げられる。この場合のアルキル基としては、上記一般式(1a)について例示したものが挙げられる。
Rf、Rg、Rh及びRiのうち少なくとも1つはシアノ基を含む基である。好ましくは、Rf、Rg、Rh及びRiのうち少なくとも2つがシアノ基を含む基であることであり、より好ましくは、Rh及びRiがシアノ基を含む基であることである。Rh及びRiがシアノ基を含む基である場合、Rf及びRgは、水素原子であることが好ましい。
このような化合物を含有することにより、電極界面の安定性が向上し、電気化学デバイスの特性を向上させることができる。
上記ポリエチレンオキシドとしては、例えば、ポリエチレンオキシドモノオール、ポリエチレンオキシドカルボン酸、ポリエチレンオキシドジオール、ポリエチレンオキシドジカルボン酸、ポリエチレンオキシドトリオール、ポリエチレンオキシドトリカルボン酸等が挙げられる。これらは単独で使用してもよいし、2種以上を併用してもよい。
なかでも、電気化学デバイスの特性がより良好となる点で、ポリエチレンオキシドモノオールとポリエチレンオキシドジオールの混合物、及び、ポリエチレンカルボン酸とポリエチレンジカルボン酸の混合物であることが好ましい。
上記重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)法によるポリスチレン換算により測定することができる。
上記ポリエチレンオキシドの含有量は、5×10-6mol/kg以上であることがより好ましい。
フッ素化不飽和環状カーボネートは、不飽和結合とフッ素原子とを有する環状カーボネートである。フッ素化不飽和環状カーボネートが有するフッ素原子の数は1以上があれば、特に制限されない。中でもフッ素原子が通常6以下、好ましくは4以下であり、1個又は2個のものが最も好ましい。
三重結合を有する化合物の具体例としては、例えば、以下の化合物が挙げられる。
1-ペンチン、2-ペンチン、1-ヘキシン、2-ヘキシン、3-ヘキシン、1-ヘプチン、2-ヘプチン、3-ヘプチン、1-オクチン、2-オクチン、3-オクチン、4-オクチン、1-ノニン、2-ノニン、3-ノニン、4-ノニン、1-ドデシン、2-ドデシン、3-ドデシン、4-ドデシン、5-ドデシン、フェニルアセチレン、1-フェニル-1-プロピン、1-フェニル-2-プロピン、1-フェニル-1-ブチン、4-フェニル-1-ブチン、4-フェニル-1-ブチン、1-フェニル-1-ペンチン、5-フェニル-1-ペンチン、1-フェニル-1-ヘキシン、6-フェニル-1-ヘキシン、ジフェニルアセチレン、4-エチニルトルエン、ジシクロヘキシルアセチレン等の炭化水素化合物;
フルオロベンゼン、ジフルオロベンゼン、ヘキサフルオロベンゼン、ベンゾトリフルオライド、モノフルオロベンゼン、1-フルオロ-2-シクロヘキシルベンゼン、1-フルオロ-4-tert-ブチルベンゼン、1-フルオロ-3-シクロヘキシルベンゼン、1-フルオロ-2-シクロヘキシルベンゼン、フッ素化ビフェニル等の含フッ素芳香族化合物;
エリスリタンカーボネート、スピロ-ビス-ジメチレンカーボネート、メトキシエチル-メチルカーボネート等のカーボネート化合物;
ジオキソラン、ジオキサン、2,5,8,11-テトラオキサドデカン、2,5,8,11,14-ペンタオキサペンタデカン、エトキシメトキシエタン、トリメトキシメタン、グライム、エチルモノグライム等のエーテル系化合物;
ジメチルケトン、ジエチルケトン、3-ペンタノン等のケトン系化合物;
2-アリル無水コハク酸等の酸無水物;
シュウ酸ジメチル、シュウ酸ジエチル、シュウ酸エチルメチル、シュウ酸ジ(2-プロピニル)、シュウ酸メチル2-プロピニル、コハク酸ジメチル、グルタル酸ジ(2-プロピニル)、ギ酸メチル、ギ酸エチル、ギ酸2-プロピニル、2-ブチン-1,4-ジイルジホルメート、メタクリル酸2-プロピニル、マロン酸ジメチル等のエステル化合物;
アセトアミド、N-メチルホルムアミド、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド等のアミド系化合物;
硫酸エチレン、硫酸ビニレン、亜硫酸エチレン、フルオロスルホン酸メチル、フルオロスルホン酸エチル、メタンスルホン酸メチル、メタンスルホン酸エチル、ブスルファン、スルホレン、ジフェニルスルホン、N,N-ジメチルメタンスルホンアミド、N,N-ジエチルメタンスルホンアミド、ビニルスルホン酸メチル、ビニルスルホン酸エチル、ビニルスルホン酸アリル、ビニルスルホン酸プロパルギル、アリルスルホン酸メチル、アリルスルホン酸エチル、アリルスルホン酸アリル、アリルスルホン酸プロパルギル、1,2-ビス(ビニルスルホニロキシ)エタン、無水プロパンジスルホン酸、無水スルホ酪酸、無水スルホ安息香酸、無水スルホプロピオン酸、無水エタンジスルホン酸、メチレンメタンジスルホネート、メタンスルホン酸2-プロピニル、ペンテンサルファイト、ペンタフルオロフェニルメタンスルホネート、プロピレンサルフェート、プロピレンサルファイト、プロパンサルトン、ブチレンサルファイト、ブタン-2,3-ジイルジメタンスルホネート、2-ブチン-1,4-ジイルジメタンスルホネート、ビニルスルホン酸2-プロピニル、ビス(2-ビニルスルホニルエチル)エーテル、5-ビニル-ヘキサヒドロ-1,3,2-ベンゾジオキサチオール-2-オキシド、2-(メタンスルホニルオキシ)プロピオン酸2-プロピニル、5,5-ジメチル-1,2-オキサチオラン-4-オン2,2-ジオキシド、3-スルホ-プロピオン酸無水物トリメチレンメタンジスルホネート2-メチルテトラヒドロフラン、トリメチレンメタンジスルホネート、テトラメチレンスルホキシド、ジメチレンメタンジスルホネート、ジフルオロエチルメチルスルホン、ジビニルスルホン、1,2-ビス(ビニルスルホニル)エタン、エチレンビススルホン酸メチル、エチレンビススルホン酸エチル、エチレンサルフェート、チオフェン1-オキシド等の含硫黄化合物;
1-メチル-2-ピロリジノン、1-メチル-2-ピペリドン、3-メチル-2-オキサゾリジノン、1,3-ジメチル-2-イミダゾリジノン及びN-メチルスクシンイミド、ニトロメタン、ニトロエタン、エチレンジアミン等の含窒素化合物;
亜リン酸トリメチル、亜リン酸トリエチル、亜リン酸トリフェニル、リン酸トリメチル、リン酸トリエチル、リン酸トリフェニル、メチルホスホン酸ジメチル、エチルホスホン酸ジエチル、ビニルホスホン酸ジメチル、ビニルホスホン酸ジエチル、ジエチルホスホノ酢酸エチル、ジメチルホスフィン酸メチル、ジエチルホスフィン酸エチル、トリメチルホスフィンオキシド、トリエチルホスフィンオキシド、リン酸ビス(2,2-ジフルオロエチル)2,2,2-トリフルオロエチル、リン酸ビス(2,2,3,3-テトラフルオロプロピル)2,2,2-トリフルオロエチル、リン酸ビス(2,2,2-トリフルオロエチル)メチル、リン酸ビス(2,2,2-トリフルオロエチル)エチル、リン酸ビス(2,2,2-トリフルオロエチル)2,2-ジフルオロエチルリン酸ビス(2,2,2-トリフルオロエチル)2,2,3,3-テトラフルオロプロピル、リン酸トリブチル、リン酸トリス(2,2,2-トリフルオロエチル)、リン酸トリス(1,1,1,3,3,3-ヘキサフルオロプロパン-2-イル)、リン酸トリオクチル、リン酸2-フェニルフェニルジメチル、リン酸2-フェニルフェニルジエチル、リン酸(2,2,2-トリフルオロエチル)(2,2,3,3-テトラフルオロプロピル)メチル、メチル2-(ジメトキシホスホリル)アセテート、メチル2-(ジメチルホスホリル)アセテート、メチル2-(ジエトキシホスホリル)アセテート、メチル2-(ジエチルホスホリル)アセテート、メチレンビスホスホン酸メチル、メチレンビスホスホン酸エチル、エチレンビスホスホン酸メチル、エチレンビスホスホン酸エチル、ブチレンビスホスホン酸メチル、ブチレンビスホスホン酸エチル、酢酸2-プロピニル2-(ジメトキシホスホリル)、酢酸2-プロピニル2-(ジメチルホスホリル)、酢酸2-プロピニル2-(ジエトキシホスホリル)、酢酸2-プロピニル2-(ジエチルホスホリル)、リン酸トリス(トリメチルシリル)、リン酸トリス(トリエチルシリル)、リン酸トリス(トリメトキシシリル)、亜リン酸トリス(トリメチルシリル)、亜リン酸トリス(トリエチルシリル)、亜リン酸トリス(トリメトキシシリル)、ポリリン酸トリメチルシリル等の含燐化合物;
ホウ酸トリス(トリメチルシリル)、ホウ酸トリス(トリメトキシシリル)等の含ホウ素化合物;
ジメトキシアルミノキシトリメトキシシラン、ジエトキシアルミノキシトリエトキシシラン、ジプロポキシアルミノキシトリエトキシシラン、ジブトキシアルミノキシトリメトキシシラン、ジブトキシアルミノキシトリエトキシシラン、チタンテトラキス(トリメチルシロキシド)、チタンテトラキス(トリエチルシロキシド)、テトラメチルシラン等のシラン化合物;
等が挙げられる。これらは1種を単独で用いても、2種以上を併用してもよい。これらの助剤を添加することにより、高温保存後の容量維持特性やサイクル特性を向上させることができる。
上記その他の助剤としては、なかでも、含燐化合物が好ましく、リン酸トリス(トリメチルシリル)、亜リン酸(トリストリメチルシリル)が好ましい。
で示される含フッ素ラクトンが挙げられる。
で示される含フッ素ラクトン等も挙げられる。
で示される5員環構造が、合成が容易である点、化学的安定性が良好な点から好ましく挙げられ、更には、AとBの組合せにより、下記式(F):
で示される含フッ素ラクトンと、下記式(G):
で示される含フッ素ラクトンがある。
炭素数2~10の鎖状エーテルとしては、ジメチルエーテル、ジエチルエーテル、ジ-n-ブチルエーテル、ジメトキシメタン、メトキシエトキシメタン、ジエトキシメタン、ジメトキシエタン、メトキシエトキシエタン、ジエトキシエタン、エチレングリコールジ-n-プロピルエーテル、エチレングリコールジ-n-ブチルエーテル、ジエチレングリコール、ジエチレングリコールジメチルエーテル、ペンタエチレングリコール、トリエチレングリコールジメチルエーテル、トリエチレングリコール、テトラエチレングリコール、テトラエチレングリコールジメチルエーテル、ジイソプロピルエーテル等が挙げられる。
上記フッ素化エーテルとしては、下記一般式(I):
Rf3-O-Rf4 (I)
(式中、Rf3及びRf4は同じか又は異なり、炭素数1~10のアルキル基又は炭素数1~10のフッ素化アルキル基である。ただし、Rf3及びRf4の少なくとも一方は、フッ素化アルキル基である。)
で表されるフッ素化エーテル(I)が挙げられる。フッ素化エーテル(I)を含有させることにより、電解液の難燃性が向上するとともに、高温高電圧での安定性、安全性が向上する。
なかでも、Rf3及びRf4が、同じか又は異なり、Rf3が炭素数3~6のフッ素化アルキル基であり、かつ、Rf4が炭素数2~6のフッ素化アルキル基であることがより好ましい。
上記フッ素含有率の下限は、45質量%がより好ましく、50質量%が更に好ましく、55質量%が特に好ましい。上限は70質量%がより好ましく、66質量%が更に好ましい。
なお、フッ素化エーテル(I)のフッ素含有率は、フッ素化エーテル(I)の構造式に基づいて、{(フッ素原子の個数×19)/フッ素化エーテル(I)の分子量}×100(%)により算出した値である。
なかでも、高沸点、他の溶媒との相溶性や電解質塩の溶解性が良好な点で有利なことから、HCF2CF2CH2OCF2CFHCF3(沸点106℃)、CF3CF2CH2OCF2CFHCF3(沸点82℃)、HCF2CF2CH2OCF2CF2H(沸点92℃)及びCF3CF2CH2OCF2CF2H(沸点68℃)からなる群より選択される少なくとも1種であることが好ましく、HCF2CF2CH2OCF2CFHCF3(沸点106℃)及びHCF2CF2CH2OCF2CF2H(沸点92℃)からなる群より選択される少なくとも1種であることがより好ましい。
Rf5COO-M+ (30)
(式中、Rf5は炭素数3~10のエーテル結合を含んでいてもよい含フッ素アルキル基;M+はLi+、Na+、K+又はNHR’3 +(R’は同じか又は異なり、いずれもH又は炭素数が1~3のアルキル基)である)
で表される含フッ素カルボン酸塩や、下記式(40):
Rf6SO3 -M+ (40)
(式中、Rf6は炭素数3~10のエーテル結合を含んでいてもよい含フッ素アルキル基;M+はLi+、Na+、K+又はNHR’3 +(R’は同じか又は異なり、いずれもH又は炭素数が1~3のアルキル基)である)
で表される含フッ素スルホン酸塩等が好ましい。
A-(D)-B (101)
[式中、Dは式(201):
-(D1)n-(FAE)m-(AE)p-(Y)q- (201)
(式中、D1は、式(2a):
で示される側鎖に含フッ素エーテル基を有するエーテル単位;
FAEは、式(2b):
で示される側鎖にフッ素化アルキル基を有するエーテル単位;
AEは、式(2c):
で示されるエーテル単位;
Yは、式(2d-1)~(2d-3):
nは0~200の整数;mは0~200の整数;pは0~10000の整数;qは1~100の整数;ただしn+mは0ではなく、D1、FAE、AE及びYの結合順序は特定されない);
A及びBは同じか又は異なり、水素原子、フッ素原子及び/又は架橋性官能基を含んでいてもよいアルキル基、フッ素原子及び/又は架橋性官能基を含んでいてもよいフェニル基、-COOH基、-OR(Rは水素原子又はフッ素原子及び/又は架橋性官能基を含んでいてもよいアルキル基)、エステル基又はカーボネート基(ただし、Dの末端が酸素原子の場合は-COOH基、-OR、エステル基及びカーボネート基ではない)]
で表される側鎖に含フッ素基を有する非晶性含フッ素ポリエーテル化合物である。
なお、添加剤として化合物(7)を使用する場合、上述した電解質塩としては、化合物(7)以外の化合物を使用することが好ましい。
上記S=O基を有するリチウム塩類としては、モノフルオロスルホン酸リチウム(FSO3Li)、メチル硫酸リチウム(CH3OSO3Li)、エチル硫酸リチウム(C2H5OSO3Li)、2,2,2-トリフルオロエチル硫酸リチウム等が挙げられる。
化合物(7)としては、中でも、LiPO2F2、FSO3Li、C2H5OSO3Liが好ましい。
HFの含有量は、10ppm以上がより好ましく、20ppm以上が更に好ましい。HFの含有量はまた、100ppm以下がより好ましく、80ppm以下が更に好ましく、50ppm以下が特に好ましい。
HFの含有量は、中和滴定法により測定することができる。
上記非水系電解液電池は、公知の構造を採ることができ、典型的には、イオン(例えばリチウムイオン)を吸蔵・放出可能な正極及び正極と、上記本開示の電解液とを備える。このような本開示の電解液を備える電気化学デバイスもまた、本開示の一つである。
上記電気化学デバイスを備えるモジュールも本開示の一つである。
上記リチウムイオン二次電池は、正極、負極、及び、上述の電解液を備えることが好ましい。
正極は、正極活物質を含む正極活物質層と、集電体とから構成される。
式:LiaMn2-bM1 bO4(式中、0.9≦a;0≦b≦1.5;M1はFe、Co、Ni、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeよりなる群から選ばれる少なくとも1種の金属)で表されるリチウム・マンガンスピネル複合酸化物、
式:LiNi1-cM2 cO2(式中、0≦c≦0.5;M2はFe、Co、Mn、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeよりなる群から選ばれる少なくとも1種の金属)で表されるリチウム・ニッケル複合酸化物、又は、
式:LiCo1-dM3 dO2(式中、0≦d≦0.5;M3はFe、Ni、Mn、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeよりなる群から選ばれる少なくとも1種の金属)で表されるリチウム・コバルト複合酸化物が挙げられる。
なお、本開示では、タップ密度は、正極活物質粉体5~10gを10mlのガラス製メスシリンダーに入れ、ストローク約20mmで200回タップした時の粉体充填密度(タップ密度)g/cm3として求める。
上記正極活物質の粒子は、二次粒子の平均粒子径が40μm以下で、かつ、平均一次粒子径が1μm以下の微粒子を、0.5~7.0体積%含むものであることが好ましい。平均一次粒子径が1μm以下の微粒子を含有させることにより、電解液との接触面積が大きくなり、電極と電解液との間でのリチウムイオンの拡散をより速くすることができ、その結果、電池の出力性能を向上させることができる。
上記結着剤としては、電極製造時に使用する溶媒や電解液に対して安全な材料であれば、任意のものを使用することができ、例えば、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリメチルメタクリレート、芳香族ポリアミド、キトサン、アルギン酸、ポリアクリル酸、ポリイミド、セルロース、ニトロセルロース等の樹脂系高分子;SBR(スチレン・ブタジエンゴム)、イソプレンゴム、ブタジエンゴム、フッ素ゴム、NBR(アクリロニトリル・ブタジエンゴム)、エチレン・プロピレンゴム等のゴム状高分子;スチレン・ブタジエン・スチレンブロック共重合体又はその水素添加物;EPDM(エチレン・プロピレン・ジエン三元共重合体)、スチレン・エチレン・ブタジエン・スチレン共重合体、スチレン・イソプレン・スチレンブロック共重合体又はその水素添加物等の熱可塑性エラストマー状高分子;シンジオタクチック-1,2-ポリブタジエン、ポリ酢酸ビニル、エチレン・酢酸ビニル共重合体、プロピレン・α-オレフィン共重合体等の軟質樹脂状高分子;ポリフッ化ビニリデン、ポリテトラフルオロエチレン、フッ化ビニリデン共重合体、テトラフルオロエチレン・エチレン共重合体等のフッ素系高分子;アルカリ金属イオン(特にリチウムイオン)のイオン伝導性を有する高分子組成物等が挙げられる。これらは、1種を単独で用いても、2種以上を任意の組み合わせ及び比率で併用してもよい。
負極は、負極活物質を含む負極活物質層と、集電体とから構成される。
また、Si又はSnを第一の構成元素とし、それに加えて第2、第3の構成元素を含む複合材料が挙げられる。第2の構成元素は、例えば、コバルト、鉄、マグネシウム、チタン、バナジウム、クロム、マンガン、ニッケル、銅、亜鉛、ガリウム及びジルコニウムのうち少なくとも1種である。第3の構成元素は、例えば、ホウ素、炭素、アルミニウム及びリンのうち少なくとも1種である。
特に、高い電池容量及び優れた電池特性が得られることから、上記金属材料として、ケイ素又はスズの単体(微量の不純物を含んでよい)、SiOv(0<v≦2)、SnOw(0≦w≦2)、Si-Co-C複合材料、Si-Ni-C複合材料、Sn-Co-C複合材料、Sn-Ni-C複合材料が好ましい。
LixTiyMzO4
[式中、Mは、Na、K、Co、Al、Fe、Ti、Mg、Cr、Ga、Cu、Zn及びNbからなる群より選ばれる少なくとも1種の元素を表わす。]
で表される化合物であることが好ましい。
上記組成の中でも、
(i)1.2≦x≦1.4、1.5≦y≦1.7、z=0
(ii)0.9≦x≦1.1、1.9≦y≦2.1、z=0
(iii)0.7≦x≦0.9、2.1≦y≦2.3、z=0
の構造が、電池性能のバランスが良好なため特に好ましい。
水系溶媒としては、水、アルコール等が挙げられ、有機系溶媒としてはN-メチルピロリドン(NMP)、ジメチルホルムアミド、ジメチルアセトアミド、メチルエチルケトン、シクロヘキサノン、酢酸メチル、アクリル酸メチル、ジエチルトリアミン、N,N-ジメチルアミノプロピルアミン、テトラヒドロフラン(THF)、トルエン、アセトン、ジエチルエーテル、ジメチルアセトアミド、ヘキサメチルホスファルアミド、ジメチルスルホキシド、ベンゼン、キシレン、キノリン、ピリジン、メチルナフタレン、ヘキサン等が挙げられる。
本開示のリチウムイオン二次電池は、更に、セパレータを備えることが好ましい。
上記セパレータの材質や形状は、電解液に安定であり、かつ、保液性に優れていれば特に限定されず、公知のものを使用することができる。なかでも、本開示の電解液に対し安定な材料で形成された、樹脂、ガラス繊維、無機物等が用いられ、保液性に優れた多孔性シート又は不織布状の形態の物等を用いるのが好ましい。
電極群は、上記の正極板と負極板とを上記のセパレータを介してなる積層構造のもの、及び上記の正極板と負極板とを上記のセパレータを介して渦巻き状に捲回した構造のもののいずれでもよい。電極群の体積が電池内容積に占める割合(以下、電極群占有率と称する)は、通常40%以上であり、50%以上が好ましく、また、通常90%以下であり、80%以下が好ましい。
上記電気二重層キャパシタでは、正極及び負極の少なくとも一方は分極性電極であり、分極性電極及び非分極性電極としては特開平9-7896号公報に詳しく記載されている以下の電極が使用できる。
<ジアリルスルファミン酸リチウム(化合物A)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ジアリルアミン(8.3g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ジアリルスルファミン酸リチウム(8.7g)を得た。得られた粗ジアリルスルファミン酸リチウム(8.7g)をメタノール14mLに60℃で溶解させ、そこへジメチルカーボネート14mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート14mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のジアリルスルファミン酸リチウム(3.5g,19mmol、トータル収率27%)を得た。
<ジプロパルギルスルファミン酸リチウム(化合物B)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ジプロパルギルアミン(7.9g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ジプロパルギルスルファミン酸リチウム(7.1g)を得た。得られた粗ジプロパルギルスルファミン酸リチウム(7.1g)をメタノール14mLに60℃で溶解させ、そこへジメチルカーボネート14mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート14mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のジプロパルギルスルファミン酸リチウム(3.2g,18mmol、トータル収率25%)を得た。
<ペンタン-1,5-ジイルスルファミン酸リチウム(化合物C)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ピペリジン(7.2g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ペンタン-1,5-ジイルスルファミン酸リチウム(10.3g)を得た。得られた粗ペンタン-1,5-ジイルスルファミン酸リチウム(10.3g)をメタノール16mLに60℃で溶解させ、そこへジメチルカーボネート16mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート16mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のペンタン-1,5-ジイルスルファミン酸リチウム(4.7g,27mmol、トータル収率39%)を得た。
<ブタン-1,4-ジイルスルファミン酸リチウム(化合物D)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ピロリジン(6.0g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ブタン-1,4-ジイルスルファミン酸リチウム(9.7g)を得た。得られた粗ブタン-1,4-ジイルスルファミン酸リチウム(9.7g)をメタノール100mLに60℃で溶解させ、そこへジメチルカーボネート100mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート100mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のブタン-1,4-ジイルスルファミン酸リチウム(3.7g,24mmol、トータル収率33%)を得た。
<メチル2,2,2-トリフルオロエチルスルファミン酸リチウム(化合物E)の合成>
反応容器に塩化リチウム(1.0g,24mmol)、ジメチルカーボネート(35mL)を加え、そこにクロロスルホン酸(3.0g,26mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、メチル2,2,2-トリフルオロエチルアミン(6.4g,57mmol)を氷水浴下で滴下した(反応液温度上昇0~5℃、滴下時間約5分)。この溶液を室温で1時間撹拌した後、トリエチルアミン(6.0g)、ジクロロメタン(50mL)を加えてさらに1日撹拌した。得られた反応混合物をろ過、ジクロロメタン洗浄して目的のメチル2,2,2-トリフルオロエチルスルファミン酸リチウム(2.3g,12mmol、トータル収率49%)を得た。
<ビス(2,2,2-トリフルオロエチル)スルファミン酸リチウム(化合物F)の合成>
反応容器に塩化リチウム(1.0g,24mmol)、ジメチルカーボネート(35mL)を加え、そこにクロロスルホン酸(3.0g,26mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(2,2,2-トリフルオロエチル)アミン(10.3g,57mmol)を氷水浴下で滴下した(反応液温度上昇0~5℃、滴下時間約5分)。この溶液を室温で1時間撹拌した後、トリエチルアミン(6.0g)、ジクロロメタン(50mL)を加えてさらに1日撹拌した。得られた反応混合物をろ過、ジクロロメタン洗浄して目的のビス(2,2,2-トリフルオロエチル)スルファミン酸リチウム(3.4g,13mmol、トータル収率54%)を得た。
<ビス(2,2,3,3,3-ペンタフルオロプロピル)スルファミン酸リチウム(化合物G)の合成>
反応容器に塩化リチウム(1.0g,24mmol)、ジメチルカーボネート(35mL)を加え、そこにクロロスルホン酸(3.0g,26mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(2,2,3,3,3-ペンタフルオロプロピル)アミン(13.3g,57mmol)を氷水浴下で滴下した(反応液温度上昇0~5℃、滴下時間約5分)。この溶液を室温で1時間撹拌した後、トリエチルアミン(6.0g)、ジクロロメタン(50mL)を加えて更に1日撹拌した。得られた反応混合物をろ過、ジクロロメタン洗浄して目的のビス(2,2,3,3,3-ペンタフルオロプロピル)スルファミン酸リチウム(6.3g,17.2mmol、収率72%)を得た。
<ビス(2-フルオロアリル)スルファミン酸リチウム(化合物H)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(2-フルオロアリル)アミン(11.3g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ビス(2-フルオロアリル)スルファミン酸リチウム(9.0g)を得た。得られた粗ビス(2-フルオロアリル)スルファミン酸リチウム(9.0g)をメタノール16mLに60℃で溶解させ、そこへジメチルカーボネート16mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート16mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のビス(2-フルオロアリル)スルファミン酸リチウム(4.2g,19mmol、トータル収率27%)を得た。
<3-オキサペンタン-1,5-ジイルスルファミン酸リチウム(化合物I)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、モルホリン(7.4g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗3-オキサペンタン-1,5-ジイルスルファミン酸リチウム(12.5g)を得た。得られた粗3-オキサペンタン-1,5-ジイルスルファミン酸リチウム(12.5g)をメタノール140mLに60℃で溶解させ、そこへジメチルカーボネート100mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート100mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的の3-オキサペンタン-1,5-ジイルスルファミン酸リチウム(3.1g,18mmol、トータル収率25%)を得た。
<ビス(2-メトキシエチル)スルファミン酸リチウム(化合物J)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(2-メトキシエチル)アミン(11.3g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ビス(2-メトキシエチル))スルファミン酸リチウム(8.3g)を得た。得られた粗ビス(2-メトキシエチル)スルファミン酸リチウム(8.3g)をメタノール16mLに60℃で溶解させ、そこへジメチルカーボネート16mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート16mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のビス(2-メトキシエチル)スルファミン酸リチウム(4.0g,18mmol、トータル収率26%)を得た。
<ビス(シアノメチル)スルファミン酸リチウム(化合物K)の合成>
反応容器に塩化リチウム(1.0g,24mmol)、ジメチルカーボネート(35mL)を加え、そこにクロロスルホン酸(3.0g,26mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(シアノメチル)アミン(5.4g,57mmol)をアセトニトリル(30mL)に溶解させた混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、トリエチルアミン(6.0g)、ジクロロメタン(50mL)を加えてさらに1日撹拌した。得られた反応混合物をろ過、ジクロロメタン洗浄して目的のビス(シアノメチル)スルファミン酸リチウム(3.9g,22mmol、トータル収率91%)を得た。
<ビス(ペンタフルオロエチル)スルファミン酸リチウム(化合物L)の合成>
反応容器にジエチルスルファミン酸リチウム(15.9g,100mmol)、水(20mL)を加え、0℃でフッ素ガスをバブリングした。1.5時間後、水酸化リチウム水溶液で液性を中性に調整し、溶媒留去したところにアセトニトリルを加えてろ過した。ろ液を24時間真空乾燥して目的のビス(ペンタフルオロエチル)スルファミン酸リチウム(32.2g,95mmol、収率95%)を得た。
<ビス(トリフルオロメタンスルホニル)スルファミン酸リチウム(化合物M)の合成>
反応容器にリチウムビス(トリフルオロメタンスルホニル)イミド(3.9g,14mmol)、ジエチルエーテル(30mL)を加え、そこにクロロスルホン酸(1.6g,14mmol)を滴下した(発熱無し)。この溶液を室温で1日撹拌した後、溶媒留去して目的のビス(トリフルオロメタンスルホニル)スルファミン酸リチウム(4.5g)を得た。
<ビス(2-トリフルオロメトキシエチル)スルファミン酸リチウム(化合物N)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(2-トリフルオロメトキシエチル)アミン(20.5g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ビス(2-トリフルオロメトキシエチル))スルファミン酸リチウム(6.5g)を得た。得られた粗ビス(2-トリフルオロメトキシエチル)スルファミン酸リチウム(6.5g)をメタノール16mLに60℃で溶解させ、そこへジメチルカーボネート16mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート16mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のビス(2-トリフルオロメトキシエチル)スルファミン酸リチウム(2.5g,8mmol、トータル収率11%)を得た。
<ビス(3-ピリジルメチル)スルファミン酸リチウム(化合物O)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(3-ピリジルメチル)アミン(16.9g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ビス(2-トリフルオロメトキシエチル)スルファミン酸リチウム(10.2g)を得た。得られた粗ビス(3-ピリジルメチル)スルファミン酸リチウム(10.2g)をメタノール20mLに60℃で溶解させ、そこへジメチルカーボネート20mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート20mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のビス(3-ピリジルメチル)スルファミン酸リチウム(6.4g,22mmol、トータル収率32%)を得た。
<ビス(3-トリメチルシリルプロピン-2-イル)スルファミン酸リチウム(化合物P)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ビス(3-トリメチルシリルプロピン-2-イル)アミン(20.2g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ビス(3-トリメチルシリルプロピン-2-イル)スルファミン酸リチウム(12.0g)を得た。得られた粗ビス(3-トリメチルシリルプロピン-2-イル)スルファミン酸リチウム(12.0g)をメタノール22mLに60℃で溶解させ、そこへジメチルカーボネート22mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート22mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のビス(3-トリメチルシリルプロピン-2-イル)スルファミン酸リチウム(6.9g,21mmol、トータル収率30%)を得た。
<ビス(フルオロスルホニル)スルファミン酸リチウム(化合物Q)の合成>
反応容器にリチウムビス(フルオロスルホニル)イミド(3.5g,19mmol)、ジエチルエーテル(30mL)を加え、そこにクロロスルホン酸(2.2g,19mmol)を滴下した(発熱無し)。この溶液を室温で1日撹拌した後、溶媒留去して目的のビス(フルオロスルホニル)スルファミン酸リチウム(1.5g,5.7mmol、収率30%)を得た。
<ジフルオロスルファミン酸リチウム(化合物R)の合成>
反応容器にスルファミン酸(16.4g,170mmol)、水(30mL)、水酸化リチウム(4.8g,200mmol)を加え、0℃でフッ素ガスをバブリングした。1.5時間後、水酸化リチウム水溶液で液性を中性に調整し、溶媒留去したところにアセトニトリルを加えてろ過した。ろ液を24時間真空乾燥して目的のジフルオロスルファミン酸リチウム(22.5g,162mmol、収率95%)を得た。
<ジメチルスルファミン酸リチウム(化合物X)の合成>
反応容器に氷水40mLを加え、そこにジメチルスルファモイルクロリド(4.0g,28mmol)を滴下した。そのまま30分撹拌した後、溶媒留去してジメチルスルファミン酸を含む混合物を得た。そこへ1.0Mの水酸化リチウム水溶液28mLを加えて1時間撹拌し、溶媒留去して目的のジメチルスルファミン酸リチウム(3.4g,25.8mmol、トータル収率92%)を得た。
<ジエチルスルファミン酸リチウム(化合物Y)の合成>
反応容器に塩化リチウム(3.0g,71mmol)、ジメチルカーボネート(60mL)を加え、そこにクロロスルホン酸(9.1g,78mmol)を滴下した。この溶液を80℃で1時間撹拌した後冷却して室温に戻し、ジエチルアミン(6.2g,85mmol)とトリエチルアミン(8.6g,85mmol)の混合溶液を氷水浴下で滴下した(反応液温度上昇5~10℃、滴下時間5~10分)。この溶液を室温で1時間撹拌した後、ろ過、ジクロロメタン洗浄して目的の粗ジエチルスルファミン酸リチウム(9.1g)を得た。得られた粗ジエチルスルファミン酸リチウム(2.0g)をメタノール7mLに60℃で溶解させ、そこへジメチルカーボネート7mLを加えて体積が半分になるまで減圧濃縮した。再度ジメチルカーボネート7mLを加えて減圧濃縮し、固体が析出したところで減圧濃縮を停止してろ過、ジメチルカーボネート洗浄して目的のジエチルスルファミン酸リチウム(0.9g,6mmol、トータル収率38%)を得た。
実施例1~24
エチレンカーボネート(EC)とエチルメチルカーボネート(EMC)の混合物(体積比30:70)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表1に記載の添加化合物(I)を表1に記載の含有量となるよう添加して非水電解液を得た。なお、各表中の各添加化合物の含有量は、最終的に得られる電解液に対する割合を示す。
実施例4において、化合物Aを添加せずに調製し、非水電解液を得た。
実施例4において、化合物Aの代わりに化合物Xを表1に記載の含有量となるよう添加して非水電解液を得た。
実施例4において、化合物Aの代わりに化合物Yを表1に記載の含有量となるよう添加して非水電解液を得た。
ECとEMCとプロピオン酸エチルの混合物(体積比30:40:30)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表2に記載の添加化合物(I)を表2に記載の含有量となるよう添加して非水電解液を得た。
実施例25において、化合物Aを添加せずに調製し、非水電解液を得た。
フルオロエチレンカーボネート(FEC)とメチル2,2,2-トリフルオロエチルカーボネートの混合物(体積比30:70)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表3に記載の添加化合物(I)を表3に記載の含有量となるよう添加して非水電解液を得た。
実施例34において、化合物Aを添加せずに調製し、非水電解液を得た。
トリフルオロプロピレンカーボネートとメチル2,2,2-トリフルオロエチルカーボネートの混合物(体積比30:70)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表4に記載の添加化合物(I)を表4に記載の含有量となるよう添加して非水電解液を得た。
実施例43において、化合物Aを添加せずに調製し、非水電解液を得た。
トリフルオロプロピレンカーボネートとジフルオロ酢酸メチルの混合物(体積比30:70)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表5に記載の添加化合物(I)を表5に記載の含有量となるよう添加して非水電解液を得た。
実施例52において、化合物Aを添加せずに調製し、非水電解液を得た。
フルオロエチレンカーボネート(FEC)とジフルオロ酢酸メチルの混合物(体積比30:70)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表6に記載の添加化合物(I)を表6に記載の含有量となるよう添加して非水電解液を得た。
実施例61において、化合物Aを添加せずに調製し、非水電解液を得た。
フルオロエチレンカーボネート(FEC)と3,3,3-トリフルオロプロピオン酸メチルの混合物(体積比30:70)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表7に記載の添加化合物(I)を表7に記載の含有量となるよう添加して非水電解液を得た。
実施例70において、化合物Aを添加せずに調製し、非水電解液を得た。
フルオロエチレンカーボネート(FEC)と酢酸2,2,2-トリフルオロエチルの混合物(体積比30:70)にLiPF6を1.0モル/リットルの濃度となるように添加して基本電解液とした。更にこの基本電解液に表8に記載の添加化合物(I)を表8に記載の含有量となるよう添加して非水電解液を得た。
実施例79において、化合物Aを添加せずに調製し、非水電解液を得た。
[正極の作製]
表1、2に記載の実施例及び比較例では、正極活物質としてのLi(Ni1/3Mn1/3Co1/3)O2(LNMC)93質量%と、導電材としてのアセチレンブラック3質量%と、結着剤としてのポリフッ化ビニリデン(PVdF)4質量%とを、N-メチルピロリドン溶媒中で混合して、スラリー化した。得られたスラリーを、予め導電助剤を塗布した厚さ15μmのアルミ箔の片面に塗布して、乾燥し、プレス機にてロールプレスしたものを、活物質層のサイズとして幅50mm、長さ30mm、及び幅5mm、長さ9mmの未塗工部を有する形状に切り出して正極とした。
表3~8記載の実施例及び比較例では、正極活物質としてLiMn1.5Ni0.5O4(LNMO)を用いる以外は上記と同様にして、正極を作製した。
表1、3~8に記載の実施例及び比較例では、炭素質材料(グラファイト)98質量部に、増粘剤及びバインダーとして、カルボキシメチルセルロースナトリウムの水性ディスパージョン(カルボキシメチルセルロースナトリウムの濃度1質量%)1質量部及びスチレン-ブタジエンゴムの水性ディスパージョン(スチレン-ブタジエンゴムの濃度50質量%)1質量部を加え、ディスパーザーで混合してスラリー化した。得られたスラリーを厚さ10μmの銅箔に塗布して乾燥し、プレス機で圧延したものを、活物質層のサイズとして幅52mm、長さ32mm、及び幅5mm、長さ9mmの未塗工部を有する形状に切り出して負極とした。
[負極の作製]
表2に記載の実施例及び比較例では、炭素質材料(グラファイト)93質量部とケイ素5質量部に、増粘剤及びバインダーとして、カルボキシメチルセルロースナトリウムの水性ディスパージョン(カルボキシメチルセルロースナトリウムの濃度1質量%)1質量部及びスチレン-ブタジエンゴムの水性ディスパージョン(スチレン-ブタジエンゴムの濃度50質量%)1質量部を加え、ディスパーザーで混合してスラリー化した。得られたスラリーを厚さ10μmの銅箔に塗布して乾燥し、プレス機で圧延したものを、活物質層のサイズとして幅52mm、長さ32mm、及び幅5mm、長さ9mmの未塗工部を有する形状に切り出して負極とした。
上記の正極を厚さ20μmの微孔性ポリエチレンフィルム(セパレータ)を介して正極と負極を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、封止し予備充電、エージングを行い、リチウムイオン二次電池を作製した。
以下の方法で電池特性を測定した。結果を各表に示す。
[初期放電容量の評価]
上記で製造した二次電池を、板で挟み加圧した状態で、25℃において、1Cに相当する電流で表1、2の実施例及び比較例に対応する電池は4.1V、表3~8の実施例及び比較例に対応する電池は4.4Vまで定電流-定電圧充電(以下、CC/CV充電と表記する。)(0.1Cカット)した後、1Cの定電流で3Vまで放電し、これを1サイクルとして、3サイクル目の放電容量から初期放電容量を求めた。
ここで、1Cとは電池の基準容量を1時間で放電する電流値を表わし、例えば、0.2Cとはその1/5の電流値を表わす。
初期放電容量の評価が終了した電池を、25℃にて、1Cの定電流で初期放電容量の半分の容量となるよう充電した。
これを25℃において、2.0Cで放電させ、その10秒時の電圧を測定した。放電時の電圧の降下から抵抗を算出し、IV抵抗とした。
25℃IV抵抗の評価が終了した電池を、25℃にて1Cの定電流で初期放電容量の半分の容量となるよう充電し、0℃環境に3時間放置した。
0℃にて10mVの交流電圧振幅を印加することで電池のインピーダンスを測定し、0.1Hzの実軸抵抗を求めた。
0℃インピーダンスの評価が終了した電池を再度用いて、25℃において表1、2の実施例及び比較例に対応する電池は4.1V、表3~8の実施例及び比較例に対応する電池は4.4VまでCC/CV充電(0.1Cカット)を行い、電池の体積を求めた。
電池の体積を求めた後、85℃72時間の条件で高温保存を行った。高温保存終了後、25℃において電池の体積を求め、保存試験前後の電池の体積差からガス量を求めた。ガス量を求めた後、25℃において1Cで3Vまで放電を行い、残存容量を求めた。
初期放電容量に対する高温保存後の残存容量の割合を求め、これを容量維持率(%)とした。
(残存容量)/(初期放電容量)×100=容量維持率(%)
Claims (5)
- 下記一般式(1)で表される化合物を含むことを特徴とする電解液。
一般式(1):
-H、
-F、
式:-Op101-(SiR103 2O)n101-SiR104 3(R103及びR104は、互いに独立に、一つ以上の水素がフッ素に置換されていてもよいアルキル基、一つ以上の水素がフッ素に置換されていてもよいアルケニル基、一つ以上の水素がフッ素に置換されていてもよいアルキニル基又は一つ以上の水素がフッ素に置換されていてもよいアリール基、n101は0以上の整数であり、p101は0又は1である。)で示される基、
炭素数1~7のアルキル基、
炭素数2~7のアルケニル基、
炭素数2~7のアルキニル基、
炭素数6~15のアリール基、
-SO2X101(X101は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、
-SO3X102(X102は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、又は、
R101とR102が結合して環状構造を形成し該環状構造中に多重結合を含んでもよい炭素数2~7の炭化水素基である置換基であって、
前記置換基はそれらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
但し、R101及びR102の両方がアルキル基である場合は、少なくとも一方がその構造中に一つ以上の2~6価のヘテロ原子を含む、又は、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されている。) - 請求項1記載の電解液を備えることを特徴とする電気化学デバイス。
- 請求項1記載の電解液を備えることを特徴とするリチウムイオン二次電池。
- 請求項2記載の電気化学デバイス、又は、請求項3記載のリチウムイオン二次電池を備えることを特徴とするモジュール。
- 下記一般式(1-1)で表されることを特徴とする化合物。
一般式(1-1):
-H、
-F、
式:-Op101-(SiR103 2O)n101-SiR104 3(R103及びR104は、互いに独立に、一つ以上の水素がフッ素に置換されていてもよいアルキル基、一つ以上の水素がフッ素に置換されていてもよいアルケニル基、一つ以上の水素がフッ素に置換されていてもよいアルキニル基又は一つ以上の水素がフッ素に置換されていてもよいアリール基、n101は0以上の整数であり、p101は0又は1である。)で示される基、
炭素数1~7のアルキル基、
炭素数2~7のアルケニル基、
炭素数2~7のアルキニル基、
炭素数6~15のアリール基、
-SO2X101(X101は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)、又は、
-SO3X102(X102は、-H、-F、又は、一つ以上の水素がフッ素に置換されていてもよいアルキル基である。)である置換基であって、
前記置換基はそれらの構造中に一つ以上の2~6価のヘテロ原子を含んでいてもよく、一つ以上の水素がフッ素又は炭素数0~7の官能基に置換されていてもよい。
但し、R201及びR202の少なくとも一方は-Fである。)
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WO2020241161A1 (ja) * | 2019-05-31 | 2020-12-03 | 株式会社日本触媒 | 電解質組成物、溶媒組成物、非水電解液及びその用途 |
WO2021235358A1 (ja) | 2020-05-22 | 2021-11-25 | ダイキン工業株式会社 | 電解液、電気化学デバイス、リチウムイオン二次電池、モジュール及び化合物 |
WO2021235357A1 (ja) | 2020-05-22 | 2021-11-25 | ダイキン工業株式会社 | 電解液、電気化学デバイス、リチウムイオン二次電池及びモジュール |
WO2022172951A1 (ja) | 2021-02-10 | 2022-08-18 | ダイキン工業株式会社 | 化合物、組成物、電気化学デバイス、リチウムイオン二次電池及びモジュール |
EP4064407A4 (en) * | 2020-02-27 | 2023-11-01 | Nippon Shokubai Co., Ltd. | COMPOSITION, ELECTROLYTIC SOLUTION MATERIAL AND ELECTROLYTE SOLUTION |
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US11916195B2 (en) | 2018-03-27 | 2024-02-27 | Daikin Industries, Ltd. | Electrolyte solution, electrochemical device, lithium ion secondary battery, and module |
KR102542791B1 (ko) * | 2018-03-27 | 2023-06-14 | 다이킨 고교 가부시키가이샤 | 술팜산리튬의 제조 방법 및 신규 술팜산리튬 |
KR102668159B1 (ko) * | 2019-02-27 | 2024-05-23 | 다이킨 고교 가부시키가이샤 | 전해액, 전기 화학 디바이스, 리튬 이온 이차 전지 및 모듈 |
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WO2022172951A1 (ja) | 2021-02-10 | 2022-08-18 | ダイキン工業株式会社 | 化合物、組成物、電気化学デバイス、リチウムイオン二次電池及びモジュール |
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Publication number | Publication date |
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EP3761435A4 (en) | 2022-01-12 |
CN111919326B (zh) | 2024-06-11 |
PL3761435T3 (pl) | 2023-02-06 |
KR102533995B1 (ko) | 2023-05-19 |
JPWO2019188207A1 (ja) | 2021-01-14 |
EP3761435B1 (en) | 2022-09-28 |
JP7164821B2 (ja) | 2022-11-02 |
CN111919326A (zh) | 2020-11-10 |
HUE061383T2 (hu) | 2023-06-28 |
EP3761435A1 (en) | 2021-01-06 |
US20210028492A1 (en) | 2021-01-28 |
KR20200134295A (ko) | 2020-12-01 |
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