WO2021221113A1 - 複合体、ポリマー電解質、電気化学デバイス、ポリマー系固体電池及びアクチュエーター - Google Patents
複合体、ポリマー電解質、電気化学デバイス、ポリマー系固体電池及びアクチュエーター Download PDFInfo
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- WO2021221113A1 WO2021221113A1 PCT/JP2021/017014 JP2021017014W WO2021221113A1 WO 2021221113 A1 WO2021221113 A1 WO 2021221113A1 JP 2021017014 W JP2021017014 W JP 2021017014W WO 2021221113 A1 WO2021221113 A1 WO 2021221113A1
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- 239000005518 polymer electrolyte Substances 0.000 title claims description 27
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 95
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- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
- C08F214/265—Tetrafluoroethene with non-fluorinated comonomers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/19—Quaternary ammonium compounds
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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
- H01M2300/002—Inorganic 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
- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
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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
-
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present disclosure relates to complexes, polymer electrolytes, electrochemical devices, polymer solid state batteries and actuators.
- Patent Document 1 describes 35 to 99 mol% of repeating units derived from vinylidene fluoride, 1 to 50 mol% of repeating units derived from tetrafluoroethylene, and 0 to 20 mol% of monomers copolymerizable with these.
- a polymer electrolyte obtained by impregnating a vinylidene-based copolymer having a melting point of 80 ° C. or higher and a crystallinity of 20 to 80% with a non-aqueous electrolyte is disclosed.
- Patent Document 2 discloses a composition comprising a vinylidene fluoride-tetrafluoroethylene copolymer obtained by copolymerizing 1 to 15% by mass of tetrafluoroethylene and an organic solvent capable of dissolving a lithium salt.
- Patent Document 3 discloses a fluorine-containing copolymer that requires a copolymer of a fluoromonomer and a polymerizable vinyl compound having an amide group.
- Patent Document 4 discloses a fluorine-containing copolymer composed of a polymerization unit based on a fluorine-containing monomer and a polymerization unit having a —SO 3 Li group in a side chain.
- Patent Document 5 discloses a polymer having a fluorine-containing olefin unit and a vinyl alcohol unit.
- An object of the present disclosure is to provide a complex that can be suitably used as an electrolyte in a polymer-based solid-state battery, and various electrochemical devices using the complex.
- This disclosure is A complex containing a fluorine-containing copolymer, an alkali metal salt, and an ionic liquid.
- the fluorine-containing copolymer is Structural unit represented by the general formula (1): -[CR 1 R 2 1 CR 3 R 4 ]-(1) (In the formula, R 1 to R 4 are H, F, Cl, CF 3 , OR 10 (R 10 is an organic group having 1 to 8 carbon atoms) independently of each other.
- R 1 to R 4 One is F
- R 5 to R 8 are H, F, an alkyl group having 1 to 3 carbon atoms, a functional group containing a hetero atom other than a fluorine atom, or a group containing the functional group, independently of each other. . provided that at least one of R 5 ⁇ R 8 is a functional group or a group containing a functional group containing a hetero atom other than a fluorine atom.
- the a fluorine-containing copolymer as essential,
- the complex is characterized in that the volatile component is 0.1% by mass or less with respect to the entire complex.
- the structural unit represented by the general formula (1) is preferably a tetrafluoroethylene unit.
- the structural units represented by the general formula (2) are vinylpyrrolidone, vinyl alcohol, the monomer represented by the general formula (3), the monomer represented by the general formula (4), and the general. It is preferably at least one selected from the group consisting of the monomers represented by the formula (5).
- X represents H or F
- n represents an integer of 1 to 8.
- R 20 represents H or an alkyl group having 1 to 10 carbon atoms.
- X represents H or F
- Y 1 represents F, Cl or CF 3
- Y 2 represents F or Cl
- k and m represent integers of 0 to 2.
- M represents an alkali metal.
- X represents H or F
- Y 1 represents F, Cl or CF 3
- Y 2 represents F or Cl
- k and m represent integers of 0 to 2.
- M represents an alkali metal.
- the fluorine-containing copolymer has a structural unit content of 1 to 60 mol% represented by the general formula (1) and a constituent unit content of 40 to 99 mol% represented by the general formula (2). It is preferably in the composition range.
- the fluorine-containing copolymer may have a crosslinked chain.
- the alkali metal salt is preferably at least one lithium salt selected from LiPF 6 , LiBF 4 , LiTFSI, LiFSI, LiPO 2 F 2, and LiBOB.
- the alkali metal salt is preferably contained in a proportion of 0.1 to 90% by mass with respect to the fluorine-containing copolymer.
- Ionic liquids are 1-butyl-3-methylimidazolium as the organic cation (BMI) cation, or N- methyl-N- butyl chromatography pyrrolidium (Pyr14) cation, BF 4 anion as an anion, or bis (trifluoromethanesulfonyl ) It is preferably at least one selected from a combination of imide (TFSI) anions.
- the ionic liquid is preferably contained in a proportion of 1.0 to 500% by mass with respect to the fluorine-containing copolymer.
- the complex is preferably flame-retardant.
- the present disclosure is also a polymer electrolyte characterized by comprising the complex described above.
- the present disclosure is also an electrochemical device characterized by comprising the above-mentioned polymer electrolyte.
- the present disclosure is also a polymer-based solid-state battery characterized by comprising the above-mentioned polymer electrolyte.
- the polymer-based solid battery is preferably a lithium ion secondary battery.
- the present disclosure is also an actuator characterized by comprising the above-mentioned polymer electrolyte.
- the composite of the present disclosure is a copolymer composition having excellent oxidation resistance, flame retardancy, etc., it can be suitably used as an electrolyte in an electrochemical device such as a solid secondary battery.
- polymer-based solid-state batteries have been developed as a kind of solid-state batteries.
- the polymer-based solid-state battery is usually provided with a polymer electrolyte composed of a polymer, an electrolyte, an additive, a plasticizer, an electrolytic solution, etc., and has an advantage of having high safety because there is no risk of liquid leakage. be.
- Fluorine-containing polymers have also been developed as polymers used in the above polymer electrolytes. Since the fluorine-containing polymer is a component having excellent oxidation resistance, flame retardancy, etc., it has advantages such as being hard to ignite and being able to apply a roll-to-roll method. An object of the present disclosure is to develop a complex having performance as a fluorine-containing polymer and excellent flame retardancy.
- the complex of the present disclosure is a structural unit represented by the general formula (1): -[CR 1 R 2 1 CR 3 R 4 ]-(1) (In the formula, R 1 to R 4 are independent of each other, H, F, Cl, CF 3 , OR 10 (R 10 is an organic group having 1 to 8 carbon atoms. However, those containing a hetero atom other than fluorine are excluded.
- R 1 to R 4 is F
- R 1 to R 4 is F
- R 5 to R 8 are H, F, an alkyl group having 1 to 3 carbon atoms, a functional group containing a hetero atom other than a fluorine atom, or a group containing the functional group, independently of each other.
- at least one of R 5 to R 8 contains a fluorine-containing copolymer that requires a functional group containing a hetero atom other than a fluorine atom or a group containing the functional group).
- a polymer having a structural unit having a functional group containing a heteroatom has a good dissolving ability of an alkali metal salt. This makes it possible to obtain a complex having excellent performance as a polymer electrolyte. Furthermore, such polymer electrolytes can be suitably used in various electrochemical devices.
- the structural unit represented by the general formula (1) in the present disclosure is a structure derived from a general monomer widely used in fluororesins.
- Specific examples of the constituent unit include tetrafluoroethylene, vinylidene fluoride, perfluoroalkyl vinyl ether, hexafluoropropylene, chlorotrifluoroethylene, vinyl fluoride and the like.
- the polymer of the present disclosure is a copolymer in which the structural unit represented by the general formula (1) is used in combination with the structural unit represented by the general formula (1) described above. -[CR 5 R 6- CR 7 R 8 ]-(2)
- the structural unit represented by the general formula (2) has a functional group having a hetero atom.
- the structural unit represented by the general formula (1) does not correspond to the structural unit represented by the general formula (2).
- the hetero atom may be a hetero atom other than a fluorine atom, but is preferably a hetero atom other than a halogen atom, and is selected from the group consisting of an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, a boron atom and a phosphorus atom. It is more preferably 2 or less, and more preferably 2 or less selected from the group consisting of an oxygen atom, a nitrogen atom, a sulfur atom and a silicon atom, and more preferably selected from the group consisting of an oxygen atom and a nitrogen atom. It is particularly preferable that the number is 2 or less. In addition, "two kinds or less" means one kind or two kinds.
- heteroatom may be other than a fluorine atom
- the “functional group having a heteroatom” may have both a “heteroatom” and a fluorine atom.
- Examples of the functional group having a hetero atom include a hydroxyl group (excluding the hydroxyl group in the carboxyl group; the same applies hereinafter), a carboxyl group, a urethane group, an amide group, a carbonyl group, a carbonate group, an ester group, an ether group, an amino group, and an isocyanate group. , -COOCO-, a mercapto group, a silyl group, a silanate group, an epoxy group, a cyano group and the like can be mentioned.
- the functional group at least one selected from the group consisting of a hydroxyl group, an amide group, an ether group and an ester group is preferable.
- the functional group having a hetero atom is a structure derived from a monomer having a functional group having a hetero atom.
- the structures of the above-mentioned general formula (2) of the hydroxyl group, the amide group, the ether group, and the ester group, which are particularly suitable functional groups, will be described in detail as the structures of the monomers derived from each.
- amide group-containing monomer examples include N-vinyl- ⁇ -propiolactam, N-vinyl-2-pyrrolidone, N-vinyl- ⁇ -valerolactam, N-vinyl-2-piperidone, and N-vinyl-heptalactam.
- N-vinyllactam compounds such as N-vinyllactam compounds, N-vinylformamide, acyclic N-vinylamide compounds such as N-methyl-N-vinylacetamide, acyclic N-allylamides such as N-allyl-N-methylformamide, allylurea, etc.
- Examples thereof include compounds, N-allylactam compounds such as 1- (2-propenyl) -2-pyrrolidone, and acrylamide compounds such as (meth) acrylamide, N, N-dimethylacrylamide, and N-isopropylacrylamide.
- the following general formula (6) is also used.
- R 11 and R 12 are independently H or an alkyl group having 1 to 10 carbon atoms). In the above formula, R 11 and R 12 may be combined with each other to form a ring.
- an N-vinyllactam compound or an acyclic N-vinylamide compound is preferable, and N-vinyl- ⁇ -propiolactam, N-vinyl-2-pyrrolidone, and N-vinyl are preferable.
- At least one selected from the group consisting of - ⁇ -valerolactam, N-vinyl-2-piperidone, and N-vinyl-heptalactam is more preferable, and N-vinyl-2-pyrrolidone and N-vinyl-2 are more preferable.
- At least one selected from the group consisting of -piperidone is more preferable, and N-vinyl-2-pyrrolidone is particularly preferable.
- the ether group-containing monomer excludes the functional group represented by OR 10 in the general formula (1). Further, in the ether group, a part or all of hydrogen may be substituted with a fluorine atom.
- the ether group-containing monomer comprises a monomer represented by the general formula (3), a monomer represented by the general formula (4), and a monomer represented by the general formula (5). It is preferable that the structure is derived from at least one selected from the group.
- X represents H or F
- n represents an integer of 1 to 8.
- R 20 represents H or an alkyl group having 1 to 10 carbon atoms.
- X represents H or F
- Y 1 represents F, Cl or CF 3
- Y 2 represents F or Cl
- k and m represent integers of 0 to 2.
- M represents an alkali metal.
- X represents H or F
- Y 1 represents F, Cl or CF 3
- Y 2 represents F or Cl
- k and m represent integers of 0 to 2.
- M represents an alkali metal.
- Examples of the monomer having the structure represented by the general formula (3) include 2-hydroxyethyl vinyl ether, diethylene glycol monovinyl ether, triethylene glycol monovinyl ether, tetraethylene glycol monovinyl ether, pentaethylene glycol monovinyl ether, and hexaethylene glycol.
- Examples of the monomer forming the structure represented by the general formula (4) include lithium trifluorovinyloxytetrafluoroethanesulfonate (CF 2 CFOCF 2 CF 2 SO 3 Li). Examples of the monomer results in a structure represented by the general formula (5) include a trifluorovinyloxy tetrafluoro lithium propanoate (CF 2 CFOCF 2 CF 2 COOLi ) and the like.
- the structural unit represented by the general formula (1) is referred to as the structural unit (hereinafter, structural unit (1)) with respect to all the structural units. Is 99.9 to 0.1 mol%, and the structural unit represented by the general formula (2) (hereinafter, structural unit (2)) is preferably 0.1 to 99.9 mol%. Further, it is more preferable that the structural unit (1) is 65 to 7 mol% and the structural unit (2) is 35 to 93 mol%. Further, it is more preferable that the structural unit (1) is 55 to 15 mol% and the structural unit (2) is 45 to 85 mol%. Further, it is particularly preferable that the structural unit (1) is 50 to 20 mol% and the structural unit (2) is 50 to 80 mol%.
- the molar ratio ((1) / (2)) of the structural unit (1) to the structural unit (2) is preferably in the range of 0.07 to 1.86, and is 0.17 to 1. Those in the range of .23 are more preferable. More preferably, it is in the range of 0.25 to 1.00.
- the fluorine-containing copolymer may be substantially composed of only the structural units (1) and (2).
- the fluorine-containing copolymer may have a structural unit other than the structural units (1) and (2) as long as the effect of the complex of the present disclosure is not impaired.
- the other structural unit include a structure derived from a fluoromonomer other than the structure represented by the above general formula (1), a functional group-containing monomer other than the above-mentioned heterogroup-containing monomer, a halogen atom, and the like.
- Examples thereof include structural units based on olefins that do not contain hydroxyl groups, vinyl monomers having long-chain hydrocarbon groups, and the like.
- the sum of the other structural units may be 0-50 mol%, 0-40 mol%, 0-30 mol%, 0-15 mol%, 0. It may be up to 5 mol%.
- Alkyl vinyl ether, fluoroalkylethylene, trifluoropropylene, pentafluoropropylene, trifluorobutene, tetrafluoroisobutene, hexafluoroisobutene, trifluorostyrene and the like are preferable.
- olefin containing no halogen atom and hydroxyl group examples include non-fluorine-based olefins such as ethylene, propylene, n-butene and isobutylene.
- the structural unit represented by the general formula (2) is used as the copolymerization component in the known fluorine polymer based on the structural unit represented by the general formula (1). Is preferable. Therefore, a copolymer resin using the structural unit represented by the general formula (1) may be used as the basic skeleton.
- a polymer having a fluorine atom can be widely used as the fluorine-containing polymer having the structural unit represented by the general formula (1) as the basic skeleton.
- a polymer having a fluorine atom can be widely used.
- the fluorine-containing copolymer blended in the complex of the present disclosure may have a crosslinked chain. Having a crosslinked chain is preferable in that the strength of the film can be maintained.
- polymers such as vinylpyrrolidone and triethylene glycol monovinyl ether tend to have a low strength, so it is preferable that the polymer has a crosslinked chain as a part.
- the fluorine-containing copolymer preferably has a number average molecular weight of 10,000 to 1.2 million. If the number average molecular weight exceeds 1.2 million, the dissolution viscosity becomes remarkably high, which makes workability poor and the electrical conductivity of the polymer electrolyte is lowered, which is not preferable. On the other hand, if it is less than 10,000, the mechanical strength of the polymer electrolyte is significantly lowered, which is not preferable.
- the number average molecular weight is particularly preferably 40,000 to 1.1 million.
- the above number average molecular weight is a value measured by a GPC (gel permeation chromatography) method, and for example, the number average molecular weight can be calculated with reference to standard polystyrene by the method shown below.
- the column Using HLC-8020 manufactured by TOSOH, the column should be three polystyrene gel MIX columns (Tosoh GMH series, 30 cm size), 40 ° C., NMP (containing 5 mmol / L LiBr) solvent, and a flow rate of 0.7 mL / min. Can be done.
- the sample concentration can be 0.1% by mass and the driving amount can be 500 ⁇ L.
- the number average molecular weight (in terms of polystyrene) is preferably 10,000 to 12000000, and more preferably 40,000 to 110000.
- composition of the fluorine-containing copolymer can be measured, for example, by 19 F-NMR measurement.
- the method for producing the fluorine-containing polymer is not particularly limited, and the method can be carried out by a method such as radical polymerization of the fluorine-containing polymer for each of the above-mentioned monomers.
- the radical polymerization is preferably carried out by adding a polymerization initiator.
- the polymerization initiator is not particularly limited as long as it can generate radicals at the polymerization temperature, and known oil-soluble and / or water-soluble polymerization initiators can be used. You may also use a redox initiator.
- the concentration of the polymerization initiator is appropriately determined depending on the molecular weight and reaction rate of the target fluorine-containing copolymer.
- the amount of the radical polymerization initiator added is not particularly limited, but an amount (for example, several ppm to water concentration) or more that does not significantly reduce the polymerization rate is collectively, sequentially, or continuously at the initial stage of polymerization. And add it.
- the upper limit is the range in which the heat of the polymerization reaction can be removed from the device surface.
- the surfactant generally known materials such as a nonionic surfactant, an anionic surfactant, and a cationic surfactant can be used.
- the amount added is preferably 10 to 5000 ppm. More preferably, it is 50 to 5000 ppm.
- the solvent is preferably a solvent having no chain transfer.
- water, a mixture of water and a water-soluble organic solvent, or a mixture of water and a water-insoluble organic solvent can be mentioned.
- examples of the chain transfer agent include esters such as dimethyl malonate, diethyl malonate, methyl acetate, ethyl acetate, butyl acetate and dimethyl succinate, as well as isopentane, methane, ethane, propane, isopropanol and acetone. , Various mercaptans, carbon tetrachloride, cyclohexane and the like.
- a bromine compound or an iodine compound may be used as the chain transfer agent.
- Examples of the polymerization method using a bromine compound or an iodine compound include a method of performing emulsion polymerization in an aqueous medium under pressure in the presence of a bromine compound or an iodine compound in a substantially anoxic state. (Iodine transfer polymerization method).
- Typical examples of the bromine compound or iodine compound used include, for example, the general formula: R 2 I x Br y (In the formula, x and y are integers of 0 to 2, respectively, and satisfy 1 ⁇ x + y ⁇ 2, and R 2 is a saturated or unsaturated fluorohydrocarbon group having 1 to 16 carbon atoms or chlorofluoro. Examples thereof include a compound represented by a hydrocarbon group or a hydrocarbon group having 1 to 3 carbon atoms and may contain an oxygen atom).
- a bromine compound or an iodine compound iodine or bromine is introduced into the polymer and functions as a cross-linking point.
- Examples of the iodine compound include 1,3-diiodoperfluoropropane, 2-iodoperfluoropropane, 1,3-diiodo-2-chloroperfluoropropane, 1,4-diiodoperfluorobutane, and 1,5-.
- 1,4-diiodoperfluorobutane, 1,6-diiodoperfluorohexane, and 2-iodoperfluoropropane are used from the viewpoints of polymerization reactivity, cross-linking reactivity, availability, and the like. Is preferable.
- the fluorine-containing copolymer may be in any form such as an aqueous dispersion or a powder.
- the copolymer powder can be obtained by coagulating the dispersion liquid after polymerization, washing with water, dehydrating and drying. The coagulation can be carried out by adding an inorganic salt or an inorganic acid such as aluminum sulfate, applying a mechanical shearing force, or freezing the dispersion.
- suspension polymerization it can be obtained by recovering from the dispersion liquid after polymerization and drying.
- solution polymerization it can be obtained by drying the solution containing the fluorine-containing polymer as it is, or by dropping a poor solvent and purifying it.
- the fluorine-containing copolymer may have a crosslinked chain.
- the method for forming the crosslinked chain is not particularly limited, but for example, the crosslinked initiator is mixed with the polymer, and then heating or light irradiation is performed in any step of forming the complex. As a result, a crosslinked chain may be formed.
- cross-linking initiator a cross-linking initiator usually used when performing cross-linking can be used. Specifically, in addition to acetophenones such as chloroacetophenone, diethoxyacetophenone, and ⁇ -aminoacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2.
- acetophenones such as chloroacetophenone, diethoxyacetophenone, and ⁇ -aminoacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2.
- -Acetophenone-based initiators such as hydroxyacetophenones such as -hydroxy-2-methylpropane-1-one and 1-hydroxycyclohexylphenylketone; Aminophenone-based initiators; Benzophenone-based initiators such as benzoin, benzoin ether and benzyl dimethyl ketal Benzophenone-based initiators such as benzophenone, benzoylbenzoic acid, hydroxybenzophenone, 4-phenylbenzophenone, and acrylicized benzophenone; thioxanthone-based initiators such as thioxanthone, 2-methylthioxanthone, and 2,4-dimethylthioxanthone; and other ⁇ -Acyloxime ester, acylphosphine oxide, benzyl, phenylquinone, 2-ethylanthraquinone, Michler ketone and the like.
- the amount of the cross-linking initiator to be blended in the fluorine polymer composition is preferably 0.05 to 10 parts by mass with respect to 100 parts by mass of the cross-linkable fluorine polymer.
- the cross-linking can be sufficiently advanced. More preferably, it is 1 to 5 parts by mass.
- the fluorine polymer composition preferably further contains a photosensitizer, a surfactant and the like, if necessary.
- the above photosensitizer is preferably used when the photobridge initiator is a benzophenone-based initiator or a thioxanson-based initiator, and the photosensitizer includes, for example, an aliphatic amine-based triethanolamine or methyl. Diethanolamine, triisopropanolamine, etc .; aromatic amine-based 4,4'-diethylaminophenone, ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), and 2,4-diethylthioxane. Son and others can be mentioned.
- the blending amount of the photosensitizer is preferably 0.05 to 20 parts by mass with respect to 100 parts by mass of the photocrosslinkable fluorine polymer. , More preferably 0.1 to 10 parts by mass, and even more preferably 0.5 to 5 parts by mass.
- the fluorine-containing copolymer one kind may be used, or two or more kinds may be used.
- a form in which two types of copolymers having different molecular structures are used in combination may be used.
- Examples of the form in which the two types of copolymers having different molecular structures are used in combination include a form in which two types of copolymers (I) having different molecular structures are used, and a form in which two types of copolymers (II) having different molecular structures are used. Examples thereof include a form in which one type of copolymer (I) and one type of copolymer (II) are used in combination.
- the complex of the present disclosure contains an alkali metal salt.
- the alkali metal salt can be represented by MX, where M is an alkali metal and X is a substance that becomes a pair of anions.
- the alkali metal salt may be used alone or in the form of a mixture of two or more.
- the alkali metal salt is particularly preferably a lithium salt (that is, a compound represented by LiX).
- lithium salts can be used, and specific examples thereof include the following.
- 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 Lithium carboxylic acid 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 FSO 3 Li, CHF 2 SO 3 Li, CF 3 SO 3 Li, CF 3 CF 2 SO 3 Li, CF 3 CF 2 SO 3 Li,
- electrolyte salts may be used alone or in combination of two or more.
- a preferable example when two or more kinds are used in combination is a combination of LiPF 6 and LiBF 4 or a combination of LiTFSI and LiFSI, which have the effect of improving high temperature storage characteristics, load characteristics and cycle characteristics.
- the blending amount of the alkali metal salt is preferably 0.1% by mass or more, more preferably 1.0% by mass or more, based on 100% by mass of the entire composite. Further, it is preferably 90% by mass or less, more preferably 80% by mass or less, further preferably 70% by mass or less, and particularly preferably 5% by mass or less.
- Organolithium salts include 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-Perfluoropropanedisulfonylimide, 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, etc.
- the ratio of the organolithium salt to 100% by mass of the entire composite is preferably 0.1% by mass or more, particularly preferably 0.5% by mass or more, and preferably 30% by mass or less, particularly. It is preferably 20% by mass or less.
- the concentration of these alkali metal salts in the complex is not particularly limited as long as the effects of the present disclosure are not impaired.
- the total molar concentration of lithium in the complex is preferably 0.3 mol / L or more, more preferably 0.4 mol / L, from the viewpoint of keeping the electrical conductivity of the complex in a good range and ensuring good battery performance. Above, it is more preferably 0.5 mol / L or more, preferably 5.0 mol / L or less, more preferably 4.5 mol / L or less, still more preferably 4.0 mol / L or less.
- the electrical conductivity of the composite may be inadequate, while if the concentration is too high, the electrical conductivity may decrease due to the increased viscosity, resulting in poor battery performance. May be done.
- the complex of the present disclosure further comprises an ionic liquid.
- ionic liquid is a liquid composed of ions in which an organic cation and an anion are combined. By including an ionic liquid, the ionic conductivity can be increased. It is also a preferable feature that there is almost no vapor pressure and it is nonflammable.
- the organic cation is not particularly limited, and examples thereof include imidazolium ions such as dialkyl imidazolium cations and trialkyl imidazolium cations; tetraalkylammonium ions; alkylpyridinium ions; dialkylpyrridinium ions; and dialkylpiperidinium ions. ..
- the anions that serve as counters for these organic cations are not particularly limited, but are, for example, PF 6 anions, PF 3 (C 2 F 5 ) 3 anions, PF 3 (CF 3 ) 3 anions, BF 4 anions, and BF 2 ( CF 3 ) 2 anion, BF 3 (CF 3 ) anion, bisoxalate borate anion, P (C 2 O 4 ) F 2 anion, Tf (trifluoromethanesulfonyl) anion, Nf (nonafluorobutanesulfonyl) anion, bis ( Fluorosulfonyl) imide anion, bis (trifluoromethanesulfonyl) imide (TFSI) anion, bis (pentafluoroethanesulfonyl) imide anion, dicyanoamine anion, and halide anion can be used.
- the ionic liquid preferably does not correspond to a plastic crystal.
- a plastic crystal means a state in which there is regularity in three-dimensional positions, but there is no regularity in particle orientation.
- the content of the ionic liquid is preferably 1.0 to 500% by mass with respect to the fluorine-containing fluoropolymer.
- the lower limit is more preferably 10% by mass, and the upper limit is more preferably 300% by mass.
- metal fillers such as TiO 2 and Al 2 O 3 may be added in order to improve the conductivity.
- the content of the additive is preferably 0.1 to 10% by mass with respect to the fluorine-fluorine copolymer. More preferably, it is 0.2 to 5% by mass.
- the complex of the present disclosure has a volatile component of 0.1% by mass or less with respect to the entire complex. By reducing the amount of such volatile components, there is an advantage of long-term reliability.
- the complex of the present disclosure is preferably flame-retardant. Due to its flame retardancy, it is particularly preferable because it can be safely used in various electrochemical devices.
- flame retardant means that in the evaluation of flame retardancy in the examples described in detail below, it is possible to obtain an evaluation result that there is no transfer from open flame.
- the polymer composition used as an electrolyte for a polymer-based solid-state battery so far contains a volatile component amount of about 10% by mass, which is larger than that of the composite of the present disclosure. Therefore, it has disadvantages such as a limited operating temperature range and inferior long-term reliability.
- the method for adjusting the amount of the volatile component of the complex within the range is not particularly limited, and examples thereof include a method of heating and depressurizing the composite film obtained in the form of a thin film to dry it.
- the amount of volatile components in the present disclosure is a value obtained by the method described later in Examples.
- the method for producing the complex is not particularly limited, and any method can be used for preparation.
- it can be obtained by slurrying the above-mentioned fluorine-containing copolymer, alkali metal salt, ionic liquid, and if necessary, an additive or the like with a solvent, applying the obtained slurry in a thin film, and drying it.
- the solvent for forming such a slurry is not particularly limited as long as it is a solvent capable of dissolving or dispersing each of the above-mentioned components, and either an aqueous solvent or an organic solvent can be used. May be good.
- 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; and ketones such as acetone, methyl ethyl ketone and cyclohexanone.
- esters such as methyl acetate and methyl acrylate
- amines such as diethylenetriamine, N, N-dimethylaminopropylamine
- ethers such as diethyl ether, propylene oxide and tetrahydrofuran (THF); N-methylpyrrolidone (NMP) , Dimethylformamides, dimethylacetamides and the like
- aprotonic polar solvents such as hexamethylphosphalamides and dimethylsulfoxides and the like.
- the complex of the present disclosure can be suitably used as an electrolyte for various electrochemical devices.
- An electrochemical device comprising a polymer electrolyte composed of the complex is also one of the present disclosures.
- the electrochemical device is not particularly limited, and can be applied to conventionally known electrochemical devices.
- secondary batteries such as lithium ion batteries, primary batteries such as lithium batteries, sodium ion batteries, magnesium ion batteries, radical batteries, solar cells (particularly dye-sensitized solar cells), fuel cells;
- Capacitors such as lithium ion capacitors, hybrid capacitors, electrochemical capacitors, electric double layer capacitors; actuators such as cylinders, oscillating motors, and motors;
- Various capacitors such as aluminum electrolytic capacitors and tantalum electrolytic capacitors; Examples thereof include electromic elements, electrochemical switching elements, and various electrochemical sensors.
- the present disclosure is also a secondary solid-state battery comprising the complex of the present disclosure described above as a polymer electrolyte.
- the secondary solid-state battery of the present disclosure includes a positive electrode and a negative electrode composed of a positive electrode or negative electrode active material, a binder, and a current collector, and a polymer electrolyte layer composed of the above-mentioned composite interposed between the positive electrode and the negative electrode. It is a polymer-based solid-state battery provided with. As such a secondary solid-state battery, a lithium ion battery is preferable.
- the positive electrode active material and the negative electrode active material are not particularly limited, and are known electrochemical devices such as lead batteries, Nikkado batteries, nickel hydrogen batteries, lithium ion batteries, secondary batteries such as alkali metal sulfur batteries, and electric double layer capacitors. Can be mentioned as used in.
- the positive electrode active material is not particularly limited, and examples thereof include those used in known electrochemical devices.
- the positive electrode active material of the lithium ion secondary battery is not particularly limited as long as it can electrochemically occlude and release lithium ions.
- a lithium-containing transition metal composite oxide and a lithium-containing transition Examples thereof include metallic phosphoric acid compounds, sulfur-based materials, and conductive polymers.
- a lithium-containing transition metal composite oxide and a lithium-containing transition metal phosphoric acid compound are preferable, and a lithium-containing transition metal composite oxide that produces a high voltage is particularly preferable.
- the transition metal of the lithium-containing transition metal composite oxide is preferably V, Ti, Cr, Mn, Fe, Co, Ni, Cu or the like, and specific examples of the lithium transition metal composite oxide are lithium cobalt such as LiCoO 2.
- substitutions include lithium-nickel-manganese composite oxide, lithium-nickel-cobalt-aluminum composite oxide, lithium-nickel-cobalt-manganese composite oxide, lithium-manganese-aluminum composite oxide, and lithium-titanium.
- examples thereof include composite oxides, and more specifically, LiNi 0.5 Mn 0.5 O 2 , LiNi 0.85 Co 0.10 Al 0.05 O 2 , LiNi 0.33 Co 0.33 Mn 0.
- LiNi 0.5 Mn 0.3 Co 0.2 O 2 LiNi 0.6 Mn 0.2 Co 0.2 O 2 , LiNi 0.8 Mn 0.1 Co 0.1 O 2 , Examples thereof include LiMn 1.8 Al 0.2 O 4 , LiMn 1.5 Ni 0.5 O 4 , Li 4 Ti 5 O 12 , LiNi 0.82 Co 0.15 Al 0.03 O 2.
- the transition metal of the lithium-containing transition metal phosphoric acid compound is preferably V, Ti, Cr, Mn, Fe, Co, Ni, Cu or the like, and specific examples of the lithium-containing transition metal phosphoric acid compound include, for example, LiFePO 4 . li 3 Fe 2 (PO 4) 3, LiFeP 2 O 7 , etc. of phosphorus Santetsurui, cobalt phosphate such as LiCoPO 4, a part of the transition metal atom comprised mainly of these lithium transition metal phosphate compound Al , Ti, V, Cr, Mn, Fe, Co, Li, Ni, Cu, Zn, Mg, Ga, Zr, Nb, Si and the like substituted with other metals.
- LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiNi 0.82 Co 0.15 Al 0.03 O 2 , LiNi 0.33 Mn 0.33 Co 0.33 O 2 , LiNi 0.5 Mn 0.3 Co 0.2 O 2 , LiNi 0.6 Mn 0.2 Co 0.2 O 2 , LiNi 0.8 Mn 0.1 Co 0.1 O 2 and LiFePO 4 are preferable.
- a material containing a sulfur atom can be exemplified, and at least one selected from the group consisting of elemental sulfur, metal sulfide, and an organic sulfur compound is preferable, and elemental sulfur is more preferable.
- the metal sulfide may be a metal polysulfide.
- the organic sulfur compound may be an organic polysulfide.
- Examples of the metal sulfide include a compound represented by LiS x (0 ⁇ x ⁇ 8); a compound represented by Li 2 S x (0 ⁇ x ⁇ 8); a two-dimensional layered structure such as TiS 2 or MoS 2. compounds having; (is Me Pb, Ag, various transition metals, including Cu) general formula Me x Mo 6 S 8 Shubureru compound having a strong three-dimensional skeleton structure represented by and the like.
- organic sulfur compound examples include carbon sulfide compounds.
- the organic sulfur compound may be carried on a material having pores such as carbon and used as a carbon composite material.
- the content of sulfur contained in the carbon composite material is preferably 10 to 99% by mass, more preferably 20% by mass or more, based on the above carbon composite material, because the cycle performance is further excellent and the overvoltage is further reduced. It is preferable, more preferably 30% by mass or more, particularly preferably 40% by mass or more, and preferably 85% by mass or less.
- the positive electrode active material is the elemental sulfur
- the content of sulfur contained in the positive electrode active material is equal to the content of the elemental sulfur.
- 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-based, polyphenylene-based, heterocyclic polymers, ionic polymers, rudder and network-like polymers.
- one type of positive electrode active material may be used alone, or two or more types having different compositions or different powder physical characteristics may be used in combination in any combination and ratio.
- the positive electrode preferably further contains a binder, a thickener, a conductive auxiliary agent, and the like.
- a binder any material can be used as long as it is a material that is safe for the solvent and electrolytic solution used in the manufacture of the electrode.
- polyvinylidene fluoride, polytetrafluoroethylene, polyethylene, polypropylene can be used.
- SBR styrene / butadiene rubber
- isoprene rubber butadiene rubber
- butadiene rubber ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, polyethylene terephthalate, polymethylmethacrylate, polyimide, aromatic polyamide, cellulose, nitrocellulose, NBR (Acrylonitrile-butadiene rubber), fluororubber, ethylene-propylene rubber, styrene / butadiene / styrene block copolymer or hydrogen additive thereof, EPDM (ethylene / propylene / diene ternary copolymer), styrene / ethylene / butadiene / Ethylene copolymer, styrene / isoprene / styrene block copolymer or hydrogen additive thereof, syndiotactic-1,2-polybutadiene, polyvinyl acetate,
- 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 the proportion of the binder in the positive electrode active material layer. , Usually 80% by mass or less, preferably 60% by mass or less, more preferably 40% by mass or less, and most preferably 10% by mass or less. If the proportion of the binder is too low, the positive electrode active material cannot be sufficiently retained, the mechanical strength of the positive electrode is insufficient, and the battery performance such as cycle characteristics may be deteriorated. On the other hand, if it is too high, it may lead to a decrease in battery capacity and conductivity.
- thickener examples include carboxymethyl cellulose, methyl cellulose, hydroxymethyl cellulose, ethyl cellulose, polyvinyl alcohol, oxidized starch, phosphorylated starch, casein and salts thereof.
- One type may be used alone, or two or more types may be used in any combination and ratio.
- the ratio of the thickener to the positive electrode 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 5% by mass or less. It is in the range of 3% by mass or less, more preferably 2% by mass or less. Below this range, the coatability may be significantly reduced. If it exceeds, the ratio of the active material to the positive electrode active material layer decreases, which may cause a problem that the capacity of the battery decreases and a problem that the resistance between the positive electrode active materials increases.
- the conductive auxiliary agent is not particularly limited as long as it can improve the conductivity of the electrolyte, but for example, carbon black such as acetylene black and ketjen black; multi-walled carbon nanotubes, single-walled carbon nanotubes, carbon nanofibers, etc. Examples thereof include carbon fibers such as graphene and vapor-grown carbon fibers (VGCF); metal powders such as SUS powder and aluminum powder; and the like.
- carbon black such as acetylene black and ketjen black
- multi-walled carbon nanotubes single-walled carbon nanotubes, carbon nanofibers, etc.
- Examples thereof include carbon fibers such as graphene and vapor-grown carbon fibers (VGCF); metal powders such as SUS powder and aluminum powder; and the like.
- 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 active material is not particularly limited, and examples thereof include those used in known electrochemical devices.
- the negative electrode active material of the lithium ion secondary battery is not particularly limited as long as it can electrochemically occlude and release lithium ions.
- Specific examples include carbonaceous materials, alloy-based materials, lithium-containing metal composite oxide materials, conductive polymers, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more types arbitrarily.
- a carbonaceous material capable of storing and releasing lithium artificial graphite or purified natural graphite produced by high-temperature treatment of easy-to-graphite pitch obtained from various raw materials, or surface treatment of these graphites with pitch or other organic substances.
- the carbonaceous material and the negative electrode active material layer obtained by subjecting natural graphite, artificial graphite, artificial carbonaceous material, and artificial graphite material to heat treatment at least once in the range of 400 to 3200 ° C. are preferable.
- a carbonaceous material consisting of at least two or more different crystalline carbonaceous materials and / or having an interface in which the different crystalline carbonaceous materials are in contact, the negative electrode active material layer has at least two or more different orientations.
- a material selected from a carbonaceous material having an interface in contact with the carbonaceous material is more preferable because it has a good balance between initial irreversible capacitance and high current density charge / discharge characteristics.
- one of these carbon materials may be used alone, or two or more of these carbon materials may be used in any combination and ratio.
- Examples of the carbonaceous material obtained by heat-treating the above-mentioned artificial carbonaceous material and artificial graphite material at least once in the range of 400 to 3200 ° C. include carbon nanotubes, graphene, coke-based coke, petroleum-based coke, coal-based pitch, and petroleum-based pitch. And those obtained by oxidizing these pitches, needle coke, pitch coke and carbon agents obtained by partially graphitizing them, thermal decomposition products of organic substances such as furnace black, acetylene black, and pitch-based carbon fibers, carbonizable organic substances, and these.
- Examples thereof include a solution obtained by dissolving a carbonized substance or a carbonizable organic substance in a low molecular weight organic solvent such as benzene, toluene, xylene, quinoline and n-hexane, and carbonized products thereof.
- a low molecular weight organic solvent such as benzene, toluene, xylene, quinoline and n-hexane, and carbonized products thereof.
- the metal material used as the negative electrode active material if lithium can be stored and released, lithium alone, a single metal and alloy forming a lithium alloy, or oxidation thereof. It may be any compound such as a substance, a carbide, a nitride, a silicide, a sulfide or a phosphor, and is not particularly limited.
- the single metal and alloy forming the lithium alloy are preferably materials containing group 13 and group 14 metal / metalloid elements, and more preferably aluminum, silicon and tin (hereinafter, abbreviated as "specific metal element"). ) Is a single metal and an alloy or compound containing these atoms. One of these may be used alone, or two or more thereof may be used in any combination and ratio.
- the negative electrode active material having at least one atom selected from the specific metal element, the metal single compound of any one specific metal element, the alloy consisting of two or more specific metal elements, or one or two or more specific ones are specified. Alloys consisting of metal elements and other one or more metal elements, compounds containing one or more specific metal elements, and oxides, carbides, nitrides, and silicates of the compounds. , Complex compounds such as sulfides or phosphors. By using these metal simple substances, alloys or metal compounds as the negative electrode active material, it is possible to increase the capacity of the battery.
- the metal particles that can be alloyed with Li any conventionally known metal particles can be used, but from the viewpoint of capacity and cycle life, the metal particles are, for example, Fe, Co, Sb, Bi, Pb, Ni, Ag. , Si, Sn, Al, Zr, Cr, P, S, V, Mn, Nb, Mo, Cu, Zn, Ge, In, Ti and the like, preferably a metal selected from the group or a compound thereof.
- an alloy composed of two or more kinds of metals may be used, and the metal particles may be alloy particles formed by two or more kinds of metal elements.
- a metal selected from the group consisting of Si, Sn, As, Sb, Al, Zn and W or a metal compound thereof is preferable.
- the metal compound include metal oxides, metal nitrides, metal carbides and the like.
- an alloy composed of two or more kinds of metals may be used.
- a compound in which these composite compounds are complicatedly bonded to several kinds of elements such as elemental metals, alloys or non-metal elements can also be mentioned.
- elements such as elemental metals, alloys or non-metal elements
- silicon and tin an alloy of these elements and a metal that does not act as a negative electrode can be used.
- tin it is possible to use 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 act as a negative electrode, and a non-metal element. can.
- Si or a Si metal compound is preferable.
- the Si metal compound is preferably a Si metal oxide.
- Si or a Si metal compound is preferable in terms of increasing the capacity.
- Si or Si metal compounds are collectively referred to as Si compounds.
- the Si compound is preferably a Si metal oxide, and the Si metal oxide is SiOx in the general formula. This general formula SiOx is obtained by using silicon dioxide (SiO2) and metal Si (Si) as raw materials, and the value of x is usually 0 ⁇ x ⁇ 2.
- SiOx has a larger theoretical capacity than graphite, and amorphous Si or nano-sized Si crystals allow alkaline ions such as lithium ions to easily enter and exit, making it possible to obtain a high capacity.
- 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, for example, at least one of boron, carbon, aluminum and phosphorus.
- the lithium-containing metal composite oxide material used as the negative electrode active material is not particularly limited as long as it can store and release lithium, but a material containing titanium and lithium is preferable from the viewpoint of high current density charge / discharge characteristics. More preferably, a lithium-containing composite metal oxide material containing titanium is preferable, and a composite oxide of lithium and titanium (hereinafter, abbreviated as "lithium titanium composite oxide”) is preferable. That is, it is particularly preferable to use a lithium-titanium composite oxide having a spinel structure contained in the negative electrode active material for a 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 [In the formula, 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 preferably a compound represented by.
- 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). It is 4.
- structure of Z ⁇ 0, for example, Li 4/3 Ti 4/3 Al 1/3 O 4 is preferable.
- the negative electrode preferably further contains a binder, a thickener, and a conductive auxiliary agent.
- the binder examples include the same binders that can be used for the positive electrode described above.
- 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, 15% by mass. It is more preferably mass% or less, further preferably 10 mass% or less, and particularly preferably 8 mass% or less. If the ratio of the binder to the negative electrode active material exceeds the above range, the ratio of the binder whose amount does not contribute to the battery capacity increases, which may lead to a decrease in the battery capacity. Further, if it falls below the above range, the strength of the negative electrode may decrease.
- 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, and usually 5% by mass or less, preferably 3% by mass or less, and further 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 further 3% by mass or more. It is preferable, and usually it is 15% by mass or less, preferably 10% by mass or less, and further preferably 8% by mass or less.
- the ratio to the negative electrode active material is usually 0.1% by mass or more, preferably 0.5% by mass or more, and is 0. .6% by mass or more is more preferable, and usually 5% by mass or less, 3% by mass or less is preferable, and 2% by mass or less is further preferable.
- the thickener examples include the same thickeners that can be used for the positive electrode described above.
- 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, further preferably 0.6% by mass or more, and usually 5% by mass or less. It is preferably 3% by mass or less, and more preferably 2% by mass or less. If the ratio of the thickener to the negative electrode active material is less than the above range, the coatability may be significantly lowered. On the other hand, if it exceeds the above range, the ratio of the negative electrode active material to the negative electrode active material layer decreases, which may cause a problem that the capacity of the battery decreases and an increase in resistance between the negative electrode active materials.
- the conductive auxiliary agent is not particularly limited as long as it can improve the conductivity of the electrolyte, and examples thereof include the same thickeners that can be used for the positive electrode described above.
- Examples of the current collector include metal foils such as iron, stainless steel, copper, aluminum, nickel, and titanium, or metal nets. Among them, aluminum foil or the like is preferable as the positive electrode current collector, and copper foil or the like is preferable as the negative electrode current collector.
- the method for producing the secondary solid-state battery of the present disclosure is not particularly limited, and the secondary solid-state battery can be produced by a conventionally known method.
- a method for producing an electrode for example, the electrode active material is dispersed and mixed in a solution or dispersion in which a binder is dissolved or dispersed in a dispersion medium to prepare an electrode mixture.
- the obtained electrode mixture is uniformly applied to a current collector such as a metal foil or a metal net, dried, and pressed as necessary to form a thin electrode mixture layer on the current collector to form a thin-film electrode. ..
- the binder and the electrode active material may be mixed first, and then the above-mentioned dispersion medium may be added to prepare a mixture.
- the binder and the electrode active material are heated and melted and extruded with an extruder to prepare a thin film mixture, which is then bonded onto a current collector coated with a conductive adhesive or a general-purpose organic solvent to form an electrode. Sheets can also be made. Further, a solution or dispersion of the binder may be applied to the electrode active material preformed in advance.
- Example 1 As the polymer 1, a copolymer of tetrafluoroethylene and N-vinyl-2-pyrrolidone (composition ratio 48:52 (molar ratio)) was used. A polymer electrolyte solution was prepared by dissolving 20% by mass of LiTFSI as an alkali metal salt and 60% by mass of BMI-TFSI as an ionic liquid in dimethylformamide (DMF) with respect to the polymer 1 and the polymer 1. The polymer electrolyte solution was cast on a copper foil using an applicator, and after drying, the thickness was adjusted to about 60 ⁇ m. The cast polymer electrolyte solution was dried under reduced pressure at 100 ° C. for 24 hours to prepare a complex film 1.
- LiTFSI LiTFSI as an alkali metal salt
- BMI-TFSI dimethylformamide
- Example 2 As the polymer 2, a copolymer of tetrafluoroethylene and N-vinyl-2-pyrrolidone (composition ratio 36:64 (molar ratio)) was used. A polymer electrolyte solution was prepared by dissolving 20% by mass of LiTFSI as an alkali metal salt and 60% by mass of BMI-TFSI as an ionic liquid in dimethylformamide (DMF) with respect to the polymer 2 and the polymer 2, and the same as in Example 1. A composite film 2 was prepared in the above.
- LiTFSI LiTFSI as an alkali metal salt
- BMI-TFSI dimethylformamide
- Example 3 As the polymer 3, a copolymer of tetrafluoroethylene and triethylene glycol monovinyl ether (composition ratio 51:49 (molar ratio)) was used.
- a polymer electrolyte solution was prepared by dissolving 20% by mass of LiTFSI as an alkali metal salt, 60% by mass of BMI-TFSI as an ionic liquid, and 1% by mass of benzophenone in polymer 3 and 1% by mass of dimethylformamide (DMF). ..
- the polymer electrolyte solution was cast on a copper foil using an applicator, and after drying, the thickness was adjusted to about 60 ⁇ m.
- the cast polymer electrolyte solution was dried under reduced pressure at 100 ° C. for 24 hours and irradiated with UV for 7 minutes and 30 seconds to prepare a complex film 3.
- Example 4 As the polymer 4, a copolymer of tetrafluoroethylene and lithium trifluorovinyloxytetrafluoroethanesulfonate (composition ratio 50:50 (molar ratio)) was used. 20% by mass of LiTFSI as an alkali metal salt and 60% by mass of BMI-TFSI as an ionic liquid were dissolved in dimethylformamide (DMF) with respect to the polymer 4 and the polymer 4, to prepare a composite film 4 in the same manner as in Example 1. bottom.
- DMF dimethylformamide
- Example 5 As the polymer 5, a copolymer of tetrafluoroethylene and lithium trifluorovinyloxytetrafluoropropaneate (composition ratio: 30:70 (molar ratio)) was used. 20% by mass of LiTFSI as an alkali metal salt and 60% by mass of BMI-TFSI as an ionic liquid were dissolved in dimethylformamide (DMF) with respect to the polymer 5 and the polymer 5, to prepare a composite film 5 in the same manner as in Example 1. bottom.
- DMF dimethylformamide
- Comparative Example 1 Polyethylene oxide was used as the polymer 6. 20% by mass of LiTFSI as an alkali metal salt and 60% by mass of BMI-TFSI as an ionic liquid were dissolved in dimethylformamide (DMF) to prepare a composite film 6 in the same manner as in Example 1.
- DMF dimethylformamide
- the complex film prepared as described above was further heated and depressurized at 100 ° C. for 48 hours, and the amount of volatile components was calculated from the mass change before and after drying.
- the oxidation resistance of the complex film was evaluated by the LSV (Linear Sweep Voltammetry) method.
- LSV Linear Sweep Voltammetry
- a solvent containing propylene carbonate as a solvent and 3% by mass of LITFSI was used.
- Two kinds of preparations were made by adding 1% by mass of the above polymers (Examples 1 and 4 and Comparative Example 1) to this solution.
- Each measurement solution prepared in advance is placed in a measurement container, a platinum electrode is placed in the action station, and a cell in which lithium metal is immersed in the counter electrode and the reference electrode is used as an LSV measurement cell, and a sweep speed of 5 mV / s is used from OCV (open circuit voltage). The potential was swept to 8 V (vs. Li + / Li) on the oxidation side for measurement.
- the results are shown in FIG. Examples 1, 3 and 5 have been shown to have high oxidation resistance.
- the positive electrode 2 was produced in the same manner as above except that LiMn 1.5 Ni 0.5 O 4 (LNMO) was used as the positive electrode active material.
- [Preparation of negative electrode] 98 parts by mass of carbonaceous material (graphite), 1 part by mass of aqueous dispersion of sodium carboxymethyl cellulose (concentration of sodium carboxymethyl cellulose 1% by mass) and aqueous dispersion of styrene-butadiene rubber (styrene-) as a thickener and binder. 1 part by mass (concentration of butadiene rubber 50% by mass) was added, and the mixture was mixed with a disperser to form a slurry. The obtained slurry was applied to a copper foil having a thickness of 10 ⁇ m, dried, rolled by a press, and cut out to obtain a negative electrode.
- the positive electrode, the composite film 1 or 3 or 5, and the negative electrode were opposed to each other and rolled with a roll press to improve the adhesion. Then, punching, attaching an electrode tab, sealing, and aging after precharging were performed to prepare a lithium ion secondary battery 1 having a design capacity of 1 Ah.
- a lithium ion secondary battery 2 was produced in the same manner as above except that the positive electrode 2 was used.
- the secondary battery 1 manufactured above was sandwiched between plates and pressurized, and the battery was charged with a constant current-constant voltage up to 4.2 V at 25 ° C. with a current corresponding to 0.1 C.
- the secondary battery 2 manufactured above was sandwiched between plates and pressurized, and the battery was charged with a constant current-constant voltage up to 4.8 V at 25 ° C. with a current corresponding to 0.1 C.
- the complex of the present disclosure can be suitably used as an electrolyte for a polymer-based solid-state battery.
- the obtained polymer-based solid-state battery is excellent in flame retardancy, oxidation resistance, and the like.
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Abstract
Description
特許文献3には、フルオロモノマーとアミド基を有する重合性ビニル化合物との共重合体を必須とする含フッ素共重合体が開示されている。
特許文献4には、含フッ素モノマーに基づく重合単位と-SO3Li基を側鎖に有する重合単位とからなる含フッ素共重合体が開示されている。
特許文献5には、含フッ素オレフィン単位及びビニルアルコール単位を有する重合体が開示されている。
含フッ素共重合体、アルカリ金属塩及びイオン液体を含む複合体であって、
上記含フッ素共重合体は、
一般式(1)で表される構造単位:
-〔CR1R2一CR3R4〕- (1)
(式中R1~R4は、互いに独立に、H、F、Cl、CF3、OR10(R10は炭素数1~8の有機基)である。ただし、R1~R4の少なくとも1つはFである)及び
一般式(2)で表される構造単位:
-〔CR5R6-CR7R8〕- (2)
(式中、R5~R8は、互いに独立に、H、F,炭素数1~3のアルキル基、フッ素原子以外のへテロ原子を含む官能基、又は、前記官能基を含む基である。ただし、R5~R8の少なくとも1つは、フッ素原子以外のへテロ原子を含む官能基又は前記官能基を含む基である。)を必須とする含フッ素共重合体であり、
揮発成分が複合体全体に対して0.1質量%以下であることを特徴とする複合体である。
一般式(2)で表される構造単位は、ビニルピロリドン、ビニルアルコール、一般式(3)で表される単量体、及び、一般式(4)で表される単量体、及び、一般式(5)で表される単量体からなる群より選択される少なくとも1であることが好ましい。
上記含フッ素共重合体は、架橋鎖を有するものであってもよい。
上記アルカリ金属塩は、含フッ素共重合体に対して0.1~90質量%の割合で含まれることが好ましい。
イオン液体は、含フッ素共重合体に対して1.0~500質量%の割合で含まれるものであることが好ましい。
本開示は、上記ポリマー電解質を備えることを特徴とする電気化学デバイスでもある。
本開示は、上記ポリマー電解質を備えることを特徴とするポリマー系固体電池でもある。
上記ポリマー系固形電池は、リチウムイオン二次電池であることが好ましい。
本開示は、上記ポリマー電解質を備えることを特徴とするアクチュエーターでもある。
近年、固体電池の一種としてポリマー系固体電池の開発が行われてきた。上記ポリマー系固体電池は、通常、ポリマー、電解質、添加剤、可塑剤、電解液等からなるポリマー電解質を備えたものであり、漏液の危険性がないことから高い安全性を有するというメリットがある。
本開示の複合体は、一般式(1)で表される構造単位:
-〔CR1R2一CR3R4〕- (1)
(式中R1~R4は、互いに独立に、H、F、Cl、CF3、OR10(R10は炭素数1~8の有機基。但し、フッ素以外のヘテロ原子を含むものを除く)である。ただし、R1~R4の少なくとも1つはFである)及び
一般式(2)で表される構造単位:
-〔CR5R6-CR7R8〕- (2)
(式中、R5~R8は、互いに独立に、H、F、炭素数1~3のアルキル基、フッ素原子以外のへテロ原子を含む官能基、又は、前記官能基を含む基である。ただし、R5~R8の少なくとも1つは、フッ素原子以外のへテロ原子を含む官能基又は前記官能基を含む基である)を必須とする含フッ素共重合体を含有する。
-〔CR5R6-CR7R8〕- (2)
一般式(2)であらわされる構成単位は、ヘテロ原子を有する官能基を有するものである。なお、上記一般式(1)で表される構造単位で表されるものは、一般式(2)で表される構造単位に該当しない。
なお、「2種以下」は、1種又は2種を意味する。
更に、同一種のヘテロ原子を一官能基中に複数有するものであってもよい。さらに、上記「ヘテロ原子」は、フッ素原子以外のものであるが、「ヘテロ原子を有する官能基」は「ヘテロ原子」とフッ素原子の両方を有するものであってもよい。
上記官能基としては、なかでも、水酸基、アミド基、エーテル基及び、エステル基からなる群より選択される少なくとも1種が好ましい。
上記エーテル基含有単量体としては、一般式(3)で表される単量体、一般式(4)で表される単量体及び一般式(5)で表される単量体からなる群より選択される少なくとも1に由来する構造であることが好ましい。
上記一般式(5)で表される構造を生じる単量体としては、トリフルオロビニルオキシ テトラフルオロプロパン酸リチウム(CF2CFOCF2CF2COOLi)等を挙げることができる。
上記フルオロアルキル基としては、炭素数1~12の直鎖又は分岐したフルオロアルキル基が好ましい。
上記他のフルオロモノマーとしては、トリフルオロスチレン、一般式:CH2=CFRf1(式中、Rf1は炭素数1~12の直鎖又は分岐したフルオロアルキル基)で表されるフルオロモノマー、フルオロアルキルビニルエーテル、フルオロアルキルエチレン、トリフルオロプロピレン、ペンタフルオロプロピレン、トリフルオロブテン、テトラフルオロイソブテン、ヘキサフルオロイソブテン、トリフルオロスチレン等が好ましい。
TOSOH社製 HLC-8020を用い、カラムはポリスチレンゲル製MIXカラム(東ソーGMHシリーズ、30cmサイズ)を3本、40℃、NMP(5mmol/L LiBr含有)溶剤、流速0.7mL/分で行うことができる。サンプル濃度は、0.1質量%で打ち込み量は500μLで行うことができる。数平均分子量(ポリスチレン換算)は、好ましくは10000~1200000であり、より好ましくは40000~1100000である。
R2IxBry
(式中、xおよびyはそれぞれ0~2の整数であり、かつ1≦x+y≦2を満たすものであり、R2は炭素数1~16の飽和もしくは不飽和のフルオロ炭化水素基またはクロロフルオロ炭化水素基、または炭素数1~3の炭化水素基であり、酸素原子を含んでいてもよい)で表される化合物があげられる。臭素化合物又はヨウ素化合物を使用することによって、ヨウ素または臭素が重合体に導入され、架橋点として機能する。
本開示の複合体は、アルカリ金属塩を含有するものである。
アルカリ金属塩はMXで表すことができ、Mはアルカリ金属、Xは対の陰イオンとなる物質である。上記アルカリ金属塩は、一種を単独で使用してもよいし、二種以上を混合物の形態で使用してもよい。
上記アルカリ金属塩としては、リチウム塩(すなわち、LiXで表される化合物)であることが特に好ましい。
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;
LiTFSI、LiFSI、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、LiBOB、LiTDI、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。
本開示の複合体は、さらにイオン液体を含む。
上記「イオン液体」とは、有機カチオンとアニオンとを組み合わせたイオンからなる液体である。イオン液体を含むことで、イオン伝導度を高めることができる。また、蒸気圧がほとんどなく、不燃性であることも好ましい特徴である。
なかでも、TFSIが特に好ましい。
その他の添加剤として、導電性の向上のためにTiO2、Al2O3などの金属フィラーを添加しても良い。上記添加剤の含有量は、フッ素フッ素共重合体に対して、0.1~10質量%であることが好ましい。より好ましくは、0.2~5質量%である。
なお、「難燃性である」とは、以下で詳述する実施例における難燃性の評価において、裸火よりの燃え移りがなかったとの評価結果が得られることを意味する。
なお、本開示における揮発成分量は、実施例において後述する方法により求めた値である。
上記複合体の製造方法としては特に限定されず、任意の方法で調製することができる。例えば、上記含フッ素共重合体、アルカリ金属塩、イオン液体、必要に応じて添加剤等を溶媒でスラリー化し、得られたスラリーを薄膜状に塗布して乾燥する工程により得ることができる。
本開示の複合体は、各種電気化学デバイスの電解質として好適に用いることができる。該複合体からなるポリマー電解質を備えた電気化学デバイスも本開示の一つである。
上記電気化学デバイスとしては特に限定されず、従来公知の電気化学デバイスに適用することができる。具体的には、リチウムイオン電池等の二次電池、リチウム電池等の一次電池、ナトリウムイオン電池、マグネシウムイオン電池、ラジカル電池、太陽電池(特に色素増感型太陽電池)、燃料電池;
リチウムイオンキャパシタ、ハイブリッドキャパシタ、電気化学キャパシタ、電気二重層キャパシタ等のキャパシタ;シリンダ、搖動モーター、モーター等のアクチュエーター;
アルミニウム電解コンデンサ、タンタル電解コンデンサ等の各種コンデンサ;
エレクトロミック素子、電気化学スイッチング素子、各種電気化学センサー等を挙げることができる。
本開示は、上述した本開示の複合体をポリマー電解質として備える二次固体電池でもある。
本開示の二次固体電池は、正極又は負極活物質、結着剤、及び、集電体からなる正極及び負極、並びに、当該正極及び当該負極の間に介在する上記複合体からなるポリマー電解質層を備えるポリマー系固体電池である。このような二次固体電池としてはリチウムイオン電池であることが好ましい。
上記正極活物質としては特に限定されず、公知の電気化学デバイスに使用されるものを挙げることができる。リチウムイオン二次電池の正極活物質について具体的に説明すると、電気化学的にリチウムイオンを吸蔵・放出可能なものであれば特に制限されないが、例えば、リチウム含有遷移金属複合酸化物、リチウム含有遷移金属リン酸化合物、硫黄系材料、導電性高分子等が挙げられる。なかでも、正極活物質としては、リチウム含有遷移金属複合酸化物、リチウム含有遷移金属リン酸化合物が好ましく、特に、高電圧を産み出すリチウム含有遷移金属複合酸化物が好ましい。
上記正極活物質が上記硫黄単体の場合、上記正極活物質に含まれる硫黄の含有量は、上記硫黄単体の含有量と等しい。
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、ポリフッ化ビニリデン、ポリテトラフルオロエチレン、ポリエチレン、ポリプロピレン、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、エチレン‐アクリル酸共重合体、エチレン‐メタクリル酸共重合体、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、ポリイミド、芳香族ポリアミド、セルロース、ニトロセルロース、NBR(アクリロニトリル‐ブタジエンゴム)、フッ素ゴム、エチレン‐プロピレンゴム、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・エチレン共重合体、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、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、ポリビニリデンフルオライド、ビニリデンフルオライド・テトラフルオロエチレン共重合体、テトラフルオロエチレン・エチレン共重合体、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。なお、これらの物質は、1種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。
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。上記負極活物質としては特に限定されず、公知の電気化学デバイスに使用されるものを挙げることができる。リチウムイオン二次電池の負極活物質について具体的に説明すると、電気化学的にリチウムイオンを吸蔵・放出可能なものであれば、特に制限はない。具体例としては、炭素質材料、合金系材料、リチウム含有金属複合酸化物材料、導電性高分子等が挙げられる。これらは、1種を単独で用いてもよく、また2種以上を任意に組み合わせて併用してもよい。
金属化合物として、金属酸化物、金属窒化物、金属炭化物等が挙げられる。また、2種以上の金属からなる合金を使用しても良い。
Si金属酸化物は、具体的には、SiOxと表されるものであり、xは0≦x<2であり、より好ましくは、0.2以上、1.8以下、更に好ましくは、0.4以上、1.6以下、特に好ましくは、0.6以上、1,4以下であり、X=0がとりわけ好ましい。この範囲であれば、高容量であると同時に、Liと酸素との結合による不可逆容量を低減させることが可能となる。
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。
本開示の二次固体電池の製造方法としては特に限定されず、従来公知の方法により製造することができる。電極の製造方法としては、例えば、結着剤を分散媒に溶解又は分散させた溶液又は分散液に上記電極活物質を分散、混合させて電極合剤を調製する。得られた電極合剤を、金属箔又は金属網等の集電体に均一に塗布、乾燥、必要に応じてプレスして集電体上へ薄い電極合剤層を形成し薄膜状電極とする。
ポリマー1として、テトラフルオロエチレン及びN-ビニル-2-ピロリドンの共重合体(組成比48:52(モル比))を用いた。ポリマー1及び、ポリマー1に対してアルカリ金属塩としてLiTFSIを20質量%、イオン液体としてBMI-TFSIを60質量%をジメチルホルムアミド(DMF)に溶解してポリマー電解質溶液を調製した。アプリケーターを用いてポリマー電解質溶液を銅箔にキャストし、乾燥後60μm程度の厚みになるように調整した。キャストしたポリマー電解質溶液を、100℃で24時間減圧乾燥することにより、複合体フィルム1を作製した。
ポリマー2として、テトラフルオロエチレン及びN-ビニル-2-ピロリドンの共重合体(組成比36:64(モル比))を用いた。ポリマー2及び、ポリマー2に対してアルカリ金属塩としてLiTFSIを20質量%、イオン液体としてBMI-TFSIを60質量%をジメチルホルムアミド(DMF)に溶解してポリマー電解質溶液を調製し、実施例1同様に複合体フィルム2を作製した。
ポリマー3として、テトラフルオロエチレン及びトリエチレングリコールモノビニルエーテルの共重合体(組成比51:49(モル比))を用いた。ポリマー3及び、ポリマー3に対してアルカリ金属塩としてLiTFSIを20質量%、イオン液体としてBMI-TFSIを60質量%、ベンゾフェノンを1質量%ジメチルホルムアミド(DMF)に溶解してポリマー電解質溶液を調製した。アプリケーターを用いてポリマー電解質溶液を銅箔にキャストし、乾燥後60μm程度の厚みになるように調整した。キャストしたポリマー電解質溶液を、100℃で24時間減圧乾燥し、7分30秒間UVを照射することにより、複合体フィルム3を作製した。
ポリマー4として、テトラフルオロエチレン及びトリフルオロビニルオキシテトラフルオロエタンスルホン酸リチウムの共重合体(組成比50:50(モル比))を用いた。ポリマー4及び、ポリマー4に対してアルカリ金属塩としてLiTFSIを20質量%、イオン液体としてBMI-TFSIを60質量%をジメチルホルムアミド(DMF)に溶解し、実施例1同様に複合体フィルム4を作製した。
ポリマー5として、テトラフルオロエチレン及びトリフルオロビニルオキシテトラフルオロプロパン酸リチウムの共重合体(組成比30:70(モル比))を用いた。ポリマー5及び、ポリマー5に対してアルカリ金属塩としてLiTFSIを20質量%、イオン液体としてBMI-TFSIを60質量%をジメチルホルムアミド(DMF)に溶解し、実施例1同様に複合体フィルム5を作製した。
ポリマー6として、ポリエチレンオキシドを用いた。アルカリ金属塩としてLiTFSIを20質量%、イオン液体としてBMI-TFSIを60質量%をジメチルホルムアミド(DMF)に溶解し、実施例1同様に複合体フィルム6を作製した。
上述のように作製した複合体フィルムを、さらに100℃で48時間加熱減圧し、乾燥前後の質量変化から揮発成分量を算出した。
作製した複合体フィルムをライターの裸火に3秒さらし、目視により炎の燃え移りやすさと燃焼性を観察した。
燃え移りがなかった場合、難燃性であると判断した。
本測定用サンプルとして、実施例1~5、比較例1と同様の複合体を用いた。複合体フィルムをΦ13mmのサイズに打ち抜き、ステンレススチールを作用電極および相対電極にして、2極式セルを作成した。作成した電池は60℃に設定した恒温槽内で複素交流インピーダンス測定装置に動線を用いて接続し、電解質と電極を十分になじませるため3時間放置した後、測定し、下記式からイオン伝導度を算出した。
σ=C/R (C=l/S)
ここでlは試料の厚さ、Sはその面積、Rは抵抗をあらわす。
表2の結果から、実施例1~5の複合体フィルムは、ポリマー系固体電池の電解質として充分なイオン電導度を示すことが分かった。
LSV(Linear Sweep Voltammetry)法により複合体フィルムの耐酸化性を評価した。LSV測定はプロピレンカーボネートを溶媒として、3質量%のLITFSIをいれた溶媒を用いた。この溶液に上記ポリマー(実施例1,4、比較例1)を1質量%加えたものの2種の調整を行った。測定容器に予め調整した各測定溶液をいれ、作用局に白金電極を、対極及び参照極にリチウム金属を浸したものをLSV測定用セルとし、OCV(open circuit voltage)から掃引速度5mV/sで酸化側に8V(vs. Li+/Li)まで電位を掃引させ測定した。結果を図1に示す。実施例1、3、5は、高い耐酸化性を有することが示された。
[正極の作製]
正極活物質としてのLiNi0.5Co0.2Mn0.3O2(NMC)95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)2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、切り出して正極1とした。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2を作製した。
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、切り出して負極とした。
上記の正極、複合体フィルム1または3または5、負極を対向させ、ロールプレス機で圧延を行い、密着性を高めた。
その後、打ち抜き、電極タブを取り付け、封止し予備充電後にエージングを行い、設計容量が1Ahのリチウムイオン二次電池1を作製した。正極2を用いる以外は上記と同様にして、リチウムイオン二次電池2を作製した
上記で製造した二次電池1を、板で挟み加圧した状態で、25℃において、0.1Cに相当する電流で電池は4.2Vまで定電流-定電圧充電した。上記で製造した二次電池2を、板で挟み加圧した状態で、25℃において、0.1Cに相当する電流で電池は4.8Vまで定電流-定電圧充電した。
作製したリチウムイオン二次電池1および2を25℃雰囲気中の水平台に固定し、電池の中央部に向けて電池上方から、直径3mmφのセラミック釘を80mm/sの釘刺し速度で釘刺し試験をおこない、様子の観察と温度測定を行った。
複合体フィルム1、3、5を用いて作製した電池はいずれも発煙、破裂および発火の様子は観察されず、電池表面の温度変化は5℃以内であった。
以上より、安全性の高い電池となっていることを確認した。
Claims (15)
- 含フッ素共重合体、アルカリ金属塩及びイオン液体を含む複合体であって、
前記含フッ素共重合体は、
一般式(1)で表される構造単位:
-〔CR1R2一CR3R4〕- (1)
(式中R1~R4は、互いに独立に、H、F、Cl、CF3、OR10(R10は炭素数1~8の有機基)である。ただし、R1~R4の少なくとも1つはFである)及び
一般式(2)で表される構造単位:
-〔CR5R6-CR7R8〕- (2)
(式中、R5~R8は、互いに独立に、H、F,炭素数1~3のアルキル基、フッ素原子以外のへテロ原子を含む官能基、又は、前記官能基を含む基である。ただし、R5~R8の少なくとも1つは、フッ素原子以外のへテロ原子を含む官能基又は前記官能基を含む基である。)を必須とする含フッ素共重合体であり、
揮発成分が複合体全体に対して0.1質量%以下であることを特徴とする複合体。 - 上記一般式(1)で表される構造単位は、テトラフルオロエチレン単位である請求項1記載の複合体。
- 一般式(2)で表される構造単位は、ビニルピロリドン、ビニルアルコール、一般式(3)で表される単量体、及び、一般式(4)で表される単量体、及び、一般式(5)で表される単量体からなる群より選択される少なくとも1である
請求項1又は2記載の複合体。
一般式(3)中、XはHまたはFを表し、nは1~8の整数を表す。R20は、Hまたは炭素数1~10のアルキル基を表す。
一般式(4)中、XはHまたはFを表し、Y1は、F、Cl又はCF3を表し、Y2はF又はClを表し、k及びmは0~2の整数を表す。Mは、アルカリ金属を表す。
一般式(5)中、XはHまたはFを表し、Y1は、F、Cl又はCF3を表し、Y2はF又はClを表し、k及びmは0~2の整数を表す。Mは、アルカリ金属を表す。 - 含フッ素共重合体は、一般式(1)で表される構造単位の含有量が1~60モル%、上記一般式(2)で表される構成単位の含有量が40~99モル%の組成範囲である請求項1~3のいずれかに記載の複合体。
- 含フッ素共重合体は、架橋鎖を有する請求項1~4のいずれかに記載の複合体。
- アルカリ金属塩は、LiPF6、LiBF4、LiTFSI、LiFSI、LiPO2F2、及び、LiBOBからなる群より選択される少なくとも一種のリチウム塩である請求項1~5のいずれかに記載の複合体。
- アルカリ金属塩は、含フッ素共重合体に対して0.1~90質量%の割合で含まれるものである請求項1~6のいずれかに記載の複合体。
- イオン液体は、有機カチオンとして1-ブチル-3-メチルイミダゾリウム(BMI)カチオン、又は、N-メチル-N-ブチル-ピロリジウム(Pyr14)カチオン、アニオンとしてBF4アニオン、又は、ビス(トリフルオロメタンスルホニル)イミド(TFSI)アニオンを組み合わせたものから選択される少なくとも一種である請求項1~7のいずれかに記載の複合体。
- イオン液体は、含フッ素共重合体に対して1.0~500質量%の割合で含まれるものである請求項1~8のいずれかに記載の複合体。
- 難燃性である請求項1~9のいずれかに記載の複合体。
- 請求項1~10のいずれか1項に記載の複合体からなることを特徴とするポリマー電解質。
- 請求項11記載のポリマー電解質を備えることを特徴とする電気化学デバイス。
- 請求項11記載のポリマー電解質を備えることを特徴とするポリマー系固体電池。
- リチウムイオン二次電池である請求項13記載のポリマー系固体電池。
- 請求項11記載のポリマー電解質を備えることを特徴とするアクチュエーター。
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