WO2023123030A1 - Dispositif électrochimique et dispositif électronique - Google Patents

Dispositif électrochimique et dispositif électronique Download PDF

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Publication number
WO2023123030A1
WO2023123030A1 PCT/CN2021/142400 CN2021142400W WO2023123030A1 WO 2023123030 A1 WO2023123030 A1 WO 2023123030A1 CN 2021142400 W CN2021142400 W CN 2021142400W WO 2023123030 A1 WO2023123030 A1 WO 2023123030A1
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Prior art keywords
positive electrode
compound
electrochemical device
lithium
electrolyte
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PCT/CN2021/142400
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English (en)
Chinese (zh)
Inventor
张青文
王可飞
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宁德新能源科技有限公司
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Priority to PCT/CN2021/142400 priority Critical patent/WO2023123030A1/fr
Priority to CN202180027070.4A priority patent/CN115380408A/zh
Publication of WO2023123030A1 publication Critical patent/WO2023123030A1/fr

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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
    • H01M10/052—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
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
    • H01M4/602—Polymers
    • H01M4/606—Polymers containing aromatic main chain polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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

Definitions

  • the present application relates to the field of energy storage, in particular to an electrochemical device and an electronic device, especially a lithium ion battery.
  • the embodiments of the present application solve the problems existing in the prior art to some extent by providing an electrochemical device and an electronic device with improved float charging performance and safety.
  • the present application provides an electrochemical device, which includes: a positive electrode, a negative electrode and an electrolyte, the positive electrode includes a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector, wherein:
  • the positive electrode active material layer includes poly(amic acid), and the electrolytic solution includes a difluorophosphite compound.
  • the content of the poly(amic acid) is a%; based on the weight of the electrolyte, the content of the difluorophosphite compound is b %; and a and b satisfy: 0.1 ⁇ a/b ⁇ 5.
  • a ranges from 0.5 to 5.
  • the value of b ranges from 0.1 to 5.
  • the poly(amic acid) includes a compound of formula I:
  • R is selected from C1-12 alkenyl or C6-12 aromatic ring
  • A is selected from single bond, C1-12 alkenyl or C6-12 aromatic ring;
  • n is an integer of 5-20.
  • the difluorophosphite compound includes a compound of formula II:
  • A is substituted or unsubstituted C1-10 alkyl or C3-10 cycloalkyl
  • the substituent When substituted, the substituent is halogen or cyano.
  • the difluorophosphite compound includes at least one of the following compounds:
  • the electrolyte solution further includes a compound containing a sulfur-oxygen double bond
  • the compound containing a sulfur-oxygen double bond includes at least one of the following compounds: cyclic sulfate, chain sulfate, chain Shaped sulfonate, cyclic sulfonate, chain sulfite or cyclic sulfite or compound of formula III:
  • L is selected from a single bond or methylene
  • n is an integer from 1 to 4.
  • n is an integer from 0 to 2;
  • p is an integer of 0 to 6.
  • the compound of formula III is selected from at least one of the following:
  • the content of the difluorophosphite compound is b%
  • the content of the compound containing sulfur and oxygen double bonds is c%
  • b and c satisfy: 1 ⁇ b+c ⁇ 8 and 0.4 ⁇ b/c ⁇ 5.
  • the content of the sulfur-oxygen double bond-containing compound is c%, and the value of c ranges from 0.1 to 8.
  • the value range of c is 0.1 to 1.5
  • the present application provides an electronic device comprising the electrochemical device according to the present application.
  • the specific combination of the positive electrode active material comprising poly(amic acid) and the electrolyte solution comprising difluorophosphite compound used in the present application can improve the interfacial stability of the positive electrode active material layer under thermal runaway, and can sufficiently inhibit electrochemical
  • the floating charge thickness of the device increases under high pressure and high temperature, which can effectively prevent safety problems such as combustion or explosion caused by thermal runaway of the battery.
  • a list of items linked by the term "at least one of” may mean any combination of the listed items.
  • the phrase "at least one of A and B” means only A; only B; or A and B.
  • the phrase "at least one of A, B, and C” means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C.
  • Item A may contain a single element or multiple elements.
  • Item B may contain a single element or multiple elements.
  • Item C may contain a single element or multiple elements.
  • the term "at least one of" has the same meaning as the term "at least one of”.
  • alkyl is intended to be a straight chain saturated hydrocarbon structure having from 1 to 20 carbon atoms. "Alkyl” is also contemplated as branched or cyclic hydrocarbon structures having from 3 to 20 carbon atoms. When an alkyl group having a specific number of carbons is specified, all geometric isomers having that number of carbons are intended to be encompassed; thus, for example, “butyl” is meant to include n-butyl, sec-butyl, iso-butyl, tert-butyl and cyclobutyl; “propyl” includes n-propyl, isopropyl and cyclopropyl.
  • alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, cyclobutyl, n-pentyl, Isopentyl, neopentyl, cyclopentyl, methylcyclopentyl, ethylcyclopentyl, n-hexyl, isohexyl, cyclohexyl, n-heptyl, octyl, cyclopropyl, cyclobutyl, norbornyl Base etc.
  • alkenyl refers to a monovalent unsaturated hydrocarbon group which may be straight-chain or branched and which has at least one and usually 1, 2 or 3 carbon-carbon double bonds. Unless otherwise defined, such alkenyl groups typically contain 2 to 20 carbon atoms and include, for example, -C 2-4 alkenyl, -C 2-6 alkenyl, and -C 2-10 alkenyl. Representative alkenyl groups include, for example, ethenyl, n-propenyl, isopropenyl, n-but-2-enyl, but-3-enyl, n-hex-3-enyl, and the like.
  • aromatic ring means a monovalent aromatic hydrocarbon having a single ring (eg, phenyl) or fused rings.
  • Fused ring systems include those that are fully unsaturated (eg, naphthalene) as well as those that are partially unsaturated (eg, 1,2,3,4-tetrahydronaphthalene).
  • the aryl ring typically contains 6 to 26 carbon ring atoms and includes, for example, -C 6-10 aryl.
  • aryl groups include, for example, phenyl, methylphenyl, propylphenyl, isopropylphenyl, benzyl, and naphthalen-1-yl, naphthalen-2-yl, and the like.
  • cycloalkyl encompasses cyclic alkyl groups.
  • the cycloalkyl group may be a cycloalkyl group of 3-20 carbon atoms, a cycloalkyl group of 6-20 carbon atoms, a cycloalkyl group of 3-12 carbon atoms, or a cycloalkyl group of 3-6 carbon atoms.
  • cycloalkyl may be cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and the like.
  • cycloalkyl groups may be optionally substituted.
  • halogen refers to the elements of group VIIA of the periodic table of chemical elements, including fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At).
  • the ways to improve the safety of electrochemical devices mainly include: adding flame retardant additives in the electrolyte; and using thermal closed-cell separators or functional coatings diaphragm.
  • adding flame retardant additives in the electrolyte will have a serious adverse effect on the electrochemical performance of lithium-ion batteries.
  • thermally closed-cell separators or functional coating separators can improve the safety of lithium-ion batteries and have little impact on the electrochemical performance of batteries during normal operation, they still cannot fundamentally control the thermal runaway rate of batteries.
  • the present application solves the above-mentioned problems by using a combination of a positive electrode active material including poly(amic acid) and an electrolyte solution including a difluorophosphite compound.
  • Poly(amic acid) can be converted into polyimide at temperatures above 160°C.
  • the poly(amic acid) in the positive electrode active material layer can quickly absorb heat, undergo a polymerization reaction, and generate polyimide with insulating function, thereby blocking the ions and particles of the positive electrode active material.
  • Electron transport, fast and efficient enhancement of lithium-ion battery safety can affect the float charge performance of Li-ion batteries.
  • difluorophosphite compounds in the electrolyte helps to improve the float performance of lithium-ion batteries, because there are a large number of intermolecular forces between poly(amic acid) and difluorophosphite compounds, thereby relieving the The effect of poly(amic acid) on the ion conductance in the transport of lithium ions at room temperature was studied.
  • poly(amic acid) and difluorophosphite compounds can form composite polymers, which are more effective for improving the float performance and safety of lithium-ion batteries. Therefore, the specific combination of the positive electrode active material and the electrolyte solution of the present application can significantly improve the float charge performance and safety of the electrochemical device.
  • the positive electrode includes a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector.
  • the positive active material layer may be one or more layers.
  • the positive active material layer includes positive active materials, and each layer of the multilayer positive active materials may contain the same or different positive active materials.
  • a main feature of the electrochemical device of the present application is that the positive electrode active material layer includes poly(amic acid).
  • the poly(amic acid) comprises a compound of formula I:
  • R is selected from C1-12 alkenyl or C6-12 aromatic ring
  • A is selected from single bond, C1-12 alkenyl or C6-12 aromatic ring;
  • n is an integer of 5-20.
  • the poly(amic acid) comprises a compound of formula I-1 (BPDA/PDA PAA):
  • n is an integer from 5 to 20.
  • the content of the poly(amic acid) is a%, and the value of a ranges from 0.5 to 5. In some embodiments, a ranges from 1 to 3. In some embodiments, x is 0.5, 1, 2, 2.5, 3, 3.5, 4, 4.5, 5 or within a range consisting of any two of the above values. When the content of the poly(amic acid) in the positive electrode active material layer is within the above range, it is helpful to further improve the float charge performance and safety of the electrochemical device.
  • the type of positive electrode active material is not particularly limited, as long as it can store and release metal ions (for example, lithium ions) electrochemically.
  • the positive active material is a material containing lithium and at least one transition metal.
  • positive active materials may include, but are not limited to, lithium transition metal composite oxides and lithium transition metal phosphate compounds.
  • the transition metals in the lithium transition metal composite oxide include V, Ti, Cr, Mn, Fe, Co, Ni, Cu, and the like.
  • lithium transition metal composite oxides include lithium cobalt composite oxides such as LiCoO 2 , lithium nickel composite oxides such as LiNiO 2 , lithium manganese composite oxides such as LiMnO 2 , LiMn 2 O 4 , Li 2 MnO 4 , lithium nickel manganese cobalt composite oxides such as LiNi 1/3 Mn 1/3 Co 1/3 O 2 , LiNi 0.5 Mn 0.3 Co 0.2 O 2 , etc., in which a part of the transition metal atom which is the main body of these lithium transition metal composite oxides is Na, K, B, F, Al, Ti, V, Cr, Mn, Fe, Co, Li, Ni, Cu, Zn, Mg, Ga, Zr, Si, Nb, Mo, Sn, W and other elements substituted .
  • lithium transition metal composite oxides may include, but are not limited to, 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 0.33 O 2 , LiNi 0.45 Co 0.10 Al 0.45 O 2 , LiMn 1.8 Al 0.2 O 4 and LiMn 1.5 Ni 0.5 O 4 etc.
  • combinations of lithium transition metal composite oxides include, but are not limited to, combinations of LiCoO 2 and LiMn 2 O 4 , wherein a part of Mn in LiMn 2 O 4 may be replaced by transition metals (for example, LiNi 0.33 Co 0.33 Mn 0.33 O 2 ), part of Co in LiCoO 2 can be replaced by transition metals.
  • the transition metals in the lithium-containing transition metal phosphate compound include V, Ti, Cr, Mn, Fe, Co, Ni, Cu, and the like.
  • lithium-containing transition metal phosphate compounds include iron phosphates such as LiFePO 4 , Li 3 Fe 2 (PO 4 ) 3 , LiFeP 2 O 7 , and cobalt phosphates such as LiCoPO 4 , wherein as these lithium transition metal phosphate compounds Some of the transition metal atoms of the main body are replaced by other elements such as Al, Ti, V, Cr, Mn, Fe, Co, Li, Ni, Cu, Zn, Mg, Ga, Zr, Nb, Si, etc.
  • a substance different from its composition may be attached to the surface of the positive electrode active material.
  • surface attachment substances may include, but are not limited to: oxides such as alumina, silica, titania, zirconia, magnesia, calcium oxide, boron oxide, antimony oxide, bismuth oxide; lithium sulfate, sodium sulfate, potassium sulfate , magnesium sulfate, calcium sulfate, aluminum sulfate and other sulfates; lithium carbonate, calcium carbonate, magnesium carbonate and other carbonates; carbon, etc.
  • a positive electrode active material having a composition different from the positive electrode active material attached to the surface of the positive electrode active material is also referred to as a "positive electrode active material".
  • the shape of the positive electrode active material particles includes, but is not limited to, block shape, polyhedron shape, spherical shape, ellipsoidal shape, plate shape, needle shape and columnar shape.
  • the positive active material particles include primary particles, secondary particles, or a combination thereof. In some embodiments, primary particles may agglomerate to form secondary particles.
  • positive electrode conductive material is not limited, and any known conductive material can be used.
  • positive electrode conductive materials may include, but are not limited to, graphite such as natural graphite and artificial graphite; carbon black such as acetylene black; carbon materials such as amorphous carbon such as needle coke; carbon nanotubes; graphene and the like.
  • the above positive electrode conductive materials can be used alone or in any combination.
  • positive electrode binder used in the production of the positive electrode active material layer is not particularly limited, and in the case of the coating method, any material can be dissolved or dispersed in the liquid medium used in electrode production.
  • positive electrode binders may include, but are not limited to, one or more of the following: polyethylene, polypropylene, polyethylene terephthalate, polymethyl methacrylate, polyimide, Aramid, cellulose, nitrocellulose and other resin-based polymers; styrene-butadiene rubber (SBR), nitrile rubber (NBR), fluororubber, isoprene rubber, polybutadiene rubber, ethylene-propylene rubber and other rubber Shaped polymer; styrene-butadiene-styrene block copolymer or its hydrogenated product, ethylene-propylene-diene terpolymer (EPDM), styrene-ethylene-butadiene-ethylene copolymer, benzene Thermoplastic
  • the kind of solvent used to form the positive electrode slurry is not limited as long as it is a solvent capable of dissolving or dispersing the positive electrode active material, conductive material, positive electrode binder, and thickener used as needed.
  • the solvent used to form the positive electrode slurry may include any one of aqueous solvents and organic solvents.
  • the aqueous medium may include, but are not limited to, water, a mixed medium of alcohol and water, and the like.
  • organic media may include, but are not limited to, aliphatic hydrocarbons such as hexane; aromatic hydrocarbons such as benzene, toluene, xylene, and methylnaphthalene; heterocyclic compounds such as quinoline and pyridine; acetone, methyl ethyl ketones such as ketone and cyclohexanone; esters such as methyl acetate and methyl acrylate; amines such as diethylenetriamine and N,N-dimethylaminopropylamine; diethyl ether, propylene oxide, tetrahydrofuran (THF ) and other ethers; amides such as N-methylpyrrolidone (NMP), dimethylformamide, and dimethylacetamide; aprotic polar solvents such as hexamethylphosphoramide and dimethyl sulfoxide, etc.
  • aliphatic hydrocarbons such as hexane
  • aromatic hydrocarbons such as benz
  • Thickeners are generally used to adjust the viscosity of the slurry.
  • thickeners and styrene-butadiene rubber (SBR) emulsions can be used for slurrying.
  • SBR styrene-butadiene rubber
  • the kind of thickener is not particularly limited, and examples thereof may include, but are not limited to, carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, ethylcellulose, polyvinyl alcohol, oxidized starch, phosphorylated starch , casein and their salts, etc.
  • the above-mentioned thickeners can be used alone or in any combination.
  • the type of the positive electrode collector is not particularly limited, and it can be any known material suitable for use as the positive electrode collector.
  • the positive current collector may include, but are not limited to, metal materials such as aluminum, stainless steel, nickel plating, titanium, and tantalum; carbon materials such as carbon cloth and carbon paper.
  • the positive current collector is a metal material.
  • the positive current collector is aluminum.
  • the surface of the positive electrode current collector may include a conductive aid.
  • conductive aids may include, but are not limited to, carbon and noble metals such as gold, platinum, and silver.
  • the positive electrode can be produced by forming a positive electrode active material layer containing a positive electrode active material and a binder on a current collector.
  • the manufacture of the positive electrode using the positive electrode active material can be carried out by a conventional method, that is, the positive electrode active material and the binder, as well as the conductive material and thickener as required, etc. are dry mixed, made into a sheet, and the obtained The sheet is pressed onto the positive current collector; or these materials are dissolved or dispersed in a liquid medium to make a slurry, and the slurry is coated on the positive current collector and dried to form a positive electrode current collector.
  • a positive electrode active material layer whereby a positive electrode can be obtained.
  • the electrolytic solution used in the electrochemical device of the present application includes an electrolyte and a solvent for dissolving the electrolyte.
  • the electrolyte solution includes a difluorophosphite compound.
  • the difluorophosphite compound includes a compound of formula II:
  • A is substituted or unsubstituted C1-10 alkyl or C3-10 cycloalkyl
  • the substituent When substituted, the substituent is halogen or cyano.
  • the difluorophosphite compound includes ether linkages.
  • the difluorophosphite compound containing ether bonds can be better combined with poly(amic acid), so that when thermal runaway occurs, it can respond quickly and undergo polymerization reaction, further improving the float charge performance and safety of the electrochemical device.
  • the difluorophosphite compound includes at least one of the following compounds:
  • the content of the difluorophosphite compound is b%, and the value of b ranges from 0.1 to 5. In some embodiments, b ranges from 0.5 to 5. In some embodiments, x is 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 or within a range consisting of any two values above. When the content of the difluorophosphite compound in the electrolyte is within the above range, it is helpful to further improve the float charge performance and safety of the electrochemical device.
  • a and b satisfy: 0.1 ⁇ a/b ⁇ 5. In some embodiments, a and b satisfy: 0.2 ⁇ a/b ⁇ 2.5. In some embodiments, a and b satisfy: 0.5 ⁇ a/b ⁇ 2. In some embodiments, a and b satisfy: 1 ⁇ a/b ⁇ 1.5. In some embodiments, a/b is 0.1, 0.2, 0.5, 1, 2, 2.5, 3, 3.5, 4, 4.5, 5 or within a range consisting of any two values above.
  • the electrolyte solution further includes a compound containing a sulfur-oxygen double bond
  • the compound containing a sulfur-oxygen double bond includes at least one of the following compounds: cyclic sulfate, chain sulfate, chain Sulfonate, cyclic sulfonate, chain sulfite or cyclic sulfite or compound of formula III:
  • L is selected from a single bond or methylene
  • n is an integer from 1 to 4.
  • n is an integer from 0 to 2;
  • p is an integer of 0 to 6.
  • the compound of formula III is selected from at least one of the following:
  • the structural stability of the positive electrode active material under thermal runaway conditions can be further improved, and at the same time, it can accelerate the formation of poly(amic acid) and difluoride at high temperature.
  • the thermal polymerization reaction between the phosphite compounds can rapidly reduce the ion conductance and electron conductance, and further improve the float charge performance and safety of the electrochemical device.
  • the content of the difluorophosphite compound is b%, the content of the compound containing sulfur and oxygen double bonds is c%, and b and c satisfy: 1 ⁇ b+c ⁇ 8 and 0.4 ⁇ b/c ⁇ 5.
  • b+c is 1, 2, 3, 4, 5, 6, 7, 8 or within a range consisting of any two values above.
  • b/c is 0.4, 0.5, 1, 2, 3, 4, 5 or within a range consisting of any two values above.
  • the content of the sulfur-oxygen double bond-containing compound is c%, and the value of c ranges from 0.1 to 8. In some embodiments, c ranges from 0.1 to 5. In some embodiments, the value of c ranges from 0.1 to 3. In some embodiments, c ranges from 0.1 to 1.5. In some embodiments, c is 0.1, 0.3, 0.5, 1, 2, 2.5, 3, 3.5, 4, 4.5, 5, 8 or within a range consisting of any two of the above values.
  • the electrolyte solution further comprises any non-aqueous solvent known in the prior art as a solvent for the electrolyte solution.
  • the non-aqueous solvent includes, but is not limited to, one or more of the following: cyclic carbonate, chain carbonate, cyclic carboxylate, chain carboxylate, cyclic Ethers, chain ethers, phosphorus-containing organic solvents, sulfur-containing organic solvents, and aromatic fluorinated solvents.
  • examples of the cyclic carbonate may include, but are not limited to, one or more of the following: ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate.
  • the cyclic carbonate has 3-6 carbon atoms.
  • examples of the chain carbonate may include, but are not limited to, one or more of the following: dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate (DEC), methyl carbonate Chain carbonates such as ethyl n-propyl carbonate, ethyl n-propyl carbonate, di-n-propyl carbonate, etc.
  • chain carbonates substituted with fluorine may include, but are not limited to, one or more of the following: bis(fluoromethyl)carbonate, bis(difluoromethyl)carbonate, bis(trifluoromethyl)carbonate base) carbonate, bis(2-fluoroethyl)carbonate, bis(2,2-difluoroethyl)carbonate, bis(2,2,2-trifluoroethyl)carbonate, 2-fluoroethyl methyl carbonate, 2,2-difluoroethyl methyl carbonate and 2,2,2-trifluoroethyl methyl carbonate, etc.
  • examples of the cyclic carboxylate may include, but are not limited to, one or more of the following: one or more of ⁇ -butyrolactone and ⁇ -valerolactone.
  • some of the hydrogen atoms of the cyclic carboxylate may be replaced by fluorine.
  • examples of the chain carboxylate may include, but are not limited to, one or more of the following: methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate ester, sec-butyl acetate, isobutyl acetate, tert-butyl acetate, methyl propionate, ethyl propionate, propyl propionate, isopropyl propionate, methyl butyrate, ethyl butyrate, butyric acid Propyl ester, methyl isobutyrate, ethyl isobutyrate, methyl valerate, ethyl valerate, methyl pivalate and ethyl pivalate, etc.
  • part of the hydrogen atoms of the chain carboxylate may be substituted by fluorine.
  • examples of fluorine-substituted chain carboxylic acid esters may include, but are not limited to, methyl trifluoroacetate, ethyl trifluoroacetate, propyl trifluoroacetate, butyl trifluoroacetate, and trifluoroacetic acid 2,2,2-trifluoroethyl ester, etc.
  • examples of the cyclic ether may include, but are not limited to, one or more of the following: tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxolane, 2-methyl 1,3-dioxolane, 4-methyl 1,3-dioxolane, 1,3-dioxane, 1,4-dioxane and dimethoxypropane.
  • examples of the chain ethers may include, but are not limited to, one or more of the following: dimethoxymethane, 1,1-dimethoxyethane, 1,2- Dimethoxyethane, diethoxymethane, 1,1-diethoxyethane, 1,2-diethoxyethane, ethoxymethoxymethane, 1,1-ethoxy Methoxyethane and 1,2-ethoxymethoxyethane, etc.
  • examples of the phosphorus-containing organic solvent may include, but are not limited to, one or more of the following: trimethyl phosphate, triethyl phosphate, dimethyl ethyl phosphate, methyl phosphate Diethyl ester, ethylene methyl phosphate, ethylene ethyl phosphate, triphenyl phosphate, trimethyl phosphite, triethyl phosphite, triphenyl phosphite, tris(2,2,2- phosphate Trifluoroethyl) ester and tris(2,2,3,3,3-pentafluoropropyl) phosphate, etc.
  • examples of the sulfur-containing organic solvent may include, but are not limited to, one or more of the following: sulfolane, 2-methylsulfolane, 3-methylsulfolane, dimethylsulfone, disulfone Ethyl sulfone, ethyl methyl sulfone, methyl propyl sulfone, dimethyl sulfoxide, methyl methanesulfonate, ethyl methanesulfonate, methyl ethanesulfonate, ethyl ethanesulfonate, dimethyl sulfate , diethyl sulfate and dibutyl sulfate.
  • some hydrogen atoms of the sulfur-containing organic solvent may be replaced by fluorine.
  • the aromatic fluorinated solvent includes, but is not limited to, one or more of the following: fluorobenzene, difluorobenzene, trifluorobenzene, tetrafluorobenzene, pentafluorobenzene, hexafluorobenzene and trifluoromethylbenzene.
  • the solvent used in the electrolyte of the present application includes cyclic carbonates, chain carbonates, cyclic carboxylates, chain carboxylates, and combinations thereof.
  • the solvent used in the electrolyte of the present application comprises an organic solvent selected from the group consisting of ethylene carbonate, propylene carbonate, diethyl carbonate, ethyl propionate, propionic acid Propyl ester, n-propyl acetate, ethyl acetate and combinations thereof.
  • the solvent used in the electrolyte of the present application comprises: ethylene carbonate, propylene carbonate, diethyl carbonate, ethyl propionate, propyl propionate, ⁇ -butyrolactone and combinations thereof .
  • the electrolyte is not particularly limited, and any known substance as an electrolyte can be used arbitrarily.
  • lithium salts are generally used.
  • electrolytes may include, but are not limited to, inorganic lithium salts such as LiPF 6 , LiBF 4 , LiClO 4 , LiAlF 4 , LiSbF 6 , LiWF 7 ; 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 CO 2 Li, CF 3 CF 2 CF 2 CO 2 Li, CF 3 CF 2 CF 2 Lithium carboxylate salts such as 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
  • the electrolyte is selected from LiPF 6 , LiSbF 6 , 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 , cyclic lithium 1,2-perfluoroethanebissulfonimide, cyclic lithium 1,3-perfluoropropanebissulfonimide, 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.
  • Lithium difluorooxalate borate, lithium bis(oxalate)borate or lithium difluorobis(oxalato)phosphate which help to improve the output power characteristics, high-rate charge and discharge characteristics, and high-temperature storage characteristics of electrochemical devices and cycle characteristics, etc.
  • the content of the electrolyte is not particularly limited as long as the effect of the present application is not impaired.
  • the total molar concentration of lithium in the electrolyte is greater than 0.3 mol/L, greater than 0.4 mol/L or greater than 0.5 mol/L.
  • the total molar concentration of lithium in the electrolyte is less than 3 mol/L, less than 2.5 mol/L or less than 2.0 mol/L.
  • the total molar concentration of lithium in the electrolyte is within the range formed by any two values above. When the electrolyte concentration is within the above range, the lithium as charged particles will not be too small, and the viscosity can be kept in an appropriate range, so it is easy to ensure good electrical conductivity.
  • the electrolyte includes at least one salt selected from the group consisting of monofluorophosphate, borate, oxalate, and fluorosulfonate.
  • the electrolyte includes a salt selected from the group consisting of monofluorophosphate, oxalate, and fluorosulfonate.
  • the electrolyte includes a lithium salt.
  • the salt selected from the group consisting of monofluorophosphate, borate, oxalate, and fluorosulfonate is present at greater than 0.01% or greater than 0.1% by weight of the electrolyte.
  • the salt selected from the group consisting of monofluorophosphate, borate, oxalate, and fluorosulfonate comprises less than 20% or less than 10% by weight of the electrolyte. In some embodiments, the content of the salt selected from the group consisting of monofluorophosphate, borate, oxalate and fluorosulfonate is within the range formed by any two of the above values.
  • the electrolyte includes one or more substances selected from the group consisting of monofluorophosphate, borate, oxalate, and fluorosulfonate and one or more salts other than these.
  • Other salts include the lithium salts exemplified above, and in some examples, LiPF 6 , LiN(FSO 2 )(CF 3 SO 2 ), LiN(CF 3 SO 2 ) 2 , LiN( C 2 F 5 SO 2 ) 2 , cyclic lithium 1,2-perfluoroethanebissulfonimide, cyclic lithium 1,3-perfluoropropanebissulfonimide, 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 .
  • the additional salt is LiPF 6
  • the additional salts are present at greater than 0.01% or greater than 0.1% by weight of the electrolyte. In some embodiments, the additional salts are present at less than 20%, less than 15%, or less than 10% by weight of the electrolyte. In some embodiments, the content of other salts is within the range formed by any two values above. Salts other than these having the above content contribute to the balance of the electrical conductivity and viscosity of the electrolytic solution.
  • the negative electrode includes a negative electrode current collector and a positive electrode active material layer disposed on one or both surfaces of the negative electrode current collector, and the negative electrode active material layer contains the negative electrode active material.
  • the negative electrode active material layer may be one or more layers, and each layer of the multilayer negative electrode active material may contain the same or different negative electrode active materials.
  • the negative electrode active material is any material capable of reversibly intercalating and deintercalating metal ions such as lithium ions.
  • the chargeable capacity of the negative active material is greater than the discharge capacity of the positive active material, so as to prevent unintentional precipitation of lithium metal on the negative electrode during charging.
  • any known current collector can be used arbitrarily.
  • negative electrode current collectors include, but are not limited to, metal materials such as aluminum, copper, nickel, stainless steel, and nickel-plated steel. In some embodiments, the negative current collector is copper.
  • the form of the negative electrode current collector may include, but not limited to, metal foil, metal cylinder, metal strip, metal plate, metal film, expanded metal, stamped metal, foamed metal, etc.
  • the negative electrode current collector is a metal film.
  • the negative electrode current collector is copper foil.
  • the negative electrode current collector is a rolled copper foil based on a rolling method or an electrolytic copper foil based on an electrolytic method.
  • the thickness of the negative electrode current collector is greater than 1 ⁇ m or greater than 5 ⁇ m. In some embodiments, the thickness of the negative electrode current collector is less than 100 ⁇ m or less than 50 ⁇ m. In some embodiments, the thickness of the negative electrode current collector is within the range formed by any two values above.
  • the negative electrode active material is not particularly limited as long as it can reversibly store and release lithium ions.
  • Examples of negative electrode active materials may include, but are not limited to, carbon materials such as natural graphite and artificial graphite; metals such as silicon (Si) and tin (Sn); or oxides of metal elements such as Si and Sn.
  • the negative electrode active materials can be used alone or in combination.
  • the negative active material layer may further include a negative binder.
  • the negative electrode binder can improve the combination of the negative electrode active material particles and the combination of the negative electrode active material and the current collector.
  • the type of negative electrode binder is not particularly limited, as long as it is a material stable to the electrolyte solution or the solvent used in electrode production.
  • the negative binder includes a resin binder.
  • resin binders include, but are not limited to, fluororesins, polyacrylonitrile (PAN), polyimide resins, acrylic resins, polyolefin resins, and the like.
  • the negative electrode binder When using a water-based solvent to prepare the negative electrode mixture slurry, the negative electrode binder includes, but is not limited to, carboxymethyl cellulose (CMC) or its salt, styrene-butadiene rubber (SBR), polyacrylic acid (PAA) or Its salt, polyvinyl alcohol, etc.
  • CMC carboxymethyl cellulose
  • SBR styrene-butadiene rubber
  • PAA polyacrylic acid
  • Its salt polyvinyl alcohol, etc.
  • the negative electrode can be prepared by the following method: coating the negative electrode mixture slurry comprising negative electrode active material, resin binder, etc. on the negative electrode current collector, after drying, calendering to form negative electrode active material layers on both sides of the negative electrode current collector, thus Negative pole is available.
  • a separator is usually provided between the positive electrode and the negative electrode.
  • the electrolytic solution of the present application is usually used by permeating the separator.
  • the material and shape of the separator are not particularly limited as long as the effect of the present application is not significantly impaired.
  • the separator can be resin, glass fiber, inorganic material, etc. formed of materials stable to the electrolyte solution of the present application.
  • the separator includes a porous sheet or a non-woven fabric-like substance with excellent liquid retention properties.
  • the material of the resin or fiberglass separator may include, but are not limited to, polyolefin, aramid, polytetrafluoroethylene, polyethersulfone, and the like.
  • the polyolefin is polyethylene or polypropylene.
  • the polyolefin is polypropylene.
  • the materials for the above separators may be used alone or in any combination.
  • the isolation film can also be a material formed by laminating the above materials, examples of which include, but not limited to, a three-layer isolation film formed by laminating polypropylene, polyethylene, and polypropylene in this order.
  • Examples of materials of inorganic substances may include, but are not limited to, oxides such as aluminum oxide and silicon dioxide, nitrides such as aluminum nitride and silicon nitride, sulfates (eg, barium sulfate, calcium sulfate, etc.).
  • Inorganic forms may include, but are not limited to, granular or fibrous.
  • the form of the separator may be in the form of a film, examples of which include, but are not limited to, non-woven fabrics, woven fabrics, microporous films, and the like.
  • the pore diameter of the isolation membrane is 0.01 ⁇ m to 1 ⁇ m, and the thickness is 5 ⁇ m to 50 ⁇ m.
  • the following separator can also be used: a separator formed by forming a composite porous layer containing the above-mentioned inorganic particles on the surface of the positive electrode and/or negative electrode using a resin-based binder,
  • a separator is formed by using a fluororesin as a binder to form porous layers on both sides of the positive electrode with 90% of the alumina particles having a particle size of less than 1 ⁇ m.
  • the thickness of the separator is arbitrary. In some embodiments, the thickness of the isolation film is greater than 1 ⁇ m, greater than 5 ⁇ m, or greater than 8 ⁇ m. In some embodiments, the thickness of the isolation film is less than 50 ⁇ m, less than 40 ⁇ m or less than 30 ⁇ m. In some embodiments, the thickness of the isolation film is within the range formed by any two values above. When the thickness of the separator is within the above range, insulation and mechanical strength can be ensured, and rate characteristics and energy density of the electrochemical device can be ensured.
  • the porosity of the separator is arbitrary.
  • the isolation membrane has a porosity greater than 10%, greater than 15%, or greater than 20%.
  • the separator has a porosity of less than 60%, less than 50%, or less than 45%.
  • the porosity of the isolation membrane is within the range formed by any two values above. When the porosity of the separator is within the above range, insulation and mechanical strength can be ensured, and membrane resistance can be suppressed, so that the electrochemical device has good safety characteristics.
  • the average pore diameter of the separator is also arbitrary. In some embodiments, the average pore size of the isolation membrane is less than 0.5 ⁇ m or less than 0.2 ⁇ m. In some embodiments, the average pore size of the isolation membrane is greater than 0.05 ⁇ m. In some embodiments, the average pore diameter of the isolation membrane is within the range formed by any two values above. When the average pore diameter of the separator exceeds the above-mentioned range, short circuits are likely to occur. When the average pore diameter of the isolation membrane is within the above range, the electrochemical device has good safety characteristics.
  • the electrochemical device assembly includes an electrode group, a current collecting structure, an outer casing and a protection element.
  • the electrode group may have either a laminated structure in which the positive electrode and the negative electrode are laminated with the separator interposed therebetween, or a structure in which the positive electrode and the negative electrode are wound in a spiral shape with the separator interposed therebetween.
  • the ratio of the mass of the electrode group to the internal volume of the battery is greater than 40% or greater than 50%.
  • the electrode set occupancy is less than 90% or less than 80%.
  • the occupancy of the electrode group is within the range formed by any two values above. When the electrode group occupancy ratio is within the above range, the capacity of the electrochemical device can be ensured, and at the same time, the decrease in characteristics such as repeated charge-discharge performance and high-temperature storage due to an increase in internal pressure can be suppressed.
  • the current collecting structure is not particularly limited. In some embodiments, the current collecting structure is a structure that reduces the resistance of the wiring portion and the bonding portion.
  • the electrode group has the above-mentioned laminated structure, it is suitable to use a structure in which the metal core portions of the electrode layers are bundled and welded to the terminal.
  • the internal resistance increases, so it is also suitable to provide two or more terminals in the electrode to reduce the resistance.
  • the electrode group has the above-mentioned winding structure, the internal resistance can be reduced by providing two or more lead wire structures on the positive electrode and the negative electrode respectively, and bundling them on the terminals.
  • the material of the outer case is not particularly limited, as long as it is stable to the electrolyte solution used.
  • metals such as nickel-plated steel sheets, stainless steel, aluminum or aluminum alloys, and magnesium alloys, or laminated films of resin and aluminum foil can be used, but not limited to.
  • the outer casing is aluminum or aluminum alloy metal or a laminated film.
  • Metal exterior cases include, but are not limited to, encapsulation and sealing structures formed by welding metals together by laser welding, resistance welding, or ultrasonic welding; or riveted structures using the above-mentioned metals through resin spacers.
  • the exterior case using the above-mentioned laminated film includes, but is not limited to, a package sealing structure formed by thermally bonding resin layers to each other, and the like. In order to improve the sealability, a resin different from the resin used in the laminated film may be interposed between the above-mentioned resin layers.
  • a resin having a polar group or a modified resin into which a polar group is introduced can be used as the interposed resin due to the bonding between the metal and the resin.
  • the shape of the exterior body is also arbitrary, and for example, any of cylindrical, square, laminated, button-shaped, large, and the like may be used.
  • Protection elements can use positive temperature coefficient (PTC) whose resistance increases when abnormal heat generation or excessive current flows, temperature fuses, thermistors, cut off by causing the internal pressure of the battery or the internal temperature to rise sharply at the time of abnormal heat generation A valve (current cut-off valve) for the current flowing in the circuit, etc.
  • PTC positive temperature coefficient
  • the above-mentioned protection elements can be selected under the condition that they do not work in the normal use of high current, and can also be designed in such a way that abnormal heat dissipation or thermal runaway will not occur even if there is no protection element.
  • the electrochemical device of the present application includes any device that undergoes an electrochemical reaction, and specific examples thereof include a lithium metal secondary battery or a lithium ion secondary battery.
  • the present application further provides an electronic device, which includes the electrochemical device according to the present application.
  • the application of the electrochemical device of the present application is not particularly limited, and it can be used in any electronic device known in the prior art.
  • the electrochemical device of the present application can be used in, but not limited to, notebook computers, pen-based computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-worn Stereo headphones, VCRs, LCD TVs, portable cleaners, portable CD players, mini discs, transceivers, electronic organizers, calculators, memory cards, portable tape recorders, radios, backup power supplies, motors, automobiles, motorcycles, power assist Bicycles, bicycles, lighting equipment, toys, game consoles, clocks, electric tools, flashlights, cameras, large household storage batteries and lithium-ion capacitors, etc.
  • the lithium ion battery is taken as an example below and the preparation of the lithium ion battery is described in conjunction with specific examples. Those skilled in the art will understand that the preparation method described in this application is only an example, and any other suitable preparation methods are described in this application. within range.
  • the positive electrode slurry was coated on a 12 ⁇ m aluminum foil, dried, cold pressed, cut into pieces, and tabs were welded to obtain a positive electrode.
  • a polyethylene porous polymer film is used as a separator.
  • the electrolyte solution is poured from the liquid injection port, packaged, and then the lithium-ion battery is produced through processes such as formation and capacity.
  • the lithium-ion battery was then short-circuited at 100 m ⁇ for 10 seconds, and then the thickness T 2 of the lithium-ion battery was measured.
  • the high-temperature short-circuit deformation rate of lithium-ion batteries is calculated by the following formula:
  • Short-circuit deformation rate [(T 2 -T 1 )/T 1 ] ⁇ 100%.
  • Overcharge deformation rate [(H 2 -H 1 )/H 1 ] ⁇ 100%.
  • the Li-ion battery was charged at a constant current of 0.5C to 4.7V, and then charged at a constant voltage of 4.7V to 0.05C. Then, the lithium-ion battery was placed in an oven at 50° C., continuously charged at a constant voltage of 4.7 V (the cut-off current was 20 mA), and the thickness change of the lithium-ion battery was monitored. Taking the thickness of the lithium-ion battery at the initial 50% state of charge (SOC) as a benchmark, when the thickness of the lithium-ion battery increases by more than 20%, it is recorded as failure. Record the time from float charge to failure of the lithium-ion battery at 50°C, in hours (h) as the statistical unit.
  • SOC state of charge
  • Table 1 shows the impact of the positive electrode active material and electrolyte on the float performance and safety of the lithium-ion battery, wherein the difluorophosphite compound is the compound of formula II-1.
  • Comparative Example 1-1 although the electrolyte includes a difluorophosphite compound, but the positive electrode active material does not include poly(amic acid), the overcharge deformation rate and short circuit deformation rate of the lithium-ion battery are high and the float charge fails. The time is shorter. As shown in Comparative Examples 1-2, although the positive electrode active material includes poly(amic acid), but the electrolyte does not include difluorophosphite compounds, the overcharge deformation rate and short circuit deformation rate of the lithium ion battery are high and the float charge failure The time is shorter.
  • the overcharge deformation rate and short circuit deformation rate of the lithium-ion battery can be significantly reduced And significantly improve its floating charge failure time.
  • Poly(amic acid)s of different structures can achieve substantially equivalent effects.
  • the overcharge of the lithium-ion battery can be further reduced Deformation rate and short-circuit deformation rate and increase its floating charge failure time.
  • the content of poly(amic acid) in the positive electrode active material layer is in the range of 0.5%-5%, it can further reduce the overcharge deformation rate and short circuit deformation rate of the lithium ion battery and improve its floating charge failure time.
  • the overcharge deformation rate and short circuit deformation rate of the lithium ion battery can be further reduced and the floating charge failure time can be improved.
  • Table 2 shows the effect of difluorophosphite compounds with different structures on the float performance and safety of lithium-ion batteries. Except for the parameters listed in Table 2, the settings of Examples 2-1 to 2-8 are the same as those of Example 1-1.
  • Example 1-1 Formula II-1 16.9 17.8 805
  • Example 2-1 Formula II-2 15.3 16.4 835
  • Example 2-2 Formula II-3 15.2 16.5 842
  • Example 2-3 Formula II-4 15.3 16.2 879
  • Example 2-4 Formula II-5 12.3 12.6 1006
  • Example 2-5 Formula II-6 11.6 11.9 1021
  • Example 2-6 Formula II-7 13.7 12.5 978
  • Example 2-7 Formula II-8 13.2 12.1 993
  • Example 2-8 Formula II-9 12.6 11.8 1068
  • difluorophosphite compounds with different structures can achieve substantially equivalent effects.
  • ether bond embdiment 2-4, 2-5 and 2-8 in the difluorophosphite compound, can further reduce the overcharge deformation rate and the short circuit deformation rate of lithium-ion battery and improve its floating charge failure time .
  • Table 3 shows the influence of the sulfur-oxygen double bond compound on the float performance and safety of the lithium-ion battery, wherein the content of the sulfur-oxygen double bond compound in the electrolyte is 1%. Except for the parameters listed in Table 3, the settings of Examples 3-1 to 3-5 are the same as those of Example 1-1.
  • Example 1-1 16.9 17.8 805
  • Example 3-2 DTD 13.2 14.2
  • Example 3-3 Formula III-1 13.7 14.8 823
  • Example 3-4 Formula III-3 11.5 11.9 895
  • Example 3-5 Formula III-4 11.2 10.5 1124
  • Table 4 shows the effect of the content relationship between the difluorophosphite compound and the sulfur-oxygen double bond compound in the electrolyte on the float performance and safety of the lithium-ion battery. Except for the parameters listed in Table 4, the settings of Examples 4-1 to 4-9 are the same as those of Example 1-1.
  • references to “embodiment”, “partial embodiment”, “an embodiment”, “another example”, “example”, “specific example” or “partial example” in the entire specification mean that At least one embodiment or example in the present application includes a specific feature, structure, material or characteristic described in the embodiment or example.
  • descriptions that appear throughout the specification such as: “in some embodiments”, “in an embodiment”, “in one embodiment”, “in another example”, “in an example In”, “in a particular example” or “example”, they are not necessarily referring to the same embodiment or example in this application.
  • the particular features, structures, materials, or characteristics herein may be combined in any suitable manner in one or more embodiments or examples.

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Abstract

La présente invention concerne un dispositif électrochimique et un dispositif électronique. Spécifiquement, la présente invention concerne un dispositif électrochimique, qui comprend : une électrode positive, une électrode négative et un électrolyte ; l'électrode positive comprend un collecteur de courant d'électrode positive et une couche de matériau actif d'électrode positive formée sur le collecteur de courant d'électrode positive, la couche de matériau actif d'électrode positive comprenant du poly (acide amique), et l'électrolyte comprenant un composé difluorophosphite. Le dispositif électrochimique selon l'invention présente des performances de charge flottante et une sécurité améliorées.
PCT/CN2021/142400 2021-12-29 2021-12-29 Dispositif électrochimique et dispositif électronique WO2023123030A1 (fr)

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