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WO2018120794A1 - Électrolyte et batterie secondaire - Google Patents

Électrolyte et batterie secondaire Download PDF

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Publication number
WO2018120794A1
WO2018120794A1 PCT/CN2017/093864 CN2017093864W WO2018120794A1 WO 2018120794 A1 WO2018120794 A1 WO 2018120794A1 CN 2017093864 W CN2017093864 W CN 2017093864W WO 2018120794 A1 WO2018120794 A1 WO 2018120794A1
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Prior art keywords
group
electrolyte
compound
secondary battery
carbonate
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English (en)
Chinese (zh)
Inventor
王小梅
付成华
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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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
    • 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
    • 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 invention relates to the field of battery technologies, and in particular, to an electrolyte and a secondary battery.
  • Secondary batteries especially lithium ion secondary batteries, are the working power source for electronic products. They have high energy density, no memory effect, high working voltage, etc., and are gradually replacing traditional Ni-Cd and MH-Ni batteries.
  • secondary batteries with the expansion of the demand for electronic products and the development of power and energy storage equipment, people's requirements for secondary batteries are constantly increasing. It is imperative to develop secondary batteries with high energy density and satisfying rapid charge and discharge.
  • an effective method is to increase the voltage of the electrode active material, the compaction density, and the selection of a suitable electrolyte.
  • an electrolyte widely used in a lithium ion secondary battery includes an electrolyte having lithium hexafluorophosphate as an electrolyte salt and a mixture of a cyclic carbonate and a chain carbonate as an organic solvent.
  • the above electrolyte has many disadvantages, particularly Under high voltage, the secondary battery's cycle performance, high temperature storage performance, safety performance and rate performance are poor.
  • an object of the present invention is to provide an electrolyte and a secondary battery, which can improve the rate performance, the normal temperature cycle performance, and the high temperature storage of the secondary battery when the electrolyte is applied to the secondary battery. Performance and overcharge security.
  • the invention provides an electrolyte comprising: an electrolyte, an organic solvent, and an additive.
  • the organic solvent includes a carboxylate compound.
  • the additive includes a dinitrile compound, an aromatic compound overcharge additive, and fluoroethylene carbonate and/or vinylene carbonate.
  • the invention provides a secondary battery comprising an electrolyte according to an aspect of the invention.
  • the rate performance, the normal temperature cycle performance, the high temperature storage performance, and the overcharge safety performance of the secondary battery can be improved.
  • the electrolytic solution according to the first aspect of the invention includes an electrolyte salt, an organic solvent, and an additive.
  • the organic solvent includes a carboxylate compound.
  • the additive includes a dinitrile compound, an aromatic compound overcharge additive, and fluoroethylene carbonate and/or vinylene carbonate.
  • the carboxylate compound is used for improving the rate performance of the secondary battery, but when the carboxylate compound is applied to a secondary battery of a high voltage system, it is easily oxidized.
  • the secondary battery using the carboxylic acid ester compound is decomposed and used in a high-temperature environment, the capacity loss after repeated cycles of the secondary battery is severe, and the high-temperature storage performance of the secondary battery is seriously deteriorated.
  • the dinitrile compound can be complexed with the positive electrode of the secondary battery, and the side reaction at the time of reducing the high temperature also reduces the kinetic performance of the secondary battery, and the dinitrile compound is easy to be in the negative electrode due to its strong electron absorption characteristics.
  • the electron reduction reaction is obtained, and the product obtained by the reduction is unstable, and can be deposited on the negative electrode, thereby affecting the normal temperature cycle performance and the rate performance of the secondary battery.
  • the fluoroethylene carbonate and/or vinylene carbonate can preferentially form a film on the surface of the negative electrode, suppress the reduction of the carboxylic acid ester compound and the side reaction of the dinitrile compound, thereby improving the normal temperature cycle performance of the secondary battery, but the fluoroethylene carbonate
  • the ester generates HF on the surface of the high voltage positive electrode, and the vinylene carbonate oxidizes on the surface of the positive electrode, both of which increase the gas production of the secondary battery and deteriorate the high temperature storage performance of the secondary battery.
  • the aromatic compound overcharge additive can improve the overcharge safety performance of the secondary battery, but when the content thereof is increased, the viscosity of the electrolyte is increased to deteriorate the dynamic performance of the secondary battery.
  • the electrolyte is simultaneously added with a carboxylate compound, a dinitrile compound, an aromatic compound overcharge additive, and a fluoroethylene carbonate and/or a vinylene carbonate, the secondary battery can be simultaneously improved by the synergistic action of the above substances. Rate performance, high temperature storage performance, ambient temperature cycling performance, and overcharge safety.
  • the carboxylic acid ester compound is selected from one or more of the compounds represented by Formula 1.
  • R 1 and R 2 are each independently selected from the group consisting of an alkane group having 1 to 10 carbon atoms and a halogenated alkane group having 1 to 10 carbon atoms.
  • the halogen atom in the halogenated alkane group is one or more selected from the group consisting of F, Cl, Br, and I.
  • the alkane group having 1 to 10 carbon atoms may be a chain alkane group or a cyclic alkane group.
  • the chain alkane group further includes a linear alkane group and a branched alkane group.
  • the cyclic alkane group may have a substituent or may not contain a substituent.
  • a preferred lower limit of the number of carbon atoms may be 1, 2, and 3, and a preferred upper limit of the number of carbon atoms may be 4, 5, 6, 7, 8, 9, or 10.
  • R 1 and R 2 are each independently selected from a chain alkane group having 1 to 6 carbon atoms or a cyclic alkane group having 3 to 8 carbon atoms. Still more preferably, R 1 and R 2 are each independently selected from a chain alkane group having 1 to 4 carbon atoms or a cyclic alkane group having 5 to 7 carbon atoms.
  • the alkane group having 1 to 10 carbon atoms may be selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, Cyclobutyl, n-pentyl, isopentyl, tert-amyl, neopentyl, cyclopentyl, 2,2 dimethylpropyl, 1-ethylpropyl, 1-methylbutyl, 2-methyl Butyl, n-hexyl, isohexyl, 2-hexyl, 3-hexyl, cyclohexyl, 2-methylpentyl, 3-methylpentyl, 1,1,2-trimethylpropyl, 3,3 - dimethylbutyl, n-heptyl, 2-heptyl, 3-heptyl, 2-methylhexyl, 3-methylhexyl,
  • the number of substitution of the halogen atom in the halogenated alkane group having 1 to 10 carbon atoms and the position of substitution thereof are not particularly limited, and may be selected according to actual needs.
  • the number of halogen atoms may be one, two, three or four.
  • the types of the halogen atoms may be the same, or they may be completely different or partially the same.
  • the haloalkane group may be a chain haloalkane group or a cyclic haloalkane group.
  • the chain haloalkane group in turn includes a linear haloalkane group and a branched haloalkane group.
  • the cyclic haloalkane group may or may not have a substituent.
  • a preferred lower limit of the number of carbon atoms may be 1, 2, and 3, and a preferred upper limit of the number of carbon atoms may be 4, 5, 6, 7, 8, 9, or 10.
  • R 1 and R 2 are each independently selected from a chain halogenated alkane group having 1 to 6 carbon atoms or a cyclic halogenated alkane group having 3 to 8 carbon atoms. Still more preferably, each of R 1 and R 2 is independently selected from a chain halogenated alkane group having 1 to 4 carbon atoms or a cyclic halogenated alkane group having 5 to 7 carbon atoms.
  • the halogenated alkane group having 1 to 10 carbon atoms is selected from the group consisting of chloromethyl, dichloromethyl, trichloromethyl, 1-chloroethyl, 1,2-dichloroethyl, 2-chloro-n-propyl , 2,2-dichloro-n-propyl, 1-chloroisopropyl, monochlorocyclopropyl, 1-chloro-n-butyl, 2-chloroisobutyl, monochlorocyclobutyl, 1-chloro-n-pentane Base, 2-chloro-n-pentyl, 1-chloroisopentyl, 2,2-dichloromethylpropyl, monochlorocyclopentyl, 3-chloro-2,2-dimethylpropyl, 1-chloro 1-ethylpropyl, 1-chloro-1-methylbutyl, 2-chloro-2-methylbutyl, 2-chloro-n-hexy
  • the carboxylic acid ester compound may be selected from the group consisting of methyl formate, ethyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, and propionic acid.
  • the carboxylic acid ester compound is selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and the aforementioned carboxylate compound is F, Cl, Br, One or more of one or more partially substituted or fully substituted compounds of I.
  • the dinitrile compound is selected from one or more of the compounds represented by Formula 2.
  • R 3 is selected from the group consisting of an alkylene group having 1 to 20 carbon atoms, a halogenated alkylene group having 1 to 20 carbon atoms, an alkyleneoxy group having 1 to 20 carbon atoms, and a carbon atom.
  • a halogenated atom selected from the group consisting of a halogenated alkyleneoxy group having 1 to 20, an alkylene group having 2 to 20 carbon atoms, and a halogenated alkylene group having 2 to 20 carbon atoms.
  • Cl, Br, and I One or more of Cl, Br, and I.
  • R 3 is selected from the group consisting of an alkylene group having 1 to 10 carbon atoms, a halogenated alkylene group having 1 to 10 carbon atoms, and a carbon number.
  • One of the halogen atoms selected from one or more of F, Cl, and Br.
  • the number of oxygen atoms in the alkyleneoxy group or the haloalkyleneoxy group may be one, two or more.
  • the dinitrile compound is selected from the group consisting of malononitrile, succinonitrile, 2-methylsuccinonitrile, tetramethylsuccinonitrile, glutaronitrile, 2- Methylglutaronitrile, adiponitrile, fumaronitrile, 2-methylene glutaronitrile, 3,5-dioxa-heptonitrile, ethylene glycol bis(2-cyanoethyl) ether, Diethylene glycol bis(2-cyanoethyl)ether, triethylene glycol bis(2-cyanoethyl)ether, tetraethylene glycol bis(2-cyanoethyl)ether, 1,2-di (2-Cyanoethoxy)ethane, 1,3-bis(2-cyanoethoxy)propane, 1,4-bis(2-cyanoethoxy)butane, 1,5-di ( 2-cyanoethoxy)pentane, ethylene glycol bis(4-
  • the aromatic compound overcharge additive is selected from the group consisting of biphenyl, cyclohexylbenzene, toluene, xylene, fluorobenzene, t-butylbenzene, and tert-amylbenzene. kind or several.
  • the volume of the carboxylate compound is 5% to 50% of the total volume of the organic solvent.
  • the volume of the carboxylic acid ester compound is from 10% to 40% of the total volume of the organic solvent.
  • the volume of the carboxylate compound is from 20% to 35% of the total volume of the organic solvent.
  • the content of the dinitrile compound is from 0.5% to 10% by weight based on the total weight of the electrolytic solution.
  • the content of the dinitrile compound is from 1% to 5% by weight based on the total weight of the electrolyte.
  • the aromatic compound overcharge additive is contained in an amount of from 0.5% to 15% by weight based on the total mass of the electrolytic solution.
  • the content of the aromatic compound overcharge additive is from 1% to 5% of the total weight of the electrolyte.
  • the total content of the fluoroethylene carbonate and/or the vinylene carbonate is 0.05% to 12% of the total weight of the electrolytic solution.
  • the content of the fluoroethylene carbonate is 0.5% to 10% of the total weight of the electrolytic solution. Further preferably, the content of the fluoroethylene carbonate is 1% to 5% of the total weight of the electrolytic solution.
  • the vinylene carbonate is contained in an amount of 0.05% to 5% by weight based on the total mass of the electrolytic solution. Further preferably, the vinylene carbonate is contained in an amount of 0.2% to 1% by weight based on the total weight of the electrolytic solution.
  • the electrolyte salt may be selected from a lithium salt, a sodium salt or a zinc salt, which varies depending on the secondary battery to which the electrolyte is applied.
  • the content of the electrolyte salt is 6.2% to 25% of the total weight of the electrolytic solution.
  • the content of the electrolyte salt is 6.25% to 18.8% of the total weight of the electrolyte.
  • the content of the electrolyte salt is 10% to 15% of the total weight of the electrolyte.
  • the specific kind of the organic solvent is not particularly limited and may be selected according to actual needs.
  • a non-aqueous organic solvent is used.
  • the non-aqueous organic solvent may include any kind of carbonate and a halogenated compound of a carbonate.
  • the carbonate may include a cyclic carbonate and a chain carbonate.
  • the organic solvent may be selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate, pentylene carbonate, dimethyl carbonate (DMC), and diethyl carbonate (DEC).
  • EMC ethyl methyl carbonate
  • BL ⁇ -butyrolactone
  • THF tetrahydrofuran
  • the electrolytic solution may be prepared by a conventional method, for example, mixing the respective materials in the electrolytic solution uniformly.
  • a secondary battery according to a second aspect of the invention includes the electrolytic solution according to the first aspect of the invention.
  • the secondary battery further includes: a positive electrode sheet, a negative electrode sheet, and a separator.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode film disposed on the positive electrode current collector, and the positive electrode film includes a positive electrode active material, a binder, and a conductive agent.
  • the negative electrode sheet includes a negative electrode current collector and an negative electrode film disposed on the negative electrode current collector, and the negative electrode film includes a negative electrode active material, a binder, and may also include a conductive agent.
  • the separator is spaced between the positive electrode tab and the negative electrode tab.
  • the separator may be any separator material used in the existing secondary battery, such as polyethylene, polypropylene, polyvinylidene fluoride, and multilayers thereof. Composite membranes, but are not limited to these.
  • the secondary battery may be a lithium ion secondary battery, a sodium ion secondary battery, or a zinc ion secondary battery.
  • the electrolyte salt may be selected from a lithium salt, and the lithium salt may be selected from the group consisting of LiPF 6 , LiBF 4 , LiFSI, LiTFSI, LiClO 4 , LiAsF 6 , LiBOB, LiDFOB, LiPO.
  • LiPF 6 LiBF 4 , LiFSI, LiTFSI, LiClO 4 , LiAsF 6 , LiBOB, LiDFOB, LiPO.
  • LiPF 6 LiBF 4 , LiFSI, LiTFSI, LiClO 4 , LiAsF 6 , LiBOB, LiDFOB, LiPO.
  • LiTFOP LiN(SO 2 RF) 2
  • LiN(SO 2 F)(SO 2 RF)(SO 2 RF) LiN(SO 2 F)(SO 2 RF)
  • n is an integer within 1 to 10.
  • the lithium salt is LiPF 6 .
  • the positive electrode active material may be selected from lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), spinel-type LiMn 2 O 4 , olivine-type LiMPO 4 , one of ternary positive electrode materials LiNi x A y B (1-xy) O 2 and Li 1-x' (A' y' B' z' C 1-y'-z' ) O 2 or Several.
  • M is selected from one or more of Co, Ni, Fe, Mn, and V; and in the ternary positive electrode material LiNi x A y B (1-xy) O 2 , A and B are each independently selected from one of Co, Al, and Mn, and A and B are not the same, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1 and x+y ⁇ 1; in the ternary positive electrode material Li 1 -x' (A' y' B' z' C 1-y'-z' ) In O 2 , A', B', and C are each independently selected from one of Co, Ni, Fe, and Mn, 0 ⁇ x' ⁇ 1, 0 ⁇ y' ⁇ 1, 0 ⁇ z' ⁇ 1 and y'+z' ⁇ 1, and A', B', and C are different.
  • the anode active material may be selected from metallic lithium.
  • the negative active material may also be selected from materials capable of intercalating lithium at ⁇ 2 V (vs. Li/Li + ).
  • the negative active material may be selected from natural graphite, artificial graphite, mesophase micro carbon spheres ( Abbreviated as MCMB), hard carbon, soft carbon, silicon, silicon-carbon composite, Li-Sn alloy, Li-Sn-O alloy, Sn, SnO, SnO 2 , spinel structure lithiated TiO 2 -Li 4 One or more of Ti 5 O 12 and Li-Al alloy.
  • the secondary battery is a sodium ion secondary battery or a zinc ion secondary battery, it is only necessary to change the corresponding positive electrode active material, negative electrode active material, and electrolyte salt.
  • the lithium ion secondary batteries of Examples 1-17 and Comparative Examples 1-15 were all prepared in the following manner.
  • the positive electrode active material lithium cobaltate (LiCoO 2 ), the binder polyvinylidene fluoride, and the conductive agent acetylene black are mixed at a weight ratio of 96:2:2, and N-methylpyrrolidone (NMP) is added under the action of a vacuum mixer.
  • NMP N-methylpyrrolidone
  • the negative active material artificial graphite, thickener sodium carboxymethyl cellulose (CMC), and binder styrene-butadiene rubber were mixed at a weight ratio of 97:1:2, and added to deionized water under the stirring of a vacuum mixer.
  • CMC thickener sodium carboxymethyl cellulose
  • binder styrene-butadiene rubber were mixed at a weight ratio of 97:1:2, and added to deionized water under the stirring of a vacuum mixer.
  • the content of LiPF 6 is 12.5% of the total weight of the electrolyte.
  • the specific types and contents of the carboxylic acid ester compound, the dinitrile compound, the aromatic compound overcharge additive, the fluoroethylene carbonate, and the vinylene carbonate used in the electrolytic solution are shown in Table 1.
  • the content of the carboxylate compound is a volume percentage calculated based on the total volume of the organic solvent
  • the content of the dinitrile compound, the aromatic compound overcharge additive, the fluoroethylene carbonate, and the vinylene carbonate is based on the electrolyte.
  • the total weight is calculated as a percentage by weight.
  • a 16 ⁇ m thick polypropylene separator (model C210, supplied by Celgard) was used.
  • the positive electrode sheet, the separator film and the negative electrode sheet are stacked in order, so that the separator is in a role of isolation between the positive and negative electrode sheets, and then wound to obtain a bare cell; the bare cell is placed in the outer package foil, and the electricity is placed in the outer package foil.
  • the prepared electrolyte is injected into the dried bare cell, and after vacuum encapsulation, standing, formation, shaping, etc., lithium ion II is obtained. Secondary battery.
  • the lithium ion secondary battery was charged at a constant current of 1 C (nominal capacity) to a voltage of 4.3 V at 25 ° C, and then charged to a current of ⁇ 0.05 C at a constant voltage of 4.3 V, left for 5 minutes, and discharged at a constant current of 0.2 C. Up to the voltage of 3V, the actual discharge capacity is recorded as D0.
  • the lithium ion secondary battery is charged at a constant current of 1 C to a voltage of 4.3 V, and then charged at a constant voltage of 4.3 V until the current is ⁇ 0.05 C. After being left for 5 minutes, the battery is discharged at a constant current of 2 C to a voltage of 3 V, and the discharge capacity at this time is discharged. Recorded as D1.
  • Lithium ion secondary battery 2C/0.2C rate performance D1/D0 ⁇ 100%. 15 lithium ion secondary batteries were tested in each group and averaged.
  • the lithium ion secondary battery was charged at a constant current of 1 C to a voltage of 4.3 V at 25 ° C, then charged at a constant voltage to a current of 0.05 C, and then discharged at a constant current of 1 C to a voltage of 3.0 V, which is a charge and discharge cycle.
  • this discharge capacity is the discharge capacity of the first cycle.
  • the lithium ion secondary battery was subjected to 300 cycles of charge/discharge test in accordance with the above method, and the discharge capacity at the 300th cycle was detected.
  • the capacity retention ratio (%) of the lithium ion secondary battery after 300 cycles at 25 ° C (discharge capacity after 300 cycles of lithium ion secondary battery / discharge capacity after the first cycle of lithium ion secondary battery) ⁇ 100%. 15 lithium ion secondary batteries were tested in each group and averaged.
  • the lithium ion secondary battery was charged at a constant current of 0.5 C to a voltage of 4.3 V at 25 ° C, and then charged at a constant voltage of 4.3 V until the current was 0.05 C.
  • the thickness of the lithium ion secondary battery was tested and recorded as h 0 ; Thereafter, the lithium ion secondary battery was placed in an incubator at 60 ° C, taken out after storage for 30 days, and the thickness of the lithium ion secondary battery was measured and recorded as h 1 .
  • the thickness expansion ratio of the lithium ion secondary battery after storage at 60 ° C for 30 days [(h 1 -h 0 ) / h 0 ] ⁇ 100%. 15 lithium ion secondary batteries were tested in each group and averaged.
  • the lithium ion secondary battery was charged at a constant current of 3 C (nominal capacity) to a voltage of 7.5 V at 25 ° C, and then subjected to constant voltage charging at 7.5 V for 5 hours, and the state of the lithium ion secondary battery was observed.
  • the pass rate of the lithium ion secondary battery can be calculated by taking no fire, no burning, or no explosion as a criterion.
  • the addition of the carboxylate compound and the dinitrile compound in Comparative Example 6 can improve the rate performance while improving the high temperature storage performance, but the normal temperature cycle performance is deteriorated.
  • the simultaneous addition of the carboxylate compound and the aromatic compound overcharge additive can achieve both the rate performance and the overcharge safety performance, but the room temperature cycle performance and the high temperature storage performance deteriorate.
  • the addition of the carboxylate compound and the fluoroethylene carbonate in Comparative Example 8 can improve the rate performance and the normal temperature cycle performance, but deteriorates the high temperature storage performance.
  • the addition of the dinitrile compound and the aromatic compound overcharge additive can improve the high temperature storage performance and the overcharge safety performance, but the rate performance and the normal temperature cycle performance deteriorate.
  • the simultaneous addition of the dinitrile compound and the fluoroethylene carbonate in Comparative Example 10 can improve the high temperature storage performance and the normal temperature cycle performance, but the rate performance is poor.
  • the addition of the aromatic compound overcharge additive and the fluoroethylene carbonate in Comparative Example 11 can improve the normal temperature cycle performance and the overcharge safety performance, but deteriorate the high temperature storage performance.
  • the addition of a carboxylate compound, a dinitrile compound, and an aromatic compound overcharge additive in Comparative Example 12 can improve rate performance, high temperature storage performance, and overcharge safety performance, but the room temperature cycle performance deteriorates.
  • the simultaneous addition of a carboxylate compound, a dinitrile compound, and a fluoroethylene carbonate in Comparative Example 13 can improve rate performance, high temperature storage performance, and room temperature cycle performance, but the lithium ion secondary battery cannot pass the overcharge test.
  • the simultaneous addition of a carboxylate compound, an aromatic compound overcharge additive, and a fluoroethylene carbonate in Comparative Example 14 can improve rate performance, overcharge safety performance, and room temperature cycle performance, but deteriorates high temperature storage performance.
  • the addition of the dinitrile compound, the aromatic compound overcharge additive, and the fluoroethylene carbonate in Comparative Example 15 can improve high temperature storage performance, overcharge safety performance, and normal temperature cycle performance, but the rate performance deteriorates.

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Abstract

L'invention porte sur un électrolyte et sur une batterie secondaire. L'électrolyte comprend un sel d'électrolyte, un solvant organique et un additif. Le solvant organique comprend un composé carboxylate. L'additif comprend un composé dinitrile, un additif composé aromatique de surcharge, du carbonate de fluoroéthylène et/ou du carbonate de vinylène. Lorsque l'électrolyte est appliqué dans la batterie secondaire, les performances de vitesse, les performances de circulation à température normale, les performances de stockage à haute température et les performances de sécurité de surcharge de la batterie secondaire peuvent être améliorées.
PCT/CN2017/093864 2016-12-26 2017-07-21 Électrolyte et batterie secondaire Ceased WO2018120794A1 (fr)

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CN201611218759.2 2016-12-26
CN201611218759.2A CN108242556B (zh) 2016-12-26 2016-12-26 电解液及二次电池

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CN113767502A (zh) * 2019-11-18 2021-12-07 株式会社Lg新能源 锂二次电池用非水电解质溶液和包含其的锂二次电池
EP3985775A1 (fr) * 2020-10-16 2022-04-20 Tiamat SAS Électrolyte pour batterie na-ion
WO2022126139A3 (fr) * 2020-12-11 2022-08-04 Sila Nanotechnologies Inc. Électrolytes pour cellules de batterie lithium-ion avec des particules d'anode à variation de volume
WO2023177892A1 (fr) * 2022-03-18 2023-09-21 Sila Nanotechnologies, Inc. Compositions d'électrolyte pour éléments de batterie lithium-ion avec anodes comprenant un mélange de particules composites de silicium-carbone et de particules de graphite
US12243985B2 (en) 2019-11-18 2025-03-04 Lg Energy Solution, Ltd. Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

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