Lithium-ion power battery electrolyte for high/low temperature environment

A power battery and electrolyte technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of shortened cycle life, low charge and discharge capacity, and poor storage performance, so as to improve high temperature performance, improve discharge characteristics, The effect of suppressing side effects

Inactive Publication Date: 2015-07-29
WANXIANG 123 CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium ion power battery electrolyte suitable for high and low temperature environments, and improve the components of lithium salts, organic solvents, and film-forming additives to meet the requirements of charging and discharging lithium ion batteries under high and low temperature conditions. , cycle and storage performance, which solves the problems of low charge and discharge capacity, shortened cycle life and poor storage performance of the existing lithium-ion power battery electrolyte in high and low temperature environments

Method used

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Effect test

Embodiment 1

[0020] Organic solvent: ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and ethyl acetate, lithium salt: lithium hexafluorophosphate and lithium bis(trifluoromethanesulfonic acid)imide, negative film-forming additives: ethylene carbonate, propane Sultone and fluorovinyl ester are uniformly mixed according to the proportion to obtain the lithium ion power battery electrolyte suitable for high and low temperature environments of the present invention, wherein, ethylene carbonate: ethyl methyl carbonate: dimethyl carbonate: ethyl acetate The volume ratio is 2:2:5:1, the molar concentration of lithium hexafluorophosphate is 0.8mol / L, the molar concentration of lithium bis(trifluoromethanesulfonic acid)imide is 0.1mol / L, and the molar concentration of vinylene carbonate and propanesulfonic acid The ratios of ester and fluorovinyl ester to the total weight of lithium salt and organic solvent are 1%, 2%, and 2%, respectively.

Embodiment 2

[0022] Organic solvent: ethylene carbonate, diethyl carbonate, ethyl methyl carbonate and methyl acetate, lithium salt: lithium hexafluorophosphate and lithium bis(trifluoromethanesulfonic acid) imide, negative film-forming additives: vinylene carbonate, Vinyl sulfite and butane sultone are uniformly mixed according to the proportion to obtain the lithium ion power battery electrolyte suitable for high and low temperature environments of the present invention, wherein, ethylene carbonate: diethyl carbonate: ethyl methyl carbonate: acetic acid The volume ratio of methyl ester is 3:4:2:1, the molar concentration of lithium hexafluorophosphate is 0.9mol / L, the molar concentration of lithium bis(trifluoromethanesulfonic acid)imide is 0.1mol / L, vinylene carbonate, sulfurous acid The ratios of vinyl ester and butane sultone added to the total weight of lithium salt and organic solvent are 2%, 1%, and 1%, respectively.

Embodiment 3

[0024] Organic solvents: ethylene carbonate, propylene carbonate, ethyl methyl carbonate and methyl propionate, lithium salts: lithium hexafluorophosphate and lithium difluorooxalate borate, negative electrode film-forming additives: ethylene carbonate, vinyl sulfite and vinyl fluoride Ester, mix evenly by proportioning and promptly obtain the lithium ion battery electrolyte that the present invention is applicable to high and low temperature environment, wherein, ethylene carbonate: propylene carbonate: ethyl methyl carbonate: the volume ratio of methyl propionate is 3:1: 4:2, the molar concentration of lithium hexafluorophosphate is 0.9mol / L, the concentration of lithium difluorooxalate borate is 0.2mol / L, the amount of vinylene carbonate, vinyl sulfite, and fluorovinyl ester accounts for the total weight of lithium salt and organic solvent The ratios are 2%, 1%, and 2% respectively.

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Abstract

The invention discloses a lithium-ion power battery electrolyte for a high / low temperature environment. The electrolyte comprises a lithium salt, an organic solvent and a negative electrode film forming additive. The lithium salt is a mixture of lithium hexafluorophosphate and lithium dis(trifluoromethanesulfonyl)imide or a mixture of lithium hexafluorophosphate and lithium difluoro(oxalato)borate. The organic solvent is a mixture of a carbonic ester solvent and a carboxylate solvent and a volume ratio of the carbonic ester solvent to the carboxylate solvent is 7-9: 1-3. Through modification of the lithium salt, the organic solvent and the film forming additive, charging-discharging, cycle and storage performances of the lithium-ion battery under condition of high / low temperature are obtained, and the problem that the existing lithium-ion power battery electrolyte has a low charging-discharging capacity, a short cycle life and poor storage performances in a high / low temperature environment is solved.

Description

technical field [0001] The invention relates to a lithium ion power battery electrolyte, in particular to a lithium ion power battery electrolyte suitable for high and low temperature environments. Background technique [0002] Lithium-ion power batteries are used in electric vehicles and large-scale energy storage equipment, and must have a wide operating temperature range. During the use of electric vehicles, due to the large capacity of the power battery itself, the heat is large, especially in summer, the battery often needs Working in a high temperature (greater than 45°C) environment requires the battery to have good high temperature resistance to ensure that the battery has good cycle performance at high temperatures; at the same time, in order to adapt to the cold weather in northern winter, the temperature Usually lower than -20°C, which requires the electrolyte to have excellent low-temperature performance to ensure that electric vehicle batteries can still work no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569Y02E60/10
Inventor 严红袁园吕豪杰
Owner WANXIANG 123 CO LTD
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