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Lithium ion battery electrolyte and high-energy-density lithium ion battery using same

A technology of lithium ion battery and electrolyte, applied in the field of lithium ion battery electrolyte and high energy density lithium ion battery, can solve the problems of poor stability of silicon carbon negative electrode SEI film, high activity of transition metal ions and easy corrosion by HF, etc. Improve electrical performance, improve high temperature, and improve the effect of high temperature storage

Inactive Publication Date: 2019-04-19
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium-ion battery electrolyte and its The high energy density Li-ion battery of the electrolyte

Method used

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  • Lithium ion battery electrolyte and high-energy-density lithium ion battery using same
  • Lithium ion battery electrolyte and high-energy-density lithium ion battery using same

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specific Embodiment approach 1

[0015] Specific embodiment one: what this embodiment records is a lithium ion battery electrolyte, including organic solvent, lithium salt and additives, described additives include negative electrode film-forming additives, acid anhydride additives and lithium salt additives, in addition, Including nitriles or ether nitriles.

[0016] Negative electrode film-forming additives can form a stable SEI on the negative electrode surface. Nitrile compounds or ether nitrile compounds and acid anhydride compounds can complex the positive electrode or form a stable protective film on the positive electrode surface. Lithium salt additives can improve high temperature performance and / or reduce impedance.

specific Embodiment approach 2

[0017] Specific embodiment two: a kind of lithium ion battery electrolyte described in specific embodiment one, described organic solvent comprises A and / or B, and described A is carbonate or fluorocarbonate, and described B is Carboxylate or fluorocarboxylate; the carbonate is one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate; the fluorine The carbonic acid ester is one or more of the fluorinated compounds corresponding to the carbonic acid ester; the carboxylic acid ester is methyl acetate, ethyl acetate, propyl acetate, n-butyl acetate, isobutyl acetate , n-pentyl acetate, isoamyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate; the fluorocarboxylic acid The ester is one or more of the fluorinated compounds corresponding to the carboxylate.

specific Embodiment approach 3

[0018] Specific embodiment three: a lithium ion battery electrolyte described in specific embodiment one, the mass fraction of lithium salt in the electrolyte in the electrolyte is 10wt% ~ 20wt%, preferably 12% ~ 16% %; The lithium salt is lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium bis(oxalate) borate (LiBOB), lithium difluoro(oxalate) borate (LiODFB), lithium difluorodioxalate phosphate (LiDFOP), lithium tetrafluorooxalate phosphate (LiTFOP), bistrifluoromethylsulfonyl Amine (LiTFSI), lithium trifluoromethanesulfonate (LiSO 3 CF 3 ) in one or more.

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Abstract

The invention provides a lithium ion battery electrolyte and a high-energy-density lithium ion battery using the same. The lithium ion battery electrolyte comprises a non-aqueous organic solvent, a lithium salt and additives. The additives comprise a negative electrode film-forming additive, a nitrile or ether nitrile compound, an acid anhydride compound and a lithium salt type additive. Accordingto the lithium ion battery electrolyte, 0.3-20wt% of the negative electrode film-forming additive such as vinylene carbonate and / or fluorocarbonate can form an excellent SEI film on a carbon-containing negative electrode, a silicon-containing negative electrode or a silicon carbon alloy negative electrode and the like, thereby stabilizing the negative electrode and ensuring excellent battery performance; 0.2-6.5wt% of the nitrile or ether nitrile compound, the acid anhydride compound and a combination of them can complex metal ions of a positive electrode or form a protective film on the surface of the positive electrode, thereby stabilizing the positive electrode and improving battery performance; and the 0.5-3 wt% of the lithium salt type additive in the lithium ion battery electrolytecan lower the impedance of the battery so as to improve the low temperature performance of the battery or improve the high temperature performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a lithium ion battery electrolyte and a high energy density lithium ion battery using the electrolyte. Background technique [0002] As countries all over the world have higher and higher requirements on the environment, the requirements on vehicle exhaust are becoming more and more stringent, especially the emission standards of carbon dioxide and nitrogen oxides produced in fossil energy. New energy vehicles emerged at the historic moment, and their power was provided by lithium-ion batteries or part of the power was replaced by lithium batteries, that is, oil-electric hybrids were used to reduce exhaust emissions. The current mainstream new energy vehicles on the market are as follows: battery electric vehicles (BEV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), fuel electric vehicles (FCEV), and range-extended electric vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 曾长安李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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