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Lithium ion electrolyte and lithium ion battery using same

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as battery gas production or performance deterioration, and achieve the effects of improving battery performance, slowing down decomposition, and reducing the content of harmful substances

Inactive Publication Date: 2019-03-29
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 solve the problem of decomposition of lithium salt in the existing lithium battery and its side reaction with trace water to cause gas production or performance degradation of the battery, to provide a lithium ion battery electrolyte and to use the electrolyte lithium-ion battery

Method used

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  • Lithium ion electrolyte and lithium ion battery using same
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specific Embodiment approach 1

[0012] Specific embodiment 1: This embodiment describes a lithium-ion battery electrolyte, including organic solvents, lithium salts and additives. The organic solvents include A and / or B, and the A is carbonate or fluorinated Carbonic acid ester, described B is carboxylate or fluorocarboxylate; Described lithium salt comprises lithium hexafluorophosphate (LiPF 6 ), in addition, described lithium salt also comprises high-content two trifluoromethanesulfonimide (LiTFSI) and / or bis (fluorosulfonyl) imide lithium (LiFSI); Described additive comprises negative pole film-forming additive and / or cathodic protection additives.

specific Embodiment approach 2

[0013] Specific embodiment two: a kind of lithium-ion battery electrolyte described in specific embodiment one, described carbonate is ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate One or more; the carboxylate is propyl acetate, n-butyl acetate, isobutyl acetate, n-pentyl acetate, isopentyl acetate, ethyl propionate, n-propyl propionate, butyric acid Methyl ester, ethyl n-butyrate or one or more of the above-mentioned fluorinated solvents.

specific Embodiment approach 3

[0014] Specific embodiment three: a kind of lithium-ion battery electrolyte described in specific embodiment one, described lithium hexafluorophosphate (LiPF 6 ) in the electrolyte is 5% to 20%, preferably 8% to 14%; the mass fraction of the bistrifluoromethylsulfonimide (LiTFSI) in the electrolyte is 0.5% to 8%, preferably 3% to 6%; the mass fraction of lithium bis(fluorosulfonyl)imide (LiFSI) in the electrolyte is 0.5% to 6%, preferably 1% to 4%.

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Abstract

A lithium ion electrolyte and a lithium ion battery using the same are provided. The lithium ion electrolyte includes a solvent, a lithium salt, and an additive. The lithium salt includes lithium hexafluorophosphate (LiPF6), high-content bistrifluoromethylsulfonimide (LiTFSI) and / or lithium bis(fluorosulfonyl)imide (LiFSI). The additive includes vinylene carbonate ester (VC), fluoroethylene carbonate (FEC), 1,3 propane sultone (PS), and ethylene carbonate (VEC). The electrolyte of the present invention can improve the cycling and high-temperature storage performance of a lithium battery by using the high-content bistrifluoromethylsulfonimide (LiTFSI) and / or lithium bis(fluorosulfonyl)imide (LiFSI) in combination with a negative electrode film-forming additive and / or a positive electrode protective additive. The lithium ion electrolyte is applicable to lithium ion batteries in a range of 4.2V and above.

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 lithium ion battery using the electrolyte. Background technique [0002] Since its commercialization, lithium-ion batteries have been widely used in digital, energy storage, power, military aerospace and communication equipment and other fields due to their light weight, high specific energy, no memory effect, and good cycle performance. With the wide application of lithium-ion batteries, consumers have put forward higher requirements for the energy density, cycle life, high temperature performance, safety and other performance of lithium-ion batteries. [0003] There are two ways to increase the energy density. On the one hand, the charging voltage of the battery can be increased, the positive electrode with a higher charging voltage can be used, the voltage of the existing battery can be increased by technology, or t...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M2300/0025H01M2300/0037Y02E60/10
Inventor 曾长安李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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