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A kind of electrolyte of lithium ion battery and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of lithium-ion battery gas swelling damage, electrolyte instability, gas generation, etc., to improve cycle stability, weaken decomposition and improve stability. Effect

Active Publication Date: 2018-07-24
WUHU LION AUTOMOTIVE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The electrolyte solution of the lithium-ion battery provided by the prior art, its electrolyte is unstable at high temperature, easily decomposes, and produces gas, which causes the lithium-ion battery to swell or even be damaged

Method used

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  • A kind of electrolyte of lithium ion battery and lithium ion battery

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Embodiment 1

[0033] This embodiment provides an electrolyte solution for a lithium ion battery, which includes the following components in mass percentage: 14% of lithium salt, 83% of solvent, and the balance of additives.

[0034] Wherein, the lithium salt is a mixture of lithium hexafluorophosphate and lithium dioxalate borate, and the mass percentages of the two in the electrolyte are 9% and 5% respectively.

[0035] The solvent is a mixture of ethylene carbonate, diethyl carbonate and ethyl methyl carbonate, and the mass percentages of these three in the electrolyte are 29%, 27% and 27% respectively.

[0036] The additive is a mixture of vinylene carbonate and ethylene carbonate, and the mass percentages of the two in the electrolyte are 1% and 2% respectively.

Embodiment 2

[0038]This embodiment provides an electrolyte solution for a lithium-ion battery, which includes the following components in mass percentage: 15% lithium salt, 81% solvent, and the balance of additives.

[0039] Wherein, the lithium salt is a mixture of lithium hexafluorophosphate and lithium dioxalate borate, and the mass percentages of the two in the electrolyte are 9.5% and 5.5% respectively.

[0040] The solvent is a mixture of ethylene carbonate, dimethyl carbonate and diethyl carbonate, and the mass percentages of these three in the electrolyte are 27%, 27% and 27% respectively.

[0041] The additive is a mixture of vinylene carbonate and ethylene carbonate, and the mass percentages of the two in the electrolyte are 2% and 2% respectively.

Embodiment 3

[0043] This embodiment provides an electrolyte solution for a lithium-ion battery, which includes the following components in mass percentage: 15% lithium salt, 82% solvent, and the balance of additives.

[0044] Wherein, the lithium salt is a mixture of lithium hexafluorophosphate and lithium dioxalate borate, and the mass percentages of the two in the electrolyte are 12% and 3% respectively.

[0045] The solvent is a mixture of ethylene carbonate, dimethyl carbonate and fluoroethylene carbonate, and the mass percentages of these three in the electrolyte are 29.8%, 26.1% and 26.1% respectively.

[0046] The additive is a mixture of ethylene carbonate and lithium difluoroborate dimethyl cyclomalonate, and the mass percentages of the two in the electrolytic solution are 1.5% and 1.5% respectively.

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Abstract

The invention discloses electrolyte of a lithium ion battery and the lithium ion battery, and belongs to the field of lithium ion batteries. The electrolyte comprises, by mass, 8-15% of lithium salt, 80-90% of solvent and the balance of additives, wherein the additives are selected from at least two of vinylene carbonate, vinylethylene carbonate, cyclo-propane diacid bis-fluoro lithium borate, dimethyl cyclo-propane diacid bis-fluoro lithium borate and bis-fluoro cyclo-propane diacid bis-fluoro lithium borate. According to the embodiment, the electrolyte has circulation stability at high temperature, and the capacity retention ratio is 74% after the lithium ion battery made from the electrolyte circulates 200 times at 60 DEG C.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte solution of a lithium ion battery and the lithium ion battery. Background technique [0002] With the introduction of regulations on energy saving and emission reduction of automobiles and the increasing support for electric vehicles, the electrification of automobile drive systems has become an inevitable trend. Due to its high energy density and good cycle performance, lithium-ion batteries are not only widely used in energy storage fields such as smartphones, laptops, and electric bicycles, but also will be the primary choice for electric vehicle drive systems. Lithium-ion batteries usually include casing, positive electrode, separator, negative electrode and electrolyte, and the electrolyte, as its core component, determines the performance of lithium-ion batteries. Therefore, the choice of electrolyte is very important. [0003] The electrolyte of the li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0037Y02E60/10
Inventor 海滨朱广燕赵志刚刘三兵
Owner WUHU LION AUTOMOTIVE TECH CO LTD
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