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Electrolyte and lithium ion battery

An electrolyte and lithium salt technology, applied in the field of electrolyte and lithium ion batteries, can solve the problems of high activity of silicon particles and affect the cycle performance of lithium ion batteries, and achieve the effect of improving cycle performance

Active Publication Date: 2020-09-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-sized silicon particles are relatively active and easily react with impurities in the electrolyte, which still affects the cycle performance of lithium-ion batteries.

Method used

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  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery

Examples

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Embodiment 1

[0050] The present embodiment provides an electrolyte, which comprises the following components in percentages by weight based on the total weight of the electrolyte: 5% Li 2 B 12 f 12 , 6% LiPF 6 , 2% of tris(trimethylsilane) borate, 1% of 1,3,6-hexanetrinitrile, 2% of N,N-dimethyltrifluoroacetamide and the rest of organic solvent. Wherein, the organic solvent is ethylene carbonate (EC), propylene carbonate (PC) and diethyl carbonate (DEC) in a weight ratio of 2:1:7.

[0051] The preparation method of the electrolyte solution in this embodiment includes the following steps: in a dry argon atmosphere, firstly mix the organic solvents EC, PC and DEC according to the ratio of 2:1:7 by weight, and then add Lithium salt and additives are uniformly dissolved and ready to use.

Embodiment 2

[0053] The present embodiment provides an electrolyte, which comprises the following components in percentage by weight based on the total weight of the electrolyte: 8% Li 2 B 12 f 12 , 3% LiPF 6 , 2% of tris(trimethylsilane) borate, 1% of 1,3,6-hexanetrinitrile, 2% of N,N-dimethyltrifluoroacetamide and the rest of organic solvent, wherein , the organic solvent is EC, PC and DEC with a weight ratio of 2:1:7.

[0054] The preparation method of the electrolyte of this embodiment is basically the same as that of Embodiment 1.

Embodiment 3

[0056] The present embodiment provides an electrolyte, which comprises the following components in percentage by weight based on the total weight of the electrolyte: 2% Li 2 B 12 f 12 , 9% LiPF 6 , 2% of tris(trimethylsilane) borate, 1% of 1,3,6-hexanetrinitrile, 2% of N,N-dimethyltrifluoroacetamide and the rest of organic solvent, wherein , the organic solvent is EC, PC and DEC with a weight ratio of 2:1:7.

[0057] The preparation method of the electrolyte of this embodiment is basically the same as that of Embodiment 1.

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Abstract

The invention relates to an electrolyte and a lithium ion battery. The electrolyte comprises a lithium salt, an additive and an organic solvent, wherein the lithium salt comprises a boron cluster lithium salt and a conventional lithium salt according to a specific ratio, the additive comprises a nitrile compound, a silane compound and an amide compound of specific varieties and specific ratios. The cycle performance of the lithium ion battery prepared from the electrolyte is effectively improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] With the development of energy storage technology, the requirements for the energy density of lithium-ion batteries continue to increase, and silicon negative lithium-ion batteries have been rapidly developed. However, during the charging process, the silicon anode will undergo volume expansion and particle breakage, which will reduce the cycle life of lithium-ion batteries and prevent its wide application in the field of energy storage. For this reason, the silicon anode material is conventionally made into the shape of nanoparticles to suppress breakage to solve such problems. However, the nano-sized silicon particles are relatively active and easily react with impurities in the electrolyte, which still affects the cycle performance of lithium-ion batteries. Contents of the invention [0003] Based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M2300/0025Y02E60/10
Inventor 范长岭汤裕陈曦
Owner HUNAN UNIV