High-voltage stable electrolyte for lithium-ion battery

A lithium-ion battery and electrolyte technology, which is applied to the high-voltage stable ion battery electrolyte and the electrolyte field that is stable under high pressure, can solve the problems of easy oxidative decomposition, battery performance decline, poor stability, etc., to meet the needs of industrial production. requirements, improve high voltage performance, improve performance effect

Active Publication Date: 2016-03-30
南宁翌思达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects that existing lithium-ion battery electrolytes have poor stability under high voltage and are prone to oxidative decomposition, resulting in a decrease in battery performance, the purpose of the present invention is to provide a battery that has good chemical stability and can efficiently inhibit oxidative decomposition under high voltage. , and can effectively improve the cycle performance of lithium-ion batteries under high voltage and prolong the service life of lithium-ion battery electrolyte

Method used

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  • High-voltage stable electrolyte for lithium-ion battery
  • High-voltage stable electrolyte for lithium-ion battery
  • High-voltage stable electrolyte for lithium-ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] In a glove box filled with argon (moisture 6 , the concentration is 1.0mol / L to obtain a conventional electrolyte; then add (addition amount 0.5wt%) biphenyl-4,4'-dimethylsulfonic acid and (addition amount is 0.5 wt%) to the prepared conventional electrolyte solution wt%) dimethyl fluorosulfite to obtain a high-voltage electrolyte for lithium secondary batteries.

[0036]Preparation of lithium ion battery: place the obtained positive electrode sheet and negative electrode sheet in an oven to dry them at a certain temperature, and then move them into a glove box. Then put the processed positive electrode sheet, separator, and negative electrode sheet in order, pack it into a CR2025 button battery, and inject the above-mentioned prepared electrolyte.

Embodiment 2

[0038] In a glove box filled with argon (moisture 6 , the final concentration is 0.8mol / L, to obtain conventional electrolyte; then add (addition amount is 0.5wt%) biphenyl-4,4'-dihexylidene sulfonic acid and (addition amount is 0.5%) diethyl fluorosulfite to obtain a high-voltage electrolyte for lithium secondary batteries.

[0039] Preparation of lithium ion battery: place the obtained positive electrode sheet and negative electrode sheet in an oven to dry them at a certain temperature, and then move them into a glove box. Then put the processed positive electrode sheet, separator, and negative electrode sheet in order, pack it into a CR2025 button battery, and inject the above-mentioned prepared electrolyte.

Embodiment 3

[0041] In a glove box filled with argon (moisture 4 , the final concentration is 1.5mol / L, to obtain conventional electrolyte; then add (addition amount is 1.0wt%) biphenyl-4,4'-dimethylene butanesulfonic acid and ( The addition amount is 0.5wt%) fluoroethylene sulfite to obtain a high-voltage electrolyte solution for lithium secondary batteries.

[0042] Preparation of lithium ion battery: place the obtained positive electrode sheet and negative electrode sheet in an oven to dry them at a certain temperature, and then move them into a glove box. Then put the processed positive electrode sheet, separator, and negative electrode sheet in order, pack it into a CR2025 button battery, and inject the above-mentioned prepared electrolyte.

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Abstract

The invention discloses a high-voltage stable electrolyte for a lithium-ion battery. The electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises a symmetrical biphenyl compound containing double sulfonic groups and a fluoro-sulfite compound. According to the electrolyte, high-voltage stable and compact interfacial films are simultaneously formed on the surfaces of a positive electrode and a graphite negative electrode, so that oxidative decomposition of the electrolyte is suppressed; recycling of the lithium-ion battery in a high-voltage condition can be met; and the service lifetime of the electrolyte is prolonged.

Description

technical field [0001] The invention relates to a high-voltage stable ion battery electrolyte, in particular to an electrolyte stable under high pressure, and belongs to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have a series of advantages such as high working voltage, high energy and power density, long cycle life, small self-discharge, and environmental friendliness. They have become the most efficient energy storage devices and are widely used in mobile electronic devices. And it will be more widely developed in electric vehicles and hybrid vehicles. At present, the energy density of commercial lithium-ion batteries has reached 200Whkg -1 , but still cannot meet the needs of the electric vehicle market. Cathode material is one of the core parts of lithium-ion batteries, and improving the performance of cathode materials is the key to improving the performance of lithium-ion batteries. Simultaneously increasing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/20H01M2220/30H01M2300/0025Y02E60/10
Inventor 张治安洪波张娟史晓东赖延清李劼张凯
Owner 南宁翌思达新能源科技有限公司
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