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

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of reducing the constant current charging ratio and capacity of the battery, consuming hydrofluoric acid, and increasing the internal resistance of the battery, so as to improve high-temperature cycle performance and high-temperature cycle Improved performance and improved gas problems

Active Publication Date: 2021-02-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of acid anhydride additives also significantly increases the internal resistance of the battery, reduces the constant current charging ratio and capacity of the battery, and is not conducive to the improvement of the energy density of the battery.
The silane additives can cooperate with hydrofluoric acid, consume hydrofluoric acid, and block the continuous occurrence of subsequent side reactions, so they have better functions of removing water and acid, thereby improving the cycle performance of the battery, but the silane additives There is no obvious improvement effect on the problem of flatulence of the battery at high temperature

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a glove box filled with argon, based on the total mass of the battery electrolyte, the mass fraction of 12.0% LiPF was weighed 6 Dissolved in an organic solvent with a mass fraction of 87%, wherein the organic solvent is a mixed solvent of ethylene carbonate: diethyl carbonate: ethyl methyl carbonate=3:2:5 (w / w / w), and then The film-forming additive ethylene carbonate with a mass fraction of 0.5% and the additive A with a mass fraction of 0.5% were added thereto, and the electrolyte solution 1 was obtained after stirring evenly.

Embodiment 2

[0030] In a glove box filled with argon, based on the total mass of the battery electrolyte, the mass fraction of 12.0% LiPF was weighed 6 Dissolved in an organic solvent with a mass fraction of 87%, wherein the organic solvent is a mixed solvent of ethylene carbonate: diethyl carbonate: ethyl methyl carbonate=3:2:5 (w / w / w), and then The film-forming additive ethylene carbonate with a mass fraction of 0.5% and the additive B with a mass fraction of 0.5% were added thereto, and the electrolyte solution 2 was obtained after stirring evenly.

Embodiment 3

[0032] In a glove box filled with argon, based on the total mass of the battery electrolyte, the mass fraction of 12.0% LiPF was weighed 6 Dissolved in an organic solvent with a mass fraction of 87%, wherein the organic solvent is a mixed solvent of ethylene carbonate: diethyl carbonate: ethyl methyl carbonate=3:2:5 (w / w / w), and then Add film-forming additive ethylene carbonate with a mass fraction of 0.5% and additive C with a mass fraction of 0.5% to it, and stir to obtain electrolyte 3.

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Abstract

The invention discloses a battery electrolyte, and also discloses a lithium-ion battery containing the electrolyte. By adding acid anhydride derivative additives to the battery electrolyte, the problem of flatulence of the battery can be improved. At the same time, the acid anhydride derivative The additive contains O, N, Si, F and other elements. When it is used as an electrolyte additive, it has good compatibility with positive and negative electrode materials, which can effectively inhibit battery flatulence and improve battery high-temperature cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a battery electrolyte, and also to a lithium ion battery containing the electrolyte. Background technique [0002] Since Sony commercialized lithium-ion batteries in 1991, they have been widely used in electronic products such as mobile phones, cameras and notebook computers due to their advantages of high energy density, long cycle life and low environmental pollution. With the rapid development of the field of new energy vehicles, people have put forward higher requirements for the safety performance and energy density of lithium-ion batteries. However, under high temperature and high pressure, the battery's flatulence and rapid degradation of cycle performance severely limit its wider use. . [0003] In order to solve the gas problem of batteries, acid anhydride additives are widely used. This is because the acid anhydride additive can neutralize the alkalinity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 刘娟娟俞金萍沈剑梁大宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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