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Lithium ion battery electrolyte with high-temperature and low-temperature properties

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of low discharge efficiency and achieve the effects of promoting low-temperature performance, promoting performance, and improving low-temperature performance

Active Publication Date: 2013-03-27
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention provides an electrolyte solution with a wide operating temperature window and good discharge performance, which can not only solve the problem of low discharge efficiency at -40°C, but also meet the high temperature cycle requirements of 60°C

Method used

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  • Lithium ion battery electrolyte with high-temperature and low-temperature properties
  • Lithium ion battery electrolyte with high-temperature and low-temperature properties
  • Lithium ion battery electrolyte with high-temperature and low-temperature properties

Examples

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Embodiment 1

[0031]A lithium-ion battery electrolyte that takes into account both high and low temperature performance, which includes an organic solvent, lithium salt and additives, wherein the organic solvent includes linear carbonate dimethyl carbonate that accounts for 30% of the total mass of the electrolyte, accounting for 30% of the total mass of the electrolyte. The total mass of the electrolyte is 20% cyclic carbonate ethylene carbonate, the linear carboxylate methyl acetate that accounts for 20% of the total mass of the electrolyte and the cyclic carboxylate that accounts for 20% of the total mass of the electrolyte It is γ-butyrolactone; the organic solvent is mixed uniformly at low temperature according to the required mass ratio, and then lithium salt is added to the uniformly mixed organic solvent, firstly, 0.6mol / L lithium hexafluorophosphate is added and fully shaken until dissolved After complete addition of 0.5% of the total mass of the electrolyte, the auxiliary lithium s...

Embodiment 2

[0033] With embodiment 1, difference is that in described organic solvent, linear carbonate is ethyl methyl carbonate and diethyl carbonate, and cyclic carbonate is propylene carbonate and butylene carbonate, and linear carboxylate is ethyl acetate, Methyl propionate and ethyl propionate; The auxiliary lithium salt is lithium difluorooxalate borate and F12 (LiB 12 f 12 ); the multifunctional additive is the second multifunctional additive; the film-forming additive is vinyl vinylene carbonate and fluoroethylene carbonate; the high temperature additive is butenyl sulfite, propylene sulfate and 1, 4-Butane sultone.

Embodiment 3

[0035] With embodiment 1, difference is that linear carbonate is dimethyl carbonate and diethyl carbonate in described organic solvent, and cyclic carbonate is ethylene carbonate and butylene carbonate, and linear carboxylate is methyl butyrate and ethyl butyrate, the auxiliary lithium salt is lithium tetrafluoroborate and F12 (LiB 12 f 12 ); the multifunctional additive is the third multifunctional additive; the film-forming additive is vinyl vinylene carbonate and vinyl sulfite; the high temperature additive is 1,3-propane sultone, propylene sulfate and 1,4-butane sultone.

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Abstract

The invention relates to lithium ion battery electrolyte, and mainly relates to lithium ion battery electrolyte with high-temperature and low-temperature properties, which belongs to the field of a lithium ion battery. The lithium ion battery electrolyte with the high-temperature and low-temperature properties comprises organic solvents, lithium salt and additives, wherein the organic solvents comprise linear carbonic ester, cyclic carbonate, linear carboxylic acid ester and cyclic carboxylic acid ester; the additives comprise a high-temperature additive and a multifunctional additive which is expressed by a structural formula 1 and accounts for 0.5%-15% in the total mass of the electrolyte; and according to the structural formula 1 shown in the specification, R1 is one of H, F, CH2=CH and CH3-CH=CH, and R2 is one of H, F, CN and CH2=CH. The electrolyte provided by the invention has a wide working temperature window and a good discharging property, and can not only solve the problem of low discharging efficiency at a low temperature of -40 DEG C, but also meet the requirement on circulation at a high temperature of 60 DEG C.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte, mainly relates to a lithium-ion battery electrolyte with both high and low temperature performance, and belongs to the field of lithium-ion batteries. Background technique [0002] Since the commercial use of lithium-ion batteries in the 1990s, they have rapidly developed due to their advantages such as high specific energy, high battery voltage, wide operating temperature range, long storage life, no memory effect, small self-discharge rate, and fast charge and discharge. Developed, at present, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebook computers, digital cameras, etc., and are gradually used as power batteries in electric bicycles, model airplanes, and electric vehicles. During the use of lithium-ion batteries, it has always been the focus of research by battery scientists to take into account the performance at high and low temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569
CPCY02E60/12Y02E60/10
Inventor 林召强董晶刘朋朋胡博吕猛
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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