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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of deteriorating negative electrode performance, internal short circuit, and limited effect, so as to improve high temperature performance and safety performance, increase thermodynamic reaction energy barrier, and reduce kinetics Effect

Inactive Publication Date: 2016-07-06
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of HF will cause metal dissolution in the positive electrode material, and the ferrous ions dissolved in the positive electrode will deposit on the negative electrode and deteriorate the performance of the negative electrode. attenuation, and may even cause an internal short circuit, posing a serious safety hazard
The existing improvement of battery high temperature and safety performance is mainly by adding high temperature film-forming agent, gas production inhibitor, and replacing part of LiPF to the electrolyte. 6 Lithium salt and other methods are used to improve, but the effect is limited

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

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Effect test

Embodiment 1

[0026] At room temperature, in a glove box filled with argon, ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) were mixed according to the mass ratio of 1:1:1, and 100% by mass was added thereto. content of 2% vinylene carbonate (VC) and 0.05mol / L of TAC, then add lithium salt lithium hexafluorophosphate LiPF 6 Dissolve to a concentration of 1.1mol / L, and prepare electrolyte B.

Embodiment 2

[0028] At room temperature, in a glove box filled with argon, ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) were mixed according to the mass ratio of 1:1:1, and 100% by mass was added thereto. The content is 2% vinylene carbonate (VC) and 0.1mol / L TAC, then add lithium salt lithium hexafluorophosphate LiPF 6 Dissolve to a concentration of 1.1mol / L, and prepare electrolyte C.

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Abstract

The invention is applicable to the field of the lithium ion battery, and provides a lithium ion battery electrolyte. The electrolyte comprises a lithium salt, an organic solvent and a functional additive, wherein the functional additive is TAC; and the concentration of the functional additive in the electrolyte is 0.01-0.1mol / L. The invention also provides a lithium ion battery, including the electrolyte. According to the lithium ion battery, the TAC is added in the electrolyte; a coordination compound formed by the TAC and the metal ions in the battery restrains metal ion deposition, so that the high temperature performance and the safety performance of the battery are obviously improved. In addition, the TAC is used as the functional additive, so that an obvious effect can be achieved by only requiring a small dosage.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the lithium ion battery electrolyte. Background technique [0002] Since the 1990s, the development of pure electric and hybrid vehicles as a new technology has received great attention from developed countries and regions such as the United States, Japan, and Europe, and has achieved some significant research results and progress. In 2004, my country has surpassed Germany to become the world's third largest automobile country. It is estimated that my country will leap to become the world's largest automobile country in the next 3-5 years. If no measures are taken, the ensuing energy problems, environmental problems, health problems and The traffic problem will be more severe. Therefore, continuous improvement of power lithium-ion battery and electric technology has important social and strategic significa...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 杨斌斌饶睦敏钱龙许辉
Owner OPTIMUM BATTERY CO LTD
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