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 short cycle life and low coulombic efficiency, and achieve the effects of long cycle life, high coulombic efficiency and reduced loss

Pending Publication Date: 2021-02-19
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide an electrolyte and a lithium-ion battery to solve the technical problems of low coulombic efficiency and short cycle life caused by the consumption of electrolyte in lithium-ion batteries in the prior art

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Electrolyte system:

[0038] Fully mix ethylene carbonate and diethyl carbonate at a volume ratio of 1:1 to obtain a mixed organic solvent; add LiTFSI to the mixed organic solvent; add lithium acetylacetonate to the above mixed solution to form an electrolyte. Wherein, the weight concentration of LiTFSI is 22%, the weight concentration of lithium acetylacetonate is 1%, and the weight ratio of lithium salt to lithium acetylacetonate is 22:1.

Embodiment 2

[0040] Electrolyte system:

[0041] Fully mix ethylene carbonate and diethyl carbonate at a volume ratio of 1:1 to obtain a mixed organic solvent; add LiTFSI to the mixed organic solvent; add lithium acetylacetonate to the above mixed solution to form an electrolyte. Wherein, the weight concentration of LiTFSI is 20%, the weight concentration of lithium acetylacetonate is 0.8%, and the weight ratio of lithium salt to lithium acetylacetonate is 25:1.

Embodiment 3

[0043] Electrolyte system:

[0044] Fully mix ethylene carbonate and diethyl carbonate at a volume ratio of 1:1 to obtain a mixed organic solvent; add LiTFSI to the mixed organic solvent; add lithium acetylacetonate to the above mixed solution to form an electrolyte. Wherein, the weight concentration of LiTFSI is 30%, the weight concentration of lithium acetylacetonate is 2%, and the weight ratio of lithium salt to lithium acetylacetonate is 15:1.

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Abstract

The invention provides an electrolyte and a lithium ion battery. The electrolyte comprises a lithium salt, lithium acetylacetonate and an organic solvent. The better solubility of the lithium salt inthe electrolyte in the organic solvent promotes the higher conductivity of the electrolyte, the SEI film formed by the lithium acetylacetonate is more stable, and the loss of the electrolyte and the electrode active substance is reduced. The synergistic effect of the three components promotes the cycle stability of the whole electrolyte system to be better, the battery capacity to be larger, the capacity retention ratio to be higher, the coulombic efficiency to be higher and the cycle life to be longer.

Description

technical field [0001] The invention relates to the related field of battery electrolyte, in particular, to an electrolyte and a lithium ion battery. Background technique [0002] With the rapid development of economy and industry, the shortage of primary energy and environmental pollution have become more and more serious. The development of new green and renewable energy has become the development direction of the chemical power supply field. Lithium-ion batteries have the advantages of high voltage, high energy density, short cycle life, small memory effect, and environmental protection, and have become the most promising energy storage batteries at present. At present, lithium-ion batteries have been widely used in electronic equipment, electric tools, new energy vehicles and other fields, and the application of lithium-ion batteries has penetrated into all aspects of people's lives. [0003] As the core part of the battery, the properties of the electrolyte seriously a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 赵雪玲孙克宁樊城李海军丁坤鹏
Owner YINLONG ENERGY CO LTD
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