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Lithium ion battery non-aqueous electrolyte without ethylene carbonate solvent and battery

A lithium-ion battery and ethylene carbonate technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor cycle performance at room temperature and other problems, and achieve the effects of improving electrochemical performance, reducing impedance, and good heat resistance

Inactive Publication Date: 2021-02-05
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is in order to overcome the deficiency of above-mentioned background technology, a kind of non-aqueous electrolyte solution of lithium ion battery that does not contain ethylene carbonate solvent is provided, and electrolyte solution of lithium ion battery described in the present invention is combined by organic additive and inorganic additive , and does not use ethylene carbonate as a solvent, which can effectively solve the problem of poor normal temperature cycle performance, high temperature performance, low temperature performance or rate performance of lithium-ion batteries, and improve the long-term cycle performance of lithium-ion batteries

Method used

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  • Lithium ion battery non-aqueous electrolyte without ethylene carbonate solvent and battery
  • Lithium ion battery non-aqueous electrolyte without ethylene carbonate solvent and battery
  • Lithium ion battery non-aqueous electrolyte without ethylene carbonate solvent and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Electrolyte preparation steps: In a glove box filled with argon, mix propylene carbonate, diethyl carbonate and ethyl methyl carbonate according to the mass ratio of PC:DEC:EMC=15:20:65, and then add to the mixed solution Slowly add lithium hexafluorophosphate of 14.0% by weight of the total weight of the electrolyte, lithium difluorophosphate of 1.0% of the total weight of the electrolyte, lithium difluorosulfonimide of 5.0% of the total weight of the electrolyte, and finally add 1.0% by weight of the total weight of the electrolyte based on Sulfur dioxide gas additive was stirred evenly to obtain the lithium-ion battery electrolyte of Example 1.

Embodiment 2-14

[0030]Embodiment 2-14 and comparative example 1-5

[0031] As shown in Table 1, in Examples 2-14 and Comparative Examples 1-5, except that the composition ratio of the components of the electrolyte solution is added as shown in Table 1, the others are the same as in Example 1.

[0032] Table 1 embodiment 1-14 and the composition ratio of each component of the electrolyte of comparative example 1-5

[0033]

[0034]

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a lithium ion battery non-aqueous electrolyte without an ethylene carbonate solvent and a lithium ion battery containing the electrolyte. The lithium ion battery non-aqueous electrolyte without the ethylene carbonate solvent comprises an electrolyte lithium salt, a non-aqueous organic solvent and a film-forming additive, wherein the film-forming additive comprises inorganic sulfide. The inorganic sulfide additive can be reduced on a negative electrode graphite interface prior to a solvent and other film-forming additives under the condition of a small addition amount to form an excellent lithium-conducting inorganic substance, and meanwhile, the electrolyte does not contain an ethylene carbonate solvent, so compared with a conventional electrolyte containing a carbonate solvent, the electrolyte has more excellent low-temperature performance, rate capability and safety.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a nonaqueous electrolyte solution for lithium ion batteries not containing ethylene carbonate solvent and a lithium ion battery containing the electrolyte solution. Background technique [0002] Due to the advantages of high operating voltage, high energy density, long life, wide operating temperature range and environmental friendliness, lithium-ion batteries are widely used in 3C digital products, electric tools, electric vehicles and other fields, especially in the field of electric vehicles, 2015 has experienced explosive growth over the years. [0003] Among the commercialized negative electrode materials of lithium-ion batteries, artificial graphite, natural graphite, and composite graphite are mainly used. Although silicon-based materials have a larger gram capacity, due to their excessive self-expansion during the lithium-deintercalation process, It will ca...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0569H01M10/0525H01M10/4235H01M2300/0028Y02E60/10
Inventor 潘立宁黄慧聪朱学全郭力
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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