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Electrolyte additive for lithium ion battery

An electrolyte additive, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the cycle performance and safety performance of easy-to-decompose batteries, low conductivity is not conducive to battery cycling, poor stability of lithium hexafluorophosphate and other problems, Achieve the effect of improving charge-discharge efficiency and cycle life, improving safety performance, and inhibiting reaction

Inactive Publication Date: 2017-01-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used lithium hexafluorophosphate has relatively poor stability and is easy to decompose when exposed to water, which has a great impact on the cycle performance and safety performance of the battery.
The low conductivity of lithium tetrafluoroborate is not conducive to the cycle of batteries
So far, most of the ionic liquids used as additives for lithium-ion batteries have relatively single functions and relatively simple structures.
For example, ionic liquids are only added to the electrolyte as a safe and stable additive, or ionic liquids are added to the electrolyte as a film-forming additive, and ionic liquids are added to the electrolyte as a multifunctional additive.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] In a high-purity argon atmosphere glove box, mix ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) in a weight ratio of EC:EMC:DMC=1:1:1 , using lithium hexafluorophosphate as the lithium salt, preparing an electrolyte solution with a lithium salt concentration of 1mol / L, and finally adding 1% of 1-vinyl-3-aminoimidazole bistrifluoromethanesulfonic acid imide salt ionic liquid additive.

Embodiment 2

[0021] In a high-purity argon atmosphere glove box, mix ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) in a weight ratio of EC:EMC:DMC=1:1:1 , using lithium hexafluorophosphate as the lithium salt, preparing an electrolyte solution with a lithium salt concentration of 1mol / L, and finally adding 1% of 1-vinyl-3-acetamidoimidazole bistrifluoromethanesulfonate imide salt ionic liquid additive.

Embodiment 3

[0023] In a high-purity argon atmosphere glove box, mix ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) in a weight ratio of EC:EMC:DMC=1:1:1 , using lithium hexafluorophosphate as the lithium salt, preparing an electrolyte solution with a lithium salt concentration of 1mol / L, and finally adding 1% N-vinylaminopiperidine bistrifluoromethanesulfonate imide salt as an ionic liquid additive.

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PUM

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Abstract

The invention relates to an ionic liquid additive for a lithium ion battery. The ionic liquid additive has an alkali group and an unsaturated double-bond group at the same time, and has multifunctional effects of film-forming promotion, dehydrating, acid restraining, stabilizing and the like. 0.01-5% of the additive is added to the electrolyte for the lithium ion battery; formation of a negative electrode SEI film is promoted while the water content in the electrolyte can be controlled; and consequently, the cycle performance and the safety of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to an ionic liquid additive for lithium ion batteries with multifunctional functions of film formation, water removal and acid suppression and an electrolyte solution containing the additive, belonging to the field of lithium ion batteries. Background technique [0002] The emergence of new energy has alleviated the depletion of the world's fossil energy. Lithium-ion batteries have become one of the rapidly developing new energy sources due to the advantages of high energy density, high voltage, long life, no self-discharge, and environmental friendliness. Lithium-ion batteries have become the preferred power source in portable electronic products. With their own comprehensive advantages, they are used in the field of new energy vehicles and are expected to become one of the important means of large-scale energy storage. [0003] As an important part of lithium-ion batteries, electrolyte is known as the "blood" of lithium-ion bat...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 蔡迎军张锁江汪志华任天鹭陈仕谋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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