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Electrolyte for lithium battery as well as preparation method and application of electrolyte

An electrolyte and battery technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of lithium-ion battery gas leakage, improper type of organic solvent, thermal runaway, etc., to ensure long-term cycle performance and avoid thermal runaway , the effect of excellent performance

Pending Publication Date: 2022-07-05
ZHUHAI INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently used lithium-ion battery electrolytes are prone to generate carbon dioxide due to pyrolysis, causing the lithium-ion battery to gas and leak, thereby significantly reducing its cycle life, or the type of organic solvent used in the lithium-ion battery is not suitable, which can easily cause thermal runaway. resulting in serious safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of a lithium-ion battery electrolyte:

[0030] Lithium difluorophosphate was added to a mixed solvent of propylene glycol methyl ether acetate and ethylene carbonate in a mass ratio of 1:1, then imidazole bis(trifluoromethylsulfonyl)imide, dibenzoyl and glutaronitrile were added, and the mixture was mixed. Evenly, the electrolyte solution of lithium ion battery is obtained.

[0031] Among them, the mass of imidazole bis(trifluoromethylsulfonyl)imide accounts for 2% of the total mass of the battery electrolyte, the mass ratio of dibenzoyl and glutaronitrile is 1:1.15, and the total mass of the two accounts for 3% of the mass of the battery electrolyte. %; Lithium difluorophosphate concentration is 2mol / L.

Embodiment 2

[0033] Preparation of a lithium-ion battery electrolyte:

[0034] Lithium oxalate difluoroborate was added to the mixed solvent of propylene glycol methyl ether acetate and ethylene carbonate in a mass ratio of 1:1.2, then pyrrole bis(fluorosulfonyl)imide, dibenzoyl and glutaronitrile were added, and mixed well , that is, the electrolyte solution of lithium ion battery is obtained.

[0035] Among them, the mass of pyrrole bis(fluorosulfonyl)imide accounts for 3% of the total mass of the battery electrolyte, and the mass ratio of dibenzoyl and glutaronitrile is 1:1.25, and the total mass of the two accounts for 4% of the mass of the battery electrolyte; The concentration of lithium oxalate difluoroborate was 1 mol / L.

Embodiment 3

[0037] Preparation of a lithium-ion battery electrolyte:

[0038] Lithium hexafluorophosphate is added to an organic solvent with a mass ratio of propylene glycol methyl ether acetate to ethylene carbonate of 1:1, and then lithium piperidine tetrafluoroborate, dibenzoyl and glutaronitrile are added, and mixed evenly to obtain a lithium-ion battery electrolyte solution .

[0039] Among them, the mass of lithium piperidine tetrafluoroboron accounts for 3% of the total mass of the battery electrolyte, the mass ratio of dibenzoyl and glutaronitrile is 1:0.95, and the total mass of the two accounts for 5% of the mass of the battery electrolyte; the concentration of lithium hexafluorophosphate is 1mol / L.

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Abstract

The invention discloses an electrolyte for a lithium battery as well as a preparation method and application thereof, and relates to the technical field of lithium batteries. The electrolyte for the lithium battery comprises a lithium salt, an organic solvent, an ionic liquid, dibenzoyl and glutaronitrile, the lithium salt is lithium difluorophosphate, lithium hexafluorophosphate or lithium oxalyldifluoroborate, the organic solvent is a mixture of propylene glycol methyl ether acetate and ethylene carbonate, and the ionic liquid is a mixture of lithium difluorophosphate, lithium hexafluorophosphate or lithium oxalyldifluoroborate. The ionic liquid is imidazole bis (trifluoromethylsulfonyl) imine, pyrrole bis (fluorosulfonyl) imine, piperidine lithium tetrafluoroborate or imidazole lithium hexafluorophosphate, the mass of the ionic liquid accounts for 2-5% of the total mass of the battery electrolyte, and the total mass of dibenzoyl and glutaronitrile accounts for 2-5% of the mass of the battery electrolyte. According to the battery electrolyte, the excellent performance of the battery can be ensured, the problems of thermal runaway and thermal decomposition easily caused by repeated recycling of the battery are avoided, and the long-term recycling performance of the lithium ion battery is effectively ensured.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrolyte for lithium batteries and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are batteries that convert chemical energy into electrical energy through electrochemical redox reactions of chemical substances. Lithium-ion batteries have high energy density and cycle life, and have a wide range of applications in the energy field. With the rapid development of mobile technology equipment such as computers, mobile phones, etc. and the popularization of new energy vehicles, the performance requirements of lithium-ion batteries Higher and higher. [0003] The performance of lithium-ion batteries has a significant correlation with battery electrolytes. The type of raw materials and solvent types of battery electrolytes have a crucial impact on the performance of lithium-ion batteries. However, the currently used li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0569H01M10/0568H01M10/0525Y02E60/10
Inventor 徐林陈正件胡常青李宣刘凌雯杨岳
Owner ZHUHAI INST OF ADVANCED TECH