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High-performance lithium ion battery electrolyte, preparation method thereof and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of ion batteries, can solve problems affecting the safety performance of lithium-ion batteries

Active Publication Date: 2021-09-10
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, the lithium-ion battery electrolyte contains a large amount of organic solvents, which are easy to burn and affect the safety performance of lithium-ion batteries

Method used

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  • High-performance lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • High-performance lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • High-performance lithium ion battery electrolyte, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Lithium-ion battery electrolyte, including: additives, non-aqueous organic solvent, lithium salt; non-aqueous organic solvent is composed of ethylene carbonate and dimethyl carbonate with a mass ratio of 4:6; the lithium salt is LiPF 6 , its molar concentration in the electrolyte is 1.0mol / L, the additive is 5-cyano-2-bromothiophene, and its mass is 5% of the mass of the electrolyte.

[0031] The preparation of the electrolyte is carried out in an argon glove box (moisture6 Dissolve in the above-mentioned mixed organic solvent, then add 5-cyano-2-bromothiophene therein, and stir to obtain the electrolyte solution.

Embodiment 2

[0033] Lithium-ion battery electrolyte, including: additives, non-aqueous organic solvents, lithium salts; non-aqueous organic solvents are composed of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate with a mass ratio of 1:1:1; lithium salts are LiBF 4 , its molar concentration in the electrolyte is 1.0mol / L, the additive is 5-cyano-2-chlorothiophene, and its mass is 5% of the mass of the electrolyte.

[0034] The electrolyte solution was prepared according to the method in Example 1.

Embodiment 3

[0036] Lithium-ion battery electrolyte, including: additives, non-aqueous organic solvent, lithium salt; non-aqueous organic solvent is composed of ethylene carbonate, ethyl acetate and diethyl carbonate with a mass ratio of 1:1:1; the lithium salt is LiPF 6 , its molar concentration in the electrolyte is 1.0mol / L, the additive is 5-cyano-2-bromothiophene, and its quality is 3% of the electrolyte mass.

[0037] The electrolyte solution was prepared according to the method in Example 1.

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Abstract

The invention provides a high-performance lithium ion battery electrolyte. The high-performance lithium ion battery electrolyte comprises an organic solvent, a lithium salt and an additive, and the additive is 5-cyano-2-halogenated thiophene. The electrolyte containing the additiveof 5-cyano-2-halogenated thiophene provided by the invention has relatively low oxidation-reduction potential, and can form a protective film on the surfaces of positive and negative electrode materials to prevent metal ions in the positive electrode material from being dissolved out in the electrolyte; and meanwhile, the electrolyte can be prevented from continuously generating redox reaction on the surfaces of the positive electrode and the negative electrode, so that the high-voltage cycle performance of the lithium ion battery is improved. The electrolyte provided by the invention has a flame retardant effect, and the flame retardant property of the electrolyte can be improved, so that the safety performance of the lithium ion battery is improved. The invention also provides a preparation method of the high-performance lithium ion battery electrolyte and a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of ion batteries, in particular to a high-performance lithium-ion battery electrolyte, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have become one of the most important candidate power sources for electric vehicles due to their advantages such as high specific energy, long cycle life, and no memory effect. The development of electric vehicles can cope with the environmental pollution caused by the rapid development of the automobile industry and the rapid consumption of oil resources. The promotion and use of electric vehicles depends largely on its mileage, and the mileage largely depends on the capacity that the battery can provide. As a vehicle power, the battery directly affects the performance of the electric vehicle and becomes the key to its development. The existing lithium-ion battery technology still needs to be developed to meet th...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2220/20H01M2300/0025Y02E60/10
Inventor 薛旭金王永勤李云峰张小霞赵宏福叶家铭王建萍姬圆圆张铜奇吴建华
Owner DO FLUORIDE CHEM CO LTD
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