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A kind of electrolyte solution and lithium secondary battery

An electrolyte and lithium salt technology, applied in the field of electrolytes and lithium secondary batteries, can solve the problems of inability to suppress high-temperature storage gas production and the negative impact of high-temperature cycle performance of batteries, so as to improve high-temperature cycle performance and inhibit high-temperature storage gas production. , the effect of excellent high temperature performance

Active Publication Date: 2022-01-21
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] When thiophene is used as the heterocyclic substituent, the problem with this structure is that this structure cannot suppress high-temperature storage gas production, and has a negative impact on the high-temperature cycle performance of the battery

Method used

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  • A kind of electrolyte solution and lithium secondary battery
  • A kind of electrolyte solution and lithium secondary battery
  • A kind of electrolyte solution and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 The preparation method of high-voltage lithium-ion soft pack battery is as follows:

[0033] According to the capacity design of the battery, the capacity of the positive and negative electrode materials determines the coating area density. The positive electrode active material is a high-voltage lithium cobalt oxide material purchased from Xiamen Tungsten; the negative electrode active material is artificial graphite purchased from Shenzhen Beiterui; the separator is a PE material with a thickness of 20 μm purchased from Xingyuan. Coated ceramic diaphragm;

[0034] The positive electrode preparation step is: mix lithium cobaltate, conductive carbon black and binder polyvinylidene fluoride in a mass ratio of 96.8:2.0:1.2, and disperse them in N-methyl-2-pyrrolidone to obtain positive electrode slurry, Apply the positive electrode slurry evenly on both sides of the aluminum foil,

[0035] After drying, calendering and vacuum drying, the positive electrode ...

Embodiment 2～6

[0041] It is substantially the same as Example 1, except that the weight percent of the additive shown in Formula 1 is adjusted to 0.5%, 1%, 2%, 3% and 5%.

Embodiment 7

[0043] Substantially the same as Example 4, the difference is that the organic solvent in the electrolyte is adjusted to ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and propyl propionate (PP) by mass The ratio is 25:5:50:20 for mixing.

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Abstract

The invention relates to the technical field of lithium ion batteries, and provides an electrolytic solution, which includes a non-aqueous solvent, lithium salt and additives. The additive provided by the present invention has the structure shown in the following formula 1: by adding the additive in the high-voltage electrolyte, the performance of high-temperature cycle and high-temperature storage can be significantly improved. Meanwhile, the invention also provides a lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution and a lithium secondary battery. Background technique [0002] CN201710732609.1 discloses a fluoroalkylsulfonimide-based lithium-ion battery electrolyte additive whose structural formula is shown in formula I to promote the film formation of graphite carbon negative electrodes: [0003] [0004] Wherein, R1 is hydrogen, benzene ring, five-membered or six-membered heterocyclic group selected from furan, thiophene, pyrrole, thiazole, imidazole, pyridine, pyrazine, pyrimidine , Pyridazine, R2 and R3 are F atoms or fluoroalkyl groups in which 1 to 3 hydrogen atoms in methyl, ethyl, and propyl groups are substituted by F. The SEI film formed by the fluoroalkylsulfonimide additive is better than the SEI film formed by VC, which can better improve the cycle stability of the graphite carbon negative electrode, improve the safety performance of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 丁友停谢添高远鹏李帅龙玉朝琛周立马美朋
Owner GUANGZHOU TINCI MATERIALS TECH
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