Electrolyte, electrochemical device, lithium ion secondary battery, and assembly

By using electrolytes containing fluoroacrylates and fluoroacrylamide compounds in lithium-ion secondary batteries, the problems of electrolyte decomposition and gas generation under high-temperature conditions are solved, thus improving the battery's storage and cycle characteristics.

CN117865841BActive Publication Date: 2026-08-07DAIKIN INDUSTRIES LTD
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Patent Information

Application Number
CN202311737331.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2018-01-30
Filing Date
2019-01-09
Publication Date
2026-08-07
Estimated Expiration
2039-01-09

AI Technical Summary

Technical Problem

Existing lithium-ion secondary batteries generate a large amount of gas in their electrolytes under high-temperature conditions and during repeated charge-discharge cycles, which affects battery characteristics.

Method used

An electrolyte containing specific fluorinated acrylates and fluorinated acrylamide compounds is used. By using compounds (1-1) and (1-2), the reduction and decomposition of the electrolyte on the negative electrode surface is suppressed, and the gas generation during high-temperature storage and charge-discharge cycles is reduced.

Benefits of technology

It improves the high-temperature storage and cycle characteristics of lithium-ion secondary batteries, reduces the amount of gas generated under high-temperature conditions and during repeated charge-discharge cycles, and enhances the overall performance of the battery.

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Abstract

The present application provides an electrolyte capable of improving the high-temperature storage characteristics and cycle characteristics of an electrochemical device. The electrolyte contains at least one compound represented by General Formula (1-1) (in the formula, R 101 is an alkyl group having 1 to 7 carbon atoms which can be fluorinated, etc., and can also contain O, etc. in the structure) and General Formula (1-2) (in the formula, R 102 and R 103 (i) are independently H, F, an alkyl group having 1 to 7 carbon atoms which can be fluorinated, etc., or (ii) are a hydrocarbon group which is linked to each other to form a 5- or 6-membered heterocycle together with the nitrogen atom, and can also contain O, etc. in the structure).
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