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Electrolyte additive

An electrolyte additive and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems affecting large-scale applications, the circulation of borate additives and poor high temperature stability, and improve the high-voltage cycle stability. , optimize the effect of compound additives, improve low temperature and rate performance

Pending Publication Date: 2022-07-08
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Some schemes try to introduce compounds containing -B and -C≡N bifunctional groups as additives in the electrolyte, but borate additives have poor circulation and high temperature stability, which affects large-scale applications

Method used

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Embodiment Construction

[0034] In order to facilitate understanding of the present invention, the present invention will be described more fully below, and preferred embodiments of the present invention will be given. However, it should be understood that these embodiments are only used for more detailed description, and should not be construed as limiting the present invention in any form, that is, it is not intended to limit the protection scope of the present invention.

[0035] The electrolyte additive provided by the present invention has the structure of formula I or formula II:

[0036]

[0037] Wherein, in formula I, at least one group in R1, R2, R3 contains a cyano group, and the groups without a cyano group are independently selected from substituted or unsubstituted alkyl, alkenyl, alkynyl or alkoxy;

[0038] In formula II, at least one of R7, R8 and R9 contains a cyano group, and the groups without cyano are independently selected from substituted or unsubstituted alkyl, alkenyl, alkyn...

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Abstract

The invention provides an electrolyte additive which has a structure as shown in a formula I or a formula II: in the formula I, at least one group in R1, R2 and R3 contains a cyano group, and the groups which do not contain the cyano group are respectively and independently selected from substituted or unsubstituted alkyl, alkenyl, alkynyl or alkoxy; in the formula II, at least one of R7, R8 and R9 contains a cyano group, and the groups which do not contain the cyano group are independently selected from substituted or unsubstituted alkyl, alkenyl, alkynyl, amino or alkoxy. According to the invention, the cycling stability, overcharge resistance and high-temperature storage performance of the battery under the condition of 4.4 V and above are effectively improved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to an electrolyte additive with bifunctional groups and a composite additive comprising the bifunctional electrolyte additive. Background technique [0002] Increasing the charging voltage of the battery is an important means to improve the energy density of the battery, which can effectively reduce the number of charging times of electric tools, mobile power supplies, etc., and improve the service life of the battery. The increase of the charging voltage means a challenge to the redox resistance of the electrolyte. Especially for the high voltage system above 4.4V, the commonly used carbonate system and carboxylate system will be oxidized, which is not conducive to the stable cycle of the battery. [0003] Some schemes try to add film-forming additives to the electrolyte, represented by fluorine-containing sulfonimide salt ionic liquids, to improve the electrical perform...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 盖建丽杨纪荣张振宇高田慧张文彦王彦艳
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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