Electrolyte, secondary battery, and electronic device

By combining organic phosphine oxide compounds and dinitrile amine salt compounds with lithium difluorophosphate, the problems of insufficient ion conductivity and fluidity of the electrolyte in secondary batteries are solved, and the battery's cycle performance and high-temperature storage performance are improved.

WO2025199688A1PCT designated stage Publication Date: 2025-10-02NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information

Application Number
PCT/CN2024/083598
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-03-25
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Existing electrolytes have insufficient ionic conductivity and fluidity in secondary batteries, resulting in poor cycle performance.

Method used

An organic phosphine oxide compound and/or a dinitrile amine salt compound is combined with lithium difluorophosphate to improve the solubility and stability of lithium difluorophosphate in the electrolyte through the complexation of phosphoryl bonds and cyano groups, promote the formation of CEI film and SEI film, and enhance the protection of the positive and negative electrodes.

Benefits of technology

The cycle performance and high-temperature storage performance of the secondary battery are improved, and the side reactions during the battery cycle are reduced.

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Abstract

Provided are an electrolyte, a secondary battery and an electronic device, belonging to the technical field of batteries. The electrolyte comprises lithium difluorophosphate and a first substance, the first substance comprising a first compound that has a structure represented by formula I and / or a second compound that has a structure represented by formula II. The coordination between an organic phosphine oxide compound and / or dicyandiamide salt compound and lithium difluorophosphate can promote formation of more stable CEI films and SEI films in secondary batteries, so as to have a relatively strong protection effect on positive electrodes and negative electrodes and to reduce side reactions in battery cycle processes, thus improving the cycle performance and high-temperature storage performance of the secondary batteries.
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Citation Information

Patent Citations

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  • Gel polymer electrolyte and electrochemical device comprising the same

    US20200168949A1