Quasi-solid-state polymer electrolyte membrane with double-sided stable electrode / electrolyte interface characteristic and preparation method and application of quasi-solid-state polymer electrolyte membrane

By preparing a quasi-solid polymer electrolyte membrane composed of cross-linked polymer and basic electrolyte, the problem of simultaneously satisfying the stability requirements of solid polymer electrolytes on both the positive and negative electrode sides was solved, improving the ionic conductivity and cycle performance of lithium-ion batteries, and achieving stable cycling over a wide voltage range and excellent rate performance.

CN120854672APending Publication Date: 2025-10-28YIBIN DONGCHI NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511010130.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-22
Publication Date
2025-10-28

AI Technical Summary

Technical Problem

Existing solid polymer electrolytes cannot simultaneously satisfy both oxidation and reduction stability on the positive and negative electrode sides, resulting in low ionic conductivity and a narrow voltage stability range in lithium-ion batteries at room temperature, which affects battery performance.

Method used

A quasi-solid polymer electrolyte membrane composed of a cross-linked polymer and a base electrolyte including lithium salt and plasticizer is prepared by a cross-linking polymerization reaction initiated by ultraviolet light, forming a membrane with a stable electrode/electrolyte interface on both sides, which enhances lithium-ion migration and battery performance.

Benefits of technology

It improves the room temperature ionic conductivity and cycle performance of lithium-ion batteries, suppresses the dissolution of positive electrode active materials, achieves stable cycling in the range of 2.8 to 4.3V, and enhances the rate performance of the battery.

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Abstract

The invention belongs to the technical field of polymer electrolyte, and particularly relates to a quasi-solid-state polymer electrolyte membrane with double-sided stable electrode / electrolyte interface characteristics and a preparation method and application of the quasi-solid-state polymer electrolyte membrane. The invention provides a quasi-solid polymer electrolyte membrane with double-sided stable electrode / electrolyte interface characteristics. The quasi-solid polymer electrolyte membrane comprises a cross-linked polymer and a basic electrolyte adsorbed in pores of the cross-linked polymer, the basic electrolyte comprises a lithium salt and a plasticizer; the structure of the cross-linked polymer is shown as a formula I. The quasi-solid polymer electrolyte membrane and a positive electrode and a negative electrode can have oxidation stability and reduction stability at the same time, a compact and stable contact interface can be formed by the quasi-solid polymer electrolyte membrane and the positive electrode and the negative electrode, and dissolution and escape of transition metal (Ni, Co and Mn) in a positive electrode active material can be effectively inhibited; and the room-temperature ionic conductivity and cycle performance (stable cycle at 2.8-4.3 V) of the lithium ion battery are improved.
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