A solid-state polymer electrolyte membrane and a preparation method thereof, and a lithium metal battery

By introducing trifluoroethylene and chlorofluoroethylene into polyvinylidene fluoride SPE, a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer was prepared, which solved the problems of low ionic conductivity and low lithium-ion transfer number of existing SPEs and improved the high-rate charge-discharge performance and cycle stability of lithium metal batteries.

CN116231062BActive Publication Date: 2026-06-26SHENZHEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHENZHEN UNIV
Filing Date
2023-02-16
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing solid polymer electrolytes have low ionic conductivity and lithium-ion transfer number at 25°C, which limits the cycle performance of lithium metal batteries at high charging speeds, especially under extreme fast charging conditions.

Method used

Trifluoroethylene and chlorofluoroethylene were introduced into the molecular chain of polyvinylidene fluoride (SPE) to prepare a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer as the polymer matrix. By controlling the molar content of each monomer and the drying process, the interchain distance in the crystal was increased, thereby improving the ion transport performance.

Benefits of technology

High ionic conductivity and lithium-ion transference number were achieved, improving the discharge specific capacity and cycle stability of lithium metal batteries under high-rate charge and discharge conditions.

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Abstract

The application provides a preparation method of a solid-state polymer electrolyte film, comprising the following steps: adding poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer and a lithium salt into a solvent, uniformly mixing to obtain a mixed solution, and drying the mixed solution to obtain the solid-state polymer electrolyte film. In the poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer, the molar content of trifluoroethylene is 25.4% to 29.4%, and the molar content of chlorotrifluoroethylene is 6% to 10%. The preparation method uses poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer as a polymer matrix, and combines the control of the molar content of each monomer to prepare a solid-state polymer electrolyte film with high ion conductivity and lithium ion transference number. The application also provides a solid-state polymer electrolyte film prepared by the above method and a lithium metal battery comprising the solid-state polymer electrolyte film.
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