Copolymers of perfluoroalkyl ether side chain polysiloxanes with polyethylene glycol, methods of making and use

By using a copolymer of polysiloxane with perfluoroalkyl ether side chain and polyethylene glycol, the problems of narrow electrochemical window and low ionic conductivity of polysiloxane solid electrolytes were solved, and a lithium metal battery electrolyte film with high ionic conductivity and wide electrochemical window was realized.

CN122127603APending Publication Date: 2026-06-02HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Filing Date
2026-05-06
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing polysiloxane solid electrolytes have a narrow electrochemical window, low ionic conductivity, and low lithium-ion transference number, which limits the operating voltage range and performance of lithium metal batteries.

Method used

A copolymer of polysiloxane containing perfluoroalkyl ether side chains and polyethylene glycol is used. The electrochemical window and ionic conductivity are improved by introducing fluorinated alkyl groups. The preparation method includes steps such as mixing, heating, distillation and ultraviolet curing.

Benefits of technology

The electrochemical window was widened to 4.76 V, the room temperature ionic conductivity was increased to 4.36 × 10⁻⁵ S·cm⁻¹, and the thermal stability and antioxidant properties of the electrolyte film were improved.

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Abstract

This invention relates to the field of polymer solid electrolyte technology, disclosing a copolymer of polysiloxane containing perfluoroalkyl ether side chains and polyethylene glycol, its preparation method, and its applications. The invention first synthesizes a polysiloxane containing perfluoroalkyl ether side chains by reacting a perfluoroalkyl vinyl ether with a side-hydrogen-containing silicone oil, and then copolymerizes it with polyethylene glycol diacrylate to obtain a copolymer. The copolymer is then mixed with a lithium salt and cured under in-situ ultraviolet light to obtain a polymer solid electrolyte. By introducing a perfluoroalkyl vinyl ether, the invention leverages the high electronegativity and strong electron-withdrawing ability of fluorine to enhance the antioxidant properties of polymer solid electrolytes and broaden the electrochemical window. The electrochemical window of the polymer electrolyte film of this invention reaches 4.76 V, and the ionic conductivity reaches 4.36 × 10⁻⁶. ‑5 S·cm ‑1 .
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