PEO-based solid electrolyte material, positive pole piece, solid electrolyte membrane and all-solid-state battery

By introducing titanium tetrafluoride into PEO-based electrolyte to generate TiO2, the problems of low ion conductivity and unstable interface at room temperature of PEO-based batteries are solved, and efficient lithium ion migration and battery stability are achieved.

CN119695266APending Publication Date: 2025-03-25WENZHOU UNIV
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Patent Information

Application Number
CN202411870887.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The existing PEO-based solid electrolyte materials have low ion conductivity at room temperature, poor lithium migration number, and unstable electrolyte/electrode interface, resulting in the rapid growth and short-circuit risk of lithium dendrites, hindering the further development of PEO-based batteries.

Method used

By introducing titanium tetrafluoride (TiF4) additive into the polyethylene oxide (PEO) system, TiO2 is generated by using the strong coordination effect between Ti4+ and TFSI- to improve the amorphous properties and interface stability of the electrolyte.

Benefits of technology

It realizes a high ionic conductivity and stable solid electrolyte interface at room temperature, inhibits the formation of lithium dendrites, improves the rapid migration ability of lithium ions, and ensures the stable operation and safety of the battery.

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Abstract

The invention provides a PEO-based solid-state electrolyte material, a positive pole piece, a solid-state electrolyte membrane and an all-solid-state battery, a TiF4 additive is introduced into a polyethylene oxide (PEO) system, and TiO2 is generated by utilizing a strong coordination effect between Ti < 4 + > and TFSI <-> in a PEO-based solid-state electrolyte. On a negative electrode interface, the interaction between Li < + > and ether oxygen in a PEO chain segment is weakened due to the formation of TiO2, so that more Li < + > ions are released; and decomposition of TFSI-can be accelerated through a molecular synergistic strategy, and formation of SEI rich in LiF is promoted, so that formation of lithium dendrites is effectively inhibited, and rapid migration of Li + is accelerated. On a positive electrode interface, the decomposition of a PEO chain is effectively inhibited by the high oxidation resistance of TiO2, an organic-inorganic coexisting CEI interface is formed at the positive electrode interface, the rapid transmission of lithium ions is ensured, a certain mechanical strength is provided for a cured electrolyte membrane, and finally, the solid polymer electrolyte battery which can stably operate at room temperature is obtained.
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