Solid-state electrolyte material and preparation method thereof, positive electrode sheet, solid-state electrolyte membrane, and all-solid-state battery

By coating the surface of the LLZO-based solid electrolyte with a polysiloxane modification layer, the problems of poor contact between the LLZO-based solid electrolyte and the positive electrode active material and easy reaction with air were solved, thus achieving low interfacial impedance and good cycle stability of the all-solid-state battery.

CN116487686BActive Publication Date: 2026-06-16SHANGHAI TAIRUI LITHIUM BATTERY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI TAIRUI LITHIUM BATTERY TECHNOLOGY CO LTD
Filing Date
2023-04-25
Publication Date
2026-06-16

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Abstract

The application discloses a kind of solid electrolyte material and its preparation method, positive pole piece, solid electrolyte film and full solid battery, it is related to solid battery field;Method comprises: lithium lanthanum zirconium oxygen base solid electrolyte is dispersed in first solvent, and electrolyte dispersion liquid is made;Acidic pH regulator is added to the electrolyte dispersion liquid, and the pH of the electrolyte dispersion liquid is adjusted to 7~8, and neutral dispersion liquid is obtained;Orthosilicate is added to the neutral dispersion liquid and mixed to obtain dispersion solution;During mixing process, polysiloxane is formed by the reaction of orthosilicate, and polysiloxane is coated on the surface of lithium lanthanum zirconium oxygen base solid electrolyte;The dispersion solution is subjected to electrolyte separation and drying treatment to obtain a solid electrolyte material.The application aims to improve the surface properties of lithium lanthanum zirconium oxygen base solid electrolyte, so that it can build good interface contact with other inorganic materials.
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