Solid electrolyte sheet and preparation method and application thereof

By doping M elements in the oxide solid electrolyte and depositing a carbon layer on its surface and coating a carbon polymer layer, the solid-solid interface contact problem in solid-state batteries is solved, and lithium ion conductivity and interface conductivity are improved.

CN119725701AActive Publication Date: 2025-03-28YIBIN LIBODE NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202411941060.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-03-28
Estimated Expiration
2044-12-26

AI Technical Summary

Technical Problem

In the actual use of the oxide solid electrolyte Li7La3Zr2O12 in solid-state batteries, there is a problem of solid-solid interface contact, which leads to an increase in ion transfer impedance and local deformation of the electrode, affecting battery performance.

Method used

By mixing the oxide solid electrolyte with the first and second binder glue solution, grinding and pressing, a green ceramic sheet is obtained, and sintered twice to form the first solid electrolyte sheet body. Then a carbon layer is deposited on the surface thereof, and the slurry mixed with the carbon powder and the second binder glue solution is applied to the surface thereof, and dried to form a second solid electrolyte sheet body with a carbon layer.

Benefits of technology

This method can stabilize the phase structure of the material, improve the lithium ion conductivity, improve the solid-solid contact problem of solid electrolyte sheets, reduce the interface impedance, and improve the interface conductivity.

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Abstract

The invention discloses a solid electrolyte sheet and a preparation method and application thereof, and belongs to the technical field of battery materials. The preparation method of the solid electrolyte sheet comprises the following steps: mixing an oxide solid electrolyte and a first binder glue solution, grinding, pressing and sintering to obtain a first solid electrolyte sheet body; depositing a carbon layer on the surface of the first solid electrolyte sheet body, then coating slurry containing carbon powder, and drying; the molecular formula of the oxide solid electrolyte is MxLi7La3Zr2O12, x is more than 0 and less than or equal to 0.2, and M comprises at least one of Ta, Nb and Sb. The solid electrolyte sheet is doped with the M element, so that the lithium ion conductivity can be improved; through cooperation of deposition of the carbon layer and coating of the carbon-containing slurry, the solid-solid contact problem of the solid electrolyte sheet can be effectively improved, the electrolyte volume strain is relieved, the interface impedance is reduced, and the interface conductivity is improved.
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