Solid-state electrolyte and preparation method and application thereof

By coating the surface of rigid ceramic particles with polymers to form a core-shell structure solid electrolyte, the safety hazards of liquid lithium-ion batteries and the efficiency and performance problems of dry and wet preparation methods have been solved, and the preparation of solid electrolytes with high strength and high conductivity has been achieved.

CN119965332BActive Publication Date: 2025-11-07HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Application Number
CN202510024862.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-07
Publication Date
2025-11-07
Estimated Expiration
2045-01-07

AI Technical Summary

Technical Problem

Existing liquid lithium-ion batteries pose safety risks. Solid electrolytes prepared by dry methods have low efficiency and are difficult to mass-produce, while electrolytes prepared by wet methods have binders that affect conductivity and have poor mechanical properties.

Method used

By coating the surface of rigid ceramic particles with polymer to form core-shell reinforced particles, mixing them with inorganic electrolyte powder, and heating and pressurizing them, a solid electrolyte with a three-dimensional network structure is formed, which enhances its mechanical properties and maintains its conductivity.

Benefits of technology

This improves the mechanical strength and conductivity of solid electrolytes, solving the safety and production efficiency problems of electrolytes in existing technologies.

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Abstract

The application belongs to the technical field of lithium batteries, and relates to a solid-state electrolyte, which comprises inorganic electrolyte powder, rigid ceramic particles and a polymer three-dimensional network structure, wherein the polymer three-dimensional network structure is coated on the surface of the rigid ceramic particles. After the polymer is coated on the surface of the rigid ceramic particles and mixed with the solid-state electrolyte and heated and pressurized, the polymer is transformed into a three-dimensional network structure, and the solid-state electrolyte is densified at the same time. The rigid ceramic particles play a stress conduction role. Further heating makes the low-molecular-weight polymer further polymerize, and the strength of the polymer three-dimensional network structure is enhanced, so that the mechanical strength of the solid-state electrolyte is improved, and the influence on the electrical conductivity is small.
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