High-temperature-resistant high-entropy ceramic battery shell and preparation method thereof

By constructing a cerium-free high-entropy oxide ceramic coating on the surface of the battery casing, the problems of coating cracking and interface peeling at high temperatures were solved, achieving efficient thermal protection and interface anchoring, and enhancing the high-temperature resistance of the battery casing.

CN122403974APending Publication Date: 2026-07-17SHANGHAI PINGBOKAI NEW MATERIALS CO LTD +1
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Patent Information

Application Number
CN202610623401.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-08
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing high-entropy ceramic coatings face challenges in battery casing thermal protection, including coating cracking, interface peeling, and film formation processes, and cannot effectively resist high-temperature thermal shock during battery thermal runaway.

Method used

A single cubic fluorite structure was constructed by using a cerium-free high-entropy oxide ceramic coating. High-entropy ceramic powder was dispersed in an organic-inorganic hybrid cross-linking network, and interface anchoring was achieved through silicon-oxygen metal covalent bonds. Combined with nanoscale powder particle size distribution and multi-component ion co-doping, a dense barrier layer was formed.

Benefits of technology

It effectively inhibits phase transformation cracking and interface peeling of the coating at high temperatures, provides strong phonon scattering and chemical anchoring force, constructs a micron-level thermal barrier, and enhances the high-temperature resistance of the battery casing.

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Abstract

The application relates to a high-temperature-resistant high-entropy ceramic battery shell and a preparation method thereof. The battery shell comprises a battery shell base material and a high-entropy oxide ceramic coating attached to the surface. The coating comprises an organic-inorganic hybrid cross-linked network and a nano ceramic powder; the powder has a single cubic phase fluorite structure, and a general chemical formula is AB2O4, wherein a rare earth element is a positive trivalent element not containing cerium. The powder particle size distribution satisfies D50 / D90 < 2.5, and a coating and a base material interface form a covalent bond. During preparation, a nano slurry is obtained through high-temperature calcination and sand milling, a bonding system is constructed by combining a silane coupling agent and an inorganic sol, and a high-adhesion coating is generated in situ through coating and low-temperature curing. The application solves the thermal mismatch combination problem of high-entropy ceramics and a metal base material, and significantly improves the limit thermal protection performance of the battery shell under a transient working condition of more than 1600 DEG C.
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