Composite Particle for All-Solid-State Battery Production Method

ChangeBridge: Patent Grants - Batteries (H01M)

Published March 31st, 2026

Detected March 31st, 2026

Summary

USPTO granted Toyota Jidosha Kabushiki Kaisha patent US12592386B2 for a method of producing composite particles used in all-solid-state batteries. The patent covers positive electrode active material particles with a phosphorus-based coating film having a glass-transition temperature of 300°C or less.

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What changed

USPTO granted patent US12592386B2 to Toyota covering composite particles for all-solid-state batteries and their production method. The invention comprises a positive electrode active material particle with a phosphorus-compound coating film where the glass-transition temperature does not exceed 300°C. The patent includes 13 claims and was filed as Application No. 18104631 on February 1, 2023.

No immediate compliance action is required as this is a patent grant rather than a regulatory requirement. R&D and engineering teams should review the technical specifications to assess potential licensing opportunities. Intellectual property professionals may conduct freedom-to-operate analyses to determine whether this patent affects existing product development plans.

Source document (simplified)

← USPTO Patent Grants

Method for producing composite particle, positive electrode, and all-solid-state battery, and composite particle, positive electrode, and all-solid-state battery

Grant US12592386B2 Kind: B2 Mar 31, 2026

Assignee

TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventors

Hideaki Watanabe, Masaru Kubota, Ryosuke Furuya

Abstract

A composite particle includes a positive electrode active material particle and a coating film. In a method for producing the composite particle, the coating film covers at least a part of a surface of the positive electrode active material particle, the coating film contains a phosphorus compound, and a glass-transition temperature of the coating film is 300° C. or less.