Toyota Patent for Electrode Active Material and Battery

ChangeBridge: Patent Apps - Batteries (H01M)

Published September 18th, 2025

Detected March 27th, 2026

Summary

The USPTO has published a patent application from Toyota Jidosha Kabushiki Kaisha for an electrode active material, electrode layer, and battery. The application, filed on September 18, 2025, aims to provide an electrode active material that suppresses volume changes in the electrode layer, particularly for Si-based active materials.

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What changed

This document is a notice of a patent application filed by Toyota Jidosha Kabushiki Kaisha with the USPTO. The application (US20260088287A1) concerns an electrode active material containing a Si-based active material, designed to suppress volume changes within the electrode layer of a battery. The filing date was September 18, 2025.

As this is a patent application, there are no immediate compliance obligations or deadlines for regulated entities. However, companies involved in battery manufacturing or materials science may wish to review the application for insights into potential future technological developments and intellectual property in the energy storage sector.

Source document (simplified)

← USPTO Patent Applications

ELECTRODE ACTIVE MATERIAL, ELECTRODE LAYER, AND BATTERY

Application US20260088287A1 Kind: A1 Mar 26, 2026

Assignee

TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventors

Jun YOSHIDA, Hirofumi NAKAMOTO, So YUBUCHI, Ryosuke FURUYA, Chi Kuen WONG, Kazushige NOMOTO

Abstract

A main object of the present disclosure is to provide an electrode active material capable of suppressing the volume change of the electrode layer. The present disclosure achieves the object by providing an electrode active material including a secondary particle that is an aggregation of a plurality of primary particle, wherein the primary particle is a Si-based active material containing a Si element, and a particle size D10 (μm) and a particle size D50 (μm) of the secondary particle satisfy the specified formula (1).