Negative electrode active material, negative electrode and solid-state battery

By using a combination of spherical porous Si particles and sulfide solid electrolyte, the particle size distribution was controlled, solving the problem of Si-based active material expansion during charging, and achieving improved stability of the negative electrode active material layer and increased battery energy density.

CN122091507APending Publication Date: 2026-05-26TOYOTA JIDOSHA KK
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2025-11-24
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing Si-based active materials tend to expand during charging, which has resulted in the expansion problem of the negative electrode active material layer not being effectively suppressed.

Method used

Spherical porous Si particles are used as the negative electrode active material. The particle size distribution is controlled so that the proportion of particles below 0.5 μm is 3.8% to 18.8%, and particle size peaks exist in the ranges of 0.2 μm to 0.5 μm and 0.8 μm to 4.0 μm, respectively. These particles are combined with sulfide solid electrolyte to form a negative electrode active material layer.

Benefits of technology

It effectively suppresses the expansion of the negative electrode active material layer during charging, improving the stability of the negative electrode and the energy density of the battery.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122091507A_ABST
    Figure CN122091507A_ABST
Patent Text Reader

Abstract

This disclosure relates to a negative electrode active material, a negative electrode, and a solid-state battery. A negative electrode active material capable of suppressing expansion of the negative electrode active material layer during charging is provided. The negative electrode active material of this disclosure comprises spherical porous Si particles. In a volume-based particle size distribution measured by particle size distribution determination, the proportion of particles smaller than 0.5 μm to all particles is 3.8% to 18.8%, and there are one peak each in the first particle size range of 0.2 μm to 0.5 μm and the second particle size range of 0.8 μm to 4.0 μm.
Need to check novelty before this filing date? Find Prior Art