Anode active material composition, and all-solid-state secondary battery containing the same

The introduction of metal elements on the surface of lithium titanate particles in the negative electrode active material composition addresses aggregation issues, resulting in improved battery performance by enhancing the solid-solid interface and forming a denser layer, thus increasing initial discharge capacity and charge rate characteristics.

JP2026113590APending Publication Date: 2026-07-07UBE CORPORATION
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
UBE CORPORATION
Filing Date
2026-04-01
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing all-solid-state secondary batteries using lithium titanate particles with small average particle sizes face issues with aggregation, leading to inadequate contact between the lithium titanate powder and the solid electrolyte, which affects battery characteristics.

Method used

A negative electrode active material composition is developed, where at least one metal element (Al, W, Ce, or Mo) is present on the surface of lithium titanate particles, forming a denser negative electrode layer with fewer voids and improving the solid-solid interface with the solid electrolyte.

Benefits of technology

This composition enhances the initial discharge capacity, initial efficiency, and charge rate characteristics of the all-solid-state secondary battery by ensuring better contact and denser layer formation.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2026113590000001
    Figure 2026113590000001
  • Figure 2026113590000002
    Figure 2026113590000002
  • Figure 2026113590000003
    Figure 2026113590000003
Patent Text Reader

Abstract

The present invention provides a negative electrode active material composition that forms a good solid-solid interface with a solid electrolyte regardless of the particle size of the lithium titanate powder, and furthermore, can form a denser negative electrode layer with fewer voids than conventional compositions. [Solution] Li4Ti5O 12 The present invention provides a negative electrode active material composition comprising lithium titanate powder, which is the main component of the composition, and an inorganic solid electrolyte having conductivity of metal ions belonging to Group 1 of the periodic table, characterized in that at least one metal element selected from Al, W, Ce, and Mo is present on the surface of the lithium titanate particles constituting the lithium titanate powder.
Need to check novelty before this filing date? Find Prior Art