Negative electrode material for all-solid-state battery, and all-solid-state battery

By using a lithium alloy phase framework structure and a lithium-rich metal phase multiphase alloy anode material, the stability of all-solid-state batteries under different pressure ranges and the cycling problem under high current and high capacity conditions have been solved, achieving high energy density and long-term stability of the battery.

WO2026153085A1PCT designated stage Publication Date: 2026-07-23INSTITUTE OF PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
INSTITUTE OF PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2025-12-26
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

The negative electrode material of all-solid-state batteries exhibits high sensitivity within different stacking pressure ranges, leading to negative electrode deformation, battery short circuits, and reduced capacity utilization. It is unable to cycle stably under high current and high capacity conditions, and existing technologies struggle to balance low potential and wide pressure tolerance.

Method used

A multiphase alloy anode material with a lithium alloy phase skeleton structure and a lithium-rich metal phase is adopted. The volume change is mitigated by the skeleton structure formed by the lithium alloy phase, and the low potential and high capacity are ensured by the free lithium metal phase. Combined with the high Young's modulus, the mechanical strength is improved, and it can adapt to stable cycling over a wide pressure range.

Benefits of technology

It achieves stable operation of all-solid-state batteries within a pressure range of 0-100MPa, reduces volume change and interface deterioration of the negative electrode, improves the energy density and long-term stability of the battery, and is suitable for cycle performance under high current and high capacity conditions.

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Abstract

The present invention provides a negative electrode material for an all-solid-state battery, and an all-solid-state battery. The negative electrode material comprises a lithium alloy phase serving as a framework and a lithium metal phase that fills the framework, wherein the mass percentage content of the lithium metal phase is 60%-80%. The all-solid-state battery comprises a positive electrode, a solid-state electrolyte layer, and a negative electrode, wherein the negative electrode uses the negative electrode material. The negative electrode material for an all-solid-state battery of the present invention has a high Young's modulus; and when the negative electrode material is used as a negative electrode, changes in the volume of the all-solid-state battery are precisely controlled, thereby realizing stable cycling of the battery within a wide pressure range under high current and high capacity conditions.
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