Cathode active material for all-solid-state battery, and all-solid-state battery cathode and all-solid-state battery, which comprise same
The core-shell cathode active material with a titanium concentration gradient addresses interfacial resistance issues in all-solid-state batteries, enhancing their lifespan and stability by reducing side reactions and maintaining performance.
Patent Information
- Application Number
- PCT/KR2025/004536
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-04-12
- Filing Date
- 2025-04-04
- Publication Date
- 2025-10-16
AI Technical Summary
All-solid-state batteries using sulfide-based solid electrolytes face high interfacial resistance due to the formation of a lithium-deficient layer and interfacial impurity layers at the interface between the positive electrode active material and the solid electrolyte, leading to capacity degradation and safety risks.
A cathode active material with a core-shell structure is developed, where the core includes a positive electrode active material and a lithium titanium compound, and the coating portion also contains a lithium titanium compound, with a concentration gradient of titanium decreasing from the surface to the center, reducing direct contact and side reactions.
This structure significantly reduces interfacial resistance and improves the long-term life characteristics of all-solid-state batteries by minimizing side reactions and maintaining performance over hundreds of cycles.