Positive electrode composite active material comprising a lithium electrode material with a coating and a sulfide solid electrolyte
By heat-treating and high-pressure-treating the surface of the lithium nickel manganese/cobalt oxide positive electrode active material, a sulfur interlayer is formed, which solves the problem of poor contact between the positive electrode active material and the solid electrolyte in solid-state lithium batteries and improves electronic conductivity and electrochemical performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- UMICORE(BE)
- Filing Date
- 2024-12-10
- Publication Date
- 2026-07-10
AI Technical Summary
In solid-state lithium batteries, it is difficult to achieve close contact between the positive electrode active material and the solid electrolyte, resulting in high polarization and low utilization of active materials. Furthermore, in existing technologies, the reaction between the positive electrode active material and the solid electrolyte creates resistance, affecting the movement of Li ions.
By subjecting the surface layer of the lithium nickel manganese/cobalt oxide (NMC) positive electrode active material to heat treatment and/or high-pressure treatment, a sulfur interlayer is formed with the sulfide solid electrolyte, resulting in niobium (oxy) sulfide or zirconium (oxy) sulfide, thereby enhancing electronic conductivity and electrochemical performance.
This improved the contact stability and electronic conductivity between the positive electrode active material and the solid electrolyte, thereby enhancing the electrochemical performance of the battery.
Smart Images
Figure CN122374867A_ABST