Preparation method of lanthanum gradient doped core hollow lithium-rich manganese-based positive electrode material
By controlling the difference in solubility product between the dopant elements and nickel and manganese elements in the mother liquor, lanthanum gradient-doped lithium-rich manganese-based cathode materials were synthesized by segmentally adjusting the pH value. This constructed a composite structure with internal voids and a gradient doping of lanthanum from the inside out, solving the problem of uneven distribution of dopant elements inside the particles and achieving efficient doping and improved stability of the material.
Patent Information
- Application Number
- CN202610544757.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-23
- Publication Date
- 2026-07-17
AI Technical Summary
Existing doping methods for lithium-rich manganese-based cathode materials are difficult to precisely control the distribution of dopant elements within the particles, resulting in low utilization of dopant atoms, inability to effectively exert lattice control effects, and easy formation of electrochemically inert impurities, which increases interfacial impedance.
By controlling the difference in solubility product between the doping elements and nickel and manganese elements in the mother liquor, lanthanum gradient-doped lithium-rich manganese-based cathode materials are synthesized by segmented pH adjustment. A composite structure with internal voids and lanthanum gradient doping from the inside out is constructed. The difference in diffusion rate of metal atoms at the heterojunction is used to buffer the volume change of insertion/extraction and suppress microcracks.
It significantly improves the cycling performance and rate performance of the material, increases the utilization rate of doped atoms, inhibits the migration and irreversible phase transition of transition metal ions, and improves the structural stability and electrochemical performance of the material.
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Figure CN122403523A_ABST