Lithium-rich manganese-based positive electrode material with gradient oxygen vacancies, preparation method and application
By introducing heterovalent element doping and atmosphere control into lithium-rich manganese-based cathode materials, a gradient oxygen vacancy structure was constructed, which solved the problems of voltage decay and cycle stability under high voltage, achieving high-efficiency battery performance and a simplified fabrication process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 深圳市速方新能源科技有限公司
- Filing Date
- 2026-06-03
- Publication Date
- 2026-07-17
AI Technical Summary
Existing lithium-rich manganese-based base oxide cathode materials are prone to lattice oxygen evolution and surface side reactions under high voltage, resulting in low coulombic efficiency and poor rate performance in the first cycle. Furthermore, irreversible phase transitions occur during cycling, leading to voltage decay and reduced energy density.
By introducing heterovalent element doping in the precursor stage and combining it with atmosphere control in the sintering cooling stage, a bulk oxygen vacancy and surface reconstruction layer are constructed to form a gradient oxygen vacancy structure. The bulk region maintains a stable layered structure, while the surface region forms an oxygen-deficient rock salt phase or defective spinel phase protective layer.
It significantly improves the first-cycle coulombic efficiency and cycle stability, suppresses voltage decay, improves rate performance, and simplifies the process flow, making it suitable for industrial production.
Smart Images
Figure CN122417867A_ABST