复合正极活性材料及其制备方法、锂离子电池和用电装置
By using a double-layer coating structure and a gradient concentration design, the interfacial stability problem of lithium-rich cathode materials under high pressure, high temperature and air exposure conditions has been solved, achieving high energy density, long life and high reliability lithium-ion battery performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- YUANSONG (NINGBO) TECHNOLOGY CO LTD
- Filing Date
- 2026-01-23
- Publication Date
- 2026-07-17
AI Technical Summary
Existing lithium-rich cathode materials have insufficient interfacial stability under high pressure, high temperature and air exposure conditions, and are prone to side reactions with electrolyte, leading to capacity decay and increased internal resistance.
The composite positive electrode active material adopts a double-layer coating structure and gradient concentration design. The core consists of a lithium-containing matrix coated with a first coating layer and a second coating layer. The first coating layer is composed of transition metal oxides such as molybdenum and vanadium, while the second coating layer is composed of more stable transition metal oxides such as niobium, tantalum, and tungsten. The concentration of transition metals gradually decreases from the outside to the inside. A robust interface is formed by precisely controlling the reaction temperature and sequence.
It significantly improves the interfacial stability of the material under high voltage, high temperature and air exposure conditions, suppresses lattice oxygen release and transition metal dissolution, extends battery cycle life, and maintains good lithium-ion migration ability and surface wettability.
Smart Images
Figure CN122417809A_ABST