Long-life power-type ternary composite doped and coated modified lithium manganate cathode material and preparation method thereof
By constructing a ternary composite doping system of magnesium, aluminum, and titanium, a transition region of titanium-aluminum composite oxide, and a lithium-containing phosphorus compound layer, the performance deficiencies of lithium manganese oxide cathode materials in terms of high temperature and cycle life were solved, achieving a synergistic improvement in high capacity, long cycle life, high temperature stability, and high rate performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIANGTAN LIJIN NEW MATERIALS CO LTD
- Filing Date
- 2026-04-21
- Publication Date
- 2026-07-17
AI Technical Summary
Existing lithium manganese oxide cathode materials have insufficient performance in terms of cycle life and high temperature conditions, especially with rapid capacity decay. Furthermore, the strategies of bulk doping and surface coating modification result in structural disconnect, making it difficult to synergistically improve long-cycle, high-temperature, and rate performance while maintaining high capacity.
A lithium manganese oxide matrix doped with magnesium, aluminum, and titanium was used, and a titanium-aluminum composite oxide transition region and a lithium-containing phosphorus compound layer were constructed on the surface. A continuous gradient structure was formed by introducing aluminum and titanium sources in stages. Combined with the sequential deposition of phosphoric acid and ammonium dihydrogen phosphate and the fixation of lithium hydroxide monohydrate, a stable protective layer was formed.
This study achieves the goal of reducing electrode polarization, slowing manganese dissolution, and suppressing interface degradation during high-temperature cycling of lithium manganese oxide cathode materials while maintaining high discharge specific capacity and initial charge-discharge efficiency, thereby improving the material's room temperature and high-temperature cycling stability and rate performance.
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