一种钾基层状氧化物正极材料及其制备方法和应用
Potassium-based layered oxide cathode materials were prepared by solid-state sintering and electrochemical ion exchange methods, which solved the problems of lattice strain and volume change in potassium-ion battery cathode materials during the insertion/extraction process, achieving high specific capacity and cycle stability, and are suitable for potassium-ion battery cathodes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XI AN JIAOTONG UNIV
- Filing Date
- 2024-02-05
- Publication Date
- 2026-07-17
AI Technical Summary
Existing layered oxide cathode materials for potassium-ion batteries exhibit significant lattice strain and volume changes during potassium ion insertion/extraction, resulting in poor cycle performance and kinetic performance. Furthermore, they are difficult to synthesize through solid-state processes, leading to a shortage of cathode material varieties.
Sodium-based crystalline cathode materials were synthesized by solid-state sintering, and potassium was replaced by potassium through electrochemical ion exchange to prepare potassium-based crystalline oxide cathode materials suitable for potassium intercalation and deintercalation. The specific steps included assembling potassium half-cells and performing charge-discharge cycles to achieve ion exchange between Na and K.
The obtained potassium-based layered oxide cathode material has a specific capacity of 90.2 mA h/g at a current of 30 mA/g, and retains 89.6% of its capacity after 150 charge-discharge cycles. It exhibits good stability and rate performance, and its air stability is superior to that of materials formed by direct sintering.
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Figure CN117936751B_ABST