发布时间：2022-07-05

文章标题：本课题组与中南大学冶金与环境学院赖延清/张治安教授课题组在钠离子电池正极研究领域合作发表1篇SCI论文。

内容：

论文题目：Stabilization of Multicationic Redox Chemistry in Polyanionic Cathode by Increasing Entropy

论文摘要：

Polyanionic structure has large compositional flexibility, which creates a growing interest in exploring the property limits of electrode materials of rechargeable batteries. However, multi-ions storage in the polyanionic electrodes often causes irreversible capacity loss and crystal phase evolution, especially under high-voltage operation, which remain important challenges for their processing and application. Herein, as a proof of concept, we show that the multi-Na ions storage in the polyanionic cathode can be enhanced and stabilized by increasing the entropy of the host. The resulting polyanionic Na_3.4Fe_0.4Mn_0.4V_0.4Cr_0.4Ti_0.4(PO₄)₃ cathode remains to process excellent capacity over 160 mA h g^-1 with a robust capacity retention at high voltage of 4.5 V (vs. Na/Na⁺). Exploring the underlying mechanism through operando characterizations, we demonstrate that a stable trigonal phase plays an intriguing role in stabilizing the multi-redox reactions of the high-entropy polyanionic cathode. These results reveal the effectiveness of high-entropy concept in expediting high-performance polyanionic cathodes discovery.

论文信息：Advanced Science, 2022, 2202082; DOI: 10.1002/advs.202202082