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<p>P2-type layered oxide cathode materials possess favorable Na<sup>+</sup> diffusion pathway and high theoretical capacity for sodium-ion batteries, but still suffer from capacity degradation and inferior rate performance. Herein, a multicomponent P2-type cathode material Na<sub>0.67</sub>Ni<sub>0.2</sub>Fe<sub>0.2</sub>Mn<sub>0.5</sub>Mg<sub>0.01</sub>Cu<sub>0.025</sub>Al<sub>0.04</sub>Zn<sub>0.025</sub>O<sub>2</sub> was probed based on entropy engineering. The cathode delivers a high capacity of 132.09 mAh g<sup>−1</sup> at 0.5 C with 77% capacity retention after 100 cycles, along with a capability of 82.38 mAh g<sup>−1</sup> at 5 C. The structural analyses and electrochemical performance indicate that the improved performance is attributed to increased Na<sup>+</sup> diffusion kinetics and stabilized lattice oxygen, demonstrating the availability of entropy engineering in balancing structural integrity and electrochemical performance. This study proposes an efficient strategy for layered oxide cathodes to improve cycling stability and rate capacity applied in sodium-ion batteries.</p>

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Entropy engineering enhances cycling stability of P2-type layered oxide cathode for sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Haokun Li,
  • Cheng Wei,
  • Jingyuan Guo,
  • Zijin Cui,
  • Yuan Ha,
  • Ran Gu,
  • Xing Chen,
  • Chaoyi Zhou,
  • Zhimin Li

摘要

P2-type layered oxide cathode materials possess favorable Na+ diffusion pathway and high theoretical capacity for sodium-ion batteries, but still suffer from capacity degradation and inferior rate performance. Herein, a multicomponent P2-type cathode material Na0.67Ni0.2Fe0.2Mn0.5Mg0.01Cu0.025Al0.04Zn0.025O2 was probed based on entropy engineering. The cathode delivers a high capacity of 132.09 mAh g−1 at 0.5 C with 77% capacity retention after 100 cycles, along with a capability of 82.38 mAh g−1 at 5 C. The structural analyses and electrochemical performance indicate that the improved performance is attributed to increased Na+ diffusion kinetics and stabilized lattice oxygen, demonstrating the availability of entropy engineering in balancing structural integrity and electrochemical performance. This study proposes an efficient strategy for layered oxide cathodes to improve cycling stability and rate capacity applied in sodium-ion batteries.