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<p>The manganese-iron-based mixed polyanionic cathode material has gradually garnered considerable attention due to its high energy density and notable operating voltage advantages for sodium-ion batteries (SIBs). However, the Jahn-Teller distortion caused by Mn<sup>3+</sup> significantly impairs the cyclic stability of this material. Herein, a structural modulation strategy involving Mg<sup>2+</sup> doping is employed. The electrochemically inert Mg<sup>2+</sup> forms stronger chemical bonds, adjusts lattice parameters, and suppresses Jahn-Teller distortion, thereby markedly enhancing the structural stability of the cathode material for SIBs. Moreover, Mg<sup>2+</sup> further enhances the diffusion kinetics by widening the sodium-ion diffusion channels. In addition, the construction of an <i>in-situ</i> three-dimensional conductive network of carbon nanotubes significantly improves the electronic conductivity. As a result, this material exhibits a discharge-specific capacity of 126 mAh g<sup>−1</sup> at 0.1 C, which is close to the theoretical capacity (129 mAh g<sup>−1</sup>), and maintains high-capacity cyclic stability (80% after 3000 cycles) at 0.5 C. Furthermore, the system delivers an impressively high energy density (401 Wh kg<sup>−1</sup>), a value that stands among the highest reported so far in mixed phosphate systems. Therefore, the novel manganese-iron-based mixed polyanionic cathode material developed in this work holds great potential for large-scale energy storage applications.</p>

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“Pinning effect” mitigating Jahn-Teller distortion of manganese-rich phosphate cathodes in sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Zihao Yang,
  • Dongzhu Liu,
  • Yongtao Ma,
  • Xuexia Song,
  • Jingjing Wang,
  • Yanyan Cao,
  • Zhaowen Chen,
  • Xuan Yang,
  • Jiangtao Wang,
  • Xiangyang Xie,
  • Wei Huang,
  • Yukun Xi,
  • Ningjing Hou,
  • Xiaoxue Wang,
  • Wenbin Li,
  • Xifei Li

摘要

The manganese-iron-based mixed polyanionic cathode material has gradually garnered considerable attention due to its high energy density and notable operating voltage advantages for sodium-ion batteries (SIBs). However, the Jahn-Teller distortion caused by Mn3+ significantly impairs the cyclic stability of this material. Herein, a structural modulation strategy involving Mg2+ doping is employed. The electrochemically inert Mg2+ forms stronger chemical bonds, adjusts lattice parameters, and suppresses Jahn-Teller distortion, thereby markedly enhancing the structural stability of the cathode material for SIBs. Moreover, Mg2+ further enhances the diffusion kinetics by widening the sodium-ion diffusion channels. In addition, the construction of an in-situ three-dimensional conductive network of carbon nanotubes significantly improves the electronic conductivity. As a result, this material exhibits a discharge-specific capacity of 126 mAh g−1 at 0.1 C, which is close to the theoretical capacity (129 mAh g−1), and maintains high-capacity cyclic stability (80% after 3000 cycles) at 0.5 C. Furthermore, the system delivers an impressively high energy density (401 Wh kg−1), a value that stands among the highest reported so far in mixed phosphate systems. Therefore, the novel manganese-iron-based mixed polyanionic cathode material developed in this work holds great potential for large-scale energy storage applications.