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<p>P2-Na<sub>0.67</sub>Ni<sub>0.33</sub>Mn<sub>0.67</sub>O<sub>2</sub> is highly expected to serve as a hopeful cathode for sodium-ion batteries, owing to its remarkable energy density and operating voltage. However, the severe phase transition of P2-O2 at high cut-off voltage induces large volume variation, which deteriorates the structure and leads to fast capacity decay. Over the past years, ion doping has been identified as an efficient way to suppress the phase transition, and a lot of attempts show the positive impact. Regrettably, concurrently achieving high capacity and high stability is still difficult work. In this work, we confirm that high capacity and high stability can be realized by precise composition regulation. The designed P2-Na<sub>0.67</sub>Ni<sub>0.28</sub>Mg<sub>0.03</sub>-Fe<sub>0.04</sub>Mn<sub>0.55</sub>Ti<sub>0.1</sub>O<sub>2</sub> maintaining the high electrochemical active element shows well suppressed phase transition, which contributes to outstanding structural stability and fast charge transfer kinetics. As a result, it shows a high specific capacity of 143.5 mAh g<sup>−1</sup> at 0.1 C, and operates with a long lifespan of 1000 cycles. This work demonstrates a new idea for concurrently realizing high capacity and stable cathode material by rationally structure design.</p>

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Suppressing high-voltage phase transition of P2 type oxides by a precise composition tailoring strategy to realize high energy and stable sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Ji Shi,
  • Yichi Zhang,
  • Binglong Wan,
  • Chenchen He,
  • Zhengjia Xu,
  • Jie Xu,
  • Lianbo Ma,
  • Xingqiao Wu,
  • Bo Peng

摘要

P2-Na0.67Ni0.33Mn0.67O2 is highly expected to serve as a hopeful cathode for sodium-ion batteries, owing to its remarkable energy density and operating voltage. However, the severe phase transition of P2-O2 at high cut-off voltage induces large volume variation, which deteriorates the structure and leads to fast capacity decay. Over the past years, ion doping has been identified as an efficient way to suppress the phase transition, and a lot of attempts show the positive impact. Regrettably, concurrently achieving high capacity and high stability is still difficult work. In this work, we confirm that high capacity and high stability can be realized by precise composition regulation. The designed P2-Na0.67Ni0.28Mg0.03-Fe0.04Mn0.55Ti0.1O2 maintaining the high electrochemical active element shows well suppressed phase transition, which contributes to outstanding structural stability and fast charge transfer kinetics. As a result, it shows a high specific capacity of 143.5 mAh g−1 at 0.1 C, and operates with a long lifespan of 1000 cycles. This work demonstrates a new idea for concurrently realizing high capacity and stable cathode material by rationally structure design.