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<p>O3-NaNi<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> (NNFM) is a promising cathode material for sodium-ion batteries (SIBs) due to its high theoretical capacity and appropriate operating voltage. However, the poor structure stability and slow Na<sup>+</sup> diffusion rate limit its application. The effect of Sr substitution on Sr<sub><i>x</i></sub>-NNFM (<i>x</i> = 0, 0.005, 0.010, and 0.015) was systematically investigated by XRD, SEM, TEM, XPS, ICP, and electrochemical techniques. The results show that Sr<sup>2+</sup> ions can be introduced into the transition metal layer and the structure stability, Na<sup>+</sup> ion transport rate, and electrochemical properties can be effectively enhanced. The Sr<sub>0.010</sub>-NNFM cathode material can display an initial discharge capacity of 160.49 mAh·g<sup>−1&#xa0;</sup>at 0.1C，and an initial capacity of 128.48 mAh g<sup>−1</sup> at 1C with a capacity retention of 71.16% after 300 cycles，and a good rate performance.</p>

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Sr doping improving electrochemical performance of O3-NaNi1/3Fe1/3Mn1/3O2 cathode material in sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Zongsheng Qiu,
  • Yuanyuan Lu,
  • Jiaxiu Sun,
  • Zhiqi Ren,
  • Danfeng Zhang,
  • Yuhang Wang,
  • Bin Huang,
  • Quanqi Chen,
  • Fei Sun,
  • Meng Qin,
  • Jianwen Yang,
  • Qiming Li

摘要

O3-NaNi1/3Fe1/3Mn1/3O2 (NNFM) is a promising cathode material for sodium-ion batteries (SIBs) due to its high theoretical capacity and appropriate operating voltage. However, the poor structure stability and slow Na+ diffusion rate limit its application. The effect of Sr substitution on Srx-NNFM (x = 0, 0.005, 0.010, and 0.015) was systematically investigated by XRD, SEM, TEM, XPS, ICP, and electrochemical techniques. The results show that Sr2+ ions can be introduced into the transition metal layer and the structure stability, Na+ ion transport rate, and electrochemical properties can be effectively enhanced. The Sr0.010-NNFM cathode material can display an initial discharge capacity of 160.49 mAh·g−1 at 0.1C，and an initial capacity of 128.48 mAh g−1 at 1C with a capacity retention of 71.16% after 300 cycles，and a good rate performance.