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<p>P2-type Na<sub>2/3</sub>Ni<sub>1/3</sub>Mn<sub>2/3</sub>O<sub>2</sub> cathodes are promising candidate for Sodium-ion batteries. While the cycle stability should be enhanced for its commercial application. Given that lanthanum (La) is chemically inert and forms a strong La–O bond, it was doped into Na<sub>2/3</sub>Ni<sub>1/3</sub>Mn<sub>2/3</sub>O<sub>2</sub> to improve structural stability. A series of La-doped Na<sub>2/3</sub>Ni<sub>1/3</sub>Mn<sub>2/3</sub>O<sub>2</sub> (NNMO-La-<i>x</i>) were prepared and studied via XRD, HRTEM, XPS and electrochemical measurements. It can be observed that La<sup>3+</sup> ions are doped into the transition metal lattice when <i>x</i> ≤ 1.0, whereas excess La forms a LaMnO<sub>3</sub> phase. In addition, La doping enlarges the interlayer spacing and elevates the average Mn valence of the materials. As cathodes in SIBs, the optimal NNMO-La-1.0 achieves a capacity of 124.0&#xa0;mAh&#xa0;g<sup>−1</sup> at 0.1&#xa0;C and 82.2% capacity retention after 500 cycles at 1&#xa0;C. The results of the in-situ XRD indicate a solid-solution reaction for NNMO-La-1.0 during the charging/discharging process. This work shows a method to enhance the stability of the P2-type Na<sub>2/3</sub>Ni<sub>1/3</sub>Mn<sub>2/3</sub>O<sub>2</sub> cathodes.</p>

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Lanthanum-doped P2-type Na2/3Ni1/3Mn2/3O2 cathode with enhanced cycling stability and rate performance for sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Shumin Sun,
  • Yongqin Zhai,
  • Gencheng Deng,
  • Junbao Lei,
  • Peiyuan Wang

摘要

P2-type Na2/3Ni1/3Mn2/3O2 cathodes are promising candidate for Sodium-ion batteries. While the cycle stability should be enhanced for its commercial application. Given that lanthanum (La) is chemically inert and forms a strong La–O bond, it was doped into Na2/3Ni1/3Mn2/3O2 to improve structural stability. A series of La-doped Na2/3Ni1/3Mn2/3O2 (NNMO-La-x) were prepared and studied via XRD, HRTEM, XPS and electrochemical measurements. It can be observed that La3+ ions are doped into the transition metal lattice when x ≤ 1.0, whereas excess La forms a LaMnO3 phase. In addition, La doping enlarges the interlayer spacing and elevates the average Mn valence of the materials. As cathodes in SIBs, the optimal NNMO-La-1.0 achieves a capacity of 124.0 mAh g−1 at 0.1 C and 82.2% capacity retention after 500 cycles at 1 C. The results of the in-situ XRD indicate a solid-solution reaction for NNMO-La-1.0 during the charging/discharging process. This work shows a method to enhance the stability of the P2-type Na2/3Ni1/3Mn2/3O2 cathodes.