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<p>One prominent cathode material utilized in commercial sodium-ion batteries is the O3-type NaNi<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub>. The application of this material is hindered by multistage phase transitions and insufficient air stability. In this study, an innovative O3-type NaNi<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub>, derived from Ni-MOFs (referred to as M-NNMO), has been developed as a cathode material for sodium-ion batteries. The M-NNMO cathode exhibits a discharge specific capacity of 124 mAh·g<sup>−1</sup> at a rate of 0.1C within 2.0 to 4.0&#xa0;V. Furthermore, this material demonstrates an impressive capacity retention of 75% after undergoing 100 cycles. Complex phase transitions can be inhibited and ion diffusion rates can be increased simultaneously by Ni-MOFs through the enhancement of transition metal–oxygen bonding and the rise in Na layer gap, which are in charge of the remarkable performance improvement. Importantly, the enhanced stability of the M-NNMO transition metal layer based on the unique structural properties of Ni-MOFs in air stability tests. This work will provide theoretical guidance to design sodium-ion battery cathode materials with superior performance.</p> Graphical abstract <p></p>

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Enhanced performance of Ni-MOFs-based O3-type NaNi0.5Mn0.5O2 cathode material for sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Bo Yang,
  • Sheng-Kui Zhong,
  • Zhuo-Kui Zhong,
  • Jie-Qun Liu,
  • Shi-Wei Bai,
  • Qian-Hui Wu,
  • Zhi-Jian Liao,
  • Shi-He Shi,
  • Zhi-Yuan Zhang

摘要

One prominent cathode material utilized in commercial sodium-ion batteries is the O3-type NaNi0.5Mn0.5O2. The application of this material is hindered by multistage phase transitions and insufficient air stability. In this study, an innovative O3-type NaNi0.5Mn0.5O2, derived from Ni-MOFs (referred to as M-NNMO), has been developed as a cathode material for sodium-ion batteries. The M-NNMO cathode exhibits a discharge specific capacity of 124 mAh·g−1 at a rate of 0.1C within 2.0 to 4.0 V. Furthermore, this material demonstrates an impressive capacity retention of 75% after undergoing 100 cycles. Complex phase transitions can be inhibited and ion diffusion rates can be increased simultaneously by Ni-MOFs through the enhancement of transition metal–oxygen bonding and the rise in Na layer gap, which are in charge of the remarkable performance improvement. Importantly, the enhanced stability of the M-NNMO transition metal layer based on the unique structural properties of Ni-MOFs in air stability tests. This work will provide theoretical guidance to design sodium-ion battery cathode materials with superior performance.

Graphical abstract