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<p>Among various sodium-ion cathode materials, O3-NaNi<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> is promising candidate for practical application due to its high specific capacity and low cost. However, severe high-voltage phase transition during electrochemical cycling leads to poor cycling stability, limiting their practical application. Herein, a Cu-doping strategy is applied to prepare NaCu<sub>1/10</sub>Ni<sub>7/30</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub>. It is found that the modified cathode exhibits suppressed phase transition and shows lowered volume strain (3.5% vs. 9.5% for the pristine NFM). The inhibited high-voltage phase transition improves the structural stability, thus enhancing the electrochemical performance. Consequently, within a voltage window of 2.0–4.2&#xa0;V at 1&#xa0;C, the Cu-doped cathode delivers an initial discharge specific capacity of 123.69 mAh g<sup>-1</sup> and retains 63.5% of its capacity after 150 cycles, significantly outperforming pristine NFM (37.8% retention). This improvement in cycling stability highlights the effectiveness of Cu doping in mitigating phase-transition-induced degradation. Overall, Cu doping effectively suppresses phase transitions and enhances structural stability, offering a promising strategy for developing high-performance Ni–Fe–Mn-based cathodes.</p>

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Inhibiting high-voltage phase transition of O3-NaNi1/3Fe1/3Mn1/3O2 via Cu doping for high performance sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Zhengjia Xu,
  • Xinyu Shi

摘要

Among various sodium-ion cathode materials, O3-NaNi1/3Fe1/3Mn1/3O2 is promising candidate for practical application due to its high specific capacity and low cost. However, severe high-voltage phase transition during electrochemical cycling leads to poor cycling stability, limiting their practical application. Herein, a Cu-doping strategy is applied to prepare NaCu1/10Ni7/30Fe1/3Mn1/3O2. It is found that the modified cathode exhibits suppressed phase transition and shows lowered volume strain (3.5% vs. 9.5% for the pristine NFM). The inhibited high-voltage phase transition improves the structural stability, thus enhancing the electrochemical performance. Consequently, within a voltage window of 2.0–4.2 V at 1 C, the Cu-doped cathode delivers an initial discharge specific capacity of 123.69 mAh g-1 and retains 63.5% of its capacity after 150 cycles, significantly outperforming pristine NFM (37.8% retention). This improvement in cycling stability highlights the effectiveness of Cu doping in mitigating phase-transition-induced degradation. Overall, Cu doping effectively suppresses phase transitions and enhances structural stability, offering a promising strategy for developing high-performance Ni–Fe–Mn-based cathodes.