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<p>P2-type Na<sub>0.67</sub>MnO<sub>2</sub> is a promising candidate for sodium-ion layered oxide cathodes. However, Jahn–Teller distortion leads to structural instability and sluggish Na<sup>+</sup> diffusion kinetics, which impede its further commercialization. Herein, a P2-Na<sub>0.67</sub>Mn<sub>0.83</sub>Ti<sub>0.085</sub>Mg<sub>0.085</sub>O<sub>2</sub> (NTMMO) cathode is obtained by moderate substitution of titanium/magnesium for the manganese sites. The inactive Ti/Mg co-substitution is able to suppress Jahn–Teller distortion and enlarge the interlayer spacing. As a result, the NTMMO cathode material, characterized by its stable crystal structure, exhibited enhanced reversible capacity and remarkable rate performance. The initial specific discharge capacity was recorded at 214.7&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup> at 0.1C, while remarkable discharge capacity of 96.5&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup> was achieved at 20C. Thus, Ti/Mg co-substitution emerges as an effective approach for improving the electrochemical properties of Na<sub>0.67</sub>MnO<sub>2</sub>.</p>

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High-Performance P2–Na0.67MnO2 Cathode Enabled by the Synergistic Effect of Mg/Ti Co-doping Strategy

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Jianyou Wang,
  • Zhiheng He,
  • Jiaxin Tian,
  • Huibo Fan,
  • Lei Wang,
  • Yi Wang,
  • Yang Liu,
  • Biao Liu,
  • Tailong Yang,
  • Minghua Gao,
  • Ling Kang,
  • Shouman Chen,
  • Yong Li

摘要

P2-type Na0.67MnO2 is a promising candidate for sodium-ion layered oxide cathodes. However, Jahn–Teller distortion leads to structural instability and sluggish Na+ diffusion kinetics, which impede its further commercialization. Herein, a P2-Na0.67Mn0.83Ti0.085Mg0.085O2 (NTMMO) cathode is obtained by moderate substitution of titanium/magnesium for the manganese sites. The inactive Ti/Mg co-substitution is able to suppress Jahn–Teller distortion and enlarge the interlayer spacing. As a result, the NTMMO cathode material, characterized by its stable crystal structure, exhibited enhanced reversible capacity and remarkable rate performance. The initial specific discharge capacity was recorded at 214.7 mA h g−1 at 0.1C, while remarkable discharge capacity of 96.5 mA h g−1 was achieved at 20C. Thus, Ti/Mg co-substitution emerges as an effective approach for improving the electrochemical properties of Na0.67MnO2.