Scholarlink

<p>The layered oxide cathode materials of sodium-ion batteries have received extensive attention due to their high theoretical capacity and low production costs. However, the practical application of layered cathodes is limited by the poor structural reversibility. In this study, the O3-type NaNi<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> cathodes were coated with TiNb<sub>2</sub>O<sub>7</sub> by a simple solid-state sintering method. The TiNb<sub>2</sub>O<sub>7</sub> coating layer suppresses side reactions and enhances the surface stability of the cathode material, and the trace doping of Ti<sup>4+</sup> and Nb<sup>5+</sup> alleviates lattice strain and enhances the migration of Na<sup>+</sup>. As a result, the modified cathode material demonstrates a reversible specific capacity of 140.6 mAh g<sup>− 1</sup> at 1&#xa0;C, which is higher than that of pure phase material (112.3 mAh g<sup>− 1</sup>). The capacity retention of the modified sample was improved by 13.4% after 100 cycles. This effective modification strategy enhances the practicality of layered oxide cathodes in sodium-ion batteries.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancing the electrochemical performance of O3-type Ni/Fe/Mn based layered cathode materials with TiNb2O7 coating

  • 期刊论文

  • 发表日期：

    2025年11月28日

查看全文
  • Wang Zhang,
  • Qiaohao Wang,
  • Yu Zhou,
  • Can Wu,
  • Ding Wang,
  • Yunjian Liu

摘要

The layered oxide cathode materials of sodium-ion batteries have received extensive attention due to their high theoretical capacity and low production costs. However, the practical application of layered cathodes is limited by the poor structural reversibility. In this study, the O3-type NaNi1/3Fe1/3Mn1/3O2 cathodes were coated with TiNb2O7 by a simple solid-state sintering method. The TiNb2O7 coating layer suppresses side reactions and enhances the surface stability of the cathode material, and the trace doping of Ti4+ and Nb5+ alleviates lattice strain and enhances the migration of Na+. As a result, the modified cathode material demonstrates a reversible specific capacity of 140.6 mAh g− 1 at 1 C, which is higher than that of pure phase material (112.3 mAh g− 1). The capacity retention of the modified sample was improved by 13.4% after 100 cycles. This effective modification strategy enhances the practicality of layered oxide cathodes in sodium-ion batteries.