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<p>Cathode materials of high capacity and long cycling stability are of great importance for the development of Mg–Li hybrid ion batteries (MLIBs). Niobium pentoxide (Nb<sub>2</sub>O<sub>5</sub>) is a promising cathode material for MLIBs due to the fast charge/discharge ability and relatively high capacity. However, the poor electronic conductivity limits the application of Nb<sub>2</sub>O<sub>5</sub> in MLIBs. In this work, the Ti-doped Nb<sub>2</sub>O<sub>5</sub> cathode material was synthesized via a simple method by tetrabutyl titanate cladding and calcining. The results show that a mass of fine nanoparticles is formed on the surface of micron Nb<sub>2</sub>O<sub>5</sub> particles. The electrochemical results indicate that Ti-doping improves the special capacity and cycling stability of Nb<sub>2</sub>O<sub>5</sub>. In particular, the Ti-doped Nb<sub>2</sub>O<sub>5</sub> possesses a specific capacity of 220.5 mAh g<sup>−1</sup> and a retention of 63.3% at 50 mA g<sup>−1</sup> after 100 cycles, obviously higher than the undoped Nb<sub>2</sub>O<sub>5</sub> of 35.0%. The improved electrochemical performance of Ti-doped Nb<sub>2</sub>O<sub>5</sub> can be attributed to the newly formed nanoparticles and enhanced electronic conductivity by Ti-doping.</p>

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Ti-doped Nb2O5 as cathode for Mg–Li hybrid batteries

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Junliu Ye,
  • Jiaxin Wen,
  • Jingdong Yang,
  • JianBo Li,
  • Di zhao,
  • Shibo Zhou,
  • Wenqiang Lu

摘要

Cathode materials of high capacity and long cycling stability are of great importance for the development of Mg–Li hybrid ion batteries (MLIBs). Niobium pentoxide (Nb2O5) is a promising cathode material for MLIBs due to the fast charge/discharge ability and relatively high capacity. However, the poor electronic conductivity limits the application of Nb2O5 in MLIBs. In this work, the Ti-doped Nb2O5 cathode material was synthesized via a simple method by tetrabutyl titanate cladding and calcining. The results show that a mass of fine nanoparticles is formed on the surface of micron Nb2O5 particles. The electrochemical results indicate that Ti-doping improves the special capacity and cycling stability of Nb2O5. In particular, the Ti-doped Nb2O5 possesses a specific capacity of 220.5 mAh g−1 and a retention of 63.3% at 50 mA g−1 after 100 cycles, obviously higher than the undoped Nb2O5 of 35.0%. The improved electrochemical performance of Ti-doped Nb2O5 can be attributed to the newly formed nanoparticles and enhanced electronic conductivity by Ti-doping.