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<p>Conversion reactions have made LiF-metal oxide (MO) composites with attractive specific capacities compelling candidates for the next generation of lithium-ion battery cathode materials. However, it is necessary for the high charge voltage (&gt; 4.5&#xa0;V) to drive the redox reaction of MOs and break a strong ionic bond between Li<sup>+</sup> and F<sup>−</sup> upon charge. It is a crucial way for decrease in the charge voltage to lower the activation energy barrier of the redox process between LiF and MOs. A novel conversion cathode LiF-V<sub>2</sub>O<sub>3</sub> system is proposed in this study. Unlike most of the previously reported LiF-MOs systems, the LiF-V<sub>2</sub>O<sub>3</sub> system can work at the lower charge cut off voltage of 4.3&#xa0;V. It delivers a reversible specific capacity of 197 mAh g<sup>−1</sup> at C/20 rate in the voltage range of 2–4.3&#xa0;V. Cyclic voltammetry data suggest a dominant contribution of pseudocapacitance effect in the conversion reaction of the LiF-V<sub>2</sub>O<sub>3</sub> sample.</p>

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Preparation and electrochemical performance of LiF-V2O3 composite cathode for lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Liping Ning,
  • Zhixing Sui,
  • Anping Tang,
  • Ziqin Liang,
  • Hezhang Chen,
  • Haishen Song,
  • Guorong Xu

摘要

Conversion reactions have made LiF-metal oxide (MO) composites with attractive specific capacities compelling candidates for the next generation of lithium-ion battery cathode materials. However, it is necessary for the high charge voltage (> 4.5 V) to drive the redox reaction of MOs and break a strong ionic bond between Li+ and F− upon charge. It is a crucial way for decrease in the charge voltage to lower the activation energy barrier of the redox process between LiF and MOs. A novel conversion cathode LiF-V2O3 system is proposed in this study. Unlike most of the previously reported LiF-MOs systems, the LiF-V2O3 system can work at the lower charge cut off voltage of 4.3 V. It delivers a reversible specific capacity of 197 mAh g−1 at C/20 rate in the voltage range of 2–4.3 V. Cyclic voltammetry data suggest a dominant contribution of pseudocapacitance effect in the conversion reaction of the LiF-V2O3 sample.