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<p>Vanadium oxides are considered as promising cathode materials for aqueous Zn-ion batteries due to their open-layered frameworks, large interlayer spacing and the abundant valence states of vanadium. However, the instable frameworks and the strong electrostatic effect between the layers and Zn<sup>2+</sup> collectively hamper the further development of these materials. Herein, a layered hydrated vanadium oxide V<sub>10</sub>O<sub>24</sub>·0.93H<sub>2</sub>O is synthesized via a one-pot hydrothermal method, and is evaluated as a cathode material for aqueous rechargeable zinc-ion batteries (ZIBs). The incorporation of low content of 0.93 unit of structural water not only stabilizes the structure over long-term cycling, but also reduces the electrostatic effect. The pillar effect of low water content still favors the fast Zn<sup>2+</sup> storage of the electrode in the cycling process. Namely, the corresponding cathode displays impressive rate performance and long-term stability with a stable capacity of 139.5&#xa0;mAh&#xa0;g<sup>−1</sup> over 800 cycles at 5&#xa0;A&#xa0;g<sup>−1</sup> (with the capacity retention of 94%). The strategy of water molecule insertion (even fewer unit of water molecule) is regarded as a promising strategy to regulate vanadium-based cathode materials for Zn-ion batteries.</p>

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A V10O24·nH2O Layered Material with Low Crystal Water Content as a High-Performance Cathode for Aqueous Zinc-Ion Batteries

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • Gang Huang,
  • Yanfeng Liu,
  • Xiaolong Li,
  • Heng Zuo,
  • Fengying Chen,
  • Yuehong Song,
  • Jiahuan He

摘要

Vanadium oxides are considered as promising cathode materials for aqueous Zn-ion batteries due to their open-layered frameworks, large interlayer spacing and the abundant valence states of vanadium. However, the instable frameworks and the strong electrostatic effect between the layers and Zn2+ collectively hamper the further development of these materials. Herein, a layered hydrated vanadium oxide V10O24·0.93H2O is synthesized via a one-pot hydrothermal method, and is evaluated as a cathode material for aqueous rechargeable zinc-ion batteries (ZIBs). The incorporation of low content of 0.93 unit of structural water not only stabilizes the structure over long-term cycling, but also reduces the electrostatic effect. The pillar effect of low water content still favors the fast Zn2+ storage of the electrode in the cycling process. Namely, the corresponding cathode displays impressive rate performance and long-term stability with a stable capacity of 139.5 mAh g−1 over 800 cycles at 5 A g−1 (with the capacity retention of 94%). The strategy of water molecule insertion (even fewer unit of water molecule) is regarded as a promising strategy to regulate vanadium-based cathode materials for Zn-ion batteries.