Effect of heat treatment on the electrochemical performance of V2O5?nH2O as a cathode material for aqueous rechargeable zinc ion batteries

作者：Li, Jiaqi; Li, Yanwei^*; Yao, Jinhuan^*; Huang, Bin; Jiang, Jiqiong; Yang, Jianwen

来源：JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 2022, 115: 554-560.

DOI：10.1016/j.jiec.2022.09.001

• Zinc-ion batteries
• V2O5 center dot nH(2)O
• Cathode materials
• Heat treatment
• Zn2+ storage performance

The influence of heat treatment (100 degrees C, 150 degrees C, 200 degrees C, 300 degrees C, and 400 degrees C) on the structure and the zinc ion storage performance of V2O5 center dot nH(2)O is explored. The results show that the interlayer water content, interlayer distance, and V4+ content in V2O5 center dot nH(2)O can be regulated by heat treatment. Electrochemical characterization demonstrates that the as-prepared vanadium pentoxide without heat treatment shows rather poor cycling stability (only 56 m Ah g(-1) after 600 cycles at 0.5 A/g). After being heat treated in the temperature range of 100 to 200 degrees C, the zinc ion storage performance of vanadium pentoxide can be enhanced dramatically. Particularly, the vanadium pentoxide after being heat-treated at 150 degrees C exhibits the best cycling stability (179 mA h g(-1) after 600 cycles at 0.5 A/g), superior high-rate capability (117 mA h g(-1) at 3.0 A/g), and faster electrochemical reaction kinetics. The results reported in this work could provide clues for regulating and optimizing the electrochemical performance of vanadium pentoxide as a cathode material for ZIBs.

• 单位
  桂林理工大学