High‐performance Cu <sub>0.95</sub> V <sub>2</sub> O <sub>5</sub> nanoflowers as cathode materials for aqueous zinc‐ion batteries
Xin‐Yao Yu, Fang Hu, Zhiqiang Guo, Lei Liu, Guihong Song, Kai Zhu
Abstract
Exploring high‐performance cathode materials for aqueous zinc ion batteries (ZIBs) is still one of the critical issues. Copper vanadate compound has become a potential cathode material for ZIBs with a novel displacement reaction mechanism of reversible reduction/oxidation of Cu 2+ /Cu 0 . Herein, we reported Cu 0.95 V 2 O 5 nanoflowers prepared using a hydrothermal synthesis method as a capable cathode material for ZIBs. The Cu 0.95 V 2 O 5 nanoflowers exhibit high specific capacity of 405 mAh·g −1 at the current density of 100 mA·g −1 , benefiting from the displacement reaction mechanism and phase transformation mechanism from Cu 0.95 V 2 O 5 to the open and stable architecture Cu 0.4 V 2 O 5 and Zn 3 (OH) 2 V 2 O 7 ·2H 2 O phase. The cathode exhibits excellent rate performance with a high capacity of ~ 200 mAh·g −1 at 5 A·g −1 and outstanding cycle stability with a capacity retention of 92% after 1000 cycles. It is anticipated that the novel Cu 0.95 V 2 O 5 nanoflowers are promising cathode material in the application for zinc ion batteries.