Displacement Reaction Mechanism of CuV2O6 Nanowires Cathode for Rechargeable Aqueous Zinc Ion Batteries

Abstract

The development of high capacity, low cost, and high safety cathode materials for rechargeable aqueous zinc-ion batteries (ZIBs) is an ongoing challenge. Herein, CuV2O6 nanowires are prepared by a facile hydrothermal method to be used as a high- capacity cathode material for ZIBs. The sample displays an initial discharge capacity of 338 mAh g-1 at a current density of 100 mA g-1 and a capacity of 143 mAh g−1 remained at 5 A g-1 after 1200 cycles with retention of ~ 100% except for initial capacity decay. Systematic structural and elemental characterization confirms the reduction/oxidation of Cu2+/Cu0 is reversible during the electrochemical process. This work brings a new prospect of designing more cathode materials with a displacement reaction mechanism for Zn-ion batteries.