Effect of oxygen defects on electrochemical performance of V2O3 cathode in aqueous Zn-ion battery

The oxygen-defective V2O3 (Od-V2O3) was synthesized via a hydrothermal method followed by calcining treatment. Oxygen defects can provide permanent binding sites for some Zn2+, and accelerate the free diffusion of Zn2+ in V2O3. When used as cathode for aqueous Zn-ion batteries, the obtained Od-V2O3 delivers a reversible discharge capacity of 469.2 mAh/g at 0.1 A/g with a capacity retention of 90.1% and a distinguished rate capability. Even at a higher current density of 10 A/g, the glorious capacity of 248.3 mAh/g can be received after 1000 cycles. This paper opens up an avenue for the construction of advanced electrode materials.