Vanadium-based Metal-Organic Framework as Cathode Materials for Aqueous Zinc-ion Batteries

Metal-organic frameworks (MOFs) have received much attention in the field of electrochemistry owing to their high specific surface area, adjustable aperture and tunable structure. A typical V-MOF was synthesized by using hydrothermal methods, where the effects of hydrothermal time on crystalline phase composition and microstructure of V-MOF and its performance for aqueous zinc-ion batteries (AZIBs) were explored. The resulting V-MOF material, a hollow nanorod with a valence of +4 for V after hydrothermal reaction for 36 h, has the highest electrochemical performance as an anode for AZIBs, with a specific capacity of 144.5 mAh·g⁻¹ at a current density of 100 mA·g⁻¹. At a current density of 1000 mA·g⁻¹, the Coulomb efficiency remained at 100% after 4000 charge/discharge cycles.