Porous V₂O₅ microspheres: a high-capacity cathode material for aqueous zinc-ion batteries

Porous V₂O₅ microspheres are synthesized via spray-drying and employed as the cathode material for aqueous zinc-ion batteries (ZIBs). The obtained porous V₂O₅ microspheres exhibit an ultrahigh reversible capacity and superior rate and cycling performances. In particular, a discharge capacity of 401 mA h g^-1 can be achieved at 100 mA g^-1. The specific energy density reaches 286 W h kg^-1, surpassing most reported V-based cathode materials. The super electrochemical performances demonstrate that the porous V₂O₅ microsphere is a promising cathode material for aqueous ZIBs.