Potassium vanadates with stable structure and fast ion diffusion channel as cathode for rechargeable aqueous zinc-ion batteries

We develop a series of potassium vanadates (K2V8O21, K0.25V2O5, K2V6O16·1.57H2O and KV3O8) as cathodes for low-cost aqueous zinc-ion battery. K2V8O21 with stable structure and fast ion diffusion channel demonstrates excellent zinc storage capability.318