V2O5 Nanospheres with Mixed Vanadium Valences as High Electrochemically Active Aqueous Zinc-Ion Battery Cathode

Hollow V4+-V2O5 nanospheres are prepared by a novel and simple method using VOOH as the precursor. V4+-V2O5 with mixed vanadium valences is firstly constructed as an electrochemically active cathode for aqueous zinc-ion batteries. The V4+-V2O5 cathode exhibits a prominent cycling performance up to 1000 cycles and an excellent rate capability.