Robust three-dimensional graphene skeleton encapsulated Na3V2O2(PO4)2F nanoparticles as a high-rate and long-life cathode of sodium-ion batteries

A robust three-dimensional graphene skeleton supported Na3V2O2(PO4)2F microsphere composite was firstly synthesized. The Na3V2O2(PO4)2F/rGO composite exhibits outstanding high-rate capability and excellent long-term cyclical stability as a cathode material for sodium-ion batteries.235