Na ₃ V ₂ (PO ₄ ) ₃ coated by N-doped carbon from ionic liquid as cathode materials for high rate and long-life Na-ion batteries

at 80 C). Such a superior sodium storage performance derives from the nitrogen doping carbon coating, triggering amounts of extrinsical defects and active sites in the N-doped amorphous carbon layer, which highly accelerates Na-ion and electron transport. This approach is simple, facile and shows easy scale-up. It could be extended to other materials for energy storage.