Role of the Mn substituent in Na 3 V 2 (PO 4 ) 3 for high-rate sodium storage

C/NVMP allowed high electrochemical performance supported by the replace V by the Mn promoted the easier electron transfer through lower band gap energy than Mn-free NVP and carbon coating increase the electric conductivity up to 2 × 10 −3 s cm −1 , which led to superior electrode performance.