Mn–Doped Hollow Na3V2O2(PO4)2F as a High Performance Cathode Material for Sodium Ion Batteries

Abstract Na 3 V 2 O 2 (PO 4 ) 2 F (marked as NVOPF) is a promising cathode material for sodium‐ion batteries owing to its high voltage and theoretical energy density, while the low electrical conductivity hinders its practical applications. Ion‐doping could effectively improve electronic conductivity and structural stability of these materials. In this study, Mn‐doping Na 3 V 2− x Mn x O 2 (PO 4 ) 2 F (0≤ x ≤0.15) hollow microspheres were successfully synthesized by hydrothermal method in the presence of H 2 O 2 . Among these obtained materials, NVMOPF‐0.050 exhibits the best electrochemical performance with initial discharge capacity of 118 mAh g −1 and 61 mAh g −1 at 0.1 C and 2 C as cathode material for sodium ion batteries. Excellent performance can be attributed to the hollow spherical architecture, and good structural stability.