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

Na3V2O2(PO4)(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 Na3V2-xMnxO2(PO4)(2)F (0 <= x <= 0.15) hollow microspheres were successfully synthesized by hydrothermal method in the presence of H2O2. 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.

Automated summary

Na3V2O2(PO4)(2)F, as a promising cathode material for sodium-ion batteries, has high voltage and theoretical energy density but low electrical conductivity. Mn-doping, leading to the successful synthesis of NVMOPF-0.050, significantly improves the electrochemical performance of these materials in sodium ion batteries.