Effect of Na plus in situ doping on LiFePO4/C cathode material for lithium-ion batteries

Li1-XNaXFePO4 (X = 0, 0.01 or 0.05) composite cathode materials were synthesized by the simple solvothermal method. SEM images showed that Na doping had little effect on the morphology of particles, which provided a guarantee for its excellent electrochemical performance. Charge/discharge data revealed that an appropriate amount of doped Na could improve electrochemical performance. Li0.99Na0.01FePO4 showed excellent rate capacity and cycle stability, i.e., an extremely high keep in the capacity of 86.7% after 500 cycles at 10C, due to its ac facet morphology, larger lattice parameters in a and c, the enhanced electronic conductivity and Li-ion diffusion processes.

Automated summary

In this study, Li1-XNaXFePO4 composite cathode materials were synthesized by a simple solvothermal method. The research found that an appropriate amount of sodium doping could improve electrochemical performance, with Li0.99Na0.01FePO4 demonstrating excellent rate capacity and cycle stability.