LiFePO₄ with enhanced electrical conductivity via nitrogen-doped carbon coating layer

In this comprehensive study, the significant impact of nitrogen-doped carbon coating layer (NC) addition on enhancing the electrochemical performance of LiFePO₄ cathode materials was systematically investigated. The electrical conductivity and electron transfer pathways within the electrode structure were substantially enhanced by strategically introducing NC onto the LiFePO₄ surface through advanced coating techniques. Comprehensive experimental results demonstrated that the NC coating layer remarkably improved the overall electrochemical performance, exhibiting an impressive discharge capacity of 104.43 mAh/g after 100 cycles at 1C rate and maintaining an exceptional capacity retention of 105.0%, which indicates superior cycling stability. The differential capacity analysis (dQ/dV) revealed significantly sharper and more well-defined peaks after 100 cycles, clearly indicating more efficient and rapid lithium ion insertion and extraction processes within the electrode matrix. Most importantly, detailed electrochemical impedance spectroscopy (EIS) analysis showed a substantially reduced charge transfer resistance (Rct) value of 52.18 Ω compared to the conventional LFP/C sample, definitively confirming that the electrical conductivity and overall electrochemical kinetics of the nitrogen-doped carbon coating layer sample were significantly enhanced compared to the conventional carbon coating layer approach. These findings demonstrate the promising potential of nitrogen-doped carbon coating strategies for advanced lithium-ion battery applications.