A novel nitrogen doping approach for enhanced cathode performance in graphene oxide-based lithium-ion batteries

In this study, nitrogen-doped graphene composited LiMnPO₄/C was synthesized via a hydrothermal-calcination method using cetyltrimethylammonium bromide as a surfactant and nitrogen source. By optimizing the synthesis parameters, uniform nitrogen-doped graphene oxide coating was achieved on LiMnPO₄ nanosheets, which effectively enhanced the material's electronic conductivity and lithium-ion diffusion kinetics. LiMnPO₄/C electrode material loaded with 2 wt% nitrogen-doped graphene oxide (NrGo@LMP/C) composite demonstrated superior electrochemical performance, delivering a high discharge capacity of 162.3 mAh·g⁻¹ at 0.1 C and maintaining 79.6 mAh·g⁻¹ at 5 C. Notably, the material exhibited excellent cycling stability with 95 % capacity retention after 200 cycles at 0.5 C. These improvements are attributed to the synergistic effects of the nitrogen-doped graphene network, which facilitates rapid electron transport, reduces interfacial charge transfer resistance, and stabilizes the electrode structure during cycling. This work highlights a promising strategy for overcoming the inherent kinetic limitations of polyanionic cathode materials in high-performance lithium-ion batteries.