Controlled graphene interfacial carbon nitride preparation for carbon negative electrodes of lithium-ion batteries

Graphitic carbon nitride (g-C3N4) is characterized by easy synthesis, high porosity and high nitrogen doping level. It has good application prospects as an negative electrode material for metal-ion batteries. However, graphitic carbon nitride (g-C3N4) cannot be directly used as negative electrode material (NEMs) for lithium-ion batteries due to poor electrical conductivity and poor cycling performance. To solve this problem, in this paper, g-C3N4 is synthesized on the surface of reduced graphene oxide by in situ synthesis method. The prepared rGO-g-C3N4 composites have high surface capacitance process occupancy due to the presence of a large amount of pyridinic-N and pyrrolic-N, and various defects and pores generated during the synthesis process provide a large lithium-ion mobility rate for the rGO-g-C3N4 composites. The rGO-g-C3N4 composites have excellent electrochemical properties and excellent lithium storage performance, the capacity of 1 A/g after cycling 300 laps to maintain a high lithium storage capacity of 708.6 mAh/g, and is still in the rising state, even if the current density of 15 A/g under the cycle of 10,000 laps, the highest lithium storage capacity of up to can still be up to 423.6 mAh/g, and stabilized in the 306.8 mAh/g. This work provides a new idea for the preparation of new negative electrode materials with low cost and high capacity.