Li-ion battery based on B, N-graphene prepared by ball milling

Wrinkled graphene prepared by the bubbling chemical vapor deposition method was ball milled to produce active materials for lithium-ion battery anode. By controlling milling parameters, the graphene with optimum electrode performance was obtained. After 2000 cycles at a current of 2000 mA g⁻¹, the reversible specific capacity can be maintained at 213.04 mAh g⁻¹, with a retention rate of 150.61 %. It was found that two lithium storage mechanisms coexist in this graphene material, and their capacitive control plays a major role, for example, accounting for 75.87 % contribution at a voltage scan rate of 0.8 mV s⁻¹. To further improve the electrode performance, B and N co-doped graphene was also prepared through ball milling. The results showed that, at the current of 2000 mA g⁻¹, the reversible specific capacity after 2000 cycles could reach 225.59 mAh g⁻¹, which was 5.9 % higher than that of the undoped one.