Nitrogen-doped hollow graphite granule as anode materials for high-performance lithium-ion batteries

Although various anode materials have been reported, graphite is still a commercial anode material for lithium-ion batteries. In this study, nitrogen-doped carbon-coating graphite anode material with hollow structure is designed and fabricated through a facile and scalable process. This hollow structure constituted of graphite flakelets with disordered orientation inside can promote the penetration of electrolyte and shorten path of Li+ diffusion. The uniform N-doped carbon coating layer of NHG@C can significantly limit the side reaction between the organic electrolyte and superfine graphite inside and keep the electrode structure stability during charge and discharge. The obtained NHG@C anode material exhibits excellent rate capability in different current densities and displays a high reversible capacity of 304 ​mAh g−1 at a current density of 1A g−1 after 500 cycles. The excellent properties indicate that such a graphite-based anode material has a good prospect in the practical application of LIBs.