Graphene-Modified Porous NiO/C Composites as Anode Materials for Li-Ion Batteries

Graphene has excellent conductivity and can thus serve as an electrical conductivity network. In this study, graphene-modified core-shell NiO/C composites were successfully synthesized. The connections among NiO/C particles were enhanced by shock cooling the link of each porous NiO/C particle. SEM and TEM images were obtained, which showed that the resulting core-shell NiO/C composites were rolled in graphene and evenly distributed. As anode material for Li-ion batteries, the discharge capacity for the 100th cycle is maintained at 637.6 mAh g^-1. When the increase in current density increases was constant, the discharge capacity did not plummet, and the cycle was stable. When the current density increased to 800 mA g^-1 ad then decreased to 100 mA g^-1, the discharge capacity increased to 623.1 mAh g^-1, which reflects an outstanding rate performance.