N-doped graphene encapsulated MoS 2 nanosphere composite as a high-performance anode for lithium-ion batteries.

MoS 2 is widely used in lithium-ion batteries (LIBs) due to its high capacity (670 mAh g -1 ) and unique two-dimensional structure. However, the further application was limited of MoS 2 as anode materials suffer from its volume expansion and low conductivity. In this work, N-doped graphene encapsulated MoS 2 nanosphere composite (MoS 2 @NG) were prepared and its unique sandwich structure containing abundant mesopores and defects can efficiently enhance reaction kinetics. The MoS 2 @NG electrode shows a reversible capacity of 975.9 mAh g -1 at 0.1 A g -1 after 100 cycles, and a reversible capacity of 325.2 mAh g -1 is still maintained after 300 cycles at 5 A g -1 . In addition, the MoS 2 @NG electrode exhibites an excellent rate performance benefiting from the electrochemical properties dominated by capacitive behavior. This suggests that MoS 2 @NG composite can be used as potential anode materials for LIBs.