Preparation of SnS/reduced graphene oxide@Cu nanocomposite with high reversible lithium storage

Abstract

SnS/reduced graphene oxide@Cu nanocomposite has been fabricated via a two-step synthetic strategy. In the composite material, most of SnS nanoplates are embedded in reduced graphene oxide. Partial SnS nanoplates exposed on the surface of reduced graphene oxide, have been largely coated with Cu nanoparticles. As a result, the nanocomposite has demonstrated high reversible lithium storage. After 640 cycles at 100 mA g−1, the composite remains a reversible capacity of 710 mAh g−1. The results from the electrochemical impedance spectroscopy suggest that the introduction of Cu can reduce the transfer resistance of the electrode and the enhanced lithium storage properties can be attributed to the synergistic effect of SnS, reduced graphene oxide and Cu.