In-situ Grown SnS2 Nanosheets on rGO as an Advanced Anode Material for Lithium and Sodium Ion Batteries

Abstract

SnS₂ nanosheets/reduced graphene oxide (rGO) composite was prepared by reflux condensation and hydrothermal methods. In this composite, SnS₂ nanosheets <i>in-situ</i> grew on the surface of rGO nanosheets. The SnS₂/rGO composite as anode material was investigated both in lithium ion battery (LIB) and sodium ion battery (SIB) systems. The capacity of SnS₂/rGO electrode in LIB achieved 514 mAh g^-1 at 1.2 A g^-1 after 300 cycles. Moreover, the SnS₂/rGO electrode in SIB delivered a discharge capacity of 645 mAh g^-1 at 0.05 A g^-1; after 100 cycles at 0.25 A g^-1, the capacity retention still keep 81.2% relative to the capacity of the 6th cycle. Due to the introduction of rGO in the composite, the charge-transfer resistance became much smaller. Compared with SnS₂/C electrode, SnS₂/rGO electrode had higher discharge capacity and much better cycling performance.