Few-layer SnS 2/graphene hybrid with exceptional electrochemical performance as lithium-ion battery anode

Abstract

Here we develop a facile process for preparing few-layer SnS 2/graphene (FL-SnS 2/G) hybrid by solution-phase method employing l-cysteine as a complexing, sulfide source and reducing agent. The FL-SnS 2/G hybrid is characterized by XRD, SEM and HRTEM. It is demonstrated that the few-layer SnS 2 with defects or disorder structure supports on graphene surface. Electrochemical tests show the FL-SnS 2/G hybrid exhibits an extraordinary capacity of up to 920 mAh g -1 with excellent cycling stability and high-rate capability. The significant improvement in the electrochemical performances is attributed to the robust composite structure and some synergistic interactions between few-layer SnS 2 and graphene. Electrochemical impedance spectra confirm that the incorporation of graphene considerably improved the electric conductivity and electron rapid transfer of the FL-SnS 2/G hybrid. Therefore, this new kind of FL-SnS 2/G hybrid can be used as a promising anode material for lithium ion batteries. © 2011 Elsevier B.V.