Few-layer SnS2/graphene hybrid with exceptional electrochemical performance as lithium-ion battery anode

Here we develop a facile process for preparing few-layer SnS2/graphene (FL-SnS2/G) hybrid by solution-phase method employing l-cysteine as a complexing, sulfide source and reducing agent. The FL-SnS2/G hybrid is characterized by XRD, SEM and HRTEM. It is demonstrated that the few-layer SnS2 with defects or disorder structure supports on graphene surface. Electrochemical tests show the FL-SnS2/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 SnS2 and graphene. Electrochemical impedance spectra confirm that the incorporation of graphene considerably improved the electric conductivity and electron rapid transfer of the FL-SnS2/G hybrid. Therefore, this new kind of FL-SnS2/G hybrid can be used as a promising anode material for lithium ion batteries.

Graphical abstractThis few-layer SnS2/graphene hybrid synthesized by a facile solution-chemistry method displayed an impressively high Li+ storage capacity of 920 mAh g−1 which cycled well under a wide range of current densities.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We firstly reported a novel hybrid composed by graphene nanosheets and matched structural SnS2 nanosheets. ► This few-layer (FL) SnS2/graphene hybrid can be easily obtained by one-pot solution-chemical method. ► SnS2/graphene with many defect sites and few layered structure exhibited the extraordinarily high specific capacity and excellent cyclic stability.