In Situ Synthesis of Graphene Nanosheet/MoS2 Composite Electrodes and Their Electrochemical Performance for Lithium Secondary Cells

Graphene nanosheet (GNS)/Molybdenum disulfide (MoS2)-sulfur composites were prepared by an In Situ solution-phase synthesis method. The practical implementation of lithium sulfur battery has not been realized by low discharge capacity and fast capacity decay during cycling owing to dissolution of lithium polysulfide into the electrolyte. In this work, we found that the GNS/MoS2 composites could mitigate the polysulfide dissolution and enhance the cycling stability via the MoS2 interaction. Electrochemical performances of prepared composites were evaluated in lithium batteries by galvanostatic cycling and cyclic voltammetry. When applied as the cathode in lithium sulfur batteries, GNS/MoS2 composites exhibited a high reversible capacity of 1143.4 mAh g(-1) at the first cycle and maintain a satisfactory cyclability.