Due to their morphology, electrochemical stability, and function as a conducting carbon matrix, graphene nanosheets (GNS) have been studied for their potential roles in improving the performance of sulfur cathodes. In this study, a GNS/sulfur (GNS/S) composite was prepared using the infiltration method with organic solvent. The structure, morphology and crystallinity of the composites were examined using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The electrochemical properties were also characterized using cyclic voltammetry (CV). The CV data revealed that the GNS/S composites exhibited enhanced specific-current density and ~10% higher capacity, in comparison with the S-containing, activated-carbon samples. The composite electrode also showed better cycling performance for multiple charge/discharge cycles. The improvement in the capacity and cycling stability of the GNS/S composite electrode is probably related to the fact that the graphene in the composite improves conductivity and that the graphene is well dispersed in the composites.

LixFeMoO4Cl intercalates with x = 0, 0.20, 0.40, and 0.92 are synthesized by chemical lithiation of FeMoO4Cl single crystals with lithium iodide in MeCN at 20 °C under argon (1 week) or electrochemically at 30‐50 μA/cm2 using a two‐electrode cell of the type Li/(Li+, ClO4‐) + propylenecarbonate/FeMoO4Cl.

Graphene nanosheets (GNS)/sulfur were synthesized by heating a mixture of GNS and elemental sulfur. Single-walled carbon nanotubes (SWCNTs) were added into the composites as a modifier on GNS layers. The embedment of SWCNTs into composites can inhibit agglomeration of GNS and increase an effective surface area of the structural electroactive sites. The electrochemical property of the composites was investigated using cyclic voltammetry (CV), charge-discharge curves and cycle performance. The micro-structure and morphology of the composites were examined by scanning electron microscopy (SEM), transition electron microscopy (TEM). The GNS/SWCNT/sulfur composites exhibited the improved current density of redox reaction and the cycle stability for an application of rechargeable lithium-sulfur cells.