Synthesis of MoS2/RGO Composite in Supercritical Ethanol and Their Electrochemical Performance for Li-Ion Batteries

摘要

MoS2 features a layered structure, in which the atoms are covalently bonded to form two dimensional (2D) layers that are stacked together through weak van der Waals interactions. The weak interlayer interaction allows foreign ions or molecules to be introduced between the layers through intercalation. However, most of the MoS2 based electrodes still possess several issues such as fast capacity fading due to its intrinsically poor electrical/ionic conductivity and severe destruction caused by repetitive lithium insertion. Herein, two dimensional (2D) layered MoS2/RGO composites were synthesized through a sulfurization in H2S flow using MoO2/RGO composites as the precursors. MoO2/RGO composite was synthesized using a supercritical ethanol route at a very short reaction time of 10 min. The samples were systematically investigated using XRD, FE-SEM and Raman spectra. The diffraction peaks can be readily ascribed to the hexagonal MoS2 phase (JCPDS card No37-1492). The cycling performance of MoS2/RGO composite was higher than bulk MoS2 (116 mAh g-1) after 50 cycle. The MoS2/RGO composite delivered the large reversible capacity (896 mAh g-1) at 50 mA g-1 with negligible capacity fading.