Research on Lithium Storage Performance of MoS2/rGO Composites

Graphical Compared with MoS 2 electrode, the MoS 2 /rGO electrodes have higher initial discharge capacity, first coulomb efficiency and lithium ionization diffusion coefficient, and lower internal resistance. It is concluded that most of the oxygen-containing functional groups on the surface of GO are removed, but the conjugated network of graphene is not fully restored. However, the results of EIS directly show that rGO can still provide good conductivity for MoS 2 . MoS 2 /reduced graphene oxide (MoS 2 -I, MoS 2 /rGO-II and MoS 2 /rGO-V) composites with the mass ratio of MoS 2 to GO is 1:1, 2:1 and 5:1, which were used as anode materials for lithium-ion batteries (LIBs). The electrochemical properties and structure were tested and characterized. In the first cycle charge and discharge, the initial discharge capacity of MoS 2 /rGO-II electrode is 821.8 mAh g −1 at 0.1 C, and the first coulomb efficiency is 92.09 %. The capacity attenuation of the second and third cycles is 65 mAh g −1 and 10.1 mAh g −1 , respectively. Compared to MoS 2 electrode, the attenuation of MoS 2 /rGO-II electrode is obviously improved at different rates of 0.1 C, 0.2 C and 0.5 C, so MoS 2 /rGO-II electrode shows excellent rate performance. Through the reaction mechanism analysis, it is concluded that most of the oxygen-containing functional groups on the surface of GO are removed, but the conjugated network of graphene is not fully restored, resulting in the loss of electrical conductivity. However, the results of EIS directly show that rGO can still provide good conductivity for MoS 2 . Therefore, MoS 2 /rGO composites have great potential as electrodes for LIBs and broad research and application prospects in the field of energy storage.