Research on Lithium Storage Performance of MoS2/rGO Composites

• Published in: ChemistrySelect (Weinheim) 2024-08, Vol.9 (30), p.n/a
• Main Authors: Wang, Yuyang, Ge, Tao, Zhan, Xinju, Guo, Laigong, Liu, Song, Cheng, Qian, Deng, Yifeng
• Format: Article
• Language: English
• Subjects: Composite; Electrode; Lithium storage performance; MoS2; Reduced graphene oxide
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202401611

MoS2/reduced graphene oxide (MoS2‐I, MoS2/rGO‐II and MoS2/rGO‐V) composites with the mass ratio of MoS2 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 MoS2/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 MoS2 electrode, the attenuation of MoS2/rGO‐II electrode is obviously improved at different rates of 0.1 C, 0.2 C and 0.5 C, so MoS2/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 MoS2. Therefore, MoS2/rGO composites have great potential as electrodes for LIBs and broad research and application prospects in the field of energy storage. Compared with MoS2 electrode, the MoS2/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 MoS2.