Preparation and Characterization of Graphene-MoS2 Composite Anode Materials

To meet the high performances of lithium ion batteries, it is very important to develop novel anode materi- als with high electrochemical capacity to replace the current carbon based materials. Molybdenum disulfide is widely known as a potential anode material and graphene is an effective additive for achieving the electrochemical properties of MoS2. In this study, with the aid of mechanical milling, edge-opened graphite was designed to be exfoliated into graphene by layered MoS2 to form composite anode materials, Gr/MoS2. This method was applicable to prepare Gr-MoS2 composites in large scale. The composite anode samples were characterized by XRD, SEM, EDS, HRTEM, Raman spectra, electrochemical testing. The results showed that the graphite with large size disappeared and element carbon was uniformly distributed in the ball-milling treated composite. With increase of the mass ratio of MoS2 to edge-opened graphite, the content of graphene in the obtained composite increased, but with more defects existed in the structure. The optimized Gr-MoS2 composites displayed good charge/discharge character and the capacity still maintained at 450 mAh/g after 55 charge/discharge cycles at a current density of 1 A/g.