Research On Electrochemical Energy Storage Performance Of MoS₂

As a two-dimensional material similar to the structure of graphene, MoS2exhibit manyexcellent physical properties. Non carbon nanometer inorganic fullerene compounds,with itsframework resembling to that of the Graphene and the carbon nanotube,become ansignificant and new field of scientific research and can be widely used in the field of NanoElectronics, Nanotechnology, Catalysis, Energy and high performance composite materials.We researched on the storage performance of the Super capacitor and the lithium-ionbatteries,which was based on the fabrication of single layer of molybdenum sulfidematerial.The main work listed as follows:We studied the preparation of monolaye MoS2,and obstained the flaky MoS2with asingle or few layer by using intercalation exfoliating chemically.The sample obtained werecharacterized by X-ray diffraction (XRD), a scanning electron microscope (SEM), atransmission electron microscope (TEM), respectively.We prepared two groups of materials by High Energy Milling:(1) Molybdenumsulfide、(2) Molybdenum sulfide／Graphite. The result of x-ray diffraction (XRD) indicatedthat effect of milling process on the structure of the material was not obvious. However, thecharacteristic peak of MoS2reducted in the composite material, and its configurationchanged.Meanwhile, we observed the powder size diminished after ball milling,and appearedreunion phenomenon with time going on.We also found that the volume of material liftingeffect were not relied on Ball-milling treatment though the charge-discharge test.The electrodes were investigated by electrochemical tests and showed that MoS2hadgood electrochemical properties for supercapacitor with large specific capacitances in KOHelectrolyte.Electrochemistry tests proved that using electrophoretic deposition method for supercapacitor electrode gave a higher Specific capacity than that by Coating method.Morever, wealso carried out the comparative experiment in the condition of different deposition timebased on the result that Copper itself had a great influence on the electrode and discoveredthat deposited too much would not improve the overall performance of the device.