The Study Of Molybdenum Sulfide-Flexible Carbon Base Anode Battery Material

Lithium ion battery and sodium ion battery is new members of green energy, who have many advantages. Layer transition metal sulfides(TMDs) has three molecular layer of X-M-X called sandwich structure, whose inside layer is a covalent bond, there are very weak van der Waals force between its layers, whose layer space is also big, all of these advantages provide convenience for inset of lithium ions or sodium ions,. As an excellent representative of transition metal sulfides, molybdenum sulfide has the obvious advantages, but its capacity easy fall off in the electrochemical performance test and conductivity is bad, these factors are a barrier which restrict its electrochemical performance improvement. Carbon material is a kind of important cathode material in the battery, through composite the carbon materials and molybdenum sulfide, which can make up the disadvantage of molybdenum sulfide and improve electrochemical performance. Based on carbon materials as growth substrate, this paper grow molybdenum sulfide on the surface carbon materials of by microwave hydrothermal method. This kind of layered compounds possess large specific surface area, we directly use this kind of composite material as the electrode materials and assemble into lithium ion batteries and sodium battery to study the electrochemical performance. We choose including carbon fiber cloth(CFC) and foam graphene(GF) two kinds carbon materials as substrate materials. The main research content is as follows:By chemical vapor deposition method(CVD), high quality graphene was prepared after adjusting the optimal parameter, after transfer processing we obtain self-assembly of foam graphene(GF), Carbon fiber cloth(CFC) has a cleaning process to remove impurities. Microwave hydrothermal method contribute to composite carbon materials and molybdenum sulfide, then through XRD and Raman characterization, we determine the phase structure etc.Through field emission scanning electron microscope(SEM) and transmission electron microscope(TEM) characterize the microstrure of composites.Finally, the composite materials directly use as electrode materials instead of the traditional slurry coating process, then assemble it into lithium ion batteries and sodium ion batteries, constant current charge and discharge test and other electrochemical test was proceeded to study its electrochemical properties, we also use the cyclic voltammetry test and alternating current impedance to study the dynamic process. The third chapter is the battery performance study of molybdenum sulfide –flexible carbon fiber base, the lithium electric and sodium electric properties of CFC:Mo S2=22 is the most prominent. The fourth chapter is the battery performance study of molybdenum sulfide –flexible graphene base, the lithium electric and sodium electric properties of GF:Mo S2=3 and GF:MoS2=1 is the best. Through comparing the two chapter we draw a conclusion that molybdenum sulfide-flexible graphene base electrode material performance have a more outstanding electrochemical properties.