Synthesis And Electrochemical Properties Of Molybdenum And Tungsten Based Anode Materials Of Lithium-ion Battery

In recent years,with the rapid development of the electric vehicle market,lithium-ion batteries have received extensive attention from researchers because of their good cycling performance,high output power and high energy density.Traditional carbon anode materials have low theoretical capacity thus cannot meet the requirements of power batteries.Therefore,research and development of anode materials with high theoretical capacity,low cost,and environmental friendliness have become research hotspots in recent years.In this study,MoS₂,MoS₂/C,CoMoO₄ and CoWO₄ anode materials were prepared by hydrothermal method and spray drying technique.The crystal structure,morphology and electrochemical properties of the as-synthesized materials were studied by XRD,SEM,EDS,galvanostatic charge-discharge testing,electrochemical impedance spectroscopy and cyclic voltammetry.The MoS₂ nanoflower and MoS₂/C composite materials were successfully prepared by hydrothermal method.The effect of carbon addition on the morphology and electrochemical performance of the products was studied.The results showed that the MoS₂/C nanosphere composites synthesized with 10%carbon exhibited the best electrochemical performance at a current density of 200 mA·g^-1.The CoMoO₄ Micron rods materials were successfully prepared by hydrothermal method,the influence of pH,temperature and time on morphology and electrochemical properties have been systemmatically studied.When the response system pH=2,heated at190?for 12 h,the Uniform rod-shaped CoMoO₄ samples have high first discharge capacity up to 1482 mAh·g^-1at a curren density of 200 mA·g^-1.CoMoO₄ and CoWO₄ anode materials were synthesized by spray drying technique,and the effects of calcination temperature on the morphology and electrochemical properties of the products were studied.As the electrode material,the initial discharge specific capacities of 1269 mAh·g^-1 and 941 mAh·g^-1 were obtained at a current density of200 mA·g^-1,respectively,and the stability was good after multiple cycles.