ZnWO₄ anode material preparation by sol-gel method and its electrochemical performance

ZnWO₄ materials were prepared by citrates sol-gel method. The effect of sintering temperature on preparation process of samples was studied. The thermo-decomposing process of the precursor was analyzed by TG/DSC; the crystal structure and morphology of samples were characterized by XRD and SEM, and the electrochemical performance was tested by continuous current charge-discharge, cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). The results showed that the materials prepared at 550℃ had well developed crystal structure and better electrochemical properties with the first discharge specific capacity of 446.29 mAh/g and the reversible specific capacity of 200.7 mAh/g after cycle 20 times, specific capacity decayed slowly, charge and discharge efficiency was also high, and it showed a good cycle performance.