溶胶-凝胶法制备ZnWO4负极材料及其电化学性能研究
ZnWO4 anode material preparation by sol-gel method and its electrochemical performance
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摘要: 采用柠檬酸溶胶-凝胶法制备了ZnWO4材料,考察了焙烧温度对制备过程的影响.利用TG/DSC分析了ZnWO4前驱体的分解过程;通过XRD和SEM研究了ZnWO4材料的晶体结构组成和形貌;选择恒电流充放电、循环伏安及交流阻抗测试了该材料的电化学性能.结果表明:ZnWO4材料在550℃下晶体结构完整,综合电化学性能较好,首次放电比容量为446.29 mAh/g,循环20次可逆比容量为200.7 mAh/g,比容量衰减相对较慢,充放电效率也较高,循环性能较好.Abstract: 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.
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