溶胶-凝胶法制备ZnWO_4负极材料及其电化学性能研究  

ZnWO_4 anode material preparation by sol-gel method and its electrochemical performance

作　　者：谢文菊[1] 王志涛[1] 张林森[2] 金恺[2] 吴方棣[1] 

机构地区：[1]武夷学院生态与资源工程学院,福建武夷山354300 [2]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450001

出　　处：《郑州轻工业学院学报（自然科学版）》2015年第2期11-15,21,共6页Journal of Zhengzhou University of Light Industry:Natural Science

基　　金：河南省科技计划项目(122300410297);武夷学院青年基金项目(XQ201101)

摘　　要：采用柠檬酸溶胶-凝胶法制备了Zn WO4材料,考察了焙烧温度对制备过程的影响.利用TG/DSC分析了Zn WO4前驱体的分解过程;通过XRD和SEM研究了Zn WO4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:Zn WO4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 m Ah/g,循环20次可逆比容量为200.7 m Ah/g,比容量衰减相对较慢,充放电效率也较高,循环性能较好.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.

关 键 词：锂离子电池 ZnWO4 材料 溶胶 - 凝胶法 焙烧温度 电化学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]