CuWO_4的合成及其电化学性能研究  

Synthesis and electrochemical performance of CuWO_4 materials

作　　者：段连生[1,2] 江雪娅[1] 王石泉[1] 但美玉[1] 冯传启[1] 

机构地区：[1]湖北大学化学与化工学院,湖北武汉430062 [2]湖北第二师范学院化学与生命科学学院,湖北武汉430205

出　　处：《电源技术》2013年第12期2118-2119,2157,共3页Chinese Journal of Power Sources

基　　金：湖北省教育厅重点项目资助(D20113004)

摘　　要：以Cu(Ac)2·H2O、(NH4)10W12O41W12·x H2O为原料,柠檬酸作为螯合剂,用流变相反应方法合成CuWO4,用魔芋精粉(葡甘聚糖)为碳源,对CuWO4进行碳包覆,采用X射线衍射(XRD)、扫描电镜(SEM)技术对合成材料的晶体结构和微观形貌进行表征,采用恒流充、放电系统及交流阻抗方法对CuWO4的电化学性能进行测量,结果表明:在不同温度下合成的CuWO4材料都具有较高的初始容量,但在700℃下合成材料的可逆比容量较高(320 mAh/g),经过50次循环后比容量保持为190 mAh/g;而该样品经过碳表面包覆后,不仅可逆比容量提高到500 mAh/g,而且表现出优良的循环性能,经过50次循环后比容量仍然保持在430 mAh/g左右。CuWO4经过改性后,具有独特的电化学性能,可作为有潜力的锂离子电池负极材料。CuWO4 compound was synthesized by rheological phase method, using copper acetate and ammonium tungstate hydrate as raw materials, citric acid as coordination agent. The expected compound was coated by carbon （konjac powder as carbon source）. The crystal structure and microstructure of the expected compound were characterized by XRD and SEM techniques. And the electrochemical properties of the samples were investigated by constant-current charge-discharge system and AC impedence spectroscopy testing method. The results show that the performances of CuWO4 synthesized at 700 ℃ has high reversible specific capacity （320 mAh/g）, it can remain stable at 190 mAh/g after 50 cycles. Particularly, the CuWO4 modified by carbon not only behaved higher reversible specific capacity（450 mAh/g）, but also excellent cycle performance. The CuWO4/C will be promising candidate of new anode materials for lithium ion battery application.

关 键 词：锂离子电池 负极材料 CuWO4 流变相反应法 

分 类 号：TM912[电气工程—电力电子与电力传动]