CuV2O6的合成及电化学性能  

The synthesis and electrochemical performance of CuV_2O_6

作　　者：曹晓雨[1] 谢玲玲[1] 詹晖[2] 周运鸿[2] 

机构地区：[1]河南工业大学化学化工学院,河南郑州450001 [2]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《电池》2008年第3期142-145,共4页Battery Bimonthly

摘　　要：采用离子交换法制备V2O5.nH2O,与Cu2O粉末通过软化学反应合成了CuV2O6。利用TG、XRD、XPS和SEM等方法对产物进行了分析,采用恒流充放实验进行了电化学性能测试。形成CuV2O6所需的焙烧温度较低,所制备的CuV2O6颗粒细小均匀,在350℃下制备的CuV2O6的首次放电比容量为355 mAh/g(30 mA/g)。非现场XRD和EIS谱的结果表明,单质Cu在放电过程中的析出及由此导致CuV2O6的结构不可逆性,是容量衰减的根源。V2O5·nH2O was prepared by ion exchange method,and CuV2O6 was synthesized through soft chemistry reaction with Cu2O powder. The products were analyzed by TG,XRD,XPS and SEM methods; the electrochemical performance was tested by galvanostatic discharge-charge experiments. The required roasting temperature for the formation of CuV2O6 was lower; the particles of the prepared CuV2O6 were small and homogeneous; the initial specific discharge capacity of the CuV2O6 prepared at 350 ℃ was 355 mAh/g （30 mA/g）. The results of ex-situ XRD and EIS plots showed that the formation of element copper during the discharge process and the structural irreversibility of CuV2O6 induced by the former was the origin of the capacity fading.

关 键 词：锂离子电池 正极材料 CuV2O6 容量衰减 

分 类 号：TM912.9[电气工程—电力电子与电力传动]