水相锌二次电池正极材料V_2O_5/C的电化学性能研究  

Electrochemical Properties of a V_2O_5/C Composite in Aqueous Solution Used for Zinc Secondary Battery

作　　者：陶斌武[1] 刘建华[1] 李松梅[1] 赵亮[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《物理化学学报》2005年第3期338-342,共5页Acta Physico-Chimica Sinica

摘　　要：采用溶胶-凝胶法合成了一种V2O5/C复合材料.扫描电镜(SEM)和红外光谱(FTIR)分析表明,这是一种外层V2O5胶体包覆内层乙炔分子的多孔复合材料.以V2O5/C作正极,锌片为负极,Zn(ClO4)2溶液为电解质组成水相锌二次电池,采用循环伏安(CV)和电化学阻抗谱(EIS)等方法研究发现:V2O5:C质量比为1:1时电极具有最好的电化学性能,电池开路电压达1.64V;Zn2+能分别在1.01V和1.26V处分步嵌入V2O5/C结构中A、B两种位置,其嵌入电流密度峰值最高可达70mA·g-1,并且具有较好的循环充放电性能;在一定放电深度下,V2O5/C电极反应速率受Zn2+的扩散过程控制.A composite of vanadium pentoxide/carbon was prepared by sol-gel method. By using scanning electronic microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR), it was found that the composite was composed of porous particles. Inner part of the composite was carbon particles which covered by an outer layer of vanadium pentoxide Sol. The electrochemical properties of the composite as cathode material in aqueous solution for zinc secondary battery were studied by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). When the mass ratio Of V2O5/C was 1: 1, the composite electrode showed good electrochemical properties: open circuit potential of its battery reached 1.64 V; zinc ions were reversibly intercalated into the composite electrode in site A at 1.26 V and site B at 1.01 V, with a highest intercalation rate 70 mA center dot g(-1); cycling performance of the composite electrode was quite good in a test of 20 charge-discharge cycles. The reaction process of V2O5/C composite electrode was controlled by the diffusion rate of zinc ions in V2O5.

关 键 词：锌二次电池 正极材料 V2O5 嵌入 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]