超级电容器用V_2O_5的制备及性能  

Preparation of V_2O_5 for supercapacitor

作　　者：张勇[1] 王鸿旻[2] 王力臻[1] 张爱勤[1] 李晓峰[1] 冯辉[1] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450002 [2]中国烟草总公司职工进修学院,河南郑州450008

出　　处：《现代化工》2010年第4期41-43,45,共4页Modern Chemical Industry

基　　金：河南省高等学校青年骨干教师资助计划项目(豫教高[2009]844号);郑州市科技攻关项目(0910SGYG23259);郑州市金水区科技攻关项目(金科字[2009]35号(35))

摘　　要：以晶态V2O5(c-V2O5)为原料,采用H2O2-c-V2O5-溶胶-凝胶法制备了超级电容器用非晶态V2O5(a-V2O5)正极材料。研究了H2O2与c-V2O5的浓度比、搅拌时间、陈化时间、水基电解液种类及浓度、Cu2+掺杂等因素对材料结构和电容性能的影响。产物为无定型、纳米级粉体。c-V2O5与H2O2的浓度比为0.04 g/mL、搅拌时间12 h、陈化时间4 d、电解液为KOH且浓度为1 mol/L时,a-V2O5电极比电容最优,在30 mA/g电流密度下首次放电比电容为55.2 F/g。Cu2+掺杂在很大程度上可以提高a-V2O5的比电容,当Cu2+质量分数为0.5%时放电比电容高达111.4 F/g。Using crystalline V2O5 （c-V2O5 ） powders as raw materials,amorphous V2O5 （a-V2O5 ） is prepared by H2O2-c-V2O5-sol-gel technoque. The effects of the concentration ratio of H2O2/c-V2O5 , stirring time, aging time, the kinds of aqueous electrolyte, Cu2 ＋ doping on the structure and electrochemical properties of a-V2 O5 are analyzed. The results of XRD and electrochemical tests show that the material has amorphous structure with nano-sized particles, and the optimal conditions are as follows ：O. O4 g/mL as the concentration ratio of H2 O2/c-V2O5,12 hours of stirring,4 days of aging, and 1 mol/L of KOH concentration in solution. Under above conditions the product has excellent electrochemical performance,with charge-discharge at 3O mA/g its initial specific capacitance can be 55.2 F/g. Constant current charge- discharge measurements show that the specific capacitance of a-V2O5 electrode can reach 111.4 F/g when O. 5% CuE＋ added into a-V2 O5.

关 键 词：超级电容器 V2O5 H2O2-c—V2O5-溶胶—凝胶法 掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]