CAJ | 학술논문

以晶态V_2O_5(c-V_2O_5)为原料,采用H_2O_2-c-V_2O_5-溶胶-凝胶法制备了超级电容器用非晶态V_2O_5(a-V_2O_5)正极材料.研究了H_2O_2与c-V_2O_5的浓度比、搅拌时间、陈化时间、水基电解液种类及浓度、Cu~(2+)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-V_2O_5与H_2O_2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-V_2O_5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.Cu~(2+)掺杂在很大程度上可以提高a-V_2O_5的比电容,当Cu~(2+)质量分数为0.5%时放电比电容高达111.4 F/g.
이정태V_2O_5(c-V_2O_5)위원료,채용H_2O_2-c-V_2O_5-용효-응효법제비료초급전용기용비정태V_2O_5(a-V_2O_5)정겁재료.연구료H_2O_2여c-V_2O_5적농도비、교반시간、진화시간、수기전해액충류급농도、Cu~(2+)참잡등인소대재료결구화전용성능적영향.산물위무정형、납미급분체.c-V_2O_5여H_2O_2적농도비위0.04 g/mL、교반시간12 h、진화시간4 d、전해액위KOH차농도위1 mol/L시,a-V_2O_5전겁비전용최우,재30 mA/g전류밀도하수차방전비전용위55.2 F/g.Cu~(2+)참잡재흔대정도상가이제고a-V_2O_5적비전용,당Cu~(2+)질량분수위0.5%시방전비전용고체111.4 F/g.
Using crystalline V_2O_5(c-V_2O_5) powders as raw materials,amorphous V_2O_5(a-V_2O_5) is prepared by H_2O_2-c-V_2O_5-sol-gel technoque.The effects of the concentration ratio of H_2O_2/c-V_2O_5,stirring time,aging time,the kinds of aqueous electrolyte,Cu~(2+) doping on the structure and electrochemical properties of a-V_2O_5 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:0.04 g/mL as the concentration ratio of H_2O_2/c-V_2O_5,12 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 30 mA/g its initial specific capacitance can be 55.2 F/g.Constant current charge-discharge measurements show that the specific capacitance of a-V_2O_5 electrode can reach 111.4 F/g when 0.5% Cu~(2+) added into a-V_2O_5.