铝箔电化学与化学刻蚀对超级电容器性能的影响比较

Comparison of effects of aluminum foil electrochemical and chemical etching on supercapacitor performance

对集流体铝箔分别进行电化学刻蚀和化学刻蚀,研究刻蚀时间对铝箔比表面积和表观形貌的影响,以及对用其组装的超级电容器的比电容与等效串联电阻的影响;并通过交流阻抗、循环伏安等性能比较2种刻蚀方法最佳刻蚀时间下铝箔制备的超级电容器的性能。结果表明,电化学刻蚀与化学刻蚀的最佳刻蚀时间分别为60 s和80 s,所组装超级电容器的比电容分别为154.4和165.2 F/g,等效串联电阻分别为1.8?和1.4?;化学刻蚀制备的铝箔具有较好的表面腐蚀状态,所组装的超级电容器具有较小的等效串联电阻与较大的比电容;2种刻蚀方法刻蚀的铝箔制备的超级电容器经2 000次循环后比电容衰减均不超过0.7%,循环性都很好。

The aluminum foil collectors were respectively etched by electrochemical and chemical method. The effect of etching time on specific surface area and apparent morphology of aluminum foil was studied, and the effect of the current collector made with aluminum foil for different etching time on supercapacitor’s specific capacitance and equivalent series resistance was also researched. Performance of supercapacitor made by aluminum foil etched by two etching methods under the optimal etching time were studied and compared by AC impedance, cyclic voltammetry and so on. The results show that the optimal etching time of electrochemical etching and chemical etching are 60 and 80 s respectively, the specific capacitance of supercapacitor prepared under the optimal etching time are 154.4 and 165.2 F/g, and the equivalent series resistance are 1.8 and 1.4 Ω. Aluminum foil etched by chemical method can obtain better surface corrosion condition, and the supercapacitor prepared with aluminum foil etched by chemical method can get smaller equivalent series resistance and bigger specific capacitance. The attenuation of specific capacitance of supercapacitor prepared by aluminum foil etched by two etching methods are all less than 0.7% after 2 000 cycles operation and the cycle performances are all very good.