NiO/AC非对称超级电容器的研究

Study on NiO/AC Asymmetric Supercapacitors

通过热处理球形Ni(OH)2得到NiO粉末,将其作为正极与活性炭(AC)负极组装成非对称超级电容器,用恒流充放电测试分析了超级电容器的电容特性。讨论了正负极活性物质比例、充放电电流和热处理时间对超级电容器比电容量、内阻的影响。结果表明:正负极活性物质比为1∶3,工作电流密度为200 mA/g,当Ni(OH)2的热处理时间为2h,充电电压为1.3 V时,超级电容器的双电极比电容量可达71.5 F/g。

The NiO powder is obtained by the heat treatment of spherical Ni(OH)_2.Asymmetrical supercapacitors are assembled using NiO as the positive electrodes and AC as the negative electrodes and tested through the galvanostantic charge/discharge measurements.The effect of the mass ratio of positive electrode and negative electrode,charge/discharge current density and annealing time on specific capacitance,interior resistance was discussed.It is proved that the specific capacitance of the supercapacitor reaches 71.5 F/g under the mass ratio of 1:3,the charge/discharge current density of 200mA/g,the annealing time of 2 hours and charge voltage of 1.3V.