KOH活化中间相炭微球及其在超级电容器中电化学性能的研究

Preparation of KOH activated mesocarbon microbeads and the electrochemical properties in supercapacitors

以中间相炭微球为原料,采用氢氧化钾为活化剂,制备出具有高比表面积、高孔容的活性炭微球,并将其组装成超级电容器,对其进行电化学性能测试。结果表明,制备的活化微球KM900,其比表面积达到1861.0 m^(2)/g,微孔孔容达到0.802 cm^(3)/g。同时,该材料在0.5 A·g^(-1)的电流密度下比电容可达348.2 F·g^(-1),在10 A·g^(-1)的高电流密度下还保持208.0 F·g^(-1)的比电容,容量保持率为59.7%。本实验也充分说明了中间相炭微球作为超级电容器用活性炭的原料能发挥出高容量、高倍率性能的特点。

Using mesocarbon microbeads as raw material and potassium hydroxide as activator,activated carbon microspheres with high specific surface area and high pore volume were prepared and its electrochemical performance was tested by assembling into supercapacitors.The results show that the surface area and pore volume of the prepared activated microspheres are 1861.0 m^(2)/g and 0.802 cm^(3)/g respectively.At the same time,the specific capacitance of the material can reach 348.2 F/g at the current density of 0.5 A/g and 208.0 F/g at the high current density of 10 A/g,and the capacity retention rate is 59.7%.The experiment also fully shows that mesocarbon microbeads can play the characteristics of high capacity and high rate as the raw material of activated carbon for supercapacitors.