活性中间相碳微球在不同电解液中电化学性能

Electrochemical performance of activated mesocarbon microbead for supercapacitor in different electrolytes

以中间相碳微球(MCMB)为原料,采用KOH活化法制备了具有高比表面积的活性中间碳微球(a-MCMB),并以其为电极材料组装成双电层超级电容器。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、循环伏安(CV)和恒流充放电等方法研究了该材料的结构、表面形态和电化学性能。结果表明:所制备的a-MCMB在30%KOH水系电解液中和1mol/LLiPF6/(DMC+EC)有机电解液中都表现出良好的电容性能,其中水系电容器工作电压为1.0V,电极最高比电容为289.7F/g,有机系电容器工作电压为3.0V,电极最高比电容为217.4F/g,相应电容器的比能量分别为8.43Wh/kg和78.13Wh/kg。

Activated mesocarbon microbead （a-MCMB） with high specific surface area was prepared by KOH chemical activation method, and the a-MCMB was assembled into double-layer capacitor. The morphology and crystal structure of a-MCMB were investigated by scanning electron microscopy and X-ray diffraction. The capacitive properties of the electrode were investigated by cyclic voltammetry （CV） and galvanostatic charge-discharge in 30% KOH and LiPF6/（DMC＋EC）, respectively. The results show that the operating voltage of water system capacitor is 1.0 V with the initial specific capacitance of 289.7 F/g, and the operating voltage of organic system capacitor is 3.0 V with the initial specific capacitance of 217.4 F/g. The corresponding energy density is 8.43 Wh/kg and 78.13 Wh/kg, respectively.