Ultra-high surface area PVDC-based carbon materialby chemical activation and its application tonon-aqueous EDLC

摘要

An organic solvent type electrolytic solution is employed to apply on electric double-layer capacitor made ofa PVDC-based carbon material. Although the PVDC-based carbon material shows an excellent capacitance overa 100F/g in an aqueous solvent type electrolytic solution, it shows a very small value of capacitance was obtainedin an organic solvent type electrolyte solution, which does not even exceed the value of 5 F/g. It also confined themost effective temperature to get a capacitance shifted from 700C to 900 C. At this time, chemical activation withKOH is tried to improve of the performance of the capacitance on PVDC-based carbon. The information on howthe double layer capacitance is affected by variation of the pore size distribution was explained on the basis of theconventional pore analysis by means of gas adsorption. It was confirmed that the chemical activation with KOHquite effective to improve the capacitance. After the activation with KOH, especially by the 400wt. % addition,the capacitance obtained the value as high as 55 F/g, which is equivalent to 220F/g for a conventionalthree-compartment system with reference electrode. It was confirmed that the impregnation of KOH is effectiveto widen the pore diameter and affect to the improvement of the capacitance. The effect by the functional groupson the surface of PVDC-carbons was also mentioned.