Electrodes were fabricated based on activated carbon powder BP-20, conducting agent such as Super P, vapor grown carbon fiber (VGCF) and acetylene black (AB), and the mixed binders of flexible poly-(vinylidenefluoride-co-hexafluoropropylene) [P(VdF-co-HFP)] and cross-linking dispersion agent of polyvinylpyrrolidone(PVP) to increase mechanical strength. In the electrode fabrication of unit cell, it was ascertained that electrochemical characteristics were greatly increased with 90 wt.% of BP-20, 5 wt.% of Super P and 5 wt.% of mixed binder [P(VdF-co-HFP): PVP=7:3]. Also electric conductivity was increased and internal resistance was decreased with addition of conducting agent. According to impedance measurement of the electrode with the addition of conducting agent, we found that it was possible to charge rapidly due to the fast steady-state current convergence caused by low equivalent series resistance (AC-ESR), fast charge transfer rate at interface between electrode and electrolyte and low RC time constant. The self-discharge of unit cell showed that diffusion process was controlled by the ion concentration difference of initial electrolyte due to the characteristics of electric double layer capacitor (EDLC) charged by ion adsorption in the beginning, but this by current leakage through the double-layer at the electrode/electrolyte interface had a minor effect and voltages of curves were remained constant regardless of electrode material. We found that the 2.3 V/230 F grade EDLC would be applied to industrial safety usage such as uninterrupted power supply (UPS) because of the constant DC-ESR by IR drop regardless of discharge current.