In this research, high-capacity once electric double layer capacitor (EDLC) was targeted, influence on capacitance by quantity of functional group of Ketjen black as the conductive materials of the polarized electrode was examined. Existence of an oxygen functional group on the surface of carbon electrode in EDLC is connected to capacitance increasing with faraday reaction and improvement of wettability of a water solution electrolyte to an electrode[1]. Therefore, the EDLC was evaluated with different Ketjen black of quantity of functional group. As the result, wettability of a water solution electrolyte to an electrode was improved by increase of a functional group, and osmosis of an ion became good, and the capacitance was increased. In addition, an ion was adsorbed at the deep of a pore by the removal of a functional group, and capacitance was increased.

In this study, capacitance behavior of Electric Double Layer Capacitor (EDLC) with nanocomposite electrode for energy storage has been examined by charge-discharge characteristics. Also, internal resistance of EDLC was evaluated using two kinds of conducting filler. The one is acetylene black (AB) and the other is Ketjenblack (KB). KB was used for polarized electrodes instead of conventionally used AB in order to improve the capacitance and to decrease the internal resistance of EDLC. Usually, KB exhibits higher electronic conductivity compared to AB, and KB could be considered as conducting filler. The temperature dependence of capacitance and internal resistance of prepared EDLC using aqueous electrolyte, organic electrolyte and 2 kinds of ionic liquid was evaluated. Also, adsorbed ion numbers on the surface of KB and pore utilization of KB on each electrolyte was evaluated. As the results, it was found that the KB containing EDLC showed fairly high capacitance compared to AB containing one on all electrolyte. In addition, temperature dependence of EDLC containing KB and AB were measured on temperature from 0 °C to 50 °C. It was understood that KB was superior to AB in all temperature and all electrolyte on capacitance and internal resistance. Moreover, adsorbed ion numbers on the surface of KB and pore utilization of KB was high using aqueous electrolyte.

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