[EN] The electric double layer capacitor (EDLC) is an electrochemical capacitor storing electric energy by charging the electric double layer on the micropores of a nanoporous carbon electrode such as activated carbon. The EDLC has a fast charge-discharge property and excellent cycle life, but its energy density is lower than other electrochemical energy storage devices such as the rechargeable battery. The energy density of the EDLC can be improved by increasing the double layer capacitance and the maximum charging voltage. In this review, the author describes the activated carbon electrodes for use in a durable EDLC for high voltage charging.

This work was partially supported by NEDO and JST of Japan and the “Element Innovation” Project by Ministry of Education, Culture, Sports, Science & Technology in Japan. The author would like to express sincere appreciation to AION Co. and Mitsubishi Materials Co. for providing MICROLIGHT and foamed Al sheet respectively

Peer reviewed