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Asymmetric Activated Carbon/Activated Carbon Capacitors Design

Gary Lu

Supercapacitors are energy storage devices that, when compared to batteries, has a high power density but a low energy density. Their low energy density can be overcome by employing an asymmetric configuration in mass electrodes, in which each electrode operates within its maximum available potential window, resulting in the system's maximum voltage output. The capacitance and potential stability limits of the electrodes are used to optimize such asymmetric capacitors, with the design's reliability largely dependent on the accuracy and approach used for electrochemical characterization. As a result, if a well-thought-out procedure is not followed, performance may be lower than expected, and the system may fail.