Enhancement of energy density for electric double-layer capacitor

Abstract

Electric double-layer capacitors (EDLCs) based on charge storage at the interface between a high-specific surface-area activated carbon electrode and an electrolyte are characterized by their reliability and high power density in comparison with batteries. However, the energy density of electric double-layer capacitors is smaller than that of batteries such as the lithium ion battery. To solve this problem, new electrolytes and electrode materials for EDLCs and new hybrid capacitors consisting of an activated-carbon cathode, a carbonaceous anode and an organic electrolyte are being developed.