Graphene-Based Supercapacitors: Recent Developments

D. Burton
Angstron Materials, Inc., US

Keywords: graphene, superapacitors

Summary:

Abstract Supercapacitors are now at the center stage for designers in the power electronics and electric vehicle (EV) industries. Supercapacitors’ performance appears to be improved at a faster pace than that of the batteries and electrolytic capacitors they are seeking to replace. As compared by current lithium-ion batteries, supercapacitors exhibit a much higher power density (can be charged or discharged at a much higher rate), significantly longer cycle life (250,000 vs. 2,000 cycles, for instance), and are much safer. However, conventional activated carbon-based symmetric supercapacitors are capable of storing an energy density of typically < 8 Wh/kg (cell), in contrast to the typically 150 Wh/kg of lithium-ion cells. Significant improvements to the energy density are being made when graphene is used as the electrode active material. This presentation will begin with a brief review of the recent advancements in the use of graphene for supercapacitors (including electric double layer and redox-based). This will be followed by a discussion on our more recent work on graphene for supercapacitors and related energy storage devices.