ELECTROCHEMICAL CAPACITORS MADE USING ADVANCED NANOMATERIALS
John R. Miller
17210 Parkland Drive
Shaker Heights, Ohio, US 44120
Friday, October 24, 2003, 9:30 a.m.
Ben Bandy Conference Center
Center for Applied Energy Research
Electrochemical capacitors (ECs), often referred to as supercapacitors or ultracapacitors, have the highest energy density of all capacitor types. However, most have very non-ideal performance characteristics due to their construction--use of activated carbon electrodes. This greatly limits applications where EC technology is useful. Performance characteristics are dictated by physical properties of the carbon including its conductivity, surface area, pore size distribution, pore volume, crystallinity, purity, and surface condition. Recently created nanostructured materials present the possibility of greatly expanding the performance envelope of ECs, opening up important new applications. This presentation will review briefly the evolution of electrochemical capacitor technology then describe experimental results from ECs constructed with nanostructured carbon electrode materials. An idealized carbon nanomaterial is described with projections of its anticipated performance.