Wednesday, August 15, 2007

US Patent 7255924 - Porous carbon with electroactive polymer coating

Supercapacitors are a new type of electrical storage device which balance the benefits of batteries (high energy density) and capacitors (quick charging/discharging). This patent based on work from the U.S. Naval Research Laboratory (NRL) teaches a new composite for supercapacitors with improved charge/discharge rates by forming an electroactive polymer coating on porous carbon with nanoscale thickness. Claim 1 reads:

1. A composite comprising a porous carbon structure comprising a surface and pores; and a coating on the surface comprising an electroactive polymer; wherein the coating does not completely fill or obstruct a majority of the pores; wherein the coating is formed by self-limiting electropolymerization and does not exceed about 15 nanometers in thickness.

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