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Carbon activation process for increased surface accessibility in electrochemical capacitors

United States Patent

October 9, 2001
View the Complete Patent at the US Patent & Trademark Office
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A process for making carbon film or powder suitable for double capacitor electrodes having a capacitance of up to about 300 F/cm.sup.3 is disclosed. This is accomplished by treating in aqueous nitric acid for a period of about 5 to 15 minutes thin carbon films obtained by carbonizing carbon-containing polymeric material having a high degree of molecular directionality, such as polyimide film, then heating the treated carbon film in a non-oxidizing atmosphere at a non-graphitizing temperature of at least C. for about 20 minutes, and repeating alternately the nitric acid step and the heating step from 7 to 10 times. Capacitors made with this carbon may find uses ranging from electronic devices to electric vehicle applications.
Doughty; Daniel H. (Albuquerque, NM), Eisenmann; Erhard T. (Belpre, OH)
The United States of America as represented by the Department of Energy (Washington, DC)
09/ 270,670
March 16, 1999
The United States Government has rights in this invention pursuant to Contract No. DE-AC04-94AL85000 between the U.S. Department of Energy (DOE) and Sandia Corporation.