New Carbon Activation Process for Increased Surface Accessibility in Electrochemical Capacitors

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Description

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 350 C for about 20 minutes, and repeating alternately the nitric acid step and the heating step from 7 to ... continued below

Physical Description

17 p.

Creation Information

Doughty, Daniel H. & Eisenmann, Erhard T. March 16, 1999.

Context

This patent is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this patent can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

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 350 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.

Physical Description

17 p.

Notes

OSTI as DE00782831

Medium: P; Size: 17 pages

Source

  • Patent File Date: 1999 Mar 16

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  • Report No.: PATENTS-US--A9270670
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 782831
  • Archival Resource Key: ark:/67531/metadc716835

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • March 16, 1999

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

Description Last Updated

  • April 7, 2017, 3:36 p.m.

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Doughty, Daniel H. & Eisenmann, Erhard T. New Carbon Activation Process for Increased Surface Accessibility in Electrochemical Capacitors, patent, March 16, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc716835/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.