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Title: Carbon activation process for increased surface accessibility in electrochemical capacitors

Abstract

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.degree. 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.

Inventors:
 [1];  [2]
  1. (Albuquerque, NM)
  2. (Belpre, OH)
Issue Date:
Research Org.:
SANDIA CORP
OSTI Identifier:
874038
Patent Number(s):
6299850
Assignee:
United States of America as represented by Department of Energy (Washington, DC) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
carbon; activation; process; increased; surface; accessibility; electrochemical; capacitors; film; powder; suitable; double; capacitor; electrodes; capacitance; 300; cm; disclosed; accomplished; treating; aqueous; nitric; acid; period; 15; minutes; films; obtained; carbonizing; carbon-containing; polymeric; material; degree; molecular; directionality; polyimide; heating; treated; non-oxidizing; atmosphere; non-graphitizing; temperature; 350; 20; repeating; alternately; step; 10; times; ranging; electronic; devices; electric; vehicle; applications; non-oxidizing atmosphere; polymeric material; electric vehicle; nitric acid; carbon film; electronic devices; oxidizing atmosphere; carbon films; powder suitable; electrochemical capacitors; increased surface; electronic device; heating step; containing polymer; containing poly; aqueous nitric; electrochemical capacitor; treated carbon; activation process; containing polymeric; /423/361/429/

Citation Formats

Doughty, Daniel H., and Eisenmann, Erhard T. Carbon activation process for increased surface accessibility in electrochemical capacitors. United States: N. p., 2001. Web.
Doughty, Daniel H., & Eisenmann, Erhard T. Carbon activation process for increased surface accessibility in electrochemical capacitors. United States.
Doughty, Daniel H., and Eisenmann, Erhard T. Mon . "Carbon activation process for increased surface accessibility in electrochemical capacitors". United States. https://www.osti.gov/servlets/purl/874038.
@article{osti_874038,
title = {Carbon activation process for increased surface accessibility in electrochemical capacitors},
author = {Doughty, Daniel H. and Eisenmann, Erhard T.},
abstractNote = {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.degree. 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

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