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:
-
- Albuquerque, NM
- Belpre, OH
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 874038
- Patent Number(s):
- 6299850
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01G - CAPACITORS
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01M - PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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 = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}
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