Carbon activation process for increased surface accessibility in electrochemical capacitors
- Albuquerque, NM
- Belpre, OH
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.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-94AL85000
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Number(s):
- US 6299850
- OSTI ID:
- 874038
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
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