Electrode material for electric double layer capacitor and electric double layer capacitor using the same
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United States of America Patent
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Nov 25, 2003
Grant Date -
Oct 3, 2002
app pub date -
Mar 18, 2002
filing date -
Mar 21, 2001
priority date (Note) -
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Abstract
An electrode material for an electric double layer capacitor having a carbon fiber as an essential material. The carbon fiber has a coaxial stacking morphology of truncated conical tubular graphene layers, and each of the truncated conical tubular graphene layers includes a hexagonal carbon layer. Edges of the hexagonal carbon layer are exposed. The exposed edges of the hexagonal carbon layers have a high degree of activity and can be modified with functional groups such as --COOH, --CHO, or --OH. This enables use of the carbon fiber as the electrode material. The specific surface area of the surfaces on which the edges are exposed is extremely large, whereby a large-capacitance electric double layer capacitor can be formed.
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