Electrochemical double layer capacitor having carbon powder electrodes
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United States of America Patent
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Sep 30, 2003
Grant Date -
N/A
app pub date -
May 12, 2000
filing date -
May 12, 2000
priority date (Note) -
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Abstract
A double layer capacitor includes first and second electrode structures separated by a porous separator. The first and second electrode structures each include a current collector foil, a primary coating formed on the current collector foil, and a secondary coating formed on the primary coating. The primary coatings include conducting carbon powder, and the secondary coatings include activated carbon powder. A method of making the electrode structures includes the steps of: preparing a first slurry that includes conducting carbon powder and a binder; applying the first slurry to a current collector plate; drying the applied first slurry to form a primary coating; preparing a second slurry that includes activated carbon powder, a solvent and a binder; and applying the second slurry to the primary coating.
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