Electric double-layer capacitor
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United States of America Patent
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Dec 1, 1992
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N/A
app pub date -
Nov 5, 1991
filing date -
Nov 5, 1990
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Abstract
The present invention relates to capacitors utilizing an electric double layer formed in the interface of polarizable electrodes and an electrolyte. By using as the primary material of the polarizable electrodes an activated carbon in which the difference in titration value between the cases where sodium carbonate is used for neutralization titration of the activated carbon and where sodium hydrogencarbonate is used therefor is 0.195 meq/g or more to the weight of the activated carbon, the quantity of presence of the acidic functional group II (carboxyl group present as lactone) on the surface of the activated carbon is increased and, as a result, the affinity between the polarizable electrodes and the electrolyte is enhanced, thus providing electric double-layer capacitors low in variation with time and yet large in capacity.
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