Electric double layer capacitor
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United States of America Patent
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Oct 23, 2007
Grant Date -
Oct 6, 2005
app pub date -
Mar 21, 2005
filing date -
Mar 30, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is intended to reduce expansion proportion of electric double layer capacitors by combining nonporous carbonaceous electrodes produced by a specific method with an electrolyte of a specific structure. Provided is an electric double layer capacitor comprising nonporous carbonaceous electrodes soaked in an organic electrolytic solution, wherein the organic electrolytic solution contains a pyrrolidinium compound salt as a solute, and wherein the carbonaceous electrodes are electrodes obtained by the method comprising a step of obtaining a carbon powder by prebaking a needle coke green powder under an inert atmosphere, baking the prebaked needle coke powder in the presence of alkali hydroxide under an inert atmosphere, and removing the alkali hydroxide; and a step of shaping the carbon powder.
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