Carbon material for electric double layer capacitor and process for producing the carbon material
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United States of America Patent
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Mar 4, 2014
Grant Date -
Jun 30, 2011
app pub date -
Sep 11, 2009
filing date -
Sep 16, 2008
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Abstract
The present invention provides a process for producing an activated carbon having a small average particle diameter, a uniform particle size and a relatively large specific surface area suitable for an electric double layer capacitor electrode, in an easy and cost effective manner. The process comprises calcining an easily graphitizable carbon material such as petroleum coke or coal coke, used as the raw material under an oxidizing gas atmosphere, adjusting the particle size of the carbon material, and then activating the carbon material. The use of the activated carbon produced by the process of the present invention in an electrode can provide an electric double layer capacitor having a large capacitance per unit volume.
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