Activated Carbon for Electric Double Layer Capacitor, Activated Carbon Electrode for Electric Double Layer Capacitor, and an Electric Double Layer Capacitor Using Same
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United States of America Patent
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Issued Date -
Oct 25, 2007
app pub date -
Jul 9, 2004
filing date -
Jul 9, 2004
priority date (Note) -
Abandoned
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Abstract
An electric double layer capacitor excellent in cycle characteristic with which a high electrostatic capacity is obtained by impression of a low voltage is provided. Carbonization treatment is carried out in which 1 kg of meso carbon micro beads whose particle diameter is 25 .mu.m is heated in a nitrogen atmosphere at 800.degree. C. for 2 hours, and is cooled to room temperature. The carbide of meso carbon micro beads and sodium hydroxide powder are mixed in a ratio by weight of 1:2.5. Alkali activation treatment is carried out in which the mixture is heated in a helium atmosphere at 600.degree. C. for 1 hour, and the carbide is exposed to sodium vapor. After cooling to room temperature, 8 g of this carbon powder, 1 g of ketchen black 1 g and 1 g of polytetrafluoroethylene are kneaded and rolled into a sheet 0.5 mm thick. The sheet-like carbon material is stamped out 16 mm in diameter to be active carbon layers 3 which form polarizable electrodes 4 in combination with collecting layers 2. The polarizable electrodes 4 and a separator 1 are combined and impregnated with an organic electrolytic solution to produce an electric double layer capacitor A.
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