Activated carbon for use in electric double layer capacitors
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Abstract
Activated carbon adapted for electric double layer capacitors is provided, which capacitors can give a large power density per unit volume and which capacitors, even when charge-and-discharge cycle is repeated under a large current or a constant voltage is continuously applied for a long time, undergo less decrease in output density.
That is, the present invention relates to the activated carbon manufactured by carbonization of coconut shell, which has a BET specific surface area of 2000 m2/g to 2500 m2/g, an average pore diameter of 1.95 nm (19.5 Å) to 2.20 nm (22 Å) and a pore volume of pores having a pore diameter calculated according to a Cranston-Inkley method of 5.0 nm (50 Å) to 30.0 nm (300 Å), of 0.05 cm3/g to 0.15 cm3/g.
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Citations
16 Claims
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1-9. -9. (canceled)
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10. A method of making an activated carbon, which comprises the steps of:
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a) carbonizing coconut shell, thereby producing a carbonization product; and
b) activating the carbonization product. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification