ELECTRIC DOUBLE LAYER CAPACITANCE DEVICE
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Abstract
The present application is directed to electric double layer capacitance (EDLC) devices. In one aspect, the present application is directed to an electrode comprising an activated carbon cryogel having a tunable pore structure wherein: the surface area is at least 1500 m2/g as determined by nitrogen sorption at 77K and BET analysis; and the pore structure comprises a pore volume ranging from about 0.01 cc/g to about 0.25 cc/g for pores having a pore diameter of 0.6 to 1.0 nm. In another aspect, the present application is directed to an Electric Double Layer Capacitor (EDLC) device comprising an activated cryogel.
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Citations
67 Claims
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1-35. -35. (canceled)
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36. An electrode comprising:
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A) an activated carbon material having a surface area of greater than about 1500 m2/g, as determined by nitrogen sorption at 77 K and BET analysis, and a pore structure comprising mesopores having a diameter ranging from about 2.0 nm to about 10.0 nm and a pore volume ranging from about 0.01 cc/g to about 0.25 cc/g for pores having a pore diameter of 0.6 nm to 1.0 nm, as determined from N2 sorption derived DFT; and B) a metal oxide or conductive polymer, the electrode further comprising a specific capacitance of at least 100 F/g and a specific power of at least 25 W/g when used as an electrode in an electric double layer capacitor device comprising an electrolyte comprising equal volumes of propylene carbonate and dimethylcarbonate and further comprising about 1.0 M tetraethylammonium tetrafluoroborate. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. An electrical energy storage device comprising an electrode comprising:
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A) an activated carbon material having a surface area of greater than about 1500 m2/g, as determined by nitrogen sorption at 77 K and BET analysis, and a pore structure comprising mesopores having a diameter ranging from about 2.0 nm to about 10.0 nm and a pore volume ranging from about 0.01 cc/g to about 0.25 cc/g for pores having a pore diameter of 0.6 nm to 1.0 nm, as determined from N2 sorption derived DFT; and B) a metal oxide or conductive polymer, the electrode further comprising a specific capacitance of at least 100 F/g and a specific power of at least 25 W/g when used as an electrode in an electric double layer capacitor device comprising an electrolyte comprising equal volumes of propylene carbonate and dimethylcarbonate and further comprising about 1.0 M tetraethylammonium tetrafluoroborate. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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Specification