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.
84 Citations
79 Claims
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1-35. -35. (canceled)
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36. An electrode comprising a binder and an activated carbon cryogel, the activated carbon cryogel comprising:
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a surface area of greater than 1500 m2/g as determined by nitrogen sorption at 77 K and BET analysis; and a pore structure comprising a pore volume ranging from 0.10 cc/g to 0.42 cc/g for pores having a diameter ranging from 0.6 nm to 1.5 nm as determined from N2 sorption derived DFT, wherein the specific capacitance of the electrode ranges from 75 F/g to 150 F/g and the specific power of the electrode ranges from 10 W/g to 50 W/g when each of the specific capacitance and specific power is measured 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)
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46. An Electric Double Layer Capacitor (EDLC) device comprising:
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a) a positive electrode and a negative electrode wherein each of the positive and the negative electrodes comprise an activated carbon cryogel and a binder; b) an inert porous separator; and c) an electrolyte; wherein the positive electrode and the negative electrode are separated by the inert porous separator, and wherein the activated carbon cryogel comprises; a surface area of greater than 1500 m2/g as determined by nitrogen sorption at 77 K and BET analysis; and a pore structure comprising a pore volume ranging from 0.10 cc/g to 0.42 cc/g for pores having a diameter ranging from 0.6 nm to 1.5 nm as determined from N2 sorption derived DFT, wherein the specific capacitance of each of the positive and negative electrodes independently ranges from 75 F/g to 150 F/g and the specific power of each of the positive and negative electrodes independently ranges from 10 W/g to 50 W/g when each of the specific capacitance and specific power is measured 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 (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. An electrode comprising a binder and an activated carbon cryogel, the activated carbon cryogel comprising:
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a surface area ranging from 500 m2/g to 1000 m2/g as determined by nitrogen sorption at 77 K and BET analysis, wherein the specific capacitance of the electrode ranges from 20 F/g to 50 F/g the specific capacitance is measured 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 (61, 62, 63, 64, 65, 66, 67, 68)
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69. An Electric Double Layer Capacitor (EDLC) device comprising:
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a) a positive electrode and a negative electrode wherein each of the positive and the negative electrodes comprise an activated carbon cryogel and a binder; b) an inert porous separator; and c) an electrolyte; wherein the positive electrode and the negative electrode are separated by the inert porous separator, and wherein the activated carbon cryogel comprises; a surface area ranging from 500 m2/g to 1000 m2/g as determined by nitrogen sorption at 77 K and BET analysis, wherein the specific capacitance of each of the positive and negative electrodes independently ranges from 20 F/g to 50 F/g. when the specific capacitance is measured 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 (70, 71, 72, 73, 74, 75, 76, 77, 78, 79)
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Specification