Electric double layer capacitance device
First Claim
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1. An electrode comprising a binder and an activated carbon cryogel having a tunable pore structure wherein the activated carbon cryogel comprises:
- a surface area of greater than about 1500 m2/g as determined by nitrogen sorption at 77 K and BET analysis;
a pore structure comprising mesopores having a diameter ranging from about 2.0 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 to 1.0 nm as determined from N2 sorption derived DFT; and
micropores having an effective length of less than about 10 nm as determined by TEM measurements;
wherein the specific capacitance of the electrode is at least 100 F/g and the specific power of the electrode is at least 25 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.
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Abstract
An electric double layer capacitance (EDLC) device is disclosed having an electrode containing an activated carbon cryogel with a tunable pore structure, the carbon cryogel having a surface area of at least 1500 m2/g as determined by nitrogen sorption at 77K and BET analysis, and the pore structure having 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.
113 Citations
37 Claims
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1. An electrode comprising a binder and an activated carbon cryogel having a tunable pore structure wherein the activated carbon cryogel comprises:
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a surface area of greater than about 1500 m2/g as determined by nitrogen sorption at 77 K and BET analysis; a pore structure comprising mesopores having a diameter ranging from about 2.0 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 to 1.0 nm as determined from N2 sorption derived DFT; and micropores having an effective length of less than about 10 nm as determined by TEM measurements; wherein the specific capacitance of the electrode is at least 100 F/g and the specific power of the electrode is at least 25 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 (2, 3, 4, 5, 6, 7, 8, 36)
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9. 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 having a tunable pore structure; 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 about 1500 m2/g as determined by nitrogen sorption at 77 K and BET analysis; a pore structure comprising mesopores having a diameter ranging from about 2.0 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 to 1.0 nm as determined from N2 sorption derived DFT; and micropores having an effective length of less than about 10 nm as determined by TEM measurements; and the specific capacitance of each of the positive and negative electrodes is independently at least 100 F/g and the specific power of each of the positive and negative electrodes is independently at least 25 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 (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. 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 negative electrode comprises an activated carbon cryogel and polytetrafluoroethylene; b) an inert porous separator comprising polypropylene or polyethylene; c) a first and a second current collector each comprising a non-corrosive metal; and d) an electrolyte comprising equal volumes of propylene carbonate and dimethylcarbonate and further comprising about 1.0 m tetraethylammonium-tetrafluoroborate; wherein the positive and negative electrodes are separated by the porous separator and each is in contact with one current collector and wherein the activated carbon cryogel comprises; a surface area of greater than about 1500 m2/g as determined by nitrogen sorption at 77 K and BET analysis; a pore structure comprising mesopores having a diameter ranging from about 2.0 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 to 1.0 nm as determined from N2 sorption derived DFT; and micropores having an effective length of less than about 10 nm as determined by TEM measurements; wherein the specific capacitance of each of the positive and negative electrodes as measured in the device is independently at least 100 F/g and the specific power of each of the positive and negative electrodes as measured in the device is independently at least 25 W/g. - View Dependent Claims (30, 31, 32, 33, 34, 35, 37)
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Specification