Electric double layer capacitance device
AssigneesBASF SE, University of Washington
InventorsAaron M. Feaver, Guozhong Cao
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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.
Claims24
An electrode comprising a binder and activated carbon, wherein the activated carbon 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 mesopores having a diameter ranging from 2.0 nm to 10.0 nm and a pore volume ranging from 0.01 cc/g to 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,
- wherein the electrode has a specific capacitance of at least 100 F/g and a specific power of 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 1.0 M tetraethylammonium tetrafluoroborate.
An Electric Double Layer Capacitor (EDLC) device comprising:
- a) a positive electrode and a negative electrode, wherein each of the positive and the negative electrodes comprise activated carbon;
- 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 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 mesopores having a diameter ranging from 2.0 nm to 10.0 nm and a pore volume ranging from 0.01 cc/g to 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
- wherein each of the positive and negative electrodes independently has a specific capacitance of at least 100 F/g and a specific power of 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 propylene carbonate and dimethylcarbonate and further comprising tetraethylammonium tetrafluoroborate.
An electric double layer capacitor (EDLC) device comprising:
- a) a positive electrode and a negative electrode, wherein each of the positive and negative electrode comprises activated carbon and polytetrafluoroethylene;
- b) an inert porous separator comprising polypropylene, polyethylene or both;
- c) a first and a second current collector each comprising a non-corrosive metal;
- and
- d) an electrolyte comprising substantially 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 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 mesopores having a diameter ranging from 2.0 nm to 10.0 nm and a pore volume ranging from 0.01 cc/g to 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
- wherein each of the positive and negative electrodes independently has a specific capacitance of at least 100 F/g and a specific power of at least 25 W/g, as measured in the EDLC device.
Dependencies are inferred from the claim text.