Ultracapacitor for use at high temperatures
First Claim
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1. An ultracapacitor comprising:
- a first electrode that comprises a first current collector electrically coupled to a first carbonaceous coating;
a second electrode that comprises a second current collector electrically coupled to a second carbonaceous coating, wherein the first current collector and the second current collector each contain a substrate that includes a conductive metal;
a separator positioned between the first electrode and the second electrode;
a nonaqueous electrolyte that is in ionic contact with the first electrode and the second electrode; and
a housing within which the first electrode, the second electrode, the separator, and the electrolyte are retained;
wherein the capacitor exhibits a capacitance value of about 6 Farads per cubic centimeter or more, as determined in a hot atmosphere having a temperature of 85°
C. at a frequency of 120 Hz and without an applied voltage, further wherein the ratio of the capacitance value of the ultracapacitor after being exposed to the hot atmosphere for 1008 hours to the capacitance value of the ultracapacitor when initially exposed to the hot atmosphere is about 0.75 or more.
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Abstract
An ultracapacitor that is in contact with a hot atmosphere having a temperature of about 80° C. or more is provided. The ultracapacitor contains a first electrode, second electrode, separator, nonaqueous electrolyte, and housing is provided. The first electrode comprises a first current collector electrically coupled to a first carbonaceous coating and the second electrode comprises a second current collector electrically coupled to a second carbonaceous coating. The capacitor exhibits a capacitance value within the hot atmosphere of about 6 Farads per cubic centimeter or more as determined at a frequency of 120 Hz and without an applied voltage.
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Citations
37 Claims
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1. An ultracapacitor comprising:
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a first electrode that comprises a first current collector electrically coupled to a first carbonaceous coating; a second electrode that comprises a second current collector electrically coupled to a second carbonaceous coating, wherein the first current collector and the second current collector each contain a substrate that includes a conductive metal; a separator positioned between the first electrode and the second electrode; a nonaqueous electrolyte that is in ionic contact with the first electrode and the second electrode; and a housing within which the first electrode, the second electrode, the separator, and the electrolyte are retained; wherein the capacitor exhibits a capacitance value of about 6 Farads per cubic centimeter or more, as determined in a hot atmosphere having a temperature of 85°
C. at a frequency of 120 Hz and without an applied voltage, further wherein the ratio of the capacitance value of the ultracapacitor after being exposed to the hot atmosphere for 1008 hours to the capacitance value of the ultracapacitor when initially exposed to the hot atmosphere is about 0.75 or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An ultracapacitor comprising:
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a first electrode that comprises a first current collector electrically coupled to a first carbonaceous coating; a second electrode that comprises a second current collector electrically coupled to a second carbonaceous coating, wherein the first current collector and the second current collector each contain a substrate that includes a conductive metal; a separator positioned between the first electrode and the second electrode; a nonaqueous electrolyte that is in ionic contact with the first electrode and the second electrode; and a housing within which the first electrode, the second electrode, the separator, and the electrolyte are retained; wherein the capacitor exhibits a capacitance value of about 6 Farads per cubic centimeter or more, as determined in a hot atmosphere having a temperature of 85°
C. at a frequency of 120 Hz and without an applied voltage, further wherein the ratio of the ESR of the ultracapacitor after being exposed to the hot atmosphere and an applied voltage of about 1 volt or more to the initial ESR of the ultracapacitor when exposed to the hot atmosphere but prior to being applied with the applied voltage is about 1.8 or less. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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Specification