Process for producing carbon foams for energy storage devices
First Claim
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1. A process for producing high density carbon foam, selected from the group of aerogel carbon foam, xerogel carbon foam and xerogel-aerogel carbon foam, having a density of above 0.3 g/cc and up to about 1.2 g/cc, and having a surface area of over 300 m2 /g to about 1200 m2 /g, including the steps of:
- forming a mixture from at least one mole of resorcinol or catechol and two moles of formaldehyde in the presence of a basic catalyst, and with a mole ratio of resorcinol or catechol to catalyst of 50-400;
forming an aquagel from the thus formed mixture; and
drying the thus formed aquagel.
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Abstract
A high energy density capacitor incorporating a variety of carbon foam electrodes is described. The foams, derived from the pyrolysis of resorcinol-formaldehyde and related polymers, are high density (0.1 g/cc-1.0 g/cc) electrically conductive and have high surface areas (400 m2 /g-1000 m2 /g). Capacitances on the order of several tens of farad per gram of electrode are achieved.
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14 Claims
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1. A process for producing high density carbon foam, selected from the group of aerogel carbon foam, xerogel carbon foam and xerogel-aerogel carbon foam, having a density of above 0.3 g/cc and up to about 1.2 g/cc, and having a surface area of over 300 m2 /g to about 1200 m2 /g, including the steps of:
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forming a mixture from at least one mole of resorcinol or catechol and two moles of formaldehyde in the presence of a basic catalyst, and with a mole ratio of resorcinol or catechol to catalyst of 50-400; forming an aquagel from the thus formed mixture; and drying the thus formed aquagel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification