Back to results
US 8,541,338 B2Granted
Highly porous activated carbon with controlled oxygen content
AssigneeCorning Incorporated
InventorsKishor Purushottam Gadkaree, Jia Liu
Life of this patent
Estimating the term…
Abstract
Nanoporous activated carbon material having a high specific capacitance in EDLCs and controlled oxygen content, and methods for making such activated carbon material. Reduction of oxygen content is achieved by (a) curing a carbon precursor/additive mixture in an inert or reducing environment, and/or (b) refining (heating) activated carbon material after synthesis in an inert or reducing environment. The inert or reducing environment used for curing or refining is preferably substantially free of oxygen.
Claims9
A method of forming a porous activated carbon material having controlled oxygen content, comprising:
- forming a mixture of a carbon precursor selected from the group consisting of a synthetic polymer thermosetting resin and a synthetic polymer thermoplastic resin and an inorganic compound selected from the group consisting of KOH, K2CO3, KCl, NaOH, Na2CO3, NaCl, P2O5, AlCl3, MgCl2, ZnCl2 and H3PO4;
- heating the mixture at a first temperature to cure the carbon precursor;
- heating the cured carbon precursor at a second temperature higher than the first temperature to carbonize the carbon precursor and produce an activated carbon material, wherein the method further comprises:
- (a) heating the mixture at the first temperature in a nitrogen environment, and
- (b) washing the activated carbon to remove the inorganic compound and then heating the washed activated carbon material at a third temperature ranging from about 450° C. to 1000° C. in an environment that is substantially free of oxygen to refine the activated carbon material.
2 more elements
Dependencies are inferred from the claim text.