Carbon for high voltage EDLCs
AssigneeCorning Incorporated
InventorsKishor Purushottam Gadkaree, Andrew Fleitz Husted, Xiaorong Liu
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Abstract
A method for producing activated carbon includes heating a phenolic novolac resin carbon precursor at a carbonization temperature effective to form a carbon material, and reacting the carbon material with CO2 at an activation temperature effective to form the activated carbon. The resulting activated carbon can be incorporated into a carbon-based electrode of an EDLC. Such EDLC can exhibit a potential window and thus an attendant operating voltage of greater than 3V.
Claims20
A method of forming activated carbon, comprising:
- carbonizing a carbon precursor by heating the carbon precursor at a carbonization temperature effective to form a carbon material;
- and
- activating the carbon material by heating the carbon material at an activation temperature while exposing the carbon material to carbon dioxide,
- wherein the carbon precursor comprises phenolic novolac resin, and
- wherein the activated carbon comprises:
- pores having a size of ≦1 nm, which provide a combined pore volume of ≧0.2 cm3/g;
- pores having a size of from >1 nm to ≦2 nm, which provide a combined pore volume ranging from 0.05 to 0.25 cm3/g;
- and
- <0.20 cm3/g combined pore volume of any pores having a size of >2 nm.
Activated carbon derived from phenolic novolac resin, said activated carbon comprising:
- pores having a size of ≦1 nm, which provide a combined pore volume of ≧0.2 cm3/g;
- pores having a size of from >1 nm to ≦2 nm, which provide a combined pore volume ranging from 0.05 to 0.25 cm3/g;
- and
- <0.2 cm3/g combined pore volume of any pores having a size of >2 nm.
Activated carbon comprising:
- pores having a size of ≦1 nm, which provide a combined pore volume of ≧0.2 cm3/g;
- pores having a size of from >1 nm to ≦2 nm, which provide a combined pore volume ranging from 0.05 to 0.25 cm3/g;
- and
- <0.2 cm3/g combined pore volume of any pores having a size of >2 nm.
Dependencies are inferred from the claim text.