Back to results
US 9,318,273 B2Granted
High voltage EDLC electrodes containing CO2 activated coconut char
AssigneeCorning Incorporated
InventorsKishor Purushottam Gadkaree, Atul Kumar
Life of this patent
Estimating the term…
Abstract
A method for producing activated carbon includes heating a coconut shell 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.
Claims17
A method of forming activated carbon, comprising:
- carbonizing coconut shell material by heating the coconut shell material at a carbonization temperature effective to form a coconut char;
- and
- activating the coconut char to form activated carbon by heating the coconut char at an activation temperature while exposing the coconut char to carbon dioxide, 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 of ≧0.05 cm3/g;
- and
- <0.05 cm3/g combined pore volume of any pores having a size of >2 nm.
4 more elements
A method of forming activated carbon, comprising:
- carbonizing coconut shell material by heating the coconut shell material 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 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 of ≧0.05 cm3/g;
- and
- <0.25 cm3/g combined pore volume of any pores having a size of >2 nm,
- wherein the carbon material has an average particle size ranging from 1 to 10 microns prior to activation.
5 more elements
Dependencies are inferred from the claim text.