High voltage edlc electrodes containing co2 activated coconut char
AssigneeCorning Incorporated
InventorsKishor Purushottam Gadkaree, Atul Kumar
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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.
Claims21
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.
An electrochemical double layer having a potential window of greater than 3V.
Activated carbon derived from the CO2 activation of coconut shells, 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 of ≧0.05 cm3/g;
- and
- <0.25 cm3/g combined pore volume of any pores having a size of >2 nm.
Dependencies are inferred from the claim text.