Ultracapacitor With Improved Aging Performance
AssigneeCorning Incorporated
InventorsKishor Purushottam Gadkaree, Kamjula Pattabhirami Reddy
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Abstract
An electric double layer capacitor comprises first and second electrodes, each comprising respective first and second carbon materials having distinct pore size distributions. A pore volume ratio of the first carbon material is greater than a pore volume ratio of the second carbon material. The pore volume ratio R is defined as R=V1/V, where V1 is a total volume of pores having a pore size of less than 1 nm, and V is a total volume of pores having a pore size greater than 1 nm.
Claims15
An electric double layer capacitor comprising:
- a first electrode comprising a first carbon material and a second electrode comprising a second carbon material, wherein
- a pore volume ratio of the first carbon material is greater than a pore volume ratio of the second carbon material, the pore volume ratio R being defined as R=V1N, where V1 is a total volume of pores having a pore size of less than 1 nm, and V is a total volume of pores having a pore size greater than 1 nm.
A positive electrode for an electric double layer capacitor comprising a first carbon material wherein a pore volume ratio of the first carbon material is greater than 1, the pore volume ratio R being defined as R=V1/V, where V1 is a total volume of pores having a pore size of less than 1 nm, and V is a total volume of pores having a pore size greater than 1 nm.
A negative electrode for an electric double layer capacitor comprising a second carbon material wherein a pore volume ratio of the second carbon material is less than 1, the pore volume ratio R being defined as R=V1/V, where V1 is a total volume of pores having a pore size of less than 1 nm, and V is a total volume of pores having a pore size greater than 1 nm.
A method of making an electric double layer capacitor comprising:
- forming a first carbon-based electrode having a first carbon material;
- forming a second carbon-based electrode having a second carbon material;
- and
- incorporating the first and second carbon-based electrodes into an electric double layer capacitor, wherein
- a pore volume ratio of the first carbon material is greater than a pore volume ratio of the second carbon material, the pore volume ratio R being defined as R=V1N, where V1 is a total volume of pores having a pore size of less than 1 nm, and V is a total volume of pores having a pore size greater than 1 nm.
Dependencies are inferred from the claim text.