US9460863B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9460863-B2 |
| Application number | US-201313866103-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 19, 2013 |
| Priority date | Apr 19, 2012 |
| Publication date | Oct 4, 2016 |
| Grant date | Oct 4, 2016 |
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An asymmetric supercapacitor is described. The supercapacitor includes a first electrode, a second electrode, a thin film separator, and an electrolyte. The first electrode comprises functionalized cellulose fiber and the second electrode comprises functionalized cellulose fiber and metal oxide.
Opening claim text (preview).
What is claimed: 1. An asymmetric supercapacitor comprising: a first electrode, a second electrode, a thin film separator, and an electrolyte, wherein the first electrode comprises functionalized cellulose fiber and the second electrode comprises functionalized cellulose fiber and a coating of nanostructured amorphous metal oxide on the functionalized cellulose fiber, the nanostructured metal oxide having a nanoflower morphology. 2. The supercapacitor of claim 1 , wherein the first electrode functionalized cellulose fiber is functionalized by chemical activation. 3. The supercapacitor of claim 1 , wherein the second electrode functionalized cellulose fiber is functionalized by chemical activation. 4. The supercapacitor of claim 1 , wherein the metal oxide comprises manganese oxide. 5. The supercapacitor of claim 1 , wherein the first electrode functionalized cellulose fiber forms at least part of a cotton substrate. 6. The supercapacitor of claim 1 , wherein the second electrode functionalized cellulosic fiber forms at least part of a cotton substrate. 7. The supercapacitor of claim 1 , wherein the thin film separator comprises cellulosic fiber. 8. The supercapacitor of claim 1 , wherein the electrolyte comprises an ionic liquid. 9. The supercapacitor of claim 1 , wherein the supercapacitor exhibits an energy density of 66.7 Wh/kg. 10. The supercapacitor of claim 1 , wherein the supercapacitor exhibits an energy density decrease of from 66.7 Wh/kg to 17.8 Wh/kg and a power density increase of from 0.8 kW/kg to 4.97 kW/kg as current density increases from 1 mA/cm 2 to 20 mA/cm 2 . 11. The supercapacitor of claim 1 , wherein the supercapacitor is configured to exhibit a specific capacitance of 269.5 F/g.
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