Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 2, Issue 19, Pages 2396-2401Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz201065t
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Funding
- Solvionic
- U.S. National Science Foundation [0924570]
- Alexander von Humboldt Foundation
- Partner University
- EC
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0924570] Funding Source: National Science Foundation
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Relying on redox reactions, most batteries are limited in their ability to operate at very low or very high temperatures. While performance of electrochemical capacitors is less dependent on the temperature, present-day devices still cannot cover the entire range needed for automotive and electronics applications under a variety of environmental conditions. We show that the right combination of the exohedral nanostructured carbon (nanotubes and onions) electrode and a eutectic mixture of ionic liquids can dramatically extend the temperature range of electrical energy storage, thus defying the conventional wisdom that ionic liquids can only be used as electrolytes above room temperature. We demonstrate electrical double layer capacitors able to operate from -50 to 100 degrees C over a wide voltage window (up to 3.7 V) and at very high charge/discharge rates of up to 20 V/s. SECTION: Energy Conversion and Storage
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