Capacitive Energy Storage from - 50o to 100o Using an Ionic Liquid Electrolyte
- Universite Paul Sabatier, Toulouse Cedex, France.
- SOLVIONIC Company, Toulouse, France
- ORNL
- Drexel University
- AIXTRON, Cambridge, UK
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 C over a wide voltage window (up to 3.7 V) and at very high charge/discharge rates of up to 20 V/s.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1033179
- Journal Information:
- Journal of Physical Chemistry Letters, Vol. 2, Issue 19; ISSN 1948-7185
- Country of Publication:
- United States
- Language:
- English
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