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True Performance Metrics in Electrochemical Energy Storage

Gogotsi, Yury and Simon, Patrice True Performance Metrics in Electrochemical Energy Storage. (2011) Science Magazine , vol. 334 (n° 6058). pp. 917-918. ISSN 0036-8075

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Official URL: http://dx.doi.org/10.1126/science.1213003

Abstract

A dramatic expansion of research in the area of electrochemical energy storage (EES) during the past decade has been driven by the demand for EES in handheld electronic devices, transportation, and storage of renewable energy for the power grid (1–3). However, the outstanding properties reported for new electrode materials may not necessarily be applicable to performance of electrochemical capacitors (ECs). These devices, also called supercapacitors or ultra-capacitors (4), store charge with ions from solution at charged porous electrodes. Unlike batteries, which store large amounts of energy but deliver it slowly, ECs can deliver energy faster (develop high power), but only for a short time. However, recent work has claimed energy densities for ECs approaching (5) or even exceeding that of batteries. We show that even when some metrics seem to support these claims, actual device performance may be rather mediocre. We will focus here on ECs, but these considerations also apply to lithium (Li)—ion batteries.

Item Type:Article
Additional Information:Thanks to American Association for the Advancement of Science editor. The definitive version is available at http://www.sciencemag.org/content/334/6058/917
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Drexel University (USA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Denis Faragou

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