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High-rate electrochemical energy storage through Li+ intercalation pseudocapacitance

Augustyn, Veronica and Come, Jérémy and Lowe, Michael A. and Kim, Jong Woung and Taberna, Pierre-Louis and Tolbert, Sarah H. and Abruña, Héctor D. and Simon, Patrice and Dunn, Bruce High-rate electrochemical energy storage through Li+ intercalation pseudocapacitance. (2013) Nature Materials, 12 (6). 518-522. ISSN 1476-1122

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Official URL: http://dx.doi.org/10.1038/NMAT3601

Abstract

Pseudocapacitance is commonly associated with surface or near-surface reversible redox reactions, as observed with RuO2·xH2O in an acidic electrolyte. However, we recently demonstrated that a pseudocapacitive mechanism occurs when lithium ions are inserted into mesoporous and nanocrystal films of orthorhombic Nb2O5 (T-Nb2O5; refs 1, 2). Here, we quantify the kinetics of charge storage in T-Nb2O5: currents that vary inversely with time, charge-storage capacity that is mostly independent of rate, and redox peaks that exhibit small voltage offsets even at high rates. We also define the structural characteristics necessary for this process, termed intercalation pseudocapacitance, which are a crystalline network that offers two-dimensional transport pathways and little structural change on intercalation. The principal benefit realized from intercalation pseudocapacitance is that high levels of charge storage are achieved within short periods of time because there are no limitations from solid-state diffusion. Thick electrodes (up to 40 μm thick) prepared with T-Nb2O5 offer the promise of exploiting intercalation pseudocapacitance to obtain high-rate charge-storage devices.

Item Type:Article
Additional Information:Thanks to Nature Publishing Group. The definitive version is available at http://www.nature.com The original PDF of the article can be found at Nature Materials website : http://www.nature.com/nmat/journal/v12/n6/full/nmat3601.html
HAL Id:hal-01159902
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Cornell University (USA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Réseau de stockage électrochimique de l’énergie - Energie RS2E (FRANCE)
Other partners > University of California-Los Angeles - UCLA (USA)
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European Research Council
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Deposited By: cirimat webmestre
Deposited On:04 Jun 2015 08:04

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