Charging mechanism and moving reaction fronts in a supercapacitor with pseudocapacitance

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DOIResolve DOI: http://doi.org/10.1149/2.018403jes
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TypeArticle
Journal titleJournal of the Electrochemical Society
ISSN0013-4651
Volume161
Issue3
PagesA239A246
SubjectAsymmetric broadening; Charging energies; Charging mechanism; Cyclic voltammograms; High power density; Moving reaction fronts; Pseudocapacitance; Super capacitor; Charging (batteries); Electric charge; Electrolytic capacitors; Loading
AbstractA model of a supercapacitor with pseudocapacitance focusing on effects along the thickness of the electrode was developed. Fast charging, i.e. high power density operation, was analyzed. The occurrence of moving reaction fronts under these conditions is found and discussed. Indicators of the occurrence of moving reaction fronts were defined by analyzing the reaction front velocity and deriving the reaction penetration depth. Effects of the moving reaction fronts on cyclic voltammograms were simulated and an asymmetric broadening of the oxidation peak was found. The influence of the moving reaction fronts on the performance of the supercapacitor was investigated by means of charging energy analysis. Losses were found mainly at the end of the oxidation phase. Partial charging under fast charging conditions reduces the losses. The scale-up of the electrode mass loading and thus the influence of the thickness was analyzed. Simulation results could be used as an "operation map" to avoid conditions with significant losses. © 2013 The Electrochemical Society. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21272203
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Record identifiereab2dc2a-8d9f-4dc2-ae21-cc96e87d66e0
Record created2014-07-23
Record modified2016-05-09
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