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The effects of temperature on the performance of electrochemical double layer capacitors

Fletcher, S. I. and Sillars, F. B. and Carter, R. C. and Cruden, A. J. and Mirzaeian, M. and Hudson, N. E. and Parkinson, J. A. and Hall, P. J. and Hall, Peter (2010) The effects of temperature on the performance of electrochemical double layer capacitors. Journal of Power Sources, 195 (21). pp. 7484-7488. ISSN 0378-7753

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Abstract

An electrochemical double layer capacitor test cell containing activated carbon xerogel electrodes and ionic liquid electrolyte was tested at 15, 25 and 40 degrees C to examine the effect of temperature on electrolyte resistance (R-S) and equivalent series resistance (ESR) measured using impedance spectroscopy and capacitance using charge/discharge cycling. A commercial 10 F capacitor was used as a comparison. Viscosity, ionic self-diffusion coefficients and differential scanning calorimetry measurements were used to provide an insight into the behaviour of the 1,2-dimethy1-3-propylimdazolium electrolyte. Both R-S and ESR decreased with increasing temperature for both capacitors. Increasing the temperature also increased the capacitance for both the test cell and the commercial capacitor but proportionally more for the test cell. An increase in temperature decreased the ionic liquid electrolyte viscosity and increased the self-diffusion coefficients of both the anion and the cation indicating an increase in dissociation and increase in ionic mobility. (C) 2010 Elsevier B.V. All rights reserved.

Item type: Article
ID code: 31657
Keywords: electrochemical double layer capacitor, Ionic liquid, temperature effects, ionic liquids, electrolytes, Chemical engineering, Energy Engineering and Power Technology, Physical and Theoretical Chemistry, Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment
Subjects: Technology > Chemical engineering
Department: Faculty of Engineering > Chemical and Process Engineering
Faculty of Engineering > Electronic and Electrical Engineering
Faculty of Science > Pure and Applied Chemistry
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 15 Jun 2011 14:30
Last modified: 27 Mar 2014 09:25
URI: http://strathprints.strath.ac.uk/id/eprint/31657

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