4.7 Article Proceedings Paper

Good prospect of ionic liquid based-poly(vinyl alcohol) polymer electrolytes for supercapacitors with excellent electrical, electrochemical and thermal properties

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 6, Pages 2953-2963

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.06.061

Keywords

PVA; Ionic liquid; Polymer electrolyte; Supercapacitor; Specific capacitance

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Poly(vinyl alcohol) (PVA)/ammonium acetate (CH3COONH4)/1-butyl-3-methylimi dazolium chloride (BmImCl) based polymer electrolytes were prepared by solution casting method. The ionic conductivity increased with temperature as shown in temperature dependent-ionic conductivity study. The maximum ionic conductivity of (7.31 +/- 0.01) mS cm(-1) was achieved at 120 degrees C upon adulteration of 50 wt% of BmImCl. The samples obeyed Vogel-Tamman-Fulcher (VTF) relationship. The glass transition temperature (T-g) of the polymer matrix was reduced by doping it with salt and ionic liquid as shown in differential scanning calorimetry (DSC). Supercapacitor was thus assembled. Wider potential stability range has been observed with addition of ionic liquid. Inclusion of ionic liquid also improved the electrochemical behavior of EDLC. The capacitance of supercapacitor were determined by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge tester. The cell also illustrated energy density of 2.39 Wh kg(-1) and power density of 19.79W kg(-1) with Coulombic efficiency above 90%. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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