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Atypical behaviors of BMIMTf ionic liquid present in ionic conductivity, SEM, and TG/DTG analyses of P(VdF-HFP)/LiTf-based solid polymer electrolyte system

Published online by Cambridge University Press:  08 November 2011

S. Ramesh  and
Soon-Chien Lu
S. Ramesh*
Affiliation:
Centre for Ionics, Department of Physics, Faculty of Science, Centre for Ionics, University of Malaya, 50603 Kuala Lumpur, Malaysia
Soon-Chien Lu
Affiliation:
Centre for Surface Chemistry and Catalysis, Faculty of Bioengineering Science, Katholieke Universiteit Leuven, 3001 Leuven, Belgium
*
a)Address all correspondence to this author. e-mail: rameshtsubra@gmail.com
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Abstract

Solid polymer electrolytes (SPEs) with poly(vinylidene fluoride-hexafluoropropylene) [P(VdF-HFP)] as polymer host, doped with lithium trifluoromethanesulfonate (LiTf) and 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIMTf) have been synthesized via solution casting method. This P(VdF-HFP)/LiTf/BMIMTf-based SPE achieves ∼2.4 × 10−3 and ∼1.1 × 10−2 S·cm−1 at 30 and 80 °C, respectively, with 100 part by weight of BMIMTf incorporated into the system. A very interesting trend of temperature-dependence ionic conductivity has been obtained. A rationalization of the trend is given and the morphological changes observed in scanning electron micrographs seem to be commensurate with it. Thermogravimetric and differential thermogravimetric analyses reveal some changes in thermal properties of the SPEs, including the possibility of phase separation happening in the sample.

Keywords

Electrical propertiesScanning electron microscopyPolymer
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 23 , 14 December 2011 , pp. 2945 - 2951
Copyright
Copyright © Materials Research Society 2011

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