Solid State Science and Technology, Vol. 17, No 2 (2009) 65-74

ISSN 0128-7389

Corresponding Author: rihanum43@salam.uitm.edu.my

65

DIELECTRIC BEHAVIOURS OF PLASTICIZED PEO-LiCF3SO3

ELECTROLYTES

S.Zaubidah Abdullah, Azean Abdullah, Tan Winie and R.H.Y. Subban.

Faculty of Applied Sciences, Universiti Teknologi MARA,

40450 Shah Alam, Selangor, Malaysia

 

ABSTRACT

Films of PEO-based polymer electrolyte were prepared by the technique of solution casting. Ethylene carbonate (EC) was employed as the plasticizer and lithium trifluoromethanesulfonate (LiCF3SO3) was used as the doping salt. The highest room temperature conductivity achieved in EC-plasticized system is 2.14 x 10-4 S cm-1. The effects of EC on the frequency-dependent dielectric properties of PEO-based electrolytes were also investigated by impedance spectroscopy, in the temperature range from 300 K to 343 K. The relaxation time for the ionic charge carriers, τ was obtained from the variation of loss tangent, tan δ as a function of frequency at various temperatures for sample with highest conductivity value. The linear behaviour of temperature dependence of τ with regression value 0.98 could be described by Arrhenius law. The activation energy for the plasticized PEO-LiCF3SO3 sample was found to be 0.39 eV.

 

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