Frequency dependent conductivity studies on PMMA-LiCF3SO3 polymer electrolytes

• Published in: Materials research innovations 2009-09, Vol.13 (3), p.285-287
• Main Authors: Ali, A. M. M., Bahron, H., Subban, R. H. Y., Kudin, T. I. T., Yahya, M. Z. A.
• Format: Article
• Language: English
• Subjects: AC CONDUCTIVITY; DIELECTRIC BEHAVIOUR; ELECTRIC MODULI; PMMA
• ISSN: 1432-8917; 1433-075X
• DOI: 10.1179/143307509X440541

Polymer electrolytes composed of poly(methylmethacrylate) as a host polymer and lithium triflate as a salt have been prepared by solution cast technique. Polymer salt complexation has been confirmed by attenuated total reflectance Fourier transform infrared spectral studies. The ac conductivity as a function of temperatures in the frequency range 100 Hz-1 MHz has been carried out. The conductivity-temperature plots found follows the Arrhenius rule. The complex permittivity ϵ* and complex electric modulus M* have been analysed. The dispersion observe at low frequency is due to the space charge effect arising from the electrodes. The modulus spectra reveal that the dispersion deviates from the Debye behaviour. The ionic conductivity relaxation is determined from the maximum of the peaks of the dielectric loss modulus associated with the ac activation energy for ion relaxation E fp =0·337 eV, which agrees well with the dc conduction activation energy E A =0·341 eV. Thus, it is suggested that the dynamic mechanism for the ionic conduction is achieved at the same energy barrier while conducting as well as relaxing.