Pitawala, H. M. J. C. and Dissanayake, M. A. K. L. and Seneviratne, V. A. and Mellander, B. E. and Albinsson, I. (2008) Effect of Nano-Porous Alumina Filler on Thermal and Electrical Transport Properties of Solid Polymer Electrolyte (PEO)(12)LiBF4. SMART MATERIALS, 55-57 . pp. 745-748. ISSN 1022-6680
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Ionic conductivity, dielectric and thermal properties of (PEO)(12)LiBF4 solid polymer electrolyte. dispersed with nanoporous Al2O3 have been studied. Out of seven different Compositions Studied. the (PEO)(12)LiBF4 polymer-salt complex showed the highest conductivity with sigma(25) degrees c = 8.27 x 10(-6) S cm(-1). Dispersion of different weight ratio of nano-porous alumina fillers to this electrolyte showed that the composite electrolyte composition with 15 wt. % Al2O3 gave the highest conductivity with sigma(25) degrees c = 6.05 x 10(-5) S cm(-1). The, glass transition temperature, T-g decreased from -35.3 degrees C to -43.2 degrees C and the PEO crystallite inciting temperature, T-m decreased from 64.5 degrees C to 58.8 degrees C due to the incorporation of 15 wt. % Al2O3 filler, suggesting that the interaction between the PEO backbone and the Al2O3 filler have affected the main chain dynamics of the host polymer. As the presence of the filler results in all increased conductivity mainly due to all increased amount of amorphous phase in the electrolyte above T-m, another mechanism, directly associated with the Filler particles. appears to contribute to the observed conductivity enhancement. A possible mechanism for this could be the creation of additional hopping sites and favorable conducting pathway's for migrating ionic species though Lewis acid-base type interactions between ionic species and O/OH sites oil the filler grain surface. Results of the dielectric relaxation spectroscopy agree with the suggestion that the increased mobility is largely responsible for the obtained conductivity enhancement caused by the nano- porous filler.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||28 Oct 2009 05:21|
|Last Modified:||28 Oct 2009 05:21|
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