Abstract
Improvement of electrical conductivity of poly ethylene oxide (PEO)–LiI polymer electrolytes is necessary for their use in solid state lithium ion battery. In this study a new kind of PEO–LiI-based polymer electrolytes embedded with CdO nanoparticles with improved electrical conductivity has been prepared and characterized. The electron microscopic studies confirm that CdO nanoparticles of average size 2.5 nm are dispersed in the PEO matrix. The glass transition temperature of the PEO–LiI electrolyte decreases with the introduction of CdO nanoparticle in the polymer matrix. X-ray diffraction, electron microscopic, and differential scanning calorimetry studies show that the amorphous phase of PEO increases with the introduction of CdO nanoparticle and that the increase in amorphous phase is maximum for 0.10 wt% CdO doping. The electrical conductivity of the sample with 0.10 wt% CdO increases by three orders in magnitude than that of the PEO–LiI electrolyte. The electrical conductivity of PEO–LiI electrolyte embedded with CdO nanoparticle exhibits VTF behavior with reciprocal temperature indicating a strong coupling between the ionic and the polymer chain segmental motions.
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Acknowledgments
One (AK) of the authors acknowledges the Council of Scientific and Industrial Research, Government of India, for providing him research fellowship (via Grant no. 09/080(0573)/2007-EMR-I) for the work. The support by the Department of Science and Technology, Government of India through its nanoscience initiative program is also thankfully acknowledged.
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Karmakar, A., Ghosh, A. Poly ethylene oxide (PEO)–LiI polymer electrolytes embedded with CdO nanoparticles. J Nanopart Res 13, 2989–2996 (2011). https://doi.org/10.1007/s11051-010-0194-x
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DOI: https://doi.org/10.1007/s11051-010-0194-x