Ionic conductivity enhancement studies of composite polymer electrolyte based on poly (vinyl alcohol)-lithium perchlorate-titanium oxide
Chin-Shen. Lim1, K. H. Teoh1, H. M. Ng1*, Chiam-Wen Liew2, S. Ramesh1*
1Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia
2School of Foundation Studies, Xiamen University Malaysia Campus, Jalan Suria Serenia 1, Bandar Serenia, Sepang, Selangor Darul Ehsan, 43900, Malaysia
Adv. Mater. Lett., 2017, 8 (4), pp 465-471
Publication Date (Web): Mar 14, 2017
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In this study, poly (vinyl alcohol) (PVA), lithium perchlorate (LiClO4) and nano-sized titanium oxide (TiO2) were employed as host polymer, dopant salt and inorganic filler respectively. The influence of the inorganic filler on ionic conductivity, structural and morphological properties of the polymer matrix are investigated. Ionic conductivity of polymer electrolytes is measured by ac-impedance spectroscopy at ambient temperature. The polymer electrolyte exhibits the highest ionic conductivity of 1.26×10-4 S cm-1 upon addition of 8 wt. % TiO2. Dielectric behavior proves that incorporation of nano-sized TiO2 particles shows a significant effect on the dielectric constant of the polymer electrolyte system. XRD analyses disclose that the addition of TiO2 reduces the crystallinity of the polymer electrolytes which enhances the flexibility of polymer chains.
Dielectric constant, titanium oxide, ionic conductivity, loss tangent.