Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 205, Issue -, Pages 6-17Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2015.11.009
Keywords
Polymer blend; Salt concentration; AC-impedance spectroscopy; Cyclic voltammetry; Thermal stability
Funding
- UGC-BSR, New Delhi, India
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Poly(ethylene oxide) (PEO) 6.25 wt%/poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdF-HFP)] 18.75 wt% blend based electrolyte films containing different concentrations (2-10) wt% of lithium salt were prepared. The miscibility studies have been performed by using X-ray diffraction and Fourier transform infrared spectroscopy. The role of interaction between polymer hosts on conductivity is discussed using the results of a.c. impedance studies. A room temperature conductivity of 2.3912 x 10(-4) S cm(-1) has been obtained for PEO (6.25)-PVdF-HFP (18.75)-LiClO4 (8)-PC (67) polymer complex. The temperature dependence of the conductivity of polymer electrolyte seems to obey VTF relation. Electrochemical stability (3.3 V) was observed in the prepared polymer electrolyte. Reduction process and oxidation process of the prepared electrolyte system have also been evaluated by means of cyclic voltammetry. Thermogravimetric analysis results indicate thermal stability of PEO/PVdF-HFP lithium salt complexes. Roughness parameter of the sample having maximum ionic conductivity was studied by AFM. The morphology of the polymer complex is investigated by using SEM. (C) 2015 Elsevier B.V. All rights reserved.
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