Optimization of hybrid polymer electrolytes with the effect of lithium salt concentration in PEO/PVdF-HFP blends

•Polymer blends based on PVdF-HFP/PEO were prepared for Li-ion battery applications.•Structural and electrochemical studies were carried out on prepared electrolytes.•The electrolytes can be used as electrolyte in the possible device fabrications. Poly(ethylene oxide) (PEO) 6.25wt%/poly(vinylidene f...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2016-03, Vol.205, p.6-17
Main Authors: Pradeepa, P., Edwin raj, S., Sowmya, G., Kalaiselvimary, J., Ramesh Prabhu, M.
Format: Article
Language:English
Subjects:
AC-impedance spectroscopy
Blends
Cyclic voltammetry
Electrolytes
Lithium
Materials science
Polymer blend
Polymer blends
Reduction (electrolytic)
Roughness
Salt concentration
Thermal conductivity
Thermal stability
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Summary:•Polymer blends based on PVdF-HFP/PEO were prepared for Li-ion battery applications.•Structural and electrochemical studies were carried out on prepared electrolytes.•The electrolytes can be used as electrolyte in the possible device fabrications. Poly(ethylene oxide) (PEO) 6.25wt%/poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdF-HFP)] 18.75wt% 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 2.3912×10−4Scm−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 (3.3V) 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.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2015.11.009