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vibrational study of the crystalline phases in (PEO)8ZnCl2 nanocomposite electrolyte

The ability of poly(ethylene oxide), PEO to form crystalline complexes with a variety of salts has provided a number of novel compounds in which to examine fundamental questions of structure and coordination. Addressing these fundamental questions has practical implications as well, because insight into cation-polymer and cation-anioun interactions is critical to understanding the microscopic mechanism of ionic transport in polymer electrolytes. The interaction of the cation with the polymer is especially important because the transport of ions in the amorphous phase of PEO-based electrolytes appears to be dynamically coupled to the segmental motion of the host polymer. In this work we shall study electrolyte from polymer-salt compounds based on ZnCl2. Polymer electrolyte (PEO)8ZnCl2 has been prepared by sol-gel procedure. Goal was to implement it as electrolyte in rechargeable galvanic cell with nanostructured metal oxide electrodes. Nanocomposite polymer electrolyte was formed by adding 25 nm sized TiO2 grains during the preparation procedure. The influence of added nanosize TiO2 grains to polymer electrolyte was studied by comparative vibrational spectroscopic study of IR and Raman measurements.

poly(ethylene oxide); nanocomposite electrolyte; FTIR; Raman spectroscopy

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