engleski

Study of Polymer Electrolyte for Zn Rechargeable Nanostructured Galvanic Cells via Combined in Situ SAXS/DSC/WAXD Measurements

Small-angle X-ray scattering (SAXS) experiments are suitable to determine the microstructure of nanocomposite polymer electrolyte. Solid electrolyte poly(ethylene oxide) (PEO) is one of the most extensively studied systems due to its relatively low melting point and Tg, its ability to play host to varied metal salt systems in a range of concentrations and to act as a binder for other phases. The objective is to study morphology and crystallization/temperature kinetics of polymer electrolyte (PEO)8ZnCl2, nanocomposite via combined DSC-SAXS-WAXD techniques in the temperature range from 0oC to 100 oC. We intend to improve the electrical conductivity of polymer electrolyte (PEO)8ZnCl2 by introducing nano-particles of TiO2, ZnO, Al2O3, MgO2 and V2O5. An alternative approach is tobring about interchain linking by exposure of the polymer to high-energy radiation. As polymer is a composite of an amorphous and acrystalline part and conductivity is occurring in the amorphous part, both treatments were directed towards inhibition of thecrystalline phase in the polymer matrix. TXRD/TSAXS was performed in order to determine and understand crystallographic changes of nano-grains through the super ionic phase transition of polymer electrolyte. It will allow us to obtain insight to the microscopic mechanism of ionic transport in nanocomposite polymer electrolyte. This becomes even more important now, when a considerable charge transfer and high conductivity in crystalline morphologies of PEO based polymer electrolytes is observed and explained by hopping mechanism of ions throughout free crystalographically permitted places. Given the relatively low contrast a high intensity synchrotron beam is crucial for the success of the experiment, and the necessity of obtaining the information about the details of the positioning of the nanoparticles introduced into the polymer calls for the use of a highly collimated beam, as the one at the ELETTRA SAXS beam-line.

solid electrolyte; polyethylene oxide; WAXS; DSC; SAXS

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