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Morphology and crystallization kinetics of solid polymer electrolyte for Zn rechargeable nanostructured galvanic cells via combined synchrotrone SAXS-DSC techniques

(PEO)8ZnCl2 polymer electrolytes and nano-composites were prepared using PEO  -irradiated to selected doses and TiO2 nanograins. These materials can be considered as aggregates containing nanoparticles or nanograins [1-15]. In this case, the SAXS is caused by the difference of electron density within and around the nanoparticles. Using the Guinier approximation (the scattering in the very small angle range is of Gaussian form, independent of the shape of the present particles) the sizes can be readily determined. The influence of added nanosize TiO2 grains to polymer electrolytes and the effect of   -radiation from a Co-60 source were studied by small-angle X-ray scattering (SAXS) simultaneously recorded with differential scanning calorimetry (DSC) at synchrotron ELETTRA. Infrared (IR) and impedance spectroscopy (IS) were also performed. Above-mentioned treatments largely enhanced the conductivity of polymer electrolyte. Room temperature conductivity increase up to two orders of magnitude was achieved. Addition of nanograins increased conductivity more than can be ascribed to crystallinity possibly because of interactions of anion with nanograins. Galvanic cells Zn/(PEO)8ZnCl2/[V2O5-CeO2 (at 38 at. % of V)] ; SnO2:F have been formed (16).

polymer electrolyte; SAXS-DSC

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