The addition of inert filler are known to increase the mechanical properties of polymer electrolytes in their conductive amorphous phase. So the addition of a-A1203 to PEO-LiC104 complexes produced a significant improvement in the mechanical stability of the material at temperatures in excess of 100 "C. This improvement was explained assuming that the ceramic dispersoid act as a filler providing a supporting matrix for the conductive amorphous polymer complex, so as to retain an overall solid structure even at high temperature. In this paper, thermal, electrical and spectroscopic characterization results all support a structural model which accounts for the effects exerted by finely dispersed ceramic additives on the trasnport properties of PEO-based polymer electrolytes. The addition of the dispersoid prevents the agglomeration of the polymer chain to form extended coiled crystalline clusters. While maintaining an overall rigid structure, these electrolytes assume structural and transport properties comparable to those of systems based on ow-molecular weight poly(ethy1ene glycol)-lithium salt solutions, which are currently used to mimic low-crystallinity polymer electrolytes.
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