The effects of AlBr3, AlCl3, and alpha-Al2O3 on the conductivity and u
ltrastructure of electrolytes based on LiClO4 and polyethers have been
studied. The results obtained are analyzed in terms of Lewis acid-bas
e interactions occurring between various chemical moieties within thes
e composite systems. It is shown that aluminum halides form complexes
with ClO4- anion acting as plasticizing agents for polyether matrixes,
However, aluminum halides interact also with polyethers leading to th
e formation of polyether-aluminum halide complexes, thus stiffening po
lymeric electrolytes, It is shown that for low additive concentrations
the addition of Lewis acid results in a decrease in the degree of cry
stallinity of poly(ethylene oxide)-based electrolytes; this is followe
d by an increase in the conductivity. A significant increase in conduc
tivity was obtained at 0 and 25 degrees C for samples containing up to
25 mass % of aluminum halides or alpha-Al2O3. For samples containing
more than 30 mass % of the additive, the effect of the stiffening of p
olymer hosts dominates(and is confirmed by the increase in T-g values
observed from DSC experiments) and the conductivity decreases.