Abstract
Impedance spectroscopy and differential scanning calorimetry studies have been performed for mixed-alkali systems of [(1- x)LiClO 4 + xMClO 4](PEO) 16 complexes (M = K, NH 4) with varying concentrations of x. At high temperatures above the melting temperature ( T m of poly(ethylene oxide) (PEO), the ionic conductivity exhibits no mixed-salt effect, revealing that there are no cation-cation interference effects as in the mixed-alkali glasses, in which a great reduction of the conductivity has been observed. However, the properties related to the phase formation exhibit the mixed-salt effect, showing a negative deviation of T m from additivity, the appearance of low-melting crystalline complexes and an increase in crystallinity. Hence, the conductivity below T m, which is directly related to the phase formation at ambient temperature, shows a small negative deviation from additivity, especially for Li + /NH 4 + systems. The conductivity changes due to mixing salts are discussed by two terms, i.e., changes in the crystallinity and in the polymer segmental motion.
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