Percolation Threshold and Conductivity of Polymer Electrolyte Composites: Effect of Dispersoid Particle Size

摘要

Silica particles of different diameters (0.007, 0.014, and 44 μm) have been dispersed in polymer electrolyte (PE0:NH4l) to form composites, and their electrical and thermal behavior have been studied. This article reports the occurrence of two peaks in the plot of conductivity as a function of the amount of dispersoid (SiO2). Further, it is shown that the percolation threshold and the extent of maximum conductivity enhancement in the composites depend on the particle size of the dispersoid. The role of degree of crystallinity/amorphicity of the composites in modifying the conductivity of the composites has also been discussed and a phenomenological explanation is being proposed.