Configurational entropy effect for the conductivity of semicrystalline polymer/salt systems

The ionic conductivity of poly(ethylene oxide)(PEO)-based Zn(parallel to) h alide electrolytes has been investigated at various temperatures and compos itions by AC impedance analysis. To interpret the experimental results, we propose a model based on the Adam-Gibbs configurational entropy model and t he extended Flory's configurational entropy. Correlating the phase behavior and the ionic conductivity simultaneously is a good approach for understan ding the polymer/salt systems. The maximum in conductivity does not occur o n the eutectic composition (weight fraction of ZnBr2 = 0.15), but is slight ly shifted to the salt rich region for the PEO/ZnBr2 system. The quantitati ve description according to the proposed model is in good agreement with th e experimental data. (C) 1999 Elsevier Science B.V. All rights reserved.