Conductivity in polymer ionics. Dynamic disorder and correlation

摘要: Theoretical constructs are developed for discussing diffusivity and conductivity in polymer ionic materials. Such materials characterized by extensive disorder, either static (lack of long-range order) or dynamic order with short-range evolving time). Beginning a percolation model, we show that, general, so long as the mean-square displacement charged particle obeys certain growth law, observed charged-particle motion will be diffusive, both ballistic regime, corresponding to electronic strong scattering, ionic-hopping disorder renewal hopping situation. Some general behaviour transport under these conditions is predicted, including definite statements about frequency dependence conduction, relationship between law single interval observation times compared scattering times, neighbourhood threshold problem. Interpretations suggested ion electron-hopping situations.A statistical thermodynamic model analysis contact pair formation its effect on ion-conducting systems. In this energy (due solvation polarization) favouring homogeneous complex which cations solvated host, competes an entropic term separated structures (free pairs). We derive phase separation, expression number polymer-bound, homogeneously ions. that will, decrease monotonically increase temperature, due phase-separated material, reminiscent lower consolute temperature phenomenon liquid mixtures.