Ion-Chain Dynamics in Polymer Electrolytes

Representing polyether-salt systems by chains of interacting coordination shells, defined by the cation and by its nearest ligands, we derive the interaction potential between closest shells – the inter-shells potential – in terms of two-electron polarization effects. Values are presented for monovalent-based crystalline poly(ethylene oxide), PEO, electrolytes. For the eutectic composition ${\text{PEO}}_{12}{\text{EuBr}}_3$, the inter-shells energy is evaluated also by relating the empirical value of the nearest-ligands local-field potential with the variation of the ${\text{Eu}}^{3+}$ concentration. Both methods give the same results.