phase behaviors of solid polymer electrolyte/saltsystem in lithium secondary battery by group contribution method: applicability of modified double lattice model with pressure effect

Abstract

A new group-contribution model based on the modified double-lattice theory with the free volume effect is developed and applied to describe phase-behaviors of solid polymer electrolyte/salt system with various pressures. The proposed group-contribution model includes the van der Waals energy contribution from dispersion and polar forces. Our result show that an eutectic point moves toward higher Tm and lower weight fraction of salt with increasing pressure. Quantitative description according to the proposed model is in good agreement with the experimentally observed transition temperature of a given system.