title: Ion diffusion coefficients model and molar conductivities of ionic salts in aprotic solvents.
abstract: In the study of the electric properties of electrolytes, the determination of the diffusion coefficients of the species that intervene in the charge transport process is of great importance, particularly that of the free ions (D(+) and D(-)), the only species that contribute to the conductivity. In this work we propose a model that allows, with reasonable assumptions, determination of D(+) and D(-), and the degree of dissociation of the salt, α, at different concentrations, using the diffusion coefficients experimentally obtained with NMR. Also, it is shown that the NMR data suffice to estimate the conductivity of the electrolytes. The model was checked by means of experimental results of conductivity and NMR diffusion coefficients obtained with solutions of lithium triflate in ethylene and propylene carbonates, as well as with other results taken from the literature.
authors.affiliation: Departamento de Química-Física, Instituto de Ciencia y Tecnología de Polímeros, Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Juan de la Cierva 3, E-28006 Madrid, Spain.
authors.forename: Leoncio
authors.initials: L
authors.lastname: Garrido
authors.forename: Alberto
authors.initials: A
authors.lastname: Mejía
authors.forename: Nuria
authors.initials: N
authors.lastname: García
authors.forename: Pilar
authors.initials: P
authors.lastname: Tiemblo
authors.forename: Julio
authors.initials: J
authors.lastname: Guzmán