| Résumé | The activities of individual solvent species in multi-solvent ternary liquid electrolytes dictate liquid-solid equilibria and are pertinent to transport phenomena. nonetheless, considerable scholarship has assumed that such electrolytes can be modeled as single-solvent electrolytes. relaxing this assumption, we show in the present work that knowledge of the activity of ionic species, described by the salt thermodynamic factor and the transfer activity coefficients at infinite dilution, is sufficient to calculate activity changes of individual solvent species for ternary multi-solvent electrolytes. we also propose measurements of an individual solvent species activity as a method to study (ionic) solvent transfer energies. we apply the derived relationships to the well-characterized liquid electrolyte system licl in H₂O-EₜOH. we also study a non-aqueous electrolyte solution, LᵢPF₆ in ec-emc, which is important for lithium-ion battery technology. for the latter, we show that in the studied composition space there are non-negligible transfer activity coefficients, highlighting the importance of a multisolvent description of the ternary electrolytes. |
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