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Some physicochemical properties of the mixed solvents of propylene carbonate and 1,2‐dimethoxyethane dissolving various salts have been measured at 30°C, in order to clarify the mixing effect of the organic electrolytes for high energy density batteries. The vapor pressure and laser Raman spectra of the mixed solvents provided significant information regarding the solvent‐solvent interactions. Ionic conductivities under infinite dilution condition were determined by the measured molar conductivities of the salts and transport numbers of the ions; the Stokes' radii of the ions in the mixed solvents were also estimated. A specific solvation of cations with 1,2‐dimethoxyethane in the mixed solvents seems to give captured cations like a crown ether does. These solvent‐solvent and ion‐solvent interactions mainly contribute to the excellent conductance of the electrolyte using the mixed solvents.

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