Conductivity of the LiBF4 / Mixed Ether Electrolytes for Secondary Lithium Cells

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Abstract
Electrolytic conductivity of has been studied in the mixed system of 1,3‐dioxolane with 1,2‐dimethoxyethane or with tetrahydrofuran. Relative permittivity (dielectric constant) of the solvents suggested the formation of associated ion pairs in the systems, but the conductivity measured was higher than that expected from the viewpoint of ionic association. Conductivity maxima were observed in the solutions containing about 1:1 (by volume) mixed solvents. Viscosities of the solvent and the solution were also measured, and their contribution to the conductivity change with the solvent composition was discussed. Solute concentration dependence of the molar conductivity was specific for the ether solutions. Apparent activation energy for conduction, which was determined by the temperature dependence of the conductivity, varied with concentration. Structural specificity of the mixed ether solutions was discussed with these parameters and 1H NMR spectra of the solutions.

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