LiAsF6 Solutions in the Propylene Carbonate–Dimethylsulfoxide Mixed Solvent: The Conductivity and Electrochemical Stability

Abstract

The conductivity of LiAsF₆ solutions in the propylene carbonate–dimethylsulfoxide mixed solvent with the ionophore molality from 0.2 to 1.4 mol/kg is measured over wide temperature range (Т = 253.15, 263.15, 273.15, 283.15, 293.15, 303.15, 313.15, 323.15, and 333.15 К) at the dimethylsulfoxide content in the mixed solvent changing from 0.2 to 0.75 molar fraction. The conductivity of LiAsF₆ solutions in dimethylsulfoxide is studied over the 293.15–333.15 К temperature range. The concentration dependences of the studied solutions’ conductivity obey the Casteel–Amis equation. With the using of the transition state theory, the solvent and ionophore contributions into the ionic conductance activation energy were determined. The LiAsF₆ solutions in the propylene carbonate–dimethylsulfoxide mixed solvent are shown to have a narrower electrochemical window as compared with the ionophore solutions in the propylene carbonate and dimethylsulfoxide.