Characterization of Mixed Solvents of Tetrahydofuran and Acetonitrile for Magnesium Ion Battery

Abstract

Mixed organic electrolytes formed by the combination of Tetrahydrofuran (THF)/ and  Acetonitrile (AN) solvents with Magnesium Perchlorate salt were prepared and characterized for their physico-chemical properties. These properties include density, viscosity, conductivity, dielectric constant, Critical distance for ion pair formation, . The cells of Mg²⁺ ion containing electrolytic solutions of the binary mixtures of organic solvents were also studied. Jones –Dole viscosity/concentration dependence plots were made, and the ion-ion interaction coefficient (A) and the ion-solvent interaction coefficient (B) were determined. Molar conductivity measurements investigated at 25⁰c demonstrated that the mixed systems exhibit a wide electrochemical stability window than the pure solvents. The properties of the mixed electrolytes were affected by ion-solvent and solvent-solvent interactions. The results have been interpreted on the basis of the intermolecular interactions among the component molecules of the systems. The temperatures studied show that the battery remain stable even at high temperatures. The mixing ratio of the organic solvents for optimal battery performance is established to be between 15-25%THF for the  system studied.

Key words: Battery,Magnesium ions, conductivity,viscosity,density, voltage