Jean-François Penneau

New handy relationship between the conductivity of concentrated nonaqueous electrolyte solutions and the dielectric constant and viscosity of the solvents

Abstract For nonaqueous electrolyte solutions, we correlated the equivalent conductance Λ 0 at infinite dilution and the conductivity maximum κ MAX with only two intrinsic parameters of the pure solvents: the dielectric constant and the viscosity. On the basis of two new handy empirical formulas, predictions of Λ 0 and κ MAX can now be made for a given salt in any solvent on the basis of only one Λ 0 or κ MAX measurement in only one solvent.

n-Butylamine as solvent for lithium salt electrolytes. Structure and properties of concentrated solutions

Abstract Physical characterizations of some lithium salt solutions in n-butylamine, such as apparent molar volumes, viscosity, vapour pressure measurements, solvation numbers by NMR spectroscopy, electrical conductivities, electroactivity range … have been carried out showing that this amine is a good solvent for lithium batteries. Three salts were used, LiNO3, LiTrif and LiTFSI. Solutions of lithium triflate or LiTFSI are stable toward lithium and possess a good conductivity (better than 3 × 10−3 S cm−1 at + 20 °C) for concentrations far from the saturation (the maximum of conductivity laying within the salt mole fraction interval 0.1–0.2 for LiSO3CF3 · xn-Bu) and an electroactivity range of 4.5 V at a smooth Pt electrode.