Conductivity and stability towards lithium metal of lithium triflate (LiSO3CF3) and lithium bistrifluorosulfonylimide (Li(SO2CF3)N) in amines and their mixtures with ammonia

The solvates based on combinations of lithium salts with ammonia (called liquid ammoniates) form highly conductive and low cost electrolytes. The generalizing of this fact is possible with amines. Like ammoniates, their solvates possess properties which can widely vary with the composition, the nature of the amine and the anion. Mixtures of NH3, amine(s) and lithium salt(s) were also investigated. These properties include the glass-transition temperature, the conductivity, the vapour pressure and the corrosion rate of lithium. The conductivity can be as high as 1 × 10−2 Ω−1 cm−1 at 60 °C. The lithium stability depends on the anion and on the nature of the amines: with n-propylamine and isopropylamine charged with lithium triflate (only 1.5 M) lithium metal is very stable even at +70 °C during several months.