Influence of the anion on the formation of amorphous ionically conducting lithium salt complexes with 18-C-6 and 2.2.2-cryptand macrocycles

Complexes of lithium salts LiCF3SO3, LiI, LiCH3CO2, LiBF4, LiSCN, and Li[R- NSO2-CF3] with the macrocyclic ligands 18-C-6 and 2.2.2-cryptand were exami ned by differential scanning calorimetry, infrared and Raman spectroscopy, and complex impedance. The formation of an amorphous phase appears to be fa cilitated by the presence of an unsymmetrical anion containing an ether oxy gen of the type [R-NSO2CF3](-). An X-ray crystal structure was determined f or Li[CF3SO2N(CH2)(2)OCH3]; these data and that for the previously reported Li[CF3SO2N(CH2)(3)OCH3] structure was correlated with the physical propert ies of their 18-C-6 and 2.2.2-cryptand complexes.