Amorphous solid electrolytes were formed by the interaction of cryptands or crown ethers with a lithium salt, Li[CF3SO2N(CH2)3OCH3], when the cavity size of the macrocycle does not match the diameter of the lithium cation. With the exception of [Li⊂18-C-6][(CF3SO2)2N] (the mathematical symbol of inclusion, ⊂, is used to indicate Li+ included in 18-C-6), the complexes of Li[(CF3SO2)2N] with cryptand and crown ethers do not form amorphous electrolytes. Complexes of Li[CF3SO2N(CH2)3OCH3] and Li[(CF3SO2)2N] were examined by thermal, spectroscopic, and conductivity methods to determine the role of the anion on ionic glass formation.

Solid electrolytes were prepared by the introduction of Li[(CF 3 SO 2 ) 2 N] into amorphous branched polymers and dendritic macromolecular hosts. These materials exhibit high ionic conductivity, but high concentrations of salt increase the glass transition temperatures, with an attendant decrease in ionic conductivity.

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

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