Triglyme−Li⁺ Cation Solvate Structures:  Models for Amorphous Concentrated Liquid and Polymer Electrolytes (I)

Crystalline phases of (triglyme) 1:LiX (X = CF 3 SO 3 -, BF 4 -, ClO 4 -, and AsF 6 - ) have been isolated and structurally characterized. The phases are isostructural and represent a novel form of Li + cation coordination not observed in crystalline poly(ethylene oxide) (PEO)−salt phases. The crystal structure of a (triglyme) 1:LiBPh 4 phase has also been determined, which differs markedly from those found with the smaller anions. In addition, a more concentrated (triglyme) 2/3:LiCF 3 SO 3 phase has been characterized, which also displays a novel form of Li + cation coordination. Such solvates represent models for interchain cation transport transition states in concentrated liquid and amorphous PEO electrolytes.