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This paper describes the preparation and characterization of poly(ethylene oxide) (PEO)-lithium bis(perfluoroethylenesulfonyl)imide (LiBETI), LiN false(SO2CF2CF3)2 polymer electrolytes. The structural properties of Pfalse(EO)n LiBETI electrolyte tapes, investigated using X-ray diffraction (XRD) and differential scanning calorimetry (DSC), are correlated with their ionic conductivities. PEO-LiBETI complexes were found to have very high ionic conductivities due to their amorphous structure. © 2001 The Electrochemical Society. All rights reserved.

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The room temperature stability of the Li interface in the presence of 1,2-dimethyl-3-propylimidazolium imide and methide was followed by electrochemical impedance spectroscopy for a period of 112 days. We found that while Li foil initially reacted with both ionic liquids, the interracial film on Li formed in the imide-based electrolyte stabilized at an interfacial resistance of 1.5 ks cm 2, while that for the methidebased electrolyte rose to an interracial resistance value exceeding 50 kQ, cm 2.