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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 interfacial film on Li formed in the imide‐based electrolyte stabilized at an interfacial resistance of 1.5 kΩ cm2, while that for the methide‐based electrolyte rose to an interfacial resistance value exceeding 50 kΩ cm2.
Koch et al. (Sat,) studied this question.