Abstract
Ionic liquids are attractive candidates as electrolyte solvents for Li-O2 cells, primarily due to their low volatility, high anodic stability, and low flammability. Specifically, the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr14TFSI) has attracted considerable attention thanks to its electrochemical and chemical stability. In this work, we demonstrate via our recently developed UV-Vis screening method that Pyr14TFSI unfortunately reacts with the superoxide radical (O• −2) which is produced during the discharge of Li-O2 cells. To clarify the reaction mechanism of O• −2 with Pyr14TFSI, we take advantage of the recently described formation of O• −2 upon contact between lithiated lithium titanate (LTO) and O2 to produce a sufficient amount of degradation products from the reaction of Pyr14TFSI with O• −2 that can be detected by NMR. Furthermore, we validate this new screening method for solvent decomposition by superoxide radicals by investigating the behavior of lithiated LTO in contact with O2 using RRDE voltammetry.
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