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O: Fachverband Oberflächenphysik

O 40: Solid-Liquid Interfaces

O 40.2: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Interaction of ionic liquids with alkali metal films — •Mark Olschewski¹, René Gustus¹, Marcel Marschewski², Oliver Höfft¹, and Frank Endres¹ — ¹Institut für Elektrochemie, Technische Universität Clausthal, Arnold-Sommerfeld-Str. 6, 38678 Clausthal-Zellerfeld, Germany — ²Institut für Energieforschung und Physikalische Technologien, Technische Universität Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld, Germany

As RT-ILs exhibit good ion conductivities, high temperature stability and large electrochemical windows together with a good solubility for lithium salts, they are of potential interest as electrolyte for non flammable Li based batteries, like e.g. lithium/air batteries. To enable good cycle stabilities the interaction of electrolyte and lithium on electrode surfaces has to be investigated carefully. Here thin films of [C1C4Pyrr]Tf₂N (1-butyl-1-methylpyrrolidinium bis[trifluoromethylsulfonyl]amide) and [OMIm]Tf₂N (1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide) were evaporated on lithium and sodium surfaces, interactions subsequently were analyzed by XPS (x-ray photoelectron spectroscopy) and UPS (ultraviolet photoelectron spectroscopy). Both the cation and the anion react with the alkali metals, giving a series of decomposition products. The results exhibit instability of ionic liquids in presence of alkali metal and give a first insight in the differences of the reaction chemistry of pyrrolidinium cations and imidazolium ones.