Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Oxides and Interfaces: Adsorption II
O 64.10: Vortrag
Mittwoch, 9. März 2016, 17:15–17:30, H6
The interaction of Li with thin layers of the ionic liquid [BMP][TFSA] adsorbed on rutile TiO2(110) and their thermal stability — •Benedikt Uhl1,2, Maral Hekmatfar1,2, Florian Buchner1,2, and R. Jürgen Behm1,2 — 1Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 2Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89081 Ulm, Germany
Due to their low flammability the use of ionic liquids (IL) as component in Li ion battery electrolytes is one possibility for the development of safer battery systems. To gain a better understanding of the fundamental molecular processes at the electrode|electrolyte interface, the interaction of Li with thin layers of n-butyl-n-methylpyrrolidinium-bis(trifluoromethylsulfonyl)imide [BMP][TFSA] on rutile TiO2(110) was investigated by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) under UHV conditions. Even at 80 K, deposition of Li, either before or after [BMP][TFSA] deposition, leads to a reaction of Li with the TiO2 substrate, forming Ti3+ species in the near surface region. Also the [BMP][TFSA] adlayers are partly decomposed in both cases, in the first case by reaction with the formed Ti3+ species, in the second case by direct reaction with adsorbed Li atoms. The decomposition products of [BMP][TFSA] agree with decomposition mechanisms calculated previously in literature.1 The thermal stability of the resulting layers is monitored up to 630 K until complete decomposition of the adlayers. 1M. C. Kroon, Green Chem. 2006, 8, 3, 241; Thermochim.Acta 2007, 465, 1, 40.