Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Inorganic/Organic Interfaces: Towards Application
O 30.4: Vortrag
Dienstag, 17. März 2015, 14:45–15:00, MA 043
Reactive interaction of (sub-) monolayers and multilayers of the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide with co-adsorbed lithium on Cu(111) — •Florian Buchner1,2, Maral Bozorgchenani1,2, Benedikt Uhl1,2, Hanieh Farkhondeh1,2, and R. Jürgen Behm1,2 — 1Helmholtz Institute Ulm, 89081 Ulm, Germany — 2Ulm University, Institute of Surface Chemistry and Catalysis, 89069 Ulm, Germany
The ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethyl-sulfonyl)imide [BMP][TFSA] is a promising candidate for the improvement of rechargeable Li-ion batteries. In this model study the reactive interaction of (sub-) monolayers and multilayers of [BMP][TFSA] with lithium (Li) was investigated on Cu(111) by scanning tunnelling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIRS) under ultrahigh vacuum conditions. Upon co-deposition of Li to [BMP][TFSA] multilayers at 80 K we mainly identified changes in the chemical state of the [TFSA] anion and changes in absorption of anion related mid-IR bands. The co-deposition of Li to [BMP][TFSA] (sub-) monolayers verified the decomposition of [TFSA], independently on the order of deposition. After annealing to 300 K, most of the carbon of the anion and the cation desorbs; at 450 K LiF and Li2S decomposition products dominate. Addition of very small amounts of Li to [BMP][TFSA] resulted in intriguing changes in the STM images which are most likely due to a surface mediated coordination of Li to [TFSA].