Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.18: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B1
Combined STM and XPS investigation on the Ethylene Carbonate | Cu(111) interface — •Hanieh Farkhondeh1,2, Florian Buchner1,2, Benedikt Uhl1,2, and Rolf-Jürgen Behm1,2 — 1Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89069 Ulm, Germany — 2Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany
Ethylene Carbonate (EC) is an important component in Li-ion battery electrolyte. A molecular understanding of the solid electrolyte interphase (SEI) is crucial to improve the Li-ion battery performance. In this work, the behavior of the EC | Cu(111) interface, as a model system, was investigated at sub-monolayer and monolayer coverages. The adlayers were characterized with STM and XPS under UHV conditions at temperatures between ~100 K and room temperature. With XPS, the intact EC was observed in the multilayer, monolayer and sub-monolayer range around 100 K, where two peaks in the C1s and O1s core level region reflect its stoichiometry. STM data at 100 K show that the molecules aggregate in 2D ordered islands at mono- and submonolayer coverages. The contour of these domains strongly changes in time sequence of STM images, which means they are not stable, pointing to weak adsorbate-adsorbate interactions. At room temperature, only noisy features are observed, i.e., EC molecules move too rapidly to be imaged with STM. The co-deposition of Lithium will be conducted in forthcoming experiments.