Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.7: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
Interaction of Ethylene Carbonate and Propylene Carbonate with Lithium on a Cu(111) Model Electrode — •Maral Bozorgchenani1,2, Florian Buchner1,2, Johannes Schnaidt1,2, Hanieh Farkhondeh1,2, Benedikt Uhl1,2, and R. Jürgen Behm1,2 — 1Ulm University, Institute of Surface Chemistry and Catalysis, 89069 Ulm, Germany — 2Helmholtz Institute Ulm, 89081 Ulm, Germany
Li-ion battery electrolyte is composed of lithium (Li) salts and a mixture of solvents. Ethylene carbonate (EC) is the key solvent in Li-ion battery; however, EC is solid at room temperature (RT) and has to be solved in other solvents such as propylene carbonate (PC). In order to understand the role of these solvents in the formation of solid-electrolyte interphase (SEI), which determines the function of a battery, it is important to understand how the molecules interact with the electrode and with Li. In the present work, the adsorption behavior and reaction of EC and PC on a Cu(111) model electrode was investigated by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and Fourier transformation infrared spectroscopy (FTIR) under ultrahigh vacuum (UHV) condition between 80 - 300 K. EC as well as PC desorb and decompose well below RT. The possible decomposition products as potential species of the SEI will be discussed. Additionally, co-adsorption of Li and EC / PC was investigated at 80 K. Li induced changes compared to EC and PC on bare Cu(111) are discussed.