期刊
CHEMICAL PHYSICS
卷 498, 期 -, 页码 19-24出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2017.09.004
关键词
XPS; LiCoO2; Ethylene carbonate; SEI; Li-ion battery; Ionic interface
资金
- DFG [HA 6128/1-1]
The surface chemistry of cathodic lithium cobalt oxide (LiCoO2) in contact with the Li-ion battery solvent ethylene carbonate (EC) was studied via synchrotron based soft X-ray photoelectron spectroscopy (SXPS). By stepwise in-situ adsorption of EC onto an rf-magnetron sputtered LiCoO2 thin film and consecutive recording of SXPS spectra, the chemical and electronic properties of the interface were determined. EC partially decomposes and forms a predominantly organic adlayer. Prolonged exposure results in the formation of a condensed EC layer, demonstrating that the decomposition layer has passivating properties. Lithium ions deintercalate from the electrode and are dissolved in the adsorbate phase, without forming a large amount of Li-containing reaction products, indicating that electrolyte reduction remains limited. Due to a large offset between the LiCoO2 valence band and the EC HOMO, oxidation of EC molecules is unlikely, and should require energy level shifts due to interaction or double layer effects for real systems. (C) 2017 Elsevier B.V. All rights reserved.
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