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O: Fachverband Oberflächenphysik

O 97: Nanostructured Surfaces and Thin Films

O 97.6: Vortrag

Freitag, 11. März 2016, 11:45–12:00, S053

Study of Solid Electrolyte Interphase layer in Sodium-Ion Batteries — •Liang-Yin Kuo¹, Payam Kaghazchi¹, and Bing-Joe Hwang² — ¹Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany — ²Department of Chemical Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Rd., Taipei 106, Taiwan

Sodium (Na)-ion batteries are considered as alternative to Li-ion batteries. Sodium is abundance in the earth*s crust and the distribution of sodium mineral salts is widespread. In this work, we present a combined in situ surfaced-enhanced Raman spectroscopy (in situ SERS) and density functional theory (DFT) study on the solid electrolyte interphase (SEI) layer over the surface of Sn anodes in Na-ion batteries. Our in situ SERS measurements show that the main components of the SEI layer during Na-ion insertion/extraction are Na2O (peaks around 479 cm-1 and 597 cm-1) and Na2CO3 (peak around 1080 cm-1). Afterwards, we will discuss our DFT results on electronic and atomic structure as well as the mechanism of Na diffusion through Na2O and Na2CO3.