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MM: Fachverband Metall- und Materialphysik
MM 50: Focus Session: Battery Materials – Ion Transport, Impurity Effects and Modelling (joint session KFM/MM)
MM 50.10: Talk
Thursday, March 21, 2024, 12:55–13:15, EMH 225
Effects of Aluminum trifluoride impurities on NMC811 /Graphite Lithium-ion battery performance. — •Slaheddine Jabri1, Simon Grundmeier2,3, Markus Etzkorn1, Daniel Schröder2, and Uta Shlickum1 — 1Institute of Applied Physics, Technische Universität Braunschweig, 38106 Braunschweig, Germany — 2Institute of Environmental and Sustainable Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany — 3Battery LabFactory Braunschweig, Technische Universität Braunschweig, Langer Kamp 19, 38106 Braunschweig, Germany
The effects of aluminum trifluoride (AlF3) impurities in the electrolyte of full cell lithium-ion batteries has been studied using NMC811/Graphite electrodes. A strong decline of the retention capacity is observed when the cells are cycled at 50 °C in the presence of AlF3 impurities in the electrolyte. The AlF3 accelerates the cell degradation by the generation of various compounds during battery operation. The NMC811 cathode and the Graphite anode are characterized with different techniques. Scanning electron microscopy SEM, including cross-section- Focus Ion Beam FIB, Raman spectroscopy and X-ray photoelectron spectroscopy XPS methods are employed to investigate the effect of the degradation on the electrolyte due to the AlF3 impurities. We found modified chemical components and morphology of the surface electrolyte interface (SEI) and cathode electrolyte interface (CEI) layers of anode and cathode after cell aging with polymer layers on the both surfaces. Pathways to understand the AlF3 impact are proposed.
Keywords: NMC811 cathode; aluminum trifluoride; polymerization; Alkoxide; Raman