Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 13: Holistic Structural and Safety Assessment of Lithium-ion and Post-Lithium Cells and their Materials (Experimental Characterisation and Safety Testing)
KFM 13.1: Vortrag
Mittwoch, 19. März 2025, 15:00–15:15, H9
Are Li-ion batteries safe for 2nd-life applications? - The case of aged cells with SEI growth — •Thomas Waldmann1,2,4, Gabriela G. Gerosa1, Jihed Ayari2,3, Abdelaziz A. Abd-El-Latif1, Philipp Moosmann1,5, Max Feinauer1, Olaf Böse1, Markus Hölzle1, and Margret Wohlfahrt-Mehrens1,2 — 1Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), Helmholtzstrasse 8, Ulm, 89081, Germany — 2Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, Ulm, 89081, Germany — 3Karlsruhe Institute of Technology (KIT), Karlsruhe, 76021, Germany — 4Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany — 5Porsche AG, Porschestrasse 911, 71287 Weissach, Germany
Re-using aged Li-ion batteries in 2nd-life applications can increase sustainability. However, there is a lack of knowledge on the safety of aged cells with regard to the underlying aging mechanisms. Room temperature and high temperature aging often lead to growth of the solid electrolyte interphase (SEI) on the surface of graphite or Si/graphite anodes as commonly observed by post-mortem analysis of Li-ion battery cells with physico-chemical analysis methods. We show results on the influence of aging of commercial Li-ion cells in the 1st-life on safety in 2nd-life. Our safety tests (ARC, nail penetration, overcharge, overdischarge) reproducibly show similar or better safety levels for cells with SEI growth in contrast to aged cells with the different mechanism of lithium plating. Possibilities are pointed out to avoid critical mechanisms and for early detection of unsafe behavior.
Keywords: safety; aging mechanisms; batteries; 2nd-life; post-mortem analysis