Regensburg 2025 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Holistic Structural and Safety Assessment of Lithium-ion and Post-Lithium Cells and their Materials (Modelling of Battery Materials and Degradation)

KFM 12.1: Hauptvortrag

Mittwoch, 19. März 2025, 11:00–11:30, H9

Model-assisted Insight into Degradation of Li-Ion Batteries during Thermal Abuse — •Ulrike Krewer, Leon Schmidt, and Jorge Valenzuela — Karlsruhe Institute of Technology, Institute for Applied Materials -Electrochemical Technologies, Karlsruhe, Germany

The electrolyte in Li-ion batteries is inherently thermodynamically instable; this leads to formation of the solid-electrolyte interphase and capacity loss. Exposing batteries to high temperatures above ca. 60°C accelerates interphase growth, but also leads to its dissolution and renewed formation. If the related exothermic heat is not sufficiently fast removed, this leads to self-heating and a thermal runaway of the cell. This talk uses modelling to give a deep insight into the processes and properties causing self-heating and thermal runaway of Li-ion batteries. A complex interaction of exothermic and endothermic reactions is revealed, and the effects of evaporative cooling [1], conditions during battery manufacturing and battery age. [2] Gas analysis with online electrochemical mass spectrometry aids in identifying the network and further sensitivities. [3]

[1] Baakes F. et al., J. Power Sources, 2022, 522, 230881 [2] Baakes, F. et al., Chem. Sci, 2023, 14, 13783 [3] Bläubaum, L. et al., Batter. Supercaps 2024, 7, e20230053.

Keywords: kinetic model; parameter identification; electrolyte degradation; solid-electrolyte interphase; heat evolution