Regensburg 2025 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 14: Materials for the Storage and Conversion of Energy (joint session MM/KFM)
MM 14.4: Vortrag
Dienstag, 18. März 2025, 14:45–15:00, H22
Modeling and optical characterization of Lithium deposition on Copper current collectors — •Len Kimms1, Tjark Ingber2, Diddo Diddens1,2, and Andreas Heuer1 — 1Institut für physikalische Chemie, Universität Münster — 2Helmholtz Institute Münster (IEK-12), Forschungszentrum Jülich GmbH
In this contribution, we will present modeling results of the initial deposition of lithium metal on a copper current collector combined with experimental insights. Zero--excess lithium--metal batteries (ZELMBs) may offer higher energy densities, better safety, and reduced cost by reducing the amount of lithium employed in the cell. Instead of an excess of lithium as electrode, the anode is formed in situ during charging. When charging the battery, lithium is plated on the current collector directly. However, the lifespan of ZELBMs in practical applications is still limited by irreversible loss of active lithium. The loss is induced by the high reactivity of lithium which causes parasitic side reactions and dendrite growth during charging cycles. To uncover the mechanisms at play, the initial deposition of lithium metal has been experimentally investigated by plating varying amounts on a copper surface with different current densities. The deposits have been characterized by scanning electron microscopy (SEM) and laser scanning microscopy (LSM) in an automated way. Numerical simulations of a simple geometric model were employed to uncover the relevant mechanisms which govern the growth over different stages. Combining the experimental and numerical results, an effective description of the deposition has been found.
Keywords: Lithium metal batteries; Zero excess; Anode free; Avrami model; Kolmogorov--Johnson--Mehl--Avrami model