Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 33: Transport in Materials: Diffusion, Conduction of Charge or Heat III
MM 33.5: Talk
Wednesday, March 20, 2024, 11:15–11:30, C 264
Simulation of Dendrite Growth at the Electrode Interface in Lithium Metal Batteries — •Len Kimms1, Diddo Diddens1,2, and Andreas Heuer1 — 1Institut für physikalische Chemie, Universität Münster, Corrensstraße 28/30, 48149 Münster — 2Helmholtz Institute Münster (IEK-12), Ionics in Energy Storage, Forschungszentrum Jülich GmbH, Corrensstraße 46, 48149 Münster
In this talk, we will present a simulation study that investigates the formation and growth of dendrites. The limitations of current commercial battery technologies can be possibly solved by using metallic lithium as electrode material. Lithium metal batteries (LMB) employ lithium metal anchored on a current collector as negative electrode. When charging the battery, cations are reduced at the electrode interface. Controlling the deposition to favor uniform plating is inherently challenging. The high reactivity of lithium metal can form a solid electrolyte interphase (SEI) which together with electric--field effects and a locally varying composition of the electrolyte drive dendritic deposition. A generic coarse--grained model is employed to investigate fundamental driving forces on the dendrite morphology. Not only electric--field effects, transport in the electrolyte, and cation concentration can be evaluated but also the optimization of more intricate procedures is possible. The model allows the exploration of dendrite--suppression techniques like pulse charging, application of an artificial SEI layer, or host structures on the electrode. To understand the complex interplay between microscopic electrochemical conditions, the model may be augmented by insights from molecular dynamics simulations.
Keywords: Batteries; Lithium metal batteries; Dendrites; Solid electrolyte interphase