SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 16: Energy Conversion

MM 16.5: Vortrag

Dienstag, 28. März 2023, 11:15–11:30, SCH A 215

Coarse--Grained Simulation of Dendrite Growth in Lithium Metal Batteries — •Len Kimms, Diddo Diddens, and Andreas Heuer — Institut für physikalische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, 48149 Münster

In this talk, we will present a simulation study that investigates the formation and growth of dendrites. Due to the increasing demand for portable high--capacity energy storage, there is a renewed interest in Lithium metal batteries (LMBs). In LMBs one electrode is replaced by lithium metal anchored on a current collector. Lithium metal is electrochemically plated on the anode side when charging the battery. Depositing the metal uniformly is a hugely challenging undertaking. The intrinsically high reactivity of lithium metal, electric field effects, and spatial variations of the local composition in the electrolyte all drive dendritic deposition. We employ a versatile coarse--grained model to understand the influence of various electrochemical conditions on the dendrite morphology. The model allows not only the investigation of fundamental driving forces like the electric field and the cation concentration but also the evaluation of more intricate procedures e.g. pulse charging. Different particle types with varying reactivity are implemented, which allows the representation of local passivation. Also, a solid electrolyte interface (SEI) layer can be incorporated either explicitly with a particle layer on the surface or implicitly by modifying the cationic diffusion locally. Here we report results on how to suppress non--uniform deposition by employing charging, microstructured electrode surfaces, and SEI effects.