Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Energy Storage Materials and Devices II
CPP 16.5: Talk
Monday, March 9, 2026, 18:30–18:45, ZEU/0260
Understanding the Impedance Spectra of Composite Materials using a 3D Electrical Network Model — •Felix Schug1,2, Sascha Kremer2,3, Christian Heiliger1,2, and Janis K. Eckhardt1,2,3 — 1Institute for Theoretical Physics, Justus-Liebig-University Giessen, Germany — 2Center for Materials Research (ZfM), Justus-Liebig-University Giessen, Germany — 3Institute of Physical Chemistry, Justus-Liebig-University Giessen, Germany
All-solid-state batteries (ASSBs) are promising candidates for next-generation energy storage systems, offering enhanced energy density and safety compared to conventional lithium-ion batteries. Electrochemical Impedance Spectroscopy (EIS) is a powerful method for determining charge transport characteristics in these systems. However, the presence of multiple phases, each with distinct transport processes, as well as complex microstructures result in complex impedance spectra that are challenging to interpret.
To address this challenge, we use a microstructure-resolved 3D electrical network model to simulate charge transport on microscopic length scales. This approach enables us to disentangle the contributions of different transport processes and microstructural features to the impedance response. Our model offers insights into the local potential and current distributions influenced by material heterogeneities, directly connecting them to impedance signals. We provide insights into the impedance of composite materials, identifying the key factors that dominate the impedance signal.
Keywords: Impedance Spectroscopy (EIS); Composite; SSB; Electrical Network Modeling; Solid Electrolyte