Regensburg 2025 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Energy Storage and Batteries II
CPP 40.6: Vortrag
Freitag, 21. März 2025, 10:45–11:00, H34
Interpretation of the Impedance Signal 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, 35392 Giessen, Germany — 2Center for Materials Research (ZfM), Justus-Liebig-University Giessen, 35392 Giessen, Germany — 3Institute of Physical Chemistry, Justus-Liebig-University Giessen, 35392 Giessen, Germany
All solid-state batteries (aSSBs) are promising candidates for next-generation energy storage systems, offering high energy and power densities as well as improved device safety compared to the established lithium-ion batteries. Electrochemical impedance spectroscopy (EIS) is one of the key methods to determine charge transport characteristics of the material components in an aSSB. Many of these components are composed of multiple phases, with various transport processes affecting the impedance response signal. Furthermore, the microstructure of the material manifests as a signal within the impedance spectrum. The interpretation of an impedance spectrum is therefore not straightforward, as many signals overlap or are indistinguishable from each other. We therefore employ a microstructure-resolved 3D electrical network to modulate charge transport on microscopic length scales. This approach reveals how microstructure affects the impedance response, as well as the potential and current distributions within a system. It is used to investigate the impedance of composite materials and to develop guidelines for its interpretation.
Keywords: Impedance Spectroscopy; EIS; SSB; Electrical Network; Modeling