Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster I
CPP 17.38: Poster
Monday, March 9, 2026, 19:00–21:00, P5
Investigating the Interfacial Impedance Characteristics of Composite Materials — •Janne Mattis König1,2, Felix Schug1,2, Christian Heiliger1,2, and Janis K. Eckhardt1,2,3 — 1Institute of Theoretical Physics, Justus-Liebig-University Giessen, 35392 Giessen, Germany — 2Center of Material 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 a promising alternative to conventional lithium-ion batteries, offering high energy and power densities, long-term stability, and fast-charging capability. Consequently, significant effort is focused on identifying suitable materials. Electrochemical impedance spectroscopy (EIS) is a key characterization technique, but interpreting spectra from realistic composite systems remains challenging. In this work, we investigate interfacial impedance in simplified composite microstructures using a 3D electrical network model. The simulations reveal that high charge-transfer resistances lead to geometric constriction effects, producing an impedance signature that closely resembles a migration process or a charge-transfer reaction. This constriction impedance is strongly influenced by the composite microstructure. Furthermore, increased conductivity along the interface introduces a characteristic deformation in the impedance spectrum shape. Overall, these findings clarify the origin of interfacial impedance features in composite materials and support more informed interpretation of EIS measurements in ASSB research.
Keywords: Impedance Spectroscopy; EIS; SSB; Electrical Network; Modeling