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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster I
CPP 17.40: Poster
Montag, 9. März 2026, 19:00–21:00, P5
Microstructure-Resolved Impedance Modeling of Cathode Composite Electrodes for Solid-State Batteries — •Matthias Braun1,2, Felix Schug1,2, 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
Solid-state batteries (SSBs) rely on composite cathodes whose complex microstructures critically influence ionic and electronic transport. Electrochemical impedance spectroscopy (EIS) is widely used to probe these transport processes. The impedance behavior of mixed ionic electronic conductors is commonly interpreted using transmission-line models (TLMs). However, the extent to which composite microstructure governs impedance features and the validity of TLM-based interpretations remains insufficiently understood. In this work, we employ microstructure-resolved impedance simulations to investigate how key structural characteristics of cathode composites shape their impedance response. We demonstrate that interface morphology and porosity significantly modulate the spectra, giving rise to microstructure-specific features that conventional TLMs fail to capture. In particular, geometric current-constriction effects at the cathode active material/solid-electrolyte interface emerge as dominant contributors to impedance behavior. These findings provide a deeper mechanistic understanding of microstructure-induced impedance signatures and offer practical guidance for interpreting EIS data in composite electrodes for SSBs.
Keywords: Impedance Spectroscopy (EIS); Cathode; SSB; TLM; Modeling