Dresden 2026 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Energy Storage Materials and Devices I
CPP 4.4: Vortrag
Montag, 9. März 2026, 10:30–10:45, ZEU/0255
Investigating the Conversion Reaction of the Cathode Active Material FeS2 in Solid-State Batteries via Transmission Electron Microscopy — •Franziska Hüppe1, Matilde Pavan2, Shamail Ahmed1, Jürgen Belz1, Jürgen Janek2, and Kerstin Volz1 — 1Philipps-Universität Marburg, Department of Physics and mar.quest, Hans-Meerwein-Straße, 35043, Marburg, Germany — 2Justus-Liebig-Universität Gießen, Institute of Physical Chemistry and Center for Materials Research, Heinrich-Buff-Ring, 35392, Gießen, Germany
Solid-state batteries are particularly promising for high-energy storage, as they potentially allow for the use of electrode materials with higher specific capacities. In the case of FeS2 as cathode active material, also the cost effectiveness and the environmental impact would be drastically enhanced. However, FeS2 is a conversion-type material that undergoes continuous compositional and structural changes during cycling that is not yet fully understood at the micro- and nanoscale.
Scanning transmission electron microscopy (STEM) offers structural insights at high resolution and is combinable with deepening investigation methods like energy dispersive X-ray spectroscopy (EDX) and electron energy loss spectroscopy (EELS) to identify the different compounds forming during different depth of discharge (lithiation).
The pristine, uncycled cathode sheet contains FeS2 particles with cubic structure. With increasing depth of discharge, the particles react from the outside in, forming core-shell structures. The multimodal STEM analysis will be discussed in detail during the presentation.
Keywords: Solid-State-Battery; Conversion Reaction; First Discharge; Transmission Electron Microscopy (TEM); Electron Energy Loss Spectroscopy (EELS)