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MM: Fachverband Metall- und Materialphysik

MM 4: Materials for the Storage and Conversion of Energy I

MM 4.6: Talk

Monday, March 9, 2026, 12:00–12:15, SCH/A216

In Situ Scanning Transmission Electron Microscopy Investigation of Solid-State Batteries Under Realistic Processing Conditions — •Thomas Demuth, Shamail Ahmed, and Kerstin Volz — Philipps Universität Marburg, Department of Physics and mar.quest, Marburg, Germany

Solid-state batteries promise safer energy storage with higher energy density compared to conventional lithium-ion batteries with liquid electrolytes. To ensure good ionic conductivity between the cathode active material (CAM) and solid electrolyte (SE), the interface area must be maximized. This can be achieved by co-sintering the materials at elevated temperatures. However, high-temperature treatment can induce secondary phase formation at the SE - CAM interface. To optimize material stability, a fundamental understanding of the materials' structure and the processes occurring at the interface are required. Here, in situ (scanning) transmission electron microscopy ((S)TEM) offers insights into nanoscale reaction processes. In our study, we have heated the CAM LiNiO2 (LNO) as a model system in an oxygen atmosphere, utilizing a closed gas cell heating holder, which enables heating the sample in a gaseous atmosphere of 1 bar to temperatures of up to 1000 °C. Using a scanning nanobeam mode allows rapid switching between live imaging for the observation of morphological changes and recording of 4D diffraction pattern datasets for structural analysis. Our findings indicate that the onset temperature for phase degradation is significantly higher in an oxygen atmosphere compared to vacuum, highlighting the importance of replicating realistic processing conditions.

Keywords: Solid-State Batteries; STEM; in situ; LiNiO2