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MM: Fachverband Metall- und Materialphysik
MM 40: Focus Session: Battery Materials – Experimental Characterisation and Safety Testing (joint session KFM/MM)
MM 40.6: Talk
Wednesday, March 20, 2024, 17:05–17:25, EMH 225
Microstructural Impact on Filament Growth in All Solid-state Sodium Batteries — •Ziming Ding1, Yush Tang1, Till Ortmann2, Janis Kevin Eckhardt2, Marcus Rohnke2, Georgian Melinte1, Christian Heiliger2, Jürgen Janek1,2, and Christian Kübel1,3 — 1Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany — 2Institute for Physical Chemistry and Center for Materials Research, Justus Liebig University Giessen, Giessen, Germany — 3Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Although the intergranular growth mechanism in inorganic solid electrolytes (SEs) based lithium-based all solid-state batteries (ASSBs) is well studied, there is still much to be learned for sodium-based ASSBs. The polycrystalline Na-β''-alumina is selected as a model material to investigate its microstructural impact on Na-filament growth. Using in situ biasing transmission electron microscopy, the Na-filament growth at the interface between the SE and electrode and grain boundaries (GBs) within the SE, were observed during Na deposition. The relationship between the microstructure of SE and filaments is further studied through the orientation analysis and corelative imaging. It is found that anisotropic ion transport due to layered crystal structure can contribute to distinctive Na-ion transport behaviors at different GBs during operation and influence the Na-filament growth. This work helps to understand Na-filament formation and how a critical filament network might form leading to failure of the battery.
Keywords: filament growth; all solid-state sodium batteries; in situ TEM; microstructure; anisotropic ion transport