About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Material Responses Investigated Through Novel In-Situ Experiments and Modeling
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| Presentation Title |
In-Situ TEM Analysis of Microstructural Impact on Filament Growth in All Solid-State Sodium Batteries |
| Author(s) |
Ziming KU Ding, Till Ortmann, Markus Rohnke, Jürgen Janek, Christian Kuebel |
| On-Site Speaker (Planned) |
Christian Kuebel |
| Abstract Scope |
All solid-state sodium batteries (ASSBs) promise high energy density and enhanced safety, but face challenges due to interfacial issues and dendrite growth. We investigate sodium filament growth in polycrystalline Na-β’’-alumina as a model solid electrolyte (SE) to understand the role of microstructure and anisotropic ion transport. Using in-situ biasing transmission electron microscopy (TEM) with a combination of 4D-STEM based ACOM and EDX spectroscopy, we directly imaged the filament growth at grain boundaries (GBs) and at SE/Au interfaces. Simulations based on the experimental microstructure highlight the critical role of anisotropic transport on the overall ion conductivity and, in particular, anisotropic ion transport causes local ion transport blockage at selected GBs, which promotes filament formation. These findings highlight the critical role of grain boundary types and crystallographic orientation in SEs and suggest grain boundary engineering and texturing as an essential step to optimize solid electrolyte performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Energy Conversion and Storage, Nanotechnology |