About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Atomic-scale Origin of the Low Grain-boundary Resistance in Perovskite Solid Electrolyte Li0.375Sr0.4375Ta0.75Zr0.25O3 |
Author(s) |
Tom Lee, Chaitanya Gadre, Huaixun Huyan, Xiaoqing Pan |
On-Site Speaker (Planned) |
Xiaoqing Pan |
Abstract Scope |
Oxide solid electrolytes (OSEs) offer potential improvements in safety and energy density for lithium-ion batteries. However, high grain-boundary (GB) resistance limits their effectiveness. In the case of the well-studied Li3xLa2/3-xTiO3 (LLTO) perovskite oxide solid electrolyte, GB ionic conductivity is significantly lower than the bulk. Conversely, Li0.375Sr0.4375Ta0.75Zr0.25O3 (LSTZ0.75) perovskite exhibits low GB resistance for unknown reasons. This study uses advanced microscopy and spectroscopy techniques to investigate the atomic-scale structure and composition of LSTZ0.75 grain boundaries. Vibrational electron energy loss spectroscopy uncovers atomically resolved vibrations and unmeasurable Li distribution at these boundaries. Unlike LLTO, LSTZ0.75's GBs lack Li depletion, and their low resistivity results from a nanoscale defective cubic perovskite interfacial structure filled with vacancies. This research offers new insights into the mechanisms behind low grain boundary resistivity, which could benefit OSE applications in lithium-ion batteries. |
Proceedings Inclusion? |
Planned: |