About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Powder and Ceramic Materials Science
|
Presentation Title |
Enhanced Li-ion Conductivity in Compositionally Complex Perovskite Oxides |
Author(s) |
Shu-Ting Ko, Dawei Zhang, Tom Lee, Ji Qi, Shyue Ping Ong, Xiaoqing Pan, Jian Luo |
On-Site Speaker (Planned) |
Shu-Ting Ko |
Abstract Scope |
Solid oxide electrolytes are promising for next-generation rechargeable batteries due to their nonflammability and rigidity in preventing dendrite penetration, but they often suffer from high grain boundary resistance. Notably, the perovskite-type Li0.375Sr0.4375Ta0.75Zr0.25O3 (LSTZ) exhibits one-order higher grain boundary Li-ion conductivity compared to the well-known Li3xLa2/3 − x□1/3−2xTiO3; however, its bulk ionic conductivity can be further improved. Herein, we report new compositionally complex perovskite oxides (CCPOs) which show higher bulk ionic conductivity than LSTZ, along with improved phase stability. The negligible grain boundary resistance is attributed to the enhanced grain growth as observed by electron backscattered diffraction and vacancies at grain boundaries. Finally, a moment tensor potential (MTP) of a CCPO is developed to simulate both bulk and grain boundary structures, enabling the studies of Li-ion diffusivities and surface energies. The present work demonstrates a new possibility of developing medium- and high-entropy compositionally complex ceramics (CCCs) in energy storage applications. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Ceramics, Characterization |