| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Materials through High Resolution Coherent Imaging
|
| Presentation Title |
Origin of Structural Degradation in Layered Oxide Cathode for Li-Ion Batteries |
| Author(s) |
Tongchao Liu |
| On-Site Speaker (Planned) |
Tongchao Liu |
| Abstract Scope |
Voltage fade prevents effective use of the excess capacity and represents the most crucial technical challenge faced by Li- and Mn-rich cathode materials (LMR) in modern batteries. Herein, relying on the in-situ nanoscale sensitive coherent X-ray diffraction imaging (BCDI) technique, we are able to track the dynamic structure evolution of the LMR cathode. The results reveal that continuous nanostrain accumulation is the original driving force for detrimental structure degradations together with oxygen loss that triggers the well-known rapid voltage decay in LMR. By further leveraging primary to multi-particle structure and electrode-level as well as atomic scale observations, we demonstrate that the heterogeneous nature of the LMR cathode inevitably causes pernicious phase displacement which cannot be eliminated by the previous trials. With these fundamental discoveries, we propose the mesostructural design strategy to mitigate the lattice displacement and inhomogeneous electrochemical/structural evolutions, thereby achieving stable voltage and capacity profiles. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Sustainability, Energy Conversion and Storage |