About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
In-situ Characterization of Interface Evolution during Zinc Electrodeposition in Alkaline Electrolytes |
| Author(s) |
Ming Tang |
| On-Site Speaker (Planned) |
Ming Tang |
| Abstract Scope |
The unstable cycling of zinc anodes in alkaline electrolytes, caused by dendritic and mossy zinc growth, limits the applications of zinc-air batteries. This study uses operando X-ray nanotomography to visualize zinc the moss growth and dissolution process at nanoscale. Zinc electrodeposition initially forms compact hexagonal plates, followed by growth of filaments with non-(0002) orientations that further evolve into mossy structure. While zinc deposition concentrates at moss periphery, stripping dissolves zinc uniformly within the colony, resulting in electrically isolated 'dead zinc' and capacity fade. We also performed in-situ stress measurement to elucidate the effect of plating stress on zinc moss formation. It was found that stress enhances the moss nucleation rate but has no direct influence on its growth kinetics. A stress-modulated moss formation mechanism is proposed. These findings provide new strategies to stabilize zinc morphology and enhance the longevity of zinc-air batteries. |