About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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Presentation Title |
Advanced (S)TEM Characterization of the Role of Interfaces and Defects during Electrochemical Cycling of Oxide Based Solid Electrolytes and Electrode Materials |
Author(s) |
Kai Wang, Ziming Ding, Yushu Tang, Georgian Melinte, Xiaoke Mu, Di Wang, Ben Breitung, Christian Kuebel |
On-Site Speaker (Planned) |
Christian Kuebel |
Abstract Scope |
Understanding the role of interfaces and defects on the electrochemical processes during battery cycling is critical for a targeted development of new battery materials. With this presentation, I will illustrate how the combination of analytical HR(S)TEM, 4D-STEM and tomography techniques (complemented by bulk X-ray spectroscopy) can be used to understand interface structures/networks and their evolution during electrochemical cycling. As one example for anodic processes, we have studied the conversion/alloying reaction of a high entropy oxide to understand the synergy between cations resulting in a stable conductive nanoscale network as essential contribution to the excellent electrochemical stability of the anode. As an example for the role of grain boundaries and interfaces in solid electrolytes, we have performed in-situ STEM studies to image sodium dendrite formation in sodium beta alumina directly relating microstructure and sodium segregation. The aim of this work is to connect the structural characterization and the electrochemical properties. |