Virtual Physics Seminar: "Experimentally probing the ground-truth utilization of anodes in Lithium-Ion Batteries"
Presented by: Dr. Koffi Pierre Yao, University of Delaware, USA
Abstract:
The anode of lithium-ion batteries is the locus of complex electrochemical processes that affect the cell overall performance, durability, and safety including ion transport and intercalation, solid-electrolyte interphase formation, and lithium plating. The convolution of electrochemical processes, i.e., SEI formation from electrolyte degradation versus useful cation intercalation, especially at high charging rates is a barrier to non-destructive understanding of the true utilization and its safety implications. In this talk, Koffi Yao will discuss the use of spatio-temporally resolved operando synchrotron X-ray diffraction and the development of automated data analysis to quantify the state-of-charge of graphite versus time. The technique developed is applied to measure the spatial distribution of lithium-cations within a graphite electrode at high charging rates. Furthermore, the technique is translated to proxy quantification of lithium-cation distribution between silicon and graphite in blended graphite-silicon electrodes.
Biography
Koffi Pierre Yao is an Assistant Professor in Mechanical Engineering at the University of Delaware, USA. He received his BS in Mechanical Engineering at the University of Delaware and his MS and PhD in Mechanical Engineering at the Massachusetts Institute of Technology. He undertook postdoctoral research within the Chemical Science and Engineering Division at the Argonne National Laboratory (USA) prior to joining the University of Delaware in 2018. His research focuses on Batteries, Fuel cells, and Electrolyzers electrochemical systems with a goal of enabling sustainable energy storage. He received several grant awards including from the DOE-Vehicle Technology Office, US National Science Foundation, and Army Research Laboratory.
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Physics Seminars
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