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[DOES Seminar] Dr. Mahalingam Balasubramanian (Argonne National Laboratory) Dec. 2nd
Date 19-11-25 09:26
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Dec. 2nd Mon. 2019, 10:30am
N Center #86126, Sungkyunkwan University, Suwon


 


Operando core-shell spectroscopy of battery materials


Dr. Mahalingam Balasubramanian


(Spectroscopy Group, X-ray Science Division, Argonne National Laboratory)


 


Abstract


Battery based energy storage is expected to play a vital, enabling role in future energy supply and demand. In particular, it is likely that storage of electricity generated from major renewable energy sources (such as solar, wind, or wave power) will be an important component of future energy portfolios worldwide. In the realm of transportation, rechargeable batteries are already being used for hybrid and all-electric applications. However, for mass adaptation of battery technology, either for grid-storage or transportation applications, transformative changes in battery technology are required. Critical to the advancement of batteries (Li-ion or other beyond Li-ion solutions) is a fundamental and in depth understanding of the electronic and structural changes of the electrode materials during battery operation.


Research at the APS using hard x-ray spectroscopy (energy in the range 2.5-55 KeV) focuses on x-ray absorption fine structure spectroscopy (XAFS), x-ray emission spectroscopy, x-ray Raman scattering, and micro beam(mapping, micro-XAFS, and micro-diffraction) applications of hard x-rays. Spectroscopy beamlines are designed primarily for energy variable applications. Using in situ core-shell spectroscopic methods we seek to capture the intricate details of the redox behavior (electronic structure) as well as the element specific local structure of these materials. Such studies provide unique insight to develop structure-property correlations that are important to predict long-term battery performance as well as help tailor new novel materials with high capacities, high power, and stable crystal structures.


In this talk, I will discuss the fundamental understanding we have gained on lithium-excess materials over almost two decades of research and highlight the development and application of advanced spectroscopy tools to battery science.


The submitted abstract has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory(“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No.DE-AC02-06CH11357. The U.S. Government retains for itself, and others acting on its behalf, a paid-up nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government.


Brief Bio


Dr. Balasubramanian’s research uses X-rays to investigate advanced materials of technological importance. In the past twenty-five years, he has used synchrotron techniques to elucidate the structure-property relationship of several important condensed matter systems such as intermetallic alloys, superconducting materials, nanostructured materials, electrochemical thin films, and catalytic materials. His more recent research addresses fundamental questions in energy sciences with emphasis on  lithium- and beyond lithium-ion energy storage systems, hydrogen storage materials, solvation structure of ions in aqueous and non-aqueous solvents, electrocatalysts, and the like. He directs a project on the development of new synchrotron techniques for the in-situ characterization of electrochemical systems. He is also involved in the maintenance, general operation, and user support at the sector-20 beamlines in the Advance Photon Source. He is an author or co-author of over 180 publications.