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UMERC Special Seminar: Jagjit Nanda
Friday, November 3, 2017
3:00 p.m.-4:00 p.m.
Rm. 2110, Chemical and Nuclear Engineering Bldg.
For More Information:
Catherine Stephens
301 405 9378
csteph5@umd.edu

Meso and Micron Scale Chemical and Morphological Heterogeneities in High Capacity Battery Materials and Interfaces

Jagjit Nanda

Materials Science and Technology Division

Oak Ridge National Laboratory, Oak Ridge TN 37831

Electrochemical storage systems such as lithium based batteries, redox flow systems and ultra-capacitors are highly complex assemblies whose performance, life and safety are fundamentally governed by hierarchical multi-scale interaction between materials, electrochemical transport (diffusion and kinetics), architectures and system design. Most often the electrode materials undergo irreversible structural and microstructural changes under continuous electrochemical cycles that can have measurable impact on the battery capacity and life. The talk will provide mechanistic understanding of such material and phase transformations using multi-scale x-ray, laser and neutron spectroscopic methods. Specifically, combining transmission x-ray imaging combined with near edge absorption spectroscopy (TXM-XANES) to study the evolution of chemical oxidation state of the transition metal (TM) cations accompanied by changes in the particle morphology at mesoscale for high voltage lithium-rich disorder NMC (LMR-NMC) and Li2Cu0.5Ni0.5Ocathodes and solid-oxide electrolytes.2-4 In combination, various multi-scale in-situ and ex-situ Raman and neutron imaging provides vibrational and phase contrast analysis occurring at the bulk electrode as well as at the electrode-electrolyte interfaces.5-7 Final part of the talk will provide a glimpse of new research topics undertaken in the group related to (i) Na-ion based mediated organic redox flow batteries and composite membranes that would radically increase the energy density without increasing the system size and cost and (ii) MXene based 2D materials as novel platform for energy storage & conversion.8


References

1. M. S. Whittingham, Chem. Rev. 104, 4271 (2004); G. Goodenough and Y Kim, Chem. Mater.  22 (3), pp 587–603 (2010)
2. H. Dixit, J. Nanda et al, ACS Nano, 8 (12) 12710 (2014)
3. R. Ruther, J. Nanda et al. Chem. Mater. 29, 2997 (2017)
4. F. Yang, Y. Liu, J. Nanda et al. Nano Letts. 14, 4334, (2014)
5. J. Nanda, H. Bilheux, et al, J. Phys. Chem. C, 116, 8401 (2012)
6. R. Ruther, J. Nanda et al J. Phys. Chem. C 119, 18022 (2015)
7. H. Zhou, H. Bilheux, J, Nanda et al ACS Energy Letters, 1, 981−986 (2016)
8. E. Muckley, M. Naguib, J. Nanda et al. ACS Nano, DOI 10,1021/acsnano.7b05264

Biosketch: Jagjit Nanda is a Team Leader and Senior Staff Scientist at Materials Science and Technology Divison, Oak Ridge National Laboratory working in the area of energy storage materials, systems and multiscale imaging & spectroscopy. He also holds a joint appointment as a professor in Department of Chemical and Bio-molecular Engineering, University of Tennessee. Prior to joining Oak Ridge, Jagjit worked as a Technical Expert at the Research and Advance Engineering Center of Ford Motor Company, Dearborn, Michigan (2005-09), leading R&D projects in the area of energy storage materials and nanotechnology. Jagjit received his Ph.D. in Solid State Chemistry & Materials Science from Indian Institute of Science, Bangalore in 2000 working in the area of colloidal semiconductor nanostructures for photovoltaic and light emitting application. Following his PhD, Jagjit spent two years working as a post-doctoral fellow at Stanford University (2000-02) and then 3 years at Los Alamos National Laboratory as a Research Staff Associate (2002-05) applying various ultra-fast laser spectroscopic methods for probing condensed phase systems such as photo-induced electron transfer couples, quantum dot heterostructures and charge transfer complexes. He has more than 150 technical publications, several patents and is an active member in a number of professional scientific societies. Also at Bredesen Center For Interdisciplinary Research and Graduate Education and Department of Chemical & Bio-molecular Engineering, University of Tennessee, Knoxville.

This Event is For: Graduate • Faculty

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