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SUMMARY:Designing Battery Electrode Architectures across Length Scales
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20230331T160000
UID:2026-04-03-23-10-08@natsci.colostate.edu
DTSTAMP:20260403T231008
Description:About the Seminar\n\nThe design and operation of rechargeable b
 atteries is predicated on orchestrating flows of mass\, charge\, and energ
 y across multiple interfaces. Understanding such flows requires knowledge 
 of atomistic and mesoscale diffusion pathways and the coupling of ion tran
 sport with electron conduction. Using multiple polymorphs of V2O5 as model
  systems\, I will discuss our efforts to develop an Ångstrom-level view o
 f diffusion pathways. Topochemical single-crystal-to-single-crystal transf
 ormations provide an atomistic perspective of how diffusion pathways are a
 ltered by modification of V—O connectivity\, pre-intercalation\, and hig
 h degrees of lithiation. Recently devised multi-step synthetic schemes ena
 ble the positioning of Li-ions across four distinct interstitial sites of 
 a V2O5 insertion host and allow for deterministic redirection of Li-ion fl
 ows through strategic positioning of transition-metal ions.\n\nAt higher l
 ength scales\, scanning transmission X-ray microscopy and ptychography ima
 ging provide a means of mapping the accumulative results of atomic scale i
 nhomogeneities at mesoscale dimensions and further enable tracing of stres
 s gradients across individual particles. I will discuss strategies for the
  mitigation of diffusion impediments and degradation mechanisms based on c
 ontrolling the coupling of chemistry\, geometry\, and mechanics. Some of t
 hese strategies include (a) utilization of Riemannian manifolds as a geome
 tric design principle for electrode architectures\; (b) atomistic design o
 f polymorphs with well-defined diffusion pathways that provide frustrated 
 coordination\; and (c) site-selective modification as a means of tuning la
 ttice incommensurability between lithiated and unlithiated phases.\n\nAbou
 t the Speaker \n\nSarbajit Banerjee\, FRSC\, FInstP\, is the Davidson Cha
 ir Professor of Chemistry\, Professor of Materials Science and Engineering
 \, and Chancellor EDGES Fellow at Texas A&amp\;M University. He is a gradu
 ate of St. Stephen’s College (B.Sc.) and the State University of New Yor
 k at Stony Brook (Ph.D.). He was a post-doctoral research scientist at the
  Nanoscale Science and Engineering Center at Columbia University prior to 
 starting his independent career at the State University of New York at Buf
 falo in 2007 where he founded and served as the Co-Director of the New Yor
 k State Center of Excellence in Materials Informatics. At SUNY-Buffalo\, h
 e was promoted to the rank of Associate Professor in 2012. In 2014\, Prof.
  Banerjee moved to Texas A&amp\;M University as a Professor of Chemistry a
 nd Materials Science and Engineering and was named to the Davidson Chair i
 n 2020. Recent distinctions include a NASA Innovative Advanced Concepts Fe
 llowship in 2021\, two separate Special Creativity Extension Awards from t
 he National Science Foundation (2020 and 2021)\, the O’Donnell Award fro
 m The Academy of Medicine\, Engineering\, and Science of Texas (2021)\, an
 d the 2021 Stanley C. Israel Southwest Regional Award for Advancing Divers
 ity in the Chemical Sciences from the American Chemical Society. 4:00 pm
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