#  Sarbajit Banerjee (Texas A&M) 

 



####  calendar\_today Date and Time 

 **November 8, 2023** 

 04:15PM - 05:15PM EST 

####  pin\_drop Location 

 **Pfizer Lecture Hall**  



 

 



 

 Title: Designing and Architecting Battery Electrode Materials across Length Scales

 The design and operation of rechargeable batteries is predicated on orchestrating flows of mass, charge, and energy across

 multiple interfaces. Understanding such flows requires knowledge of atomistic and mesoscale diffusion pathways and

 the coupling of ion transport with electron conduction. Using multiple polymorphs of V2O5 as model systems, I will discuss

 our efforts to develop an Ångstrom-level view of diffusion pathways. Topochemical single-crystal-to-single-crystal

 transformations provide an atomistic perspective of how diffusion pathways are altered by modification of V—O connectivity, preintercalation,

 and high degrees of lithiation. Recently devised multi-step synthetic schemes enable the positioning of Li-ions

 across four distinct interstitial sites of a V2O5 insertion host and allow for deterministic redirection of Li-ion flows through

 strategic positioning of transition-metal ions.

 At higher length scales, scanning transmission X-ray microscopy and ptychography imaging provide a means of mapping the

 accumulative results of atomic scale inhomogeneities at mesoscale dimensions and further enable tracing of stress

 gradients across individual particles. I will discuss strategies for the mitigation of diffusion impediments and degradation

 mechanisms based on controlling the coupling of chemistry, geometry, and mechanics. Some of these strategies include (a)

 utilization of Riemannian manifolds as a geometric design principle for electrode architectures; (b) atomistic design of

 polymorphs with well-defined diffusion pathways that provide frustrated coordination; and (c) site-selective modification as a

 means of tuning lattice incommensurability between lithiated and unlithiated phases.



 



 

 



 

 See also:- [ Harvard/MIT Inorganic Chemistry Seminar ](/seminars/inorganic-chemistry-seminar)
 
 

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