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<div dir="ltr"><span style="font-size:10.5pt; font-family:"Arial","sans-serif"; color:#1F497D"> ***** Seminar *****</span><span style="color:#1F497D"></span>
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<b><span style="font-size:16.0pt; color:#1F497D">Department of Electrical and Computer Engineering</span></b><span style="font-size:16.0pt; color:#1F497D"></span></p>
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<b><span style="font-size:16.0pt; color:#1F497D">Materials Engineering Program</span></b></p>
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<b><span style="font-size:14.0pt; color:#1F497D">Center for Integrated Bio and Nano Systems</span></b></p>
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<b><span style="font-size:14.0pt; color:#1F497D"> 10:00 a.m., Feb. 5</span></b><b><span style="font-size:14.0pt; color:#1F497D">, 2021</span></b></p>
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<b><span style="font-size:14.0pt; color:#1F497D">Meeting ID: 845 619 943</span></b></p>
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<b><span style="font-size:14.0pt; color:#1F497D">Password: 016104 </span></b></p>
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<b><span style="font-size:20.0pt; color:#1F497D"></span></b><b><span style="font-size:20.0pt; color:#1F497D"></span></b><b><span style="font-size:20.0pt; color:#1F497D">Interfacial Engineering of Solid-State Batteries
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<div> <span style="font-family:"Times New Roman",Times,serif">
Neil P. Dasgupta</span></div>
</span></b><b><span style="font-size:18.0pt; color:#1F497D"> </span></b><b><span style="font-size:18.0pt; color:#1F497D"> </span></b> <span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(23,78,134)">Department
of Mechanical Engineering,</span></div>
<div class="x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_WordSection1"><span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(23,78,134)"> University of Michigan
</span><span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(0,36,81)"><br>
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<div class="x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_WordSection1"><span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(23,78,134)"> </span><span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(0,36,81)">
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<div class="x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_WordSection1"><b><span style="color:#1F497D">Abstract</span></b><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">:</span><span style="color:#1F497D"> <span style="font-size:12pt; font-family:"Times New Roman",serif">
Solid-state batteries have seen a dramatic increase in research in recent years because of their ability to address safety challenges associated with flammable liquid electrolytes, and the potential to enable Li metal anodes. However, all solid-state interfaces
present unique challenges, including high interfacial impedances, accommodation of mechanical stresses due to solid-solid interfacial contact, and (electro)chemical instabilities that can evolve during dynamic cycling conditions.
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<div>To address these challenges, our group focuses on gaining new fundamental insights into the coupled phenomena occurring at interfaces, and applied this knowledge to rationally design interfacial composition and structure to address the root cause of performance
limitations. In this talk, I will first present a multi-modal in situ/operando characterization approach to study Li metal-solid electrolyte interfaces during cycling. As model systems, I will discuss examples of Li metal cycling against the garnet oxide electrolyte
Li7La3Zr2O12 (LLZO) and sulfide electrolyte Li10GeP2S12 (LGPS). Mechanistic insight will be provided into solid-electrolyte interphase (SEI) evolution, as well as nucleation and growth dynamics of the Li metal anode during cycling.</div>
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<div>In addition to these coupled morphological/chemical/electrochemical phenomena, the unique mechanical properties of Li metal will be discussed in the context of solid-state battery interfaces. Using a unique glovebox-integrated mechanical testing system,
we demonstrate that the mechanical deformation of Li metal is dominated by creep over a wide range of battery conditions. Furthermore, the wettability of molten Li metal to solid electrolyte surfaces will be quantitatively described using glovebox-integrated
sessile drop tests to demonstrate the coupled relationships between interfacial chemistry and impedance.
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<div>Equipped with this fundamental knowledge, I will describe the rational design of interlayers at the Li metal-SE interface using Atomic Layer Deposition (ALD). Examples will be presented in both bulk solid-state battery interfaces, and thin film electrolytes
deposited by ALD. By studying interfacial chemistry across length scales ranging from atoms to millimeters, we have been able to systematically identify the mechanisms of interfacial degradation, and answer the question of why a particular interface exhibits
the observed electrochemical behavior. Through this interdisciplinary approach of fundamental materials chemistry and applied engineering, strategies to address future interfacial challenges will be addressed, pointing towards rational design and manufacturing
of optimized interfaces. </div>
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<span style="font-size:11.0pt"><b><span style="color:rgb(23,78,134); font-size:12pt; font-family:"Times New Roman",Times,serif">Short Bio</span></b><span style="color:rgb(23,78,134); font-size:12pt; font-family:"Times New Roman",Times,serif">:
</span></span>
<div class="x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_WordSection1"><span style="font-size:11.0pt"><span style="font-size:12pt; font-family:"Times New Roman",Times,serif; color:rgb(23,78,134); background:white none repeat scroll 0% 0%">
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<span style="font-family:"Times New Roman",serif">Neil Dasgupta is an Associate Professor in the Departments of Mechanical Engineering and Materials Science & Engineering at the University of Michigan. He earned his Ph.D. from Stanford University in 2011. Prior
to joining University of Michigan in 2014, he was a postdoctoral fellow at the University of California, Berkeley. He is a recipient of the NSF CAREER award, DARPA Young Faculty Award (YFA), AFOSR Young Investigator Award (YIP), 3M Non-Tenured Faculty Award,
and the ECS Toyota Young Investigator Fellowship. His research focuses on the intersection of materials chemistry, energy conversion, and manufacturing. </span></p>
</span></span><span style="font-size:11.0pt"><span style="color:rgb(23,78,134); font-size:12pt; font-family:"Times New Roman",Times,serif"></span></span><span style="font-size:11.0pt"><span style="color:rgb(23,78,134); font-size:12pt; font-family:"Times New Roman",Times,serif"></span></span><span style="font-size:11.0pt"><span style="color:rgb(23,78,134); font-size:12pt; font-family:"Times New Roman",Times,serif"></span></span><span style="font-size:11.0pt"></span><span style="font-size:11.0pt"></span><span style="font-size:11.0pt"></span><span style="font-size:11.0pt"></span><span style="font-size:11.0pt"></span><span style="font-size:11.0pt"></span><span style="font-size:11.0pt"></span></div>
<div class="x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_WordSection1"><span style="font-size:11.0pt"><span style="font-size:12pt; font-family:"Times New Roman",Times,serif; color:rgb(23,78,134); background:white none repeat scroll 0% 0%"> <br>
</span></span></div>
<div class="x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_WordSection1"><span style="color:rgb(23,78,134); font-size:11pt; font-family:"Times New Roman",Times,serif">Please contact Dr.
</span><span style="color:rgb(23,78,134); font-size:11pt; font-family:"Times New Roman",Times,serif"></span><span style="color:rgb(23,78,134); font-size:11pt; font-family:"Times New Roman",Times,serif"><span style="font-size:11.0pt; color:#1F4E79"><a href="mailto:yyao4@uh.edu" target="_blank" rel="noopener noreferrer"><span></span></a></span><span style="color:rgb(23,78,134); font-size:11pt; font-family:"Times New Roman",Times,serif">Yan
Yao</span> <yyao4@Central.UH.EDU> or Jiming Bao (jbao@uh.edu) if you want to meet with the speaker.</span></div>
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<p class="x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px;margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin-top:0px; margin-bottom:0px; margin:0in 0in 0.0001pt; font-size:12pt; font-family:"Times New Roman","serif"">
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