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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Arial",sans-serif"><a href="https://www.chee.uh.edu" target="_blank"><span style="color:#C8102E;text-decoration:none"><img border="0" width="600" height="165" style="width:6.25in;height:1.7187in" id="_x0000_i1025" src="https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2022/images/sa_header.png" alt="William A. Brookshire Department of Chemical and Biomolecular Engineering Seminar Series"></span></a><o:p></o:p></span></p>
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<b><span style="font-size:16.0pt">Cation Insertion in Vanadium Oxides: Insertion Mechanisms, Intercalation-Induced Phase Transformations, and Electrochemistry-Mechanics—Particle-Geometry Coupling</span></b><b><span style="font-size:16.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></b></p>
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<strong><span style="font-size:16.0pt;font-family:"Calibri",sans-serif">Yuting Luo</span></strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><br>
Postdoctoral Associate<br>
University of Illinois Urbana-Champaign<o:p></o:p></span></p>
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<strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Monday, January 30 | 10:00am</span></strong><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><br>
</span></b><span style="font-size:14.0pt">CEMO 105</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#C8102E">LECTURE ABSTRACT</span></strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#C8102E"><o:p></o:p></span></p>
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<span style="font-size:12.0pt">Lithium-ion batteries (LiBs) have a crucial role to play in the energy transition, from enabling electromobility to managing renewable energy curtailment and addressing the myriad challenges of an entirely reimagined electric
grid. However, state-of-the-art devices have reached only about 25% of their possible theoretical capacity. In cathode materials of Li-ion batteries, Li-ions are stored and extracted as needed from packed ensembles of individual particles. Challenges in the
design and construction of electrode architectures that allow for their entire interior volumes to be reversibly accessible for ion storage have limited accessible capacity and fast charging. In addition, charging/discharging of the battery generates large
stresses, which underpins mechanical failure.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.25in"><span style="font-size:12.0pt">Even though á-V<sub>2</sub>O<sub>5</sub> is considered a promising cathode material as a result of high theoretical capacity, cation intercalation in V<sub>2</sub>O<sub>5</sub> often
brings about energy dissipative phase transformations that lead to substantial intercalation gradients as well as multiscale phase and strain inhomogeneities, and finally leading to capacity fading and battery failure. The considerable ion transport resistance
is arises from phase boundaries stabilized within actively intercalating particles.</span><span style="font-size:12.0pt"> Given the effect of phase inhomogeneities on the electrochemical and mechanical performance, multiscale materials design strategies are
needed to mitigate the deleterious effects of phase separation and to develop long-lasting and fast-charging Li-ion batteries.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.25in"><span style="font-size:12.0pt">We have developed several conceptual strategies involving (i) modification of crystallite geometries; (ii) utilization of metastable polymorphs with reconfigured atomic connectivities;
and (iii) cation pre-intercalation to mitigate the formation of phase inhomogeneities. As such, we have obtained improved reversible capacity, enhanced cycling stability, excellent rate capability, and reduced stress accumulation. These strategies have broad
generalizability to the design of cathodes for Li-ion and “beyond Li-ion” batteries.
<o:p></o:p></span></p>
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<strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#C8102E">SPEAKER BIOSKETCH</span></strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#C8102E"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify">Dr. Yuting Luo is currently a postdoctoral associate in the department of materials science and engineering at University of Illinois Urbana-Champaign. Her research expertise includes designing and characterizing
nanomaterial as well as fundamentally understanding the mechanism of phase transitions and transport properties for Li-ion batteries and all-solid-state batteries. She earned her Ph.D. degree in Chemistry in 2022 from Texas A&M University under the supervision
of Prof. Sarbajit Banerjee. <o:p></o:p></p>
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<em><span style="font-size:8.5pt;font-family:"Arial",sans-serif">This is an official message sent by the William A. Brookshire Department of Chemical & Biomolecular Engineering.</span></em><span style="font-size:8.5pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Arial",sans-serif"><a href="https://www.chee.uh.edu" target="_blank"><span style="color:#C8102E;text-decoration:none"><img border="0" width="600" height="165" style="width:6.25in;height:1.7187in" id="_x0000_i1027" src="https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2022/images/sa_footer.png" alt="William A. Brookshire Department of Chemical and Biomolecular Engineering"></span></a><o:p></o:p></span></p>
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