Tuesday, September 20, 2016 -
3:00pm to 4:00pm
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209 Pierce Hall, 29 Oxford St., Cambridge

Widely Applied Mathematics Seminar

Martin Z. Bazant, MIT, will present on the topic "Control of Phase Transformations in Rechargeable Batteries." The rapid, stable cycling of rechargeable batteries requires well-controlled phase transformations of the redox active materials in each electrode, between the charged and discharged states. Three examples will be discussed: 1) In Li-ion batteries, common intercalation materials, such as iron phosphate and graphite, undergo phase separation (into Li-rich and Li-poor phases), which limits the power density and leads to degradation.  A general mathematical theory, supported by recent x-ray imaging experiments, will be presented that shows how phase separation can be suppressed by concentration-dependent reaction resistance. 2) In Li-air batteries, the same theory, applied to electrodeposition of Li2O2, reveals a fundamental rate limitation, unfortunately far below the needs of electric vehicles.  3) Finally, in Li-metal batteries, theoretical and experimental results will be presented regarding the control of morphological instabilities in lithium electrodeposition, which must be achieved to ensure safety and long cycle life.

Speaker Bio: Martin Z. Bazant is the E. G. Roos (1944) Professor of Chemical Engineering and Mathematics at the Massachusetts Institute of Technology.  After a PhD in Physics at Harvard University (1997), he joined the MIT faculty in Mathematics (1998) and then Chemical Engineering (2008), where he currently serves as Executive Officer.   His research combines theory, computation and experiments in diverse fields, with emphasis on electrochemistry and electrokinetics.  His contributions have been recognized by the Alexander Kuznetsov Prize in Theoretical Electrochemistry (ISE), Global Climate and Energy Project Chair (Stanford), Paris Sciences Chair (ESPCI), Brilliant Ten (Popular Science), Lighthill Lecture in Applied Mathematics (IMA), Winchell Lecture in Materials Science (Purdue), and Corrsin Lecture in Fluid Dynamics (Johns Hopkins).   He serves on the editorial board of SIAM Journal of Applied Mathematics and Scientific Reports and is the Chief Scientific Advisor for Saint Gobain Ceramics and Plastics, Northboro R&D Center.

Contact Name: 

Alpha Lee

Research Areas: 

Harvard University
Center for the Environment

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