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SUMMARY:Physical Chemistry Seminar 228: Raphaele Clement
DESCRIPTION:Prof. Clement Flyer \nLinking Synthesis\, Composition\, and Performance in Li-ion and Na-ion Battery Materials Using Magnetic Resonance Tools \nAbstract: Batteries have transformed our daily lives and hold the key to a low carbon future. Yet\, current Li-ion chemistries are approaching their theoretical performance limit. Remarkably\, we continue to rely on a limited subset of Li-ion battery materials –– most commercial cathodes derive from LiCoO2 developed in 1980 –– that cannot meet our ever-growing need for energy storage. The development of more sustainable\, energy dense\, and/or safer batteries hinges on designing new cathode chemistries and crystal structures that depart from the traditional layered transition metal oxides\, as well as non flammable solid electrolytes. \nIn this talk\, I will present our recent work combining solid-state NMR\, first principles simulations\, and other advanced tools to relate synthesis\, structure\, and properties in various classes of battery materials. For example\, our work on Li-ion rocksalt oxyfluoride cathodes emphasizes the importance of 7Li/19F solid-state NMR to determine the true composition of such systems and establish robust materials design rules\, and introduces a new\, rapid and energy-efficient synthesis procedure to obtain those materials. Our work on Li- and Na-ion conducting rocksalt halide electrolytes reveals their high propensity for polymorphism and for the formation of planar defects\, with resulting structural and ion conduction properties that can be modulated by changing the synthesis conditions.
URL:https://www.chemistry.ucla.edu/events/physical-chemistry-seminar-228-raphaele-clement/
LOCATION:Mani L. Bhaumik Centennial Collaboratory\, 607 Charles E. Young Dr.\, East\, Los Angeles\, CA\, 90095\, United States
CATEGORIES:Physical Chemistry Seminar
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