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Friday, March 9, 2018 at 1:00pm
"In Situ Synchrotron X-ray Studies on Synthesis of Cathode Materials for Li-ion Batteries"
Abstract: Synthesizing new electrode materials with desired phases and properties has often been found difficult and mostly relies on trial and error since there are a variety of parameters that can have a strong influence on the structural and electrochemical properties of synthesized materials. On the other hand, materials synthesis is complex and often undertaken under non-equilibrium conditions, therefore making it challenging to predict the reaction pathways by theory. In situ, real-time tracking of the evolution of structural chemistry during synthesis can provide details on reaction process, elucidating intermediate phases and how temperature, pressure, time and the precursor concentrations affect the kinetic reaction pathways. Synchrotron X-ray powder diffraction (SXPD), with high beam intensity and angular resolution, allows catching transient phases and subtle structural changes in the intermediates during synthesis. The presentation will introduce the in situ SXPD techniques as applied in studying synthesis of cathode materials for Li-ion batteries. Specific examples will be given to show how the insights gained from in situ studies may provide guidance to rational design and synthesis of new battery materials.