Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Cathode-Electrolyte Interfacial Properties in Solid State Li-Ion Batteries" By Pengyu Xu Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Lia A. Stanciu ABSTRACT Lithium ion batteries (LIBs) have been applied to portable electronics as power source for the past decades. However, the conventional lithium ion batteries suffer greatly from safety issues since the organic electrolytes are flammable. Therefore, replacing organic electrolytes with solid electrolytes (SEs) has been considered as a solution to the safety problem. Solid state electrolytes usually provide boarder electrochemical windows which allow the use of electrode materials with higher capacity and larger potential difference, therefore increase the energy density of batteries. Meanwhile, there are still great challenges encountered when trying to apply SEs to all-solid-state batteries. Poor ionic conductivities of SSEs and high interfacial resistances between SSEs and electrodes are drawbacks that can result in low power densities and inferior cycling performances of the batteries. There is evidence that the formation of inter-electrode films (IEF) at the interface of ceramic compounds could heavily influence the charge transfer kinetics and cost great capacity loss. However, the chemical and thermodynamic properties of the IEFs as well as the phase formation dynamics are still lack of understanding. Our goal is to study the formation of charged IEF, and engineer structurally stable 2D interfacial phases that maximize the interfacial conductivity and mechanical integrity. This is very important to solid state batteries. Date: Tuesday, December 11, 2018 Time: 8:30 A.M. Place: ARMS 3115