Speaker:Mohammed Ahmed Zabara, Sabancı University, SUNUM

Title: Electrochemical Impedance Spectroscopy based Characterization and Modeling Techniques for Electrochemical Energy Storage Systems

Date/Time:07 December 2022 / 13:40 - 14:30

Location:FENS L027 (Physical only)

Abstract:Understanding the underlying processes in electrochemical energy storage systems is crucial for their development and application. Systems such as Lithium batteries are difficult to characterize due to the high reactivity of their components which require measurements in sealed environment. Electrochemical Impedance Spectroscopy (EIS) is very useful in that aspect because of its non-invasive, in-situ nature and its ability to resolve various electrochemical processes in their time constants. In this talk, I will show how valuable knowledge regarding the charge and mass transfer of Li-ions, the formation of Solid Electrolyte Interface and the determination of the State-of-Charge of primary batteries with metallic Li anodes can be extracted using EIS. Moreover, I will demonstrate the extension of EIS analysis to include non-linear harmonics of the data which provide conclusions about the electrochemical processes in the systems. Finally, I will show how EIS data can be used to predict and simulate the behavior of not only individual electrochemical energy storage systems but also the combination of hybrid systems such as parallel combination of secondary Li batteries and supercapacitors.

Bio: Dr. Mohammed Ahmed Zabara is a project researcher in Sabancı University Nanotechnology Research and Development Center (SUNUM). He holds BS (2013) and MSc (2016) degrees in Chemistry from Middle East Technical University. He obtained his PhD from Bilkent University, Chemistry Department in 2021 under the supervision of Assoc prof. Burak Ülgüt. His work was mainly in utilizing Electrochemical Impedance Spectroscopy (EIS) technique for characterizing and modeling primary/secondary Lithium batteries and supercapacitors. He is interested in investigating the electrochemistry of active materials and interfaces of electrochemical energy storage and conversion systems such as Li batteries, supercapacitors, and fuel cells. He researches and develops methods for improving the application of EIS to characterize electrochemical systems. Besides that, his research includes the development of nanomaterials for electrochemical applications such as sensing,energy storage and photo/electrocatalysis.