세미나

Beyond Li-Ion Batteries: Understanding Electrochemical Reactions via Operando Imaging

Seung-Ho Yu

Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea

 

 

Lithium-ion batteries (LIBs) have been used as the most dominant energy storages for portable electronic devices such as laptops and electrical vehicles for the past decades, but they still cannot meet the demands for high energy density as the technologies are developed. Therefore, it is very urgent to develop new battery system to replace current LIBs. However, the reaction mechanisms of most post Li-ion battery systems are very complicated and complex, so it is required to understand how they work during the charge/discharge for further development.

This presentation will focus on investigating the reaction mechanism of post Li-ion batteries using operando imaging. For example, Li anode has been extensively studied because they have high theoretical specific capacities, but the reaction mechanism is very complex and has not been fully understood. Operando X-ray microscopy was performed to study the evolution of morphology of post Li-ion battery electrodes while operating the battery. Direct observation of morphological evolution of electrode materials during operating the battery can bring us new insights to understand the reaction mechanism.