High Temperature Flexible Supercapacitors
Ho Seok Park
School of Chemical Engineering, Sungkyunkwan University (SKKU)
Abstract: With increasing demand for high performance energy storage systems, the feasibility of reliable and functional energy storage devices that well operates under extreme conditions is of prime importance for expanding applicative fields as well as for understanding materials’ intrinsic and extrinsic properties and device physics. Our group has been investigating ultracapacitive energy storage materials and devices operating under limited circumstances, where conditions are classified into thermodynamic (e.g. pressure, volume and temperature) and kinetic (e.g. high rate and frequency) variables. In this talk, I will introduce high temperature operating, flexible supercapacitors based on graphene electrodes and polymer or gel electrolytes that can efficiently deliver electrical energy under electrochemical, mechanical and thermal stresses. In order to achieve high performance supercapacitor devices under thermal, mechanical and electrochemical stresses, the micro- and macroscopic structures and chemical compositions of graphenes are delicately controlled by chemical modification. For the case of electrolyte materials, both of electrochemical properties and mechanical integrity should be satisfied for high temperature device applications. A new generation of flexible supercapacitors, with the long-term durability and outstanding electrochemical properties, were realized, showing a high position of the Ragone plot, even under severe conditions.
Biography: Prof. Ho Seok Park is an associate professor of Chemical Engineering at the Sungkyunkwan University (SKKU) as well as an adjunct professor at the Samsung Advanced Institute for Health Science & Technology (SAIHST). He received his Ph.D. from Korea Advanced Institute of Science & Technology (KAIST) in 2008 and worked as a Postdoctoral Researcher in the Department of Biological Engineering at Massachusetts Institute of Technology (MIT) from 2008 to 2010. After that, he joined the faculty of Chemical Engineering Department, Kyung Hee University in 2010 then transferred to SKKU in 2014. His current research interests focus on energy and chemical storage materials and devices based on 2D, carbon and hybrid nanomaterials. He has published ~120 peer-reviewed papers in the top journals including JACS, EES, Nano Lett, ACS Nano, Adv Energy Mater, Adv Funct Mater, Nano Energy, etc and being taking editorial board member in the SCI(E) journals such as Macromolecular Research and Carbon Letters.