Abstract

Although lithium-ion batteries and supercapacitors have shown rapid progress over the last two decades, next-generation energy storage applications, such as fast-evolving portable electronics, electrified propulsion, and load-leveling for renewable energy systems, require multi-functional energy sources that have both high-energy and -power, long cycle life, and flexibility, exceeding the performance of conventional energy storage devices. Aiming towards such advanced energy storage technologies, Dr. Lee’s research pays particular attention to harnessing charge storage reactions of nanostructured electrodes and their nano-fabrication processes. In this presentation, we will discuss our recent progress on designing multi-functional electrode materials. We will first show that redox-active organic electrodes prepared from earth-abundant organic materials can be promising cathodes for large-scale energy storage devices. We reveal that these organic electrodes have promising charge storage properties for both Li- and Na-ion storage. The assembled organic electrodes are employed as cathodes for hybrid capacitors and Li- and Na-ion batteries, delivering high capacity with superior power capability and cycling stability. Thus, these high-performance organic electrodes can be promising cathodes for large-scale rechargeable batteries or hybrid capacitors. Next, we will introduce a new self-assembly technique, called a ligand-exchange induced layer-by-layer assembly, which can fine-tune the interface structures of the assembled nanoparticles. Based on this technique, we systematically assemble the 3D nanostructured electrodes consisting of conductive and charge storage nanoparticles with controlled distance, composition, and alignment. We control the interface structures and corresponding charge transfer and storage properties of the assembled 3D nanostructured electrodes, demonstrating flexible and wearable energy storage and conversion devices.

Biography

Seung Woo Lee received his B.S. in Chemical Engineering from Seoul National University with Summa cum laude in 2004 and Ph.D. in Chemical Engineering from Massachusetts Institute of Technology in 2010. He joined the Woodruff School of Mechanical Engineering at Georgia Institute of Technology as an assistant professor in January 2013. Dr. Lee is an expert of electrochemical energy storage and conversion systems, which are the key enabling technologies to support fast-evolving consumer electronics and electric vehicles. Dr. Lee has published more than 60 articles in peer-reviewed journals with very high citations, showing the broad impact of this research on the research community of electrochemical systems. In particular, he has developed high-performance nanostructured organic electrodes using the surface redox reactions for advanced lithium-ion batteries and supercapacitors. His work has been published in Nature Nanotechnology, Nature Communications, Energy & Environmental Science, and featured in many public news articles. Dr. Lee is the recipient of the Sigma Xi Young Faculty Award (2019), the NASA Early Career Faculty Award (2018), the NSF CAREER award (2018), the Samsung Global Research Outreach Award (2014 and 2018).

초청자 : 융합과학부 나노융합전공 김연상 교수(연락처 : 031-888-9131, younskim@snu.ac.kr)