Seminar & Colloquium
[세미나: 7월 2일(화), 오전 10시 30분] Prof. Yoonseob Kim, The Hong Kong University of Science and Technology
Title
Advanced Polymers for Energy Applications
Speaker
Prof. Yoonseob Kim, Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology
* Education
- 2016 Ph.D., Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, USA
- 2010 B.S., Department of Chemical Engineering, Hanyang University, Korea, Summa Cum Laude
* Professional Experience
- 2019–present Assistant Professor, Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Hong Kong SAR, China
- 2016–2019 Postdoctoral Associate, Department of Chemistry (with Prof. Timothy M. Swager), Massachusetts Institute of Technology, Cambridge, MA, USA
- 2010–2016 Research Assistant, Department of Chemical Engineering (with Prof. Nicholas A. Kotov), University of Michigan, Ann Arbor, MI, USA
- 2009–2010 Visiting Scholar, Department of Chemistry (with Prof. Adam J. Matzger), University of Michigan, Ann Arbor, MI, USA
| Date | Tuesday, July 2nd , 2024
| Time | 10:30 ~
| Venue | 33동 228호
[Abstract]
Polymers are ubiquitous in our daily life—plastic bags, clothes, house furniture, electronic devices, vehicles, etc. The number of applications is countless. One of the recently developed polymers with high porosity and crystallinity, called porous crystalline polymers, includes covalent organic frameworks (COFs). The unique features of those porous polymers, permanent porosity, and crystallinity make them essential in energy engineering applications. COFs with ionic functional groups can transport ions (e.g., Li+, Na+, or Zn2+) rapidly and reliably. Those ionic COFs (iCOFs) are incorporated in energy devices for enhanced transport and safety, outperforming known electrolytes and enabling the next-generation batteries. A primary focus is to make solid-state and single-ion-conducting iCOFs for all-solid-sate Lithium metal batteries. For this goal, we are developing new iCOFs, such as the ones bearing hypervalent nodes, redox-active moieties, or three-dimensional network topologies. We proved that the iCOFs-based batteries have significantly improved safety while keeping the same high performance as those with liquid electrolytes. The iCOFs we have developed showed the highest Li+ conductivity of 9.8 mS cm–1 at r.t. and a transference number of 0.92. The solid-state batteries with iCOFs installed cells showed 188 mAh g–1 at 0.25 C. These findings demonstrate the promise of using redox-active anionic COFs for electrochemical energy storage devices. Adopting such all-solid-state rechargeable batteries will render electric vehicles more robust, safe, and affordable, ultimately leading to improved environmental conditions (Advanced Materials 2021; J. Am. Chem. Soc. 2023; Advanced Energy Materials 2024). Overall, porosity, periodicity, tailorability, and modularity advantages make them the next-generation materials for sustainable energy engineering.
| Host | 한정우 교수(02-880-1608)