Seminar & Colloquium
[세미나: 7월 14일(금), 오후 4시] Prof. JAE CHUL KIM, Stevens Institute of Technology
Title
Designing reversible electro-chemo-mechanical reactions in alkali-ion batteries
Speaker
Prof. JAE CHUL KIM, Stevens Institute of Technology
Education
- 2014 Ph.D., Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA
- 2007 M.E., Materials Science and Engineering, Korea University, Seoul, Korea
- 2005 B.E. with Honors, Materials Science and Engineering, Korea University, Seoul, Korea
Experience
- 2020. 2. ~ Present Visiting Professor, Department of Materials Science and Engineering, Korea University, Seoul, Korea
- 2015. 10. ~ 2018. 7. Postdoctoral Fellow, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA
- 2013. 12. ~ 2015. 10. Postdoctoral Associate, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA
| Date | Friday, July 14th, 2023
| Time | 16:00 ~
| Venue | 33동 125호 (WCU 다목적실)
[Abstract]
As the market for large-scale batteries rapidly evolves, the need for next-generation batteries
continues to grow. In this talk, various promising next-generation batteries will be highlighted.
First, a new battery construction that physically does not require anode materials will be introduced.
The concept of this “anode-free” battery was proposed to achieve high energy density with
improved safety. However, practical use of anode-free batteries faces challenges due to
fundamental problems associated with their poor Coulombic efficiency and substantial volume
change of the anode-side. We will discuss how to shift energetics of Li plating and stripping in
anode-free batteries by employing three-dimensional frameworks as a current collector. Also,
factors to unlock the potential of anode-free batteries will be demonstrated. Mechanically robust
structures enable reversible Li cycling by suppressing volume change over the extended number
of cycles. In the context, the practical applications of anode-free batteries will also be discussed.
Second, challenges and opportunities in K-ion batteries will be discussed. As an alternative to Libased technologies to develop stationary energy storage systems, K-ion batteries have attracted
substantial interest. However, unlike Na-ion batteries that are considered ready for market
penetration, the development of K-ion batteries is in infancy, especially for their cathode materials.
To bridge the technology gap in K storage, materials design principles to systematically advance
K-ion cathodes need to be established. Developing cathode materials that host large K ions requires
a different perspective from developing cathode materials for smaller ions due to strong Coulombic
interactions between K ions. Polyanionic materials provide a stable framework to reversibly store
and release K as a cathode material for K-ion batteries. KVPO4F that operates at 4.3 V average
redox potential is one of the most energy-dense polyanionic cathodes. In this talk, how cation and
anion mixing affect the K-K interactions and resulting electrochemical properties of KVPO4F will
be discussed.
| Host | 강기석 교수(02-880-7088)