Seminar & Colloquium
[세미나: 3월 28일(목), 오전 11시] Prof. Hyuksang Kwon, Korea Research Institute of Standards and Science
Title
The development of ex-/in-situ and operando Raman systems for battery materials
Speaker
Prof. Hyuksang Kwon, Korea Research Institute of Standards and Science
* Education
- 2004. 3. ~ 2011. 2. Ph. D & M.S. in Physical Chemistry, Seoul National University
- 1998. 3. ~ 2004. 2. B.S. in Chemistry, Yonsei University
* Experience
- 2023. 3. ~ present Institute Adjunct Professor in Chungnam National University
- 2020. 1. ~ present Principal Research Scientist in KRISS
- 2012. 5. ~ 2019. 12. Senior Researcher in KRISS
- 2011. 3. ~ 2012. 4. Research Professor in Physical Chemistry, Korea University
| Date | Thursday March 28th , 2024
| Time | 11:00 ~
| Venue | 33동 125호(WCU 다목적실)
[Abstract]
Li-ion batteries are becoming the most essential daily necessities in our lives. Under the footsteps of countries toward carbon neutrality, the replacement of eco-friendly (hydrogen, electric) vehicles from gasoline vehicles is progressing rapidly. If the urban air mobility market opens within the next 10 years, the safety and stability of these batteries will become a key issue. Currently, there is a lot of enthusiasm for research on solid batteries using solid electrolytes due to the safety issues of batteries using liquid electrolytes. In the present, research and development of advanced batteries through the use of chemical and electrical stability of solid batteries, high voltage anode materials, and lithium anode materials have been a big topic. In the measurement technology, it is a challenge that is tracking non-uniform electrochemical and interfacial chemical reactions in a cell according to location and to understand the cause of such reactions to pursue sophisticated battery design. Such non-uniform lithiation/delithiation upon material location requires the development of advanced measurement systems.
In situ/operando Raman spectroscopy is the technique to characterize dynamic battery materials under the device operation. In essence, it is the one of the latest state-of-the-art technologies that points to a highly realistic environmental system with the most confidential measurements for the characterization and development of next-generation materials. Crystal structure analysis and multiphase quantitative analysis through XRD are essential methods for conducting secondary battery research. To unravel the crystal phase distinction is ambiguous only by XRD measurement, the Raman structural analysis can be very helpful. We have been made the XRD-Raman dual system, which is advantageous in assessing the non-uniform electrochemical reaction of the active material itself. Also, we made a special coin cell to observe the material behavior. First, we choose the transparent materials that the XRD-Raman light source can transmit and reflect simultaneously. Second, we have manufactured the coin cell with the gap between selected transparent and cathode materials to reduce the background by electrolytes. This cell fabrication enabled XRD-Raman measurements during voltage application. Operando measurement technology, which can observe structural changes of secondary battery materials in the same environment, will be of great help in improving the performance of secondary batteries.
| Host | 최인석 교수(02-880-1712)