- Printable/Flexible Batteries
- Organic-based All-solid-state Batteries
- Battery Electrolytes, Binders, and Separators

1997 ~ 2008 Principla Researcher, Batteries R&D, LG Chem
2001 ~ 2002 Post Doc. Max Planck Institute for Polymer Research
2013 ~ 2020 Professor, Dept. of Energy & Chem. Eng., UNIST
2014 ~ 2020 Director, BK21 Program., UNIST
2015 ~ 2020 Head, Dept. of Energy & Chem. Eng., UNIST
2021 ~ present Underwood Distinguished Professor, Dept. of Chem. & Biomol. Eng., Yonsei Univ.
2022 ~ present Head, Dept. of Battery Conflation Eng., Yonsei Univ.
2022 ~ present Director, Yonsei Battery Research Center, Yonsei Univ.
2021 ~ present Director, BK21 Plus Program. Eng., Yonsei Univ.

2017 Top 100 National R&D Achievements, NRF
2019 Top 100 National R&D Achievements, NRF
2023 Member, The National Academy of Engineering of Korea