# Yoon Seok Jung

**Yoon Seok Jung** (정윤석) is a South Korean battery materials scientist, Professor of Chemical and Biomolecular Engineering at [Yonsei University](https://www.edgepedia.org/yonsei-university) since September 2023, known for work on sulfide solid electrolytes and all-solid-state batteries.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup><sup> • </sup><sup>[2](https://imlb.org/imlb_speakers/yoon-seok-jung/)</sup> His research interests cover rechargeable lithium and sodium-ion batteries, all-solid-state batteries, and atomic layer deposition (ALD), a thin-film coating method.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> He has published over 110 papers, more than half of them on solid-state batteries.<sup>[3](https://doi.org/10.1021/acsaem.5c02558)</sup> He holds a Yonsei Underwood Distinguished Professor appointment.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup>

| Fact | Detail |
|---|---|
| Current position | Professor, Dept. of Chemical and Biomolecular Engineering, Yonsei University, since September 2023<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> |
| Training | Ph.D. 2008, Seoul National University, advised by Seung M. Oh; B.S. 2001, SNU<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> |
| Postdoctoral work | University of Colorado Boulder (2008–2009), University of Texas at Austin (2009), NREL (2009–2011)<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> |
| Earlier posts | UNIST 2011–2018; Hanyang University 2018–2020<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> |
| Named chair | Yonsei Underwood Distinguished Professor, 2023<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> |
| Signature work | Fluoride solid electrolyte LiCl–4Li₂TiF₆ stable beyond 5 V, *Nature Energy*, 2025<sup>[4](https://e3.eurekalert.org/news-releases/1103856)</sup> |
| Editorial role | Associate Editor, *ACS Applied Energy Materials*, from August 2025<sup>[3](https://doi.org/10.1021/acsaem.5c02558)</sup> |

## Education and career

Jung received his B.S. in 2001 from [Seoul National University](https://www.edgepedia.org/seoul-national-university) and his Ph.D. in 2008 from its School of Chemical and Biological Engineering; his thesis concerned improving the cycle performance and thermo-electrochemical activation of lithium-alloy-based anode materials, under Professor Seung M. Oh.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> He then held three postdoctoral positions: at the University of Colorado at Boulder (2008–2009), the [University of Texas at Austin](https://www.edgepedia.org/university-of-texas-at-austin) (2009), and the [National Renewable Energy Laboratory](https://www.edgepedia.org/national-renewable-energy-laboratory)'s Center for Transportation Technologies and Systems (2009–2011).<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup><sup> • </sup><sup>[3](https://doi.org/10.1021/acsaem.5c02558)</sup>

His academic appointments form a dated sequence. He was Associate Professor in the Department of Energy Engineering at [Hanyang University](https://www.edgepedia.org/hanyang-university) from March 2018 to August 2020.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> He then moved to Yonsei University as Associate Professor of Chemical and Biomolecular Engineering in September 2020 and has been full Professor there since September 2023.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup>

## Research

Jung's field is electrochemistry for energy storage, centered on inorganic solid electrolytes: solid materials that conduct lithium ions and can replace the flammable liquid electrolytes in today's cells. His seminar abstract states that practical all-solid-state batteries require solid electrolytes with ionic conductivity of at least 10⁻³ S cm⁻¹ at room temperature, mechanical sinterability, and cost-effective constituent elements.<sup>[5](https://mae.osu.edu/events/2025/10/advancing-inorganic-solid-electrolytes-all-solid-state-batteries)</sup> [Sulfide](https://www.edgepedia.org/sulfide) electrolytes such as Li₆PS₅Cl and halide electrolytes such as Li₂ZrCl₆ meet these requirements; halide electrolytes are additionally stable against oxidation above 4 V versus Li/Li⁺. Both families suffer from poor air stability.<sup>[5](https://mae.osu.edu/events/2025/10/advancing-inorganic-solid-electrolytes-all-solid-state-batteries)</sup>

A second theme is the interface between electrode active materials and the solid electrolyte, which can degrade under the repeated volume changes that electrodes undergo during cycling.<sup>[5](https://mae.osu.edu/events/2025/10/advancing-inorganic-solid-electrolytes-all-solid-state-batteries)</sup> His group's stated research interests also include ALD for battery materials.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup>

## Representative work

His 2025 *Nature Energy* paper, made available online on October 3, 2025, reported a fluoride solid electrolyte, LiCl–4Li₂TiF₆, that remains stable beyond 5 V with a Li⁺ conductivity of 1.7 × 10⁻⁵ S/cm at 30 °C. Conventional sulfide and oxide solid electrolytes tend to break down above 4 V, so this electrolyte enabled high-voltage spinel cathodes such as LiNi₀.₅Mn₁.₅O₄ in all-solid-state cells; a cell retained over 75% capacity after 500 cycles and supported an areal capacity of 35.3 mAh/cm², described as a record for solid-state systems.<sup>[4](https://e3.eurekalert.org/news-releases/1103856)</sup>

## Recent developments

Jung became full Professor at Yonsei in September 2023 and was named a 2023 Underwood Distinguished Professor.<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup> His 2024–2026 output has concentrated on high-voltage fluoride and oxyfluoride electrolytes and on the mechanical durability of practical cells: a 2026 *Advanced Materials* paper on chemo-mechanical failure and reinforcement of solid electrolyte films; a 2026 *Energy Storage Materials* paper on vacancy-induced Li⁺ conduction in Li₃₋ₓAl₁₋ₓTiₓF₆ for 5 V cells; a 2026 invited *ACS Energy Letters* perspective on the solvent footprint of wet-chemical processing of sulfide electrolytes; and a 2026 *JACS* paper on Li₁₊ₓTaOₓF₆₋ₓ oxyfluoride electrolytes.<sup>[6](http://yoonsjung.yonsei.ac.kr/bbs/board.php?category=2026&tbl=publication)</sup> He is an invited speaker at IMLB 2026 with the presentation "Enabling Li metal and Si electrodes for All-Solid-State Pouch Cells".<sup>[2](https://imlb.org/imlb_speakers/yoon-seok-jung/)</sup>

The 2026 *Advanced Materials* pouch-cell work showed that modifying the chemical interactions between Li₆PS₅Cl and nitrile butadiene rubber binders enhances mechanical robustness and lithium-metal compatibility even under 450 MPa isostatic pressing. The resulting LiNi₀.₇₀Co₀.₁₅Mn||Li pouch cells, built without interlayers by single-step pressurization, achieved 400-cycle stability at 60 °C and reliable operation at 30 °C at 3 MPa, and a proof-of-concept bipolar-stacked pouch cell demonstrated scalability.<sup>[7](https://yonsei.elsevierpure.com/en/publications/chemo-mechanical-failure-and-reinforcement-of-solid-electrolyte-f/)</sup>

## Honors, editorial roles and industry links

Beyond the Underwood Distinguished Professorship, Jung received other honors. ACS announced in September 2025 that he joined *ACS Applied Energy Materials* as Associate Editor in August 2025; he had earlier served as Guest Editor of *Energy Storage Materials* (2019–2021) and on the editorial boards of *Batteries & Supercaps* (2017–2024) and *Scientific Reports* (2015–2024).<sup>[1](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)</sup><sup> • </sup><sup>[3](https://doi.org/10.1021/acsaem.5c02558)</sup> 

## References

1. [Yoon Seok Jung's Lab, Electrochemical Energy Storage Lab (CV page), Yonsei University](http://yoonsjung.yonsei.ac.kr/sub02/sub01.php)
2. [Yoon Seok Jung, IMLB 2026 speaker biography](https://imlb.org/imlb_speakers/yoon-seok-jung/)
3. [Welcoming a New Associate Editor to ACS Applied Energy Materials: Professor Yoon Seok Jung](https://doi.org/10.1021/acsaem.5c02558)
4. [Yonsei University develops a new era of high-voltage solid-state batteries (EurekAlert)](https://e3.eurekalert.org/news-releases/1103856)
5. [Advancing Inorganic Solid Electrolytes for All-Solid-State Batteries (Ohio State seminar abstract)](https://mae.osu.edu/events/2025/10/advancing-inorganic-solid-electrolytes-all-solid-state-batteries)
6. [Yoon Seok Jung's Lab, Publications (2026)](http://yoonsjung.yonsei.ac.kr/bbs/board.php?category=2026&tbl=publication)
7. [Chemo-Mechanical Failure and Reinforcement of Solid Electrolyte Films for Practical All-Solid-State Li Metal Pouch Cells (Yonsei Pure record)](https://yonsei.elsevierpure.com/en/publications/chemo-mechanical-failure-and-reinforcement-of-solid-electrolyte-f/)

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*Topic: Encyclopedia › Technology and the built world › Engineers and computer scientists › Engineers and materials scientists › Researchers in chemical engineering, batteries, solar, and energy materials › Lithium-ion and solid-state batteries*

*Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026 · Edited: Sep 25, 2026; Oct 11, 2026; Oct 15, 2026 · Last review: Sep 25, 2026*

*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*

License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license