KEIDS4-1661

Interfacial Evolution and Engineering in High-Energy All-Solid-State Batteries

Topic

IDS4. Advanced Battery Materials and Interface Engineering for Next-Generation Batteries (Sponsored by EcoPro BM)

When and Where

Sep 29, 2026 10:50 - 11:15

Room 202

Session Chairs

Hongkyung LEE

Presenter(s)

Yoon Seok Jung (Yonsei University)

Co-Author(s)

No co-authors

Abstract

All-solid-state batteries (ASSBs) with highly conductive and mechanically sinterable sulfide solid electrolytes are widely regarded as a promising solution to key challenges associated with conventional lithium-ion batteries, including safety concerns and limited energy density. However, the intrinsically narrow electrochemical stability windows of sulfide solid electrolytes constrain their compatibility with both cathodes and anodes. In particular, their limited oxidative stability, typically ~3 V (vs. Li/Li+), necessitates extensive interfacial engineering, such as LiNbO₃ coatings, when paired with 4 V-class layered oxide cathodes. In this regard, oxidatively stable chloride and oxychloride solid electrolytes that combine high ionic conductivity with mechanical sinterability have attracted much attention as promising alternatives. Nonetheless, their intrinsic oxidative stability is generally limited to ~4.2 V (vs. Li/Li⁺). Accordingly, enabling operation at even higher voltages require further advances in both materials and electrode architecture.
In this presentation, we will discuss our recent progress in the development of advanced halide solid electrolytes, with particular emphasis on new fluoride solid electrolytes. The potential for integrating these materials into practically relevant pouch cells will also be demonstrated.

(1) J. P. Son, et al., Nat. Energy 2025, 10, 1334.

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