Interfacial chemistry-driven reaction dynamics and resultant microstructural evolution in lithium-based all-solid-state batteries

Chanhyun Park, Jingyu Choi, Seojoung Park, Hyeong-Jong Kim, Yunseo Kim, Gukhyun Lim, Juho Lee, Eunryeol Lee, Sugeun Jo, Jiwon Kim, Jinsoo Kim, Jun Lim, Taeseok Kim, Jihyun Hong (), Donghyuk Kim () and Sung-Kyun Jung ()
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Chanhyun Park: Ulsan National Institute of Science and Technology (UNIST)
Jingyu Choi: Ulsan National Institute of Science and Technology (UNIST)
Seojoung Park: Ulsan National Institute of Science and Technology (UNIST)
Hyeong-Jong Kim: Ulsan National Institute of Science and Technology (UNIST)
Yunseo Kim: Ulsan National Institute of Science and Technology (UNIST)
Gukhyun Lim: Pohang University of Science and Technology (POSTECH)
Juho Lee: Ulsan National Institute of Science and Technology (UNIST)
Eunryeol Lee: University of California Berkeley
Sugeun Jo: Pohang University of Science and Technology (POSTECH) 80
Jiwon Kim: Seoul National University
Jinsoo Kim: Ulsan Advanced Energy Technology R&D Center, Korea Institute of Energy Research
Jun Lim: Pohang University of Science and Technology (POSTECH) 80
Taeseok Kim: Company Lomin, JBI Building
Jihyun Hong: Pohang University of Science and Technology (POSTECH)
Donghyuk Kim: Ulsan National Institute of Science and Technology (UNIST)
Sung-Kyun Jung: Seoul National University

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Achieving a comprehensive understanding of battery systems necessitates multi-length scale analysis, from the atomic- to macro-scale, to grasp the complex interplay of phenomena influencing performance. However, studies to understand these phenomena in all-solid-state batteries (ASSBs) poses significant challenges due to the complex microstructural evolution involved, including the pore formation and contact loss resulting from cathode material breathing, chemical degradation at interfaces, and their interplay. Herein, we investigate the impact of chemical degradation on the reaction behavior and microstructural evolution of Ni-rich cathode particle (LiNi0.6Co0.2Mn0.2O2) within composite cathodes of sulfide-based ASSBs, using a well-defined model system incorporating Li-In alloy anodes and a non-decomposable coating layer that solely alters the interfacial chemical reactivity. By using lithium difluorophosphate (LiDFP) to suppress chemical degradation, we observed that this suppression enhances the reaction uniformity among particles and homogenizes mechanical degradation, albeit increasing pore formation and tortuosity. In addition, unbridled chemical degradation induces significant reaction heterogeneity and non-uniform mechanical degradation, with fewer pores and lower tortuosity. These findings complement the understanding of mechanical degradation, which is traditionally described using the metrics of contact loss and tortuosity, and underscore the critical role of coating layers in promoting lithium conduction by maintaining contact with the cathode surface.

Date: 2025
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DOI: 10.1038/s41467-025-63959-1

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