Shear force effect of the dry process on cathode contact coverage in all-solid-state batteries

Dongkyu Lee, Yejin Shim, Youngsung Kim, Guhan Kwon, Seung Ho Choi (), KyungSu Kim () and Dong-Joo Yoo ()
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Dongkyu Lee: Korea University
Yejin Shim: Korea University
Youngsung Kim: LG Electronics Incorporation
Guhan Kwon: LG Electronics Incorporation
Seung Ho Choi: Korea Electronics Technology Institute
KyungSu Kim: Korea Electronics Technology Institute
Dong-Joo Yoo: Korea University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The state-of-the-art all-solid-state batteries have emerged as an alternative to the traditional flammable lithium-ion batteries, offering higher energy density and safety. Nevertheless, insufficient intimate contact at electrode-electrolyte surface limits their stability and electrochemical performance, hindering the commercialization of all-solid-state batteries. Herein, we conduct a systematic investigation into the effects of shear force in the dry electrode process by comparing binder-free hand-mixed pellets, wet-processed electrodes, and dry-processed electrodes. Through digitally processed images, we quantify a critical factor, ‘coverage’, the percentage of electrolyte-covered surface area of the active materials. The coverage of dry electrodes was significantly higher (67.2%) than those of pellets (30.6%) and wet electrodes (33.3%), enabling superior rate capability and cyclability. A physics-based electrochemical model highlights the effects of solid diffusion by elucidating the impact of coverage on active material utilization under various current densities. These results underscore the pivotal role of the electrode fabrication process, with the focus on the critical factor of coverage.

Date: 2024
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DOI: 10.1038/s41467-024-49183-3

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