Journal article

Authors list: Fenske, Hans; Lombardo, Teo; Gerstenberg, Jessica; Kern, Christine; Steckermeier, Dominik; Michalowski, Peter; Janek, Jürgen; Kwade, Arno

Publication year: 2024

Journal: Journal of The Electrochemical Society

Volume number: 171

Issue number: 4

ISSN: 0013-4651

eISSN: 1945-7111

Open access status: Hybrid

DOI Link: https://doi.org/10.1149/1945-7111/ad3856

Publisher: The Electrochemical Society

Abstract: 
Prelithiation is widely recognized as a promising technology to enable the use of high capacity anode active materials such as silicon. Numerous prelithiation techniques have been proposed over the years, with a handful successfully undergoing pilot scale testing. Nevertheless, new challenges arise when moving from optimizing single processes to integrating them into the process chain. A major concern is the stability of prelithiated electrodes against moisture. In this study, we investigate the influence of industrially-relevant moisture levels on the electrochemical performance of prelithiated graphite/SiOx composite anodes in 3-electrode half- and full-cells. We identify several indicators of electrode degradation such as an increase in open circuit potential, a decrease in graphite lithiation potential, and changes in specific charge/discharge capacity. The underlying degradation mechanisms are examined using electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry, which show increased solid electrolyte interphase (SEI)-related interfacial resistances but no clear evidence of SEI degradation. Based on the experimental results, we define a process window for the stability of the investigated electrodes as a function of dew point and exposure time. Our results indicate an encouragingly high stability at dew points up to -40 C-degrees for a realistic exposure time of 1 h.

Harvard Citation style: Fenske, H., Lombardo, T., Gerstenberg, J., Kern, C., Steckermeier, D., Michalowski, P., et al. (2024) Influence of Moisture on the Electrochemical Performance of Prelithiated Graphite/SiOx Composite Anodes for Li-Ion Batteries, Journal of The Electrochemical Society, 171(4), Article 040511. https://doi.org/10.1149/1945-7111/ad3856

APA Citation style: Fenske, H., Lombardo, T., Gerstenberg, J., Kern, C., Steckermeier, D., Michalowski, P., Janek, J., & Kwade, A. (2024). Influence of Moisture on the Electrochemical Performance of Prelithiated Graphite/SiOx Composite Anodes for Li-Ion Batteries. Journal of The Electrochemical Society. 171(4), Article 040511. https://doi.org/10.1149/1945-7111/ad3856