Journalartikel

Autorenliste: Koerver, R; Walther, F; Aygun, I; Sann, J; Dietrich, C; Zeier, WG; Janek, J

Jahr der Veröffentlichung: 2017

Seiten: 22750-22760

Zeitschrift: Journal of Materials Chemistry A: materials for energy and sustainability

Bandnummer: 5

Heftnummer: 43

ISSN: 2050-7488

DOI Link: https://doi.org/10.1039/c7ta07641j

Verlag: Royal Society of Chemistry

Abstract: 
All-solid-state batteries are expected to provide a next-generation solution for energy storage. Employing fast conducting lithium thiophosphates as a replacement for liquid electrolytes in conventional lithium ion batteries has shown great promise, however, capacity fading and the underlying interfacial side reactions of thiophosphates and cathode active materials are not yet understood well. In this study, we charge solid-state batteries to different cut-off potentials and find the formation of a redox-active resistive layer in the solid electrolyte, which impedes the conductivity depending on the state-of-charge of the battery. Using electrochemical impedance spectroscopy as well as depth profiling with X-ray photoelectron spectroscopy we find a thick passivation layer at the current collector and decomposition products within the cathode composite. In addition, an in situ electrochemical experiment during X-ray photoelectron spectroscopy shows that the solid electrolyte is redox active at the cathode/solid electrolyte interface in solid-state batteries. This work highlights the importance of protecting interface layers at the current collector, and the influence of the resulting electric potential drop, as well as provides insight into the redox chemistry of lithium conducting thiophosphates.

Harvard-Zitierstil: Koerver, R., Walther, F., Aygun, I., Sann, J., Dietrich, C., Zeier, W., et al. (2017) Redox-active cathode interphases in solid-state batteries, Journal of Materials Chemistry A: materials for energy and sustainability, 5(43), pp. 22750-22760. https://doi.org/10.1039/c7ta07641j

APA-Zitierstil: Koerver, R., Walther, F., Aygun, I., Sann, J., Dietrich, C., Zeier, W., & Janek, J. (2017). Redox-active cathode interphases in solid-state batteries. Journal of Materials Chemistry A: materials for energy and sustainability. 5(43), 22750-22760. https://doi.org/10.1039/c7ta07641j