Journal article

Authors list: Wenzel, S; Randau, S; Leichtweiss, T; Weber, DA; Sann, J; Zeier, WG; Janek, J

Publication year: 2016

Pages: 2400-2407

Journal: Chemistry of Materials

Volume number: 28

Issue number: 7

ISSN: 0897-4756

eISSN: 1520-5002

DOI Link: https://doi.org/10.1021/acs.chemmater.6b00610

Publisher: American Chemical Society

Abstract: 
The very high ionic conductivity of Li10GeP2S12 (LGPS) makes it a potential solid electrolyte for lithium all-solid-state batteries. Besides the high ionic conductivity, another key requirement is the stability of the solid electrolyte against degradation reactions with the electrodes; here, we analyze the reaction of LGPS with lithium metal. In situ X-ray photoelectron spectroscopy (XPS), in combination with time-resolved electrochemical measurements offers detailed information on the chemical reactions at the Li/LGPS interface. The decomposition of Li10GeP2S12 leads to the formation of an interphase composed of Li3P, Li2S, and Li-Ge alloy, which is in perfect agreement with theoretical predictions, and an increase of the interfacial resistance. These results highlight the necessity to perform long-term, time-resolved electrochemical measurements when evaluating potential new solid electrolytes for solid-state batteries. The kinetics of this interphase growth-comparable to SEI formation on lithium anodes in liquid electrolytes seems to be governed by diffusion across the interphase, as a square root time dependence is observed.

Harvard Citation style: Wenzel, S., Randau, S., Leichtweiss, T., Weber, D., Sann, J., Zeier, W., et al. (2016) Direct Observation of the Interfacial Instability of the Fast Ionic Conductor Li10GeP2S12 at the Lithium Metal Anode, Chemistry of Materials, 28(7), pp. 2400-2407. https://doi.org/10.1021/acs.chemmater.6b00610

APA Citation style: Wenzel, S., Randau, S., Leichtweiss, T., Weber, D., Sann, J., Zeier, W., & Janek, J. (2016). Direct Observation of the Interfacial Instability of the Fast Ionic Conductor Li10GeP2S12 at the Lithium Metal Anode. Chemistry of Materials. 28(7), 2400-2407. https://doi.org/10.1021/acs.chemmater.6b00610