Journal article

Publication year: 2018

Pages: 20088-20095

Journal: Physical Chemistry Chemical Physics

Volume number: 20

Issue number: 30

ISSN: 1463-9076

DOI Link: https://doi.org/10.1039/c8cp01968a

Publisher: Royal Society of Chemistry

Abstract: 
Inspired by reports of redox active interphases in all-solid-state batteries employing fast conducting lithium thiophosphate solid-state electrolytes, we investigated the compositional depolymerization of interconnected PS4 tetrahedra in (Li2S)(x)(P2S5)(100-x) glasses (50 < x < 80) by X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS). Based on the observed energy shifts with composition, we present a structural model of the three different bonding types describing the structures of either crystalline or amorphous thiophosphates. This model and reference data characterizes amorphous thiophosphates based on their inter-tetrahedral connectivity and helps to distinguish malign decomposition reactions from reversible redox reactions at the cathode active material/solid-state electrolyte interface. This work highlights the importance of a combined analytical approach and appropriate reference compounds to elucidate the interface reactions in all-solid-state battery systems.

Harvard Citation style: Dietrich, C., Koerver, R., Gaultois, M., Kieslich, G., Cibin, G., Janek, J., et al. (2018) Spectroscopic characterization of lithium thiophosphates by XPS and XAS - a model to help monitor interfacial reactions in all-solid-state batteries, Physical Chemistry Chemical Physics, 20(30), pp. 20088-20095. https://doi.org/10.1039/c8cp01968a

APA Citation style: Dietrich, C., Koerver, R., Gaultois, M., Kieslich, G., Cibin, G., Janek, J., & Zeier, W. (2018). Spectroscopic characterization of lithium thiophosphates by XPS and XAS - a model to help monitor interfacial reactions in all-solid-state batteries. Physical Chemistry Chemical Physics. 20(30), 20088-20095. https://doi.org/10.1039/c8cp01968a