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Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Riphaus, Nathalie; Stiaszny, Barbara; Beyer, Hans; Indris, Sylvio; Gasteiger, Hubert A.; Sedlmaier, Stefan J.

Sulfide-based solid electrolytes (SE) are quite attractive for application in all-solid-state batteries (ASSB) due to their high ionic conductivities and low grain boundary resistance. However, limited chemical and electrochemical stability demands for protection on both cathode and anode side. One promising concept to prevent unwanted reactions and simultaneously improve interfacial contacting at the anode side consists in applying a thin polymer film as interlayer between Li metal and the SE. In the present study, we investigated the combination of polyethylene oxide (PEO) based polymer films with the sulfide-based SE Li10SnP2S12 (LSPS). We analyzed their compatibility using both electrochemical and chemical techniques. A steady increase in the cell resistance during calendar aging indicated decomposition reactions at the interfaces. By means of X-ray photoelectron spectroscopy and further analytical methods, the formation of polysulfides, P–[S]n–P like bridged PS43− units and sulfite, SO32−, was demonstrated. We critically discuss potential reasons and propose a plausible mechanism for the degradation of LSPS with PEO. The main objective of this paper is to highlight the importance of understanding interfaces in ASSBs not only from an electrochemical perspective, but also from a chemical point of view.

Verlagsausgabe §
DOI: 10.5445/IR/1000093398
Veröffentlicht am 08.04.2019
DOI: 10.1149/2.0351906jes
Zitationen: 37
Zitationen: 36
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 0013-4651, 1945-7111
KITopen-ID: 1000093398
HGF-Programm 37.01.02 (POF III, LK 01) Components and Cells
Erschienen in Journal of the Electrochemical Society
Verlag Electrochemical Society
Band 166
Heft 6
Seiten A975–A983
Vorab online veröffentlicht am 26.03.2019
Schlagwörter Batteries; All-solid-state battery; polymer electrolyte; sulfide solid electrolyte
Nachgewiesen in Dimensions
Web of Science
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