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Investigations into the superionic glass phase of Li$_{4}$PS$_{4}$I for improving the stability of high-loading all-solid-state batteries

Strauss, Florian; Teo, Jun Hao; Janek, Jürgen; Brezesinski, Torsten

In recent years, investigations into improving the performance of bulk-type solid-state batteries (SSBs) have attracted much attention. This is due, in part, to the fact that they offer an opportunity to outperform the present Li-ion battery technology in terms of energy density. Ni-rich Li$_{1+x}$(Ni$_{1-y-z}$Co$_{y}$Mn$_{z}$)$_{1-x}$O$_{2}$ (NCM) and lithium-thiophosphate-based solid electrolytes appear to be a promising material combination for application at the cathode side. Here, we report about exploratory investigations into the 1.5Li$_{2}$S/0.5P$_{2}$S$_{5}$/LiI phase system and demonstrate that a glassy solid electrolyte has more than an order of magnitude higher room-temperature ionic conductivity than the crystalline counterpart, tetragonal Li$_{4}$PS$_{4}$I with the P4/nmm space group (∼1.3 versus ∼0.2 mS cm$^{-1}$). In addition, preliminary results show that usage of the glassy 1.5Li$_{2}$S–0.5P$_{2}$S$_{5}$–LiI in pellet stack SSB cells with an NCM622 (60% Ni content) cathode and a Li$_{4}$Ti$_{5}$O$_{12}$ anode leads to enhanced capacity retention when compared to the frequently employed argyrodite Li$_{6}$PS$_{5}$Cl solid electrolyte. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000126947
Veröffentlicht am 01.12.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2052-1545, 2052-1553
KITopen-ID: 1000126947
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Inorganic chemistry frontiers
Verlag Royal Society of Chemistry (RSC)
Band 7
Heft 20
Seiten 3953-3960
Vorab online veröffentlicht am 17.08.2020
Nachgewiesen in Scopus
Web of Science
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