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The Hidden Side of Nanoporous β‐Li 3 PS 4 Solid Electrolyte
Author(s) -
Marchini Florencia,
Porcheron Benjamin,
Rousse Gwenaelle,
Albero Blanquer Laura,
Droguet Léa,
Foix Dominique,
Koç Tuncay,
Deschamps Michael,
Tarascon Jean Marie
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202101111
Subject(s) - materials science , nanoporous , ionic conductivity , electrolyte , amorphous solid , fast ion conductor , sulfide , conductivity , raman spectroscopy , x ray photoelectron spectroscopy , ionic bonding , phase (matter) , chemical engineering , chemistry , crystallography , nanotechnology , ion , organic chemistry , electrode , physics , engineering , optics , metallurgy
Solid‐state batteries are enjoying a regained interest owing to the discovery of sulfide‐based solid electrolytes with ionic conductivities comparable to their liquid counterparts. Among them, the metastable β‐Li 3 PS 4 polymorph has attracted great attention given its high room temperature ionic conductivity (≈0.15 mS cm −1 ) when synthesized via a solvent‐mediated route. However, the origin of such a high conductivity together with its structural interplay remains unclear. Herein, an in‐depth study of the THF‐synthesized nanoporous β‐Li 3 PS 4 is reported. Synchrotron X‐ray diffraction, NMR, and Raman spectroscopy confirm the presence of β‐Li 3 PS 4 as the only crystalline phase and also reveal an additional amorphous phase and remnant THF. Moreover, a clear dependence of the ionic conductivity of the material on the relative content of its phases is found, the amorphous one being the most conductive. Lastly, high chemical reactivity is found for the nanoporous β‐Li 3 PS 4 and other phosphosulfide electrolytes toward Li metal, evidenced in the spontaneous ignition when mixed together and further investigated by XRD and XPS. This study, which unveils a hidden side of the THF‐synthesized β‐Li 3 PS 4 and other sulfide solid electrolytes, provides a new insight to the battery community when selecting a proper electrolyte for practical all‐solid state batteries.