Solvent-mediated synthesis of amorphous Li3PS4/polyethylene oxide composite solid electrolytes with high Li+ conductivity

Ethan C. Self, Zachary D. Hood, Teerth Brahmbhatt, Frank M. Delnick, Harry M. Meyer, Guang Yang, Jennifer L.M. Rupp, Jagjit Nanda

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

24 Zitate (Scopus)

Abstract

Solvent-mediated routes have emerged as an effective, scalable, and low-temperature method to fabricate sulfide-based solid-state electrolytes. However, tuning the synthesis conditions to optimize the electrolyte’s morphology, structure, and electrochemical properties is still underexplored. Here, we report a new class of composite solid electrolytes (SEs) containing amorphous Li3PS4 synthesized in situ with a poly(ethylene oxide) (PEO) binder using a one-pot, solvent-mediated route. The solvent and thermal processing conditions have a dramatic impact on the Li3PS4 structure. Conducting the synthesis in tetrahydrofuran resulted in crystalline β-Li3PS4 whereas acetonitrile led to amorphous Li3PS4. Annealing at 140 °C increased the Li+ conductivity of an amorphous composite (Li3PS4 + 1 wt % PEO) by 3 orders of magnitude (e.g., from 4.5 × 10-9 to 8.4 × 10-6 S/cm at room temperature) because of: (i) removal of coordinated solvent and (ii) rearrangement of the polyanionic network to form P2S74- and PS43- moieties. The PEO content in these composites should be limited to 1-5 wt % to ensure reasonable Li+ conductivity (e.g., up to 1.1 × 10-4 S/cm at 80 °C) while providing enough binder to facilitate scalable processing. The results of this study highlight a new strategy to suppress crystallization in sulfide-based SEs, which has important implications for solid-state batteries.

OriginalspracheEnglisch
Seiten (von - bis)8789-8797
Seitenumfang9
FachzeitschriftChemistry of Materials
Jahrgang32
Ausgabenummer20
DOIs
PublikationsstatusVeröffentlicht - 27 Okt. 2020
Extern publiziertJa

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