Journal Article

FZJ-2022-01334

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tuning the moisture stability of multiphase β‐Li 3 PS 4 solid electrolyte materials

Lu, X.FZJ* ; Camara, O.FZJ* ; Liu, Z.FZJ* ; Windmüller, A.FZJ* ; Tsai, C.-L.FZJ* ; Tempel, H.FZJ* ; Yu, S. (Corresponding author)FZJ* ; Kungl, H.FZJ* ; Eichel, R.-A.RWTH*

2022
Wiley-VCH Verlag GmbH & Co KGaA Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/34399  doi:10.1002/elsa.202100208

Abstract: Efficiently improving the moisture stability of β-Li3PS4 materials could significantly reduce production costs and eventually enable the mass application. Nanoporous multiphase β-Li3PS4 materials prepared via solvent-assistant routes usually contain solvent or solvent decomposition segments associated with the amorphous Li3PS4 phase in their structures. Herein, the solvent ethyl propionate (EP) remains in the β-Li3PS4 even after 220 h of annealing at 220°C. The possibility of tuning the moisture stability of β-Li3PS4 by adjusting the content of the solvent is investigated by environmental scanning electron microscopy (ESEM) combined with other structural analysis techniques. The results demonstrated that the hydrogen-containing amorphous Li3PS4 not only stabilizes the β-phase at room temperature but also improves the moisture stability of the material. Although the rapid hydrolysis occurs on the surface of solvent-containing β-Li3PS4 materials under ambient conditions within 10 s, with 4 wt% EP content, the material can be exposed to 1.6% relative humidity (R.H.) for at least 8 h without any structural or microstructural change. Even with the lower amount of EP (1.2 wt%) in the Li3PS4 structure, the material can withstand 1% R.H. for more than 8 h, which allows the material to be manufactured in a dry room. Our observation proposes a simple method to slightly modify the moisture stability of β-Li3PS4 to match the different manufacturing conditions.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 1223 - Batteries in Application (POF4-122) (POF4-122)

Appears in the scientific report 2022

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