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Chemical stability of Li4PS4I solid electrolyte against hydrolysis

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Title: Chemical stability of Li4PS4I solid electrolyte against hydrolysis
Authors: Calpa, Marcela Browse this author
Rosero-Navarro, Nataly Carolina Browse this author
Miura, Akira Browse this author →KAKEN DB
Jalem, Randy Browse this author
Tateyama, Yoshitaka Browse this author
Tadanaga, Kiyoharu Browse this author →KAKEN DB
Keywords: Solid electrolyte
Sulfide electrolyte
Chemical stability
Lithium battery
All-solid-state battery
Issue Date: Mar-2021
Publisher: Elsevier
Journal Title: Applied materials today
Volume: 22
Start Page: 100918
Publisher DOI: 10.1016/j.apmt.2020.100918
Abstract: Sulfide solid electrolytes in the Li3PS4-LiI system are promising for all-solid-state batteries owing to their high ionic conductivity in the order of 10(-4) S cm(-1) and electrochemical stability. Nonetheless, the low chemical stability tendency of sulfide-based materials under ambient atmosphere is a critical issue due to the generation of toxic H2S gas. In this study, the chemical stability of Li4PS4I (Li3PS4-LiI) solid electrolyte under ambient atmosphere was investigated and compared with that of Li3PS4 to analyze the effect of the incorporation of LiI on the chemical stability of sulfide-based electrolytes. No generation of H2S gas was detected in the Li4PS4I solid electrolyte after an exposure of 60 min to the ambient atmosphere with high relative humidity of 40%. The hydrolysis suppression is attributed to the formation of LiI center dot H2O, acting as a protective barrier between PS43- units in the electrolyte and H2O molecules in air. The structural reversibility of Li4PS4I by simple drying at 180 degrees C was confirmed and the solid electrolyte exhibited an ionic conductivity of 10(-4) S cm(-1) at room temperature, similar to that of the sample before the exposure to the ambient atmosphere.
Rights: ©2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Nataly Carolina Rosero Navarro

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