Characterizing the Structural Change of Na3PS4 Solid Electrolytes in a Humid N2 Atmosphere
Characterizing the Structural Change of Na3PS4 Solid Electrolytes in a Humid N2 Atmosphere
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表征潮湿 N2 气氛中 Na3PS4 固体电解质的结构变化
DOI：
10.1021/acs.jpcc.2c00421
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Hayashi Akitoshi
中科院分区：
文献类型：
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作者：
Nakano Takumi;Kimura Takuya;Sakuda Atsushi;Tatsumisago Masahiro;Hayashi Akitoshi
硫化物固体电解质（SSE）显示出比氧化物固体电解质更高的离子电导率。然而，SSE通常表现出对水分敏感的性质。本研究以Na 3 PS4（Na 2SO 4）为降解剂，探讨了SSEs在潮湿N2气氛中的降解机理。使用包括X射线衍射仪、湿度调节器和H2S传感器的系统监测暴露于加湿N2期间的结构变化。结构评估揭示，暴露的水是水合物，并且通过使用再生处理（例如在200 °C下加热或在减压下加热/不加热干燥）除去吸附/水合水分子，将其回收到水结晶相。在25 °C下，再生后的样品的离子电导率为5.3 × 10-5S cm-1，是未再生样品的40倍。这些结果表明，暴露的钙钛矿可以在结构上和导电再生到钙钛矿晶体相使用再生处理。
Sulfide solid electrolytes (SSEs) show a higher ionic conductivity than oxide solid electrolytes. However, SSEs generally exhibit a moisture-sensitive nature. This study focused on the degradation mechanisms of SSEs in a humid N2atmosphere, and Na3PS4(NPS) was selected as the SSE. The structural changes during exposure to humidified N2were monitored using a system comprising an X-ray diffractometer, a humidity regulator, and an H2S sensor. Structural evaluations revealed that the exposed NPS was a hydrate, and it was recovered to the NPS crystal phase by the removal of adsorbed/hydrated water molecules using regenerating treatments, such as heating at 200 °C or drying under reduced pressure with/without heating. The regenerated NPS showed an ionic conductivity of 5.3 × 10–5S cm–1at 25 °C, which is 40 times that of the exposed NPS. These results suggest that exposed NPS can be structurally and conductively regenerated to the NPS crystal phase using regeneration treatments.