Crystallization behaviors in superionic conductor Na3PS4

JOURNAL OF POWER SOURCES

卷:511

Article

Nakajima, Hiroshi¹  Tsukasaki, Hirofumi¹  Ding, Jiong¹  Kimura, Takuya²  Nakano, Takumi²  Nasu, Akira²  Hirata, Akihiko^3,4  Sakuda, Atsushi²  Hayashi, Akitoshi²  Mori, Shigeo¹ 

[1] Osaka Prefecture Univ, Dept Mat Sci, Sakai, Osaka 5998531, Japan

[2] Osaka Prefecture Univ, Dept Appl Chem, Sakai, Osaka 5998531, Japan

[3] Waseda Univ, Dept Mat Sci, Shinjuku Ku, Tokyo 1698555, Japan

[4] Waseda Univ, Kagami Mem Res Inst Mat Sci & Technol, Shinjuku Ku, Tokyo 1690051, Japan

关键词: All-solid-state battery;    Sodium electrolyte;    Na3PS4;    Crystallization behavior;    Microstructures;    Transmission electron microscopy;   

DOI  :  10.1016/j.jpowsour.2021.230444

来源: Elsevier

【 摘 要 】

All-solid-state batteries using sodium are promising candidates for next-generation rechargeable batteries due to the limited lithium resources. A practical sodium battery requires an electrolyte with high conductivity. Cubic Na3PS4 exhibiting high conductivity of over 10-4 S cm- 1 is obtained by crystallizing amorphous Na3PS4 synthesized by ball milling. Amorphous Na3PS4 crystallizes in a cubic structure and then is transformed into a tetragonal phase upon heating. In this study, in situ observation by transmission electron microscopy demonstrates that the crystallite size drastically increases during the transition from the cubic phase to the tetragonal phase. Moreover, an electron diffraction analysis reveals that amorphous domains and nano-sized crystallites coexist in the cubic Na3PS4 specimen, while the tetragonal phase contains micro-sized crystallites. The nanosized crystallites and the composite formed by crystallites and amorphous domains are most likely responsible for the increase in conductivity in the cubic Na3PS4 specimens.

【 授权许可】

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