Crystallization behaviors in superionic conductor Na3PS4

Hiroshi Nakajima*, Hirofumi Tsukasaki, Jiong Ding, Takuya Kimura, Takumi Nakano, Akira Nasu, Akihiko Hirata, Atsushi Sakuda, Akitoshi Hayashi, Shigeo Mori

*この研究の対応する著者

研究成果: Article査読

抄録

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 nano-sized crystallites and the composite formed by crystallites and amorphous domains are most likely responsible for the increase in conductivity in the cubic Na3PS4 specimens.

本文言語English
論文番号230444
ジャーナルJournal of Power Sources
511
DOI
出版ステータスPublished - 2021 11 1

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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