arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.11097cond-mat.mtrl-sci
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快离子导体Na $_3$ PS $_4$的晶化行为

Crystallization behaviors in superionic conductor Na$_3$PS$_4$

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

摘要:

由于锂资源有限,使用钠的全固态电池是下一代可充电电池的有希望的候选者。实用的钠电池需要具有高导电性的电解质。通过使通过球磨合成的无定形Na $_3$ PS $_4$结晶,获得表现出超过10 $^{-4}$ S cm $^{-1}$的高电导率的立方Na $_3$ PS $_4$。无定形Na $_3$ PS $_4$以立方结构结晶,然后在加热时转化为四元相。在这项研究中,通过透射电子显微镜原位观察表明,在从立方相到四方相的过渡过程中,微晶尺寸急剧增加。此外,电子衍射分析表明,无定形域和纳米尺寸的微晶共存的立方Na $_3$ PS $_4$标本,而四相含有微米尺寸的微晶。纳米尺寸的微晶和由微晶和无定形域形成的复合物是最有可能负责的立方Na $_3$ PS $_4$标本中的电导率的增加。

英文摘要:

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 Na$_3$PS$_4$ exhibiting high conductivity of over 10$^{-4}$ S cm$^{-1}$ is obtained by crystallizing amorphous Na$_3$PS$_4$ synthesized by ball milling. Amorphous Na$_3$PS$_4$ 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 Na$_3$PS$_4$ 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 Na$_3$PS$_4$ specimens.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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