Crystallization behaviors in superionic conductor Na3PS4
Crystallization behaviors in superionic conductor Na3PS4
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DOI：
10.1016/j.jpowsour.2021.230444
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发表时间：
2021-08
影响因子：
9.2
通讯作者：
H. Nakajima;H. Tsukasaki;Jiong Ding;T. Kimura;T. Nakano;Akira Nasu;A. Hirata;A. Sakuda;A. Hayashi;S. Mori
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文献类型：
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作者：
H. Nakajima;H. Tsukasaki;Jiong Ding;T. Kimura;T. Nakano;Akira Nasu;A. Hirata;A. Sakuda;A. Hayashi;S. Mori
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。通过对球磨合成的无定形Na 3 PS 4进行晶化，得到了具有10 - 4S cm-1以上高电导率的立方相Na 3 PS 4。无定形Na 3 PS4以立方结构结晶，然后在加热时转变为四元相。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 PS4试样，而四方相包含微米尺寸的微晶。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立方Na 3 PS4试样的电导率的增加。
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 Na3PS4exhibiting high conductivity of over 10−4S cm−1is obtained by crystallizing amorphous Na3PS4synthesized by ball milling. Amorphous Na3PS4crystallizes 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 Na3PS4specimen, 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 Na3PS4specimens.