Kim Sung-Dae, Kim Young-Woon
Advanced Metals Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon 51508, Korea.
Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
Materials (Basel). 2022 Apr 5;15(7):2663. doi: 10.3390/ma15072663.
Real-time structural changes in Na-β″-alumina were observed in situ using transmission electron microscopy (TEM) with electron beam irradiation. Na-β″-alumina has been widely investigated as a solid electrolyte material for sodium-sulfur secondary batteries owing to its high ionic conductivity. This high conductivity is known to be due to the Na ions on the loosely packed conduction planes of Na-β″-alumina. In the present study, we acquired real-time videos of the generation of spinel blocks caused by the conduction of Na ions. In addition, by observing Na extraction during electron beam irradiation, we experimentally confirmed that spinel block generation originates from the Na ion conduction, which has been a subject of recent debate.
利用透射电子显微镜（TEM）和电子束辐照原位观察了钠-β″-氧化铝的实时结构变化。钠-β″-氧化铝因其高离子电导率而被广泛研究作为钠硫二次电池的固体电解质材料。已知这种高电导率是由于钠-β″-氧化铝疏松堆积的导电平面上的钠离子所致。在本研究中，我们获取了由钠离子传导引起的尖晶石块生成的实时视频。此外，通过观察电子束辐照过程中的钠提取，我们通过实验证实了尖晶石块的生成源于钠离子传导，这是近期争论的一个主题。
