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In Situ TEM Study of Structural Changes in Na-β″-Alumina Using Electron Beam Irradiation.

Sung-Dae KimYoung-Woon Kim
Published in: Materials (Basel, Switzerland) (2022)
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.
Keyphrases
  • electron microscopy
  • mass spectrometry
  • high resolution
  • water soluble
  • high speed