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Atomistic Observation of Desodiation-Induced Phase Transition in Sodium Tungsten Bronze.

Qi MengYuanlin ZhuangRenhui JiangShuang MengZhengzhou WangLei LiYing ZhangShuangfeng JiaPeili ZhaoHe ZhengJianbo Wang
Published in: The journal of physical chemistry letters (2021)
The phase instability in layered-structure Na0.5WO3.25 induced by the extraction of Na ions was investigated by applying transmission electron microscopy. Real-time atomic-scale observation reveals the phase transition pathway: Na0.5WO3.25 (triclinic) → NaxWO3 (cubic) → WO3 (monoclinic) with specific orientation relationships. The dynamic evolution of Na0.5WO3.25/NaxWO3 phase boundaries shows that Na0.5WO3.25 will cleave along the (100)T and (010)T and recrystallize as (101)C and (010)C of NaxWO3, respectively. The phase transition pathway can be well-explained according to the structural characteristics in the three phases. By better understanding of the phase instability induced by the extraction of Na ions in possible layered-structure cathode materials, this work provides a reference for the design of sophisticated strategies toward high-performance Na-ion batteries.
Keyphrases
  • ion batteries
  • electron microscopy
  • quantum dots
  • oxidative stress
  • molecular dynamics simulations
  • high resolution
  • high glucose
  • mass spectrometry