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NaFeF: A fluoride-based cathode for high power and long life Na-ion batteries

Energy and Environmental Science, ISSN: 1754-5706, Vol: 14, Issue: 3, Page: 1469-1479
2021
  • 23
    Citations
  • 0
    Usage
  • 56
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    23
    • Citation Indexes
      23
  • Captures
    56

Article Description

Despite the high energy density of layered-type cathode materials for Na-ion batteries, their two-dimensional crystal structure suffers a large volume change and phase transition during Na+ de/intercalation, which often results in their poor cycling performances. Thus, a robust three-dimensional framework with minimal structural change is required for stable electrochemical sodium storage. Here, we introduce an earth-abundant element-based trigonal-type Na-Fe-F compound (Na2Fe2F7) with three-dimensionally interconnected FeF6 octahedra and three-dimensional Na+ diffusion pathways. Through combined studies using first-principles calculations and experiments, we confirm that Na2Fe2F7 delivers excellent power-capability due to large three-dimensional Na+ diffusion pathways as well as ultra-long cycling performance due to negligible structural change during Na+ de/intercalation. These results will guide new insights for material discovery for high performance rechargeable batteries.

Bibliographic Details

Hyunyoung Park; Yongseok Lee; Jungmin Kang; Wonseok Ko; Seung Taek Myung; Jongsoon Kim; Min Kyung Cho; Young Hwa Jung; Tae Yeol Jeon; Jihyun Hong; Hyungsub Kim

Royal Society of Chemistry (RSC)

Environmental Science; Energy

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