Multifunctional Effect of Fe Substitution in Na Layered Cathode Materials for Enhanced Storage Stability

Jehee Park, Kyojin Ku, Jihyeon Gim, Seoung Bum Son, Heonjae Jeong, Lei Cheng, Hakim Iddir, Dewen Hou, Hui Xiong, Yuzi Liu, Eungje Lee, Christopher Johnson

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Developing stable cathode materials that are resistant to storage degradation is essential for practical development and industrial processing of Na-ion batteries as many sodium layered oxide materials are susceptible to hygroscopicity and instability upon exposure to ambient air. Among the various layered compounds, Fe-substituted O3-type Na(Ni1/2Mn1/2)1-xFexO2 materials have emerged as a promising option for high-performance and low-cost cathodes. While previous reports have noted the decent air-storage stability of these materials, the role and origin of Fe substitution in improving storage stability remain unclear. In this study, we investigate the air-resistant effect of Fe substitution in O3-Na(Ni1/2Mn1/2)1-xFexO2 cathode materials by performing systematic surface and structural characterizations. We find that the improved storage stability can be attributed to the multifunctional effect of Fe substitution, which forms a surface protective layer containing an Fe-incorporated spinel phase and decreases the thermodynamical driving force for bulk chemical sodium extraction. With these mechanisms, Fe-containing cathodes can suppress the cascades of cathode degradation processes and better retain the electrochemical performance after air storage.

Original languageEnglish
Pages (from-to)38454-38462
Number of pages9
JournalACS Applied Materials and Interfaces
Volume15
Issue number32
DOIs
StatePublished - Aug 16 2023
Externally publishedYes

Keywords

  • air storage
  • Fe substitution
  • iron (Fe) cathode
  • layered cathode
  • sodium-ion batteries

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