논문 해외 국제전문학술지(SCI급) Multifunctional Effect of Fe Substitution in Na Layered Cathode Materials for Enhanced Storage Stability
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2023-08
- 저자명 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
- 학술지명 ACS Applied Materials & Interfaces
- 발행처명 American Chemical Society
- 발행국가 해외
- 논문언어 외국어
- 원문 링크 https://pubs.acs.org/doi/full/10.1021/acsami.3c07068
홈페이지논문 초록 (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.