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

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...

Full description

Saved in:
Bibliographic Details
Published in:ACS applied materials & interfaces 2023-08, Vol.15 (32), p.38454-38462
Main Authors: Park, Jehee, Ku, Kyojin, Gim, Jihyeon, Son, Seoung-bum, Jeong, Heonjae, Cheng, Lei, Iddir, Hakim, Hou, Dewen, Xiong, Hui, Liu, Yuzi, Lee, Eungje, Johnson, Christopher
Format: Article
Language:English
Subjects:
air storage
ENERGY STORAGE
Energy, Environmental, and Catalysis Applications
Fe substitution
iron (Fe) cathode
layered cathode
sodium-ion batteries
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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–x Fe x O2 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–x Fe x O2 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.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.3c07068