Multifunctional Effect of Fe Substitution in Na Layered Cathode Materials for Enhanced Storage Stability
- 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
- Issue Date
- Aug-2023
- Publisher
- AMER CHEMICAL SOC
- Keywords
- iron (Fe) cathode; Fe substitution; air storage; layered cathode; sodium-ion batteries
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.15, no.32, pp 38454 - 38462
- Pages
- 9
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 15
- Number
- 32
- Start Page
- 38454
- End Page
- 38462
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91539
- DOI
- 10.1021/acsami.3c07068
- ISSN
- 1944-8244
1944-8252
- Abstract
- Developing stable cathode materials that are resistantto storagedegradation is essential for practical development and industrialprocessing of Na-ion batteries as many sodium layered oxide materialsare susceptible to hygroscopicity and instability upon exposure toambient air. Among the various layered compounds, Fe-substituted O3-typeNa(Ni1/2Mn1/2)(1-x )Fe x O2 materials haveemerged as a promising option for high-performance and low-cost cathodes.While previous reports have noted the decent air-storage stabilityof these materials, the role and origin of Fe substitution in improvingstorage stability remain unclear. In this study, we investigate theair-resistant effect of Fe substitution in O3-Na(Ni1/2Mn1/2)(1-x )Fe x O2 cathode materials by performing systematic surfaceand structural characterizations. We find that the improved storagestability can be attributed to the multifunctional effect of Fe substitution,which forms a surface protective layer containing an Fe-incorporatedspinel phase and decreases the thermodynamical driving force for bulkchemical sodium extraction. With these mechanisms, Fe-containingcathodes can suppress the cascades of cathode degradation processesand better retain the electrochemical performance after air storage.
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