Deciphering the Impact of Graphene Oxide Incorporation on Structural, Chemical, and Electrochemical Properties of Na<sub>2</sub>Fe(SO<sub>4</sub>)<sub>2</sub> Cathode Materials
The performance of polyanionic Na<sub>2</sub>Fe(SO<sub>4</sub>)<sub>2</sub> (NFS) cathode materials is hindered by their low electronic conductivity and is correlated to their structural and chemical instability. Herein, we incorporated graphene oxide (GO) to modify NFS materials, which can build a carbon layer on the surface and alleviate Na<sub>6</sub>Fe(SO<sub>4</sub>)<sub>4</sub> phase formation and Fe<sup>2+</sup> oxidation in the lattice. Meanwhile, the performance of NFS materials has been significantly improved, such as the capacity retention showing an increase from 56% to 87% after 200 cycles at 0.5 C with GO incorporation. Soft X-ray absorption spectra (sXAS) reveals that the bulk has higher reversibility of the reaction between Fe<sup>2+</sup> and Fe<sup>3+</sup> than the surface during cycling, which indicates the origin of cycling instability of NFS materials. These findings provide new insights into surface modification for the development of high performance NFS cathodes.
Authors
- Zhiwei Hu (ORCID: https://orcid.org/0000-0003-0324-2227)
- Chang‐Yang Kuo (ORCID: https://orcid.org/0000-0003-1968-8020)
- Yanan Jiang (ORCID: https://orcid.org/0000-0002-4335-1383)
- Hua‐Bin Sun (ORCID: https://orcid.org/0000-0001-7854-4620)
- Xuelin Yang (ORCID: https://orcid.org/0000-0001-5626-701X)
- Yuwei Chen (ORCID: https://orcid.org/0000-0003-0148-3609)
- Lulu Zhang (ORCID: https://orcid.org/0000-0002-6824-6459)
- Hongjie Dai (ORCID: https://orcid.org/0000-0002-5541-0301)
- Xiaokai Ding (ORCID: https://orcid.org/0000-0003-1483-3866)
- Chien‐Te Chen
Institutions
- Tongji University (CN)
- National Yang Ming Chiao Tung University (TW)
- China Three Gorges University (CN)
- National Synchrotron Radiation Research Center (TW)
- Max Planck Institute for Chemical Physics of Solids (DE)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-04-16
- DOI
- https://doi.org/10.1021/acs.nanolett.4c06048
- Citations
- 8
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 5.84
Funders
- National Natural Science Foundation of China
- Pohang University of Science and Technology
- Natural Science Foundation of Hubei Province
- Max-Planck-Gesellschaft
- Major Technology Innovation of Hubei Province
- National Major Science and Technology Projects of China