Enhancing Structural and Interfacial Stability of NaNi1/3Mn1/3Fe1/3O2 Cathodes via Sb3+ Doping for Sodium Ion Batteries
O3-type NaNi<sub>1/3</sub>Mn<sub>1/3</sub>Fe<sub>1/3</sub>O<sub>2</sub> (NFM) cathodes for sodium-ion batteries face critical challenges of sluggish Na<sup>+</sup> diffusion and structural degradation during cycling. In this study, we implement an Sb<sup>3+</sup> doping strategy that enhances structural stability and interfacial stability by modulating the NFM grain morphology to promote densification of primary particles and shorten Na<sup>+</sup> migration paths. The optimized Sb-doped NFM1Sb (1%mol Sb) cathode exhibits excellent electrochemical performance, achieving 86.48% capacity retention after 200 cycles at 1 C and a high rate capability of 122.2 mAh g<sup>-1</sup> at 5 C. These improvements are attributed to the alleviation of stress concentration and suppression of microcrack formation during cycling. This work demonstrates the critical role of grain morphology regulation through heavy-metal doping in developing long-life and high-rate SIBs, providing a viable pathway toward next-generation energy storage systems.
Authors
- Yougen Tang (ORCID: https://orcid.org/0000-0002-7150-7947)
- Shi You (ORCID: https://orcid.org/0000-0003-3371-9647)
- Huanhuan Li (ORCID: https://orcid.org/0000-0001-7954-100X)
- Yong Liu (ORCID: https://orcid.org/0000-0002-2137-1404)
- Dan Sun (ORCID: https://orcid.org/0000-0003-4513-7046)
- Haiyan Wang (ORCID: https://orcid.org/0000-0002-2242-6534)
- Mengjie Zhang (ORCID: https://orcid.org/0009-0009-1501-1742)
Institutions
- Central South University (CN)
- Shenwu Technology Group Corp (China) (CN)
- Henan Normal University (CN)
Publication Details
- Journal
- Nanomaterials
- Published
- 2025-10-16
- DOI
- https://doi.org/10.3390/nano15201575
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00