Enhancing Structural and Interfacial Stability of NaNi<sub>1/3</sub>Mn<sub>1/3</sub>Fe<sub>1/3</sub>O<sub>2</sub> Cathodes via Sb<sup>3+</sup> Doping for Sodium Ion Batteries.
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ABSTRACT: O3-type NaNi1/3Mn1/3Fe1/3O2 (NFM) cathodes for sodium-ion batteries face critical challenges of sluggish Na+ diffusion and structural degradation during cycling. In this study, we implement an Sb3+ doping strategy that enhances structural stability and interfacial stability by modulating the NFM grain morphology to promote densification of primary particles and shorten Na+ 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-1 at 5 C. These improvements are attributed to the alleviation of stress concentration and suppression of microcrack for
SUBMITTER: Liu Y
PROVIDER: S-EPMC12566254 | biostudies-literature | 2025 Oct
REPOSITORIES: biostudies-literature
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