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Updated: May 7, 2026
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Enhancing Structural and Interfacial Stability of NaNi1/3Mn1/3Fe1/3O2 Cathodes via Sb3+ Doping for Sodium Ion
Yong Liu1,2, You Shi1, Mengjie Zhang1
1Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
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 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.
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