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| Autores principales: | , , , , |
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| Formato: | Artículo Open Access |
| Publicado: |
Wiley
2025
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| Materias: | |
| Acceso en línea: | https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cssc.202500567 |
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- Rational Design and Electrochemical Mechanism of High‐Capacity Quadruple Layered Oxide Cathode Materials for Rechargeable Sodium‐Ion Batteries Yangyang Zhang Meijing Wang Yu Bai Wenhua Fu Xingde Xiang ChemSusChem O3‐type layered oxides are strongly considered as a promising cathode material for rechargeable sodium‐ion batteries due to the high theoretical capacity and low‐cost raw materials, but are challenged by poor electrochemical performance over Na extraction above 4.0 V. Herein, a novel quadruple layered oxide is rationally designed by regulating Fe doping in the representative NaNi0.5Ti0.25Mn0.25O2 composition, and influence of Fe doping on structure and electrochemistry of the NaNi0.5‐x/2Ti0.25‐x/2FexMn0.25O2 (0 ≤ x ≤ 0.30) material is systematically investigated with X‐ray diffraction (XRD), transmission electron microscope, cyclic voltammetry, and galvanostatic measurement. It is found that the favorable quadruple structure enables the optimized NaNi0.45Ti0.2Fe0.1Mn0.25O2 material to show superior electrochemical performance with a large practical capacity of 157 mAh g−1 at 10 mA g−1 and a high‐capacity retention of 81% after 100 cycles at 100 mA g−1. Furthermore, the phase transitions and redox reactions are analyzed by using ex situ XRD and X‐ray photoelectron spectroscopy. In addition, the cycling degradation of the materials during cycling is understood with dQ/dV curves and XRD technique. The results in this study indicate the effectiveness of the dual‐cationic substitution strategy in designing high‐performance layered oxides cathode, and suggest significant impact of cationic migration on their capacity degradation and voltage hysteresis during cycling. 10.1002/cssc.202500567 http://onlinelibrary.wiley.com/termsAndConditions#vor