Regulation Mechanism of Al Doping on Sodium-storage Performance of Mn-rich P2-type Na0.67Fe0.30Mn0.70O2

doi:10.15541/jim20260223

Abstract

Abstract: Owing to abundant sodium resources and low cost, sodium-ion batteries show promising prospects for large-scale energy storage. Developing Li/Co/Ni-free layered oxide cathode materials with low cost and high capacity is an important direction for promoting the industrialization of sodium-ion batteries. In this study, Mn-rich P2-type layered Na_0.67Fe_0.30Mn_0.70O₂ was selected as the parent material, and Na_0.67Fe_0.30-_xMn_0.70Al_xO₂ cathode materials with different Al doping contents were prepared by a Sol-Gel method. The effects of Al doping on crystal structure, microstructure, and electrochemical sodium-storage performance were systematically investigated. Appropriate Al doping does not change the P2-type layered structure, but slightly contracts the unit-cell volume, Na-layer spacing, and transition-metal-oxygen slab thickness, while reducing the particle size. Among them, Na_0.67Fe_0.26Mn_0.70Al_0.04O₂ exhibits better overall electrochemical performance, delivering an initial discharge capacity of 187.6 mAh·g^-1. After rate testing, its reversible capacity recovers to 160.9 mAh·g^-1 when the current density returns to 20 mA·g^-1, which is much higher than that of Na_0.67Fe_0.30Mn_0.70O₂ (120.0 mAh·g^-1). Appropriate Al doping reduces charge-transfer resistance, promotes Na⁺ diffusion, and alleviates irreversible structural evolution during charge-discharge processes. These results demonstrate that Al doping is an effective strategy for improving the sodium-storage performance of Mn-rich P2-type Fe-Mn-based layered oxide cathodes, providing a reference for the design of low-cost and high-capacity cathode materials for sodium-ion batteries.

Key words: sodium-ion battery, P2-type layered oxide, Mn-rich cathode, Al doping, electrochemical performance

TAN Zhihan, LI Tangyi, CHEN Weihao, LU Tao, LONG Zhen, QIU Guohong. Regulation Mechanism of Al Doping on Sodium-storage Performance of Mn-rich P2-type Na_0.67Fe_0.30Mn_0.70O₂[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260223.

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Regulation Mechanism of Al Doping on Sodium-storage Performance of Mn-rich P2-type Na_0.67Fe_0.30Mn_0.70O₂

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