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• W2801225070 abstract "P2-type layered oxides based on the elements Fe and Mn have attracted great interest as sodium ion battery (SIB) cathode materials owing to their inexpensive metal constituents and high specific capacity. However, they suffer from rapid capacity fading and complicated phase transformations. In this study, we modulate the crystal structure and optimize the electrochemical performances of Na0.67Mn0.5Fe0.5O2 by Al doping for Mn or Fe, respectively, and the roles of Al in the enhancement of the rate capability and cycling performance are unraveled. (1) The substitution of Al for Mn or Fe decreases the lattice parameters a and c but enlarges d spacing and lengthens Na-O bonds, which enhances Na+ diffusion and rate capability especially for Na0.67Mn0.5Fe0.47Al0.03O2. (2) Al doping reduces the thickness of TMO2 and strengthens TM-O/O-O bonding. This enhances the layered structure stability and the capacity retention. (3) Al doping mitigates Mn3+ and Jahn-Teller distortion, mitigating the irreversible phase transition. (4) Al doping also alleviates the lattice volume variation and the structure strain. This further improves the stability of the layered structure and the cycling performances particularly in the case of Al doping for Fe. The in-depth insights into the roles of Al substitution might be also useful for designing high-performance cathode materials for SIBs through appropriate lattice doping." @default.
• W2801225070 created "2018-05-17" @default.
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• W2801225070 date "2018-04-24" @default.
• W2801225070 modified "2023-10-10" @default.
• W2801225070 title "Different Effects of Al Substitution for Mn or Fe on the Structure and Electrochemical Properties of Na_0.67Mn_0.5Fe_0.5O₂ as a Sodium Ion Battery Cathode Material" @default.
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• W2801225070 doi "https://doi.org/10.1021/acs.inorgchem.8b00284" @default.
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• W2801225070 hasPublicationYear "2018" @default.
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