Issue 14, 2021

Suppressing multiphase transitions of an O3-NaNi0.5Mn0.5O2 cathode by iron and magnesium co-doping towards sodium-ion batteries

Abstract

Sodium-rich O3-type sodium-layered oxides have been well recognized as one of the most promising cathode materials for sodium-ion batteries (SIBs) owing to their high capacity and ease of synthesis; however, they suffer from the decay in electrochemical performances due to the complicated phase transformations. Herein, we demonstrate the preparation of an Fe/Mg co-doped O3-NaNi0.35Fe0.2Mg0.05Mn0.4O2 (O3-NFMM) cathode material for SIBs via a solid-state reaction method. Based on Ni2+/Ni3+ and Fe3+/Fe4+ redox couples, the O3-NFMM cathode delivers a high reversible capacity of 129.4 mA h g−1 at 0.1 C, a capacity retention of 86% after 150 cycles at 1 C, and a good rate capability (57% of the initial capacity at 8 C) compared with those of the pristine O3-NaNi0.5Mn0.5O2 and two mono-doped counterparts. In situ XRD characterizations demonstrate that the O3hex-O3′mon-P3hex-P3′mon-P3′′hex complex phase transition of the O3-NaNi0.5Mn0.5O2 material is suppressed, and the highly reversible O3-P3 phase transition is achieved by Fe/Mg co-doping, thus facilitating the fast Na+ migration of O3-NFMM. Furthermore, the sodium-ion full battery paired with a hard-carbon anode exhibits a high reversible capacity of 132.7 mA h g−1 at 0.1 C and a cycling stability of 80% after 200 cycles at 1 C. These results show that the Fe/Mg co-doping strategy can provide a facile avenue for designing high-performance O3-type layered cathode materials for sodium-ion batteries.

Graphical abstract: Suppressing multiphase transitions of an O3-NaNi0.5Mn0.5O2 cathode by iron and magnesium co-doping towards sodium-ion batteries

Supplementary files

Article information

Article type
Research Article
Submitted
15 jan 2021
Accepted
28 apr 2021
First published
28 apr 2021

Mater. Chem. Front., 2021,5, 5344-5350

Suppressing multiphase transitions of an O3-NaNi0.5Mn0.5O2 cathode by iron and magnesium co-doping towards sodium-ion batteries

X. Zhang, Y. Zhou, L. Yu, S. Zhang, X. Xing, W. Wang and S. Xu, Mater. Chem. Front., 2021, 5, 5344 DOI: 10.1039/D1QM00079A

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