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Understanding on the structural and electrochemical performance of orthorhombic sodium manganese oxides

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Abstract

We investigate the orthorhombic Na0.67[NixMn1−x]O2 (x = 0 and 0.05) cathode materials that provide high capacity for prolonged cycles. X-ray absorption studies revealed that the redox activity of the Mn3+/4+ and Ni2+/3+ pairs is effective in suppressing the Jahn–Teller effect of Mn3+ ions because of the network with Ni2+ ions. This effect influenced the smooth voltage variations in the voltage profile for Na0.67[Ni0.05Mn0.95]O2, whereas several complicated voltage plateaus associated with the first-order phase transition were noticed in Na0.67MnO2. Operando synchrotron X-ray diffraction and transmission microscopy studies confirmed the simplicity of the phase transition for Na0.67[Ni0.05Mn0.95]O2 due to suppression of the Jahn–Teller effect of Mn3+ in the oxide lattice. These findings, along with the capacity retention during prolonged cycling and the acceptable thermal properties, make high-capacity sodium-ion batteries feasible, inexpensive, and safe for energy storage application.

Graphical abstract: Understanding on the structural and electrochemical performance of orthorhombic sodium manganese oxides

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Publication details

The article was received on 10 Sep 2018, accepted on 19 Nov 2018 and first published on 22 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA08796B
Citation: J. Mater. Chem. A, 2019, Advance Article
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    Understanding on the structural and electrochemical performance of orthorhombic sodium manganese oxides

    J. U. Choi, C. S. Yoon, Q. Zhang, P. Kaghazchi, Y. H. Jung, K. Lee, D. Ahn, Y. Sun and S. Myung, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA08796B

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