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. 2020 Jan 29;6(2):232–240. doi: 10.1021/acscentsci.9b01166

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Copyright © 2020 American Chemical Society

This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

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(a) XRD and Rietveld plots of the Na_2/3Fe_2/9Ni_2/9Mn_5/9O₂ sample. The inset shows the P2 type structure with “ABBAAB” arrangement. (b) HRTEM image of the Na_2/3Fe_2/9Ni_2/9Mn_5/9O₂ sample. The inset image is the corresponding SAED pattern. (c) In situ DEMS analysis of oxygen evolution during the first charge for Na_2/3Fe_2/9Ni_2/9Mn_5/9O₂ electrode. The current density is 10 μA mg^–1, and the cut off voltage is 4.3 V. (d) Galvanostatic charge/discharge curves of the Na_2/3Fe_2/9Ni_2/9Mn_5/9O₂ electrode and the irreversible capacity loss for the first cycle at 0.1 C. (e) HRTEM image at the pristine state. (f) HRTEM image after 1 cycle. (g) The P2 crystal structure for the surface layer.