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. 2020 Sep 11;11:4548. doi: 10.1038/s41467-020-18345-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a XRD pattern of Na_2/3Fe_1/2Mn_1/2O₂. The inset shows the crystal structure and SEM image of the material. The scale bar in the SEM image corresponds to a length of 500 nm. b XRD pattern of LiNiO₂. The inset shows the crystal structure and SEM image of the material. The scale bar in the SEM image corresponds to a length of 500 nm. c Charge and discharge curves of Na half cell containing the Na_2/3Fe_1/2Mn_1/2O₂ as the cathode material at a rate of C/10. d Charge and discharge curves of Na half cell containing the Na_2/3Fe_1/2Mn_1/2O₂ as the cathode material at a rate of 1C. e Charge and discharge curves of Li half cell containing the LiNiO₂ as the cathode material at a rate of C/5. f Charge and discharge curves of Li half cell containing the LiNiO₂ as the cathode material at a rate of 1C. The first cycle is at C/5 rate. The charge and discharge curves for both materials are plotted for up to 20 cycles.