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. 2019 Jan 14;10:188. doi: 10.1038/s41467-018-07975-4

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© The Author(s) 2019

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. 2 — Morphological evolutions of lithium sulfide at different states of discharge. a The first discharge curves at 0.05 C. Discharge of the individual cells stopped at the marked states of discharge (SOD) for Scanning electron microscopy (SEM) analysis. d A SEM image of the pristine carbon paper (CP) electrode, SEM images of the CP electrodes at different SODs with the b, c lithium bistriflimide (LiTFSI), e–g lithium triflate (LiTf), and h–j lithium bromide (LiBr) electrolytes. Scale bars, 5 μm (b, d, e, h); 10 μm (c, f, g, i, j). The Nyquist plots of the impedances measured at the points are provided in the insets. (The range of the x and y-axes is from −100 to 1400 Ω cm²; enlarged figures are given in Supplementary Fig. 6.)