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. 2019 Dec 27;9:19947. doi: 10.1038/s41598-019-56244-x

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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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(a) Delithiation (solid) and lithiation (dashed) profiles for the Li₈FeS₅/C electrode at 298 K. The lithiation plateaus at approximately 2.0 V and 1.4 V correspond to the reduction of sulfur and Fe–S components, respectively. Inset: Schematic illustration of the Li₈FeS₅/Li cell. Li, Fe and S atoms are represented as red, blue and green spheres, respectively. (b) Schematic phase diagram of the Li–Fe–S system. The color symbols correspond to those in (a).