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. 2020 Oct 27;13:1. doi: 10.1007/s40820-020-00525-y

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Electrochemical potassium-ion storage performance of NCSs. (a) Profiles of the second, fifth, tenth, 20th, 50th, and 100th potassiation and depotassiation cycles of the NCS-5 anode at 50 mA g⁻¹. (b) Potassiation and depotassiation capacity and Coulombic efficiency of the NCS-5 anode at 200 mA g⁻¹. (c) Rate capability of the NCSs anodes at current densities from 25 to 4000 mA g⁻¹. (d) Cycle life of the NCSs anodes measured at 100 mA g⁻¹. (e) Long-term cycling stability and Coulombic efficiency of the NCS-5 anode at 1000 mA g⁻¹