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. 2021 May 2;13:118. doi: 10.1007/s40820-021-00643-1

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© The Author(s) 2021

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 performance of MNC and GCNT@ST-MNC half cells. a CV curves of GCNT@ST-MNC from 1st and 4th cycle at 0.1 mV s⁻¹. b Galvanostatic charge/discharge curves at 0.1 C. c Rate performance at various rates from 0.1 to 10 C (the inset is EIS measurement). d Cycling performance at 0.1 C (Coulombic efficiency of GCNT@ST-MNC). e EIS of GCNT@ST-MNC before cycle and after 1000 cycles with experimental and fitting data. f Equivalent circuits for EIS fitting of GCNT@ST-MNC before cycle and after 1000 cycles