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. 2017 Feb 13;8:14283. doi: 10.1038/ncomms14283

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Schematic illustration of preparation process of a free-standing natural graphite (NG) film (steps A–D) bonded to a conducting carbon tape current collector (step E). (b) The top (scale bars, 10 μm) and (c) cross-sectional SEM images of GFF electrode. (scale bars, 100 μm) The thickness of NG film is ∼50 μm. The loading amount of NG is 4 mg cm⁻², only calculating the weight of graphite without binder.