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. 2021 Jan 8;12:186. doi: 10.1038/s41467-020-20339-1

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© The Author(s) 2021

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 — a ATR-FTIR spectra of Li with CA-Li, b FTIR spectra of CA and CA-Li, c ¹H NMR of CA–Li and CA. High-resolution XPS analyzation of the d Li 1s, e C 1s, f O 1s, and g N 1s peaks obtained from SEI films of Li@LiNO₃ (top spectrum) and Li@CA-LiNO₃ (bottom spectrum). h The XPS depth profiles of Li@CA-LiNO₃ (The in-depth spectra from top to down were collected after Ar sputtering. All the electrodes were prepared after 10th stripping/plating process).