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. 2022 Apr 6;14:94. doi: 10.1007/s40820-022-00844-2

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© The Author(s) 2022

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. 7 — a Galvanostatic discharge curve of a high performance MnO₂ cathode with Zn-Al anode, with the high energy density arising from both high charge capacity and b high discharge voltage [80].

Copyright 2020, American Chemical Society. c Schematic of the insertion of the high capacity Al³⁺ ion [81]. Copyright 2019, Elsevier. d As a comparison, schematic of the insertion of heavy AlCl₄⁻ ion, commonly seen in carbon cathodes [82]. Copyright 2015, Springer Nature