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. 2023 Feb 7;13:2169. doi: 10.1038/s41598-023-28951-z

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© The Author(s) 2023

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 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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PCA components extracted from the series of operando XANES spectra for the Fe compared to the experimental spectra for LiFePO₄ and FePO₄ (ref.⁴⁰) (a) and Co (b) K-edge in the LiCo_0.5Fe_0.5PO₄ cathode material, compared to the experimental spectra of the reference compounds (LiCoPO₄@UiO-66)⁷. (c) Cell voltage of Fe during the first cycle dots on a black voltage profile mark the start time for measuring each successive XAS spectrum. (d) PCA phase concentration of the Fe²⁺ and Fe³⁺ components compared to the cell potential. (e) Cell Voltage of Co during the first cycle dots on a black voltage profile marks the start time for measuring each successive XAS spectrum. (f) PCA phase concentration of the Co²⁺ and Co³⁺ components compared to the cell potential.