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. 2023 Mar 9;14:1296. doi: 10.1038/s41467-023-36934-x

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Fig. 2 — a Schematic illustration of the elimination of the native film with photographic images of the Li metal foils after individual reaction steps: in its pristine state (left), after treatment with BBr₃ (middle), after washing with the electrolyte of choice (right). b SEM images of Li metal foils after the corresponding reaction steps (the insets are the magnifications). c Li 1 s XPS plot of the pristine Li metal foil. d Br 3d XPS plot of the BBr₃-treated Li metal foil. e Li 1 s XPS plot of the naked Li metal foil.