Tailoring terminal groups in sulfonyl solvents to boost compatibility with lithium metal anodes.

The X-ray photoelectron spectroscopy (XPS) depth profiling indicates that the organic content on the FSI/PF-DMSF-derived SEI shows a decreasing trend as the etching depth increases, while the subsurface region is enriched with LiF and Li 2 S ( Fig. 4a ).

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