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. 2019 Aug 29;116(38):18815–18821. doi: 10.1073/pnas.1907507116

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Fig. 2. — (A) High-resolution ⁶Li MAS NMR spectra of PEO/LiTFSI and PEO/LSTZ samples. (B) ⁶Li →⁷Li tracer-exchange NMR of PEO/LSTZ before (red) and after (blue) cycling against ⁶Li metal: ⁶Li NMR spectra is above the ⁷Li. (C) High-resolution Ta 4d XPS spectra of LSTZ and PEO/LSTZ composite; the peak at 233.6 eV is assigned to S 2s from the LiTFSI in PEO/LSTZ. The top (D) and side views (E) of the perovskite (001) atomic structure. (F) The crystallographic structure of LiTFSI adsorbed on the O-terminated (001) surface of the perovskite with 1 O vacancy.