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(left) Normalized 19F MAS NMR spectra of silicon electrodes, at the end of 1st, 10th, and 100th lithiation in Li-ion configuration. The integrated intensity (arbitrary unit) values for LiF are given above the corresponding resonance at −204 ppm. (right) Normalized 7Li MAS NMR spectra obtained at the end of 1st, 10th, and 100th delithiation. NMR data have been normalized with respect to the mass of sample and number of scans and the spectra are given in absolute intensity.
