Fig. 3: SEI chemical composition by XPS measurement on µSi electrodes after 50 cycles in Li||µSi half cells with different electrolytes.
From: High voltage electrolytes for lithium-ion batteries with micro-sized silicon anodes
C1s (a) and O1s (b) spectra are displayed in columns, which show the corresponding depth profiling results (from left to right, being FST, FFT, and EE, respectively). The relative intensity for all spectra was shown in arbitrary units (a.u.) without labeling the y-axis for clarity. All the XPS results were fitted with CasaXPS software. The binding energy was calibrated with C1s at 284.8 eV. Only the C, O, F, and Si atomic ratios are shown in the stacked columns for clear comparison, full data can be found in Supporting Information (Supplementary Figs. 11–14).
