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. 2023 Jan 18;14:299. doi: 10.1038/s41467-023-35934-1

Fig. 5. Ex situ postmortem XPS characterization of negative and positive electrodes harvested from Li||NCM811 cells.

Fig. 5

a–d Depth profiles of SEI layers on Li anode surface in Li||NCM811 cells after cycling at 0.2 A g–1 for 20 cycles with 1 M LiPF6-EC-DEC (a), 2 M LiFSI-DME (b), 2 M LiFSI-DMP (c), and 2 M LiFSI-TFDMP (d). e–l C 1 s and O 1 s XPS profiles of SEI layers on Li anodes after 12 minutes sputtering with 1 M LiPF6-EC-DEC (e, i), 2 M LiFSI-DME (f, j), 2 M LiFSI-DMP (g, k) and 2 M LiFSI-TFDMP (h, l). m–p F 1 s XPS profiles of CEI layers on NCM811 cathodes with 1 M LiPF6-EC-DEC (m), 2 M LiFSI-DME (n), 2 M LiFSI-DMP (o), and 2 M LiFSI-TFDMP (p). Electrodes were harvested at a fully discharged (2.8 V) cell state.