Fig. 3: Demonstrating MCR-ALS adapted for electrolyte/SEI identification. | Nature Communications

Fig. 3: Demonstrating MCR-ALS adapted for electrolyte/SEI identification.

From: Tracking solid electrolyte interphase dynamics using operando fibre-optic infra-red spectroscopy and multivariate curve regression

Fig. 3

a Schematic description of the MCR-ALS algorithm with applied constraints. Salt concentration (blue to yellow) and time (greys) shadings are identical to Figs. 1 and 2, respectively. b GITT voltage profile of the Cu-PVDF//1 M LiPF6 in EC:DMC (LP30)//Li Metal cell (resting OCV time is highlighted in yellow). c Electrolyte spectral components (ST) from MCR-ALS. d Associated electrolyte components contributions (C). Black arrows act as a visual aide for solvation variations. e SEI spectral components from MCR-ALS; weak spectral components C7 and C8 are given in Supplementary Fig. 9. The grey box reports the MSE scores calculated on the reconstructed operando and calibration spectra. The IR bands of LEDC34,35 and LMC4 are shown below the plot for comparison. f Contributions of the SEI components contributions (C).

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