Fig. 6: Operando TEY-XAS with FEC additive.

TEY XAS of (a) the O K-edge and (b) F K-edge taken during cycling at different potentials ranging from 2.0 V down to 0.1 V, for a cell containing LP30 electrolyte with FEC as an additive. Note that two O K-edge spectra are displayed at 1.0 V, recorded 15 mins apart from one another.