Figure 5: Evolution of the localized in situ spectra.

(a) Voltage and current as a function of time. (b,c) Evolution of the median position for four 100 μm-thick slices inside the LTO and LCO electrodes. The slices are colour-coded using increasing brightness with the distance from the separator. (d,e) Evolution of the full width at half-median height (WHMH) for each slice. Error bars indicate the uncertainty from the fit as described in Methods.