Fig. 4
From: Porous amorphous silicon film anodes for high-capacity and stable all-solid-state lithium batteries
Electrochemical impedance spectra of amorphous Si films measured after 101st film charging. a, b Electrochemical impedance spectra of a non-porous and b porous Si films showing areal capacity of ~0.6 mAh cm−2. c, d Electrochemical impedance spectra of c non-porous and d porous Si films showing areal capacity of ~2 mAh cm−2. The films were cycled with a current density of 0.1 mA cm−2 in the potential range of 0.01–1.2 V vs. Li+/Li, whose cycling performances over the first 100 cycles are shown in Figs. 2 and 3. The colour scale bar shown on the right side of the figure represents the frequency of the applied AC perturbation signal. The spectra were obtained at open-circuit voltages indicated in the corresponding panels after 5 h of rest. The areal mass loadings and thicknesses of the as-prepared films are also indicated in the corresponding panels
