Fig. 3: Electrochemical performance of K metal batteries.
From: Building electrode skins for ultra-stable potassium metal batteries
a CV curves. b Tafel curves and c electrochemical impedance spectra curves of symmetrical cells recorded at a scan rate of 0.2 mV s−1 between −0.2 and 0.2 V. d Voltage profiles of symmetric cells at various current densities. e K plating/stripping voltage profiles for the symmetric cells at a fixed current density of 0.5 mA cm−2 and capacity of 0.5 mAh cm−2 with KFSI electrolyte and (f) KPF6 electrolyte. g CE as a function of cycle number for Cu | |K asymmetric cells with KFSI electrolyte and (h) corresponding voltage profiles. i Comparison of the Cu | |K and K | | K cycle life between the K@MES and recently reported PMB.
