Electrode slurries consisted of 80 wt.% of active material, 10 wt.% of conductive agent (C65, C-NERGY), and 10 wt.% of binder (polyvinylidene fluoride, PVDF, Solvay) dispersed in a N-Methyl-2-pyrrolidone (NMP, Thermo Scientific). Prior to the mixing, powder components were ground in a mortar to uniform the particles. All constituents were added to a plastic container and transferred to a speed mixer (ARE-250, Thinky) and mixed for 10 min at 10.000 rpm. Electrode slurries were later cast on carbon-coated aluminum foils with a wet thickness of about 60 µm by using a doctor blade. Wet films were dried at 80 °C overnight, followed by punching circular electrodes with a diameter of 12 mm. Such prepared electrodes were further dried at 80 °C under vacuum overnight before being transferred to an argon filled glovebox (MBraun, H2O and O2 content below 1 ppm).