Lithium-titanate (LTO) electrode was prepared by mixing 80 wt. % of the active material, 10 wt. % of C65 carbon black, and 10 wt. % of polyvinylidene fluoride (PVDF) binder in Nmethyl-2-pyrrolidone (NMP). The mixture was ball milled in a planetary ball mill (Retsch PM100) at 300 rpm for 30 min in an ambient atmosphere. Obtained slurry was doctor blade coated onto a copper current collector and cut into circular discs (ϕ = 12 mm), which were afterward dried at 100 °C under vacuum for 1 day. Obtained electrodes were pressed with 1 ton/cm 2 of pressure and dried for an additional 3 h at 100 °C under vacuum.