The mixture was stirred at 78 °C, and a dough was obtained, pressed and rolled on a glass plate into a thin sheet. The electrode sheet was dried at 120 °C and calendared to achieve a final thickness of about 150 μm, from which the disc electrodes were punched out. The electrolyte was 1 mol/L LiPF 6 (origin, grade) in EC:DMC solvent (origin, grade) soaked in a GF/A glassy fiber that acts as a separator. The pre-lithiation of F-garnet was performed in a separate cell versus metallic lithium as counter and reference electrodes. Selected area electron diffraction (SAED) experiments were performed using a FEI Tecnai F20 microscope, operated at 200 kV.