Figure 1. The schematic illustration of the coated lithium metal: GPE represents a gel polymer electrolyte consisting of a sandwiched polymer membrane, PVDF/PMMA/PVDF, saturating with 1 mol l⁻¹ LiClO₄ solution in ethylene carbonate, diethyl carbonate and dimethyl carbonate (volumetric ratio is 1:1:1), and LISICON film refers to a solid film consisting of Li₂O-Al₂O₃-SiO₂-P₂O₅-TiO₂-GeO₂.

The shape of Li metal is square with 2 mm (width) × 5 mm (length) × 0.5 mm (thickness).