▎ 摘　　要

NOVELTY - Interface layer comprises a porous stainless steel current collector, a positive electrode, a solid electrolyte, a lithium metal negative electrode and a negative electrode current collector. A molten salt layer is provided between the anode and the solid electrolyte and/or the cathode and the solid electrolyte. The molten salt layer comprises a catalyst and a molten salt set on the carbon cloth. When the battery is at high temperature, molten salt is melted. A three-phase interface layer is formed between the anode and the solid electrolyte under the action of the catalyst, or a molten salt interface layer is formed between the negative electrode and the solid electrolyte. USE - High temperature solid lithium metal interface layer for a battery. ADVANTAGE - The three-phase interface layer is formed between the anode and the solid electrolyte under the action of the catalyst when the battery is at high temperature, or a molten salt interface layer is formed between the negative electrode and the solid electrolyte. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing an interface layer for high-temperature solid lithium metal, which comprises (A) weighing the mixed powder of Li2CO3, Al2O3, GeO2, NH4H2PO4 according to the mass ratio of 2.4:1:6.2:13.5, and milling it on a ball mill at 400 r/min-1 for 6h, and then at 900 degrees C, and sintering for 6h, weighing 0.75g and pressing it under 30MPa pressure for 5min, and finally sintering it again at 900 degrees C for 6h to form a solid LAGP ceramic electrolyte; (B) sputtering a layer of Ruthenium metal as a catalyst on the carbon cloth by magnetron sputtering, the sputtering power is 100W, the Argon rate is 40sccm, and the surface deposition thickness of Ruthenium metal is 10nm; (C) weighing out LiNO3, KNO2, and CsNO3 according to the mass ratio of 1:1.23:1.83, and putting them in the glove box after fully mixing, and the ternary salt is fully melted and mixed at high temperature on the heating table; and (D) applying molten salt on the solid electrolyte, and encapsulating the stainless steel current collector, the positive electrode, the solid electrolyte coated with molten salt, the lithium metal negative electrode, and the negative current collector in order. DESCRIPTION OF DRAWING(S) - The drawing shows the pictorial view of the interface layer.