▎ 摘　　要

NOVELTY - Three-dimensional current collector with functional protective layer comprises three-dimensional current collector and functional protective layer. The functional protective layer is coated on the surface of the three-dimensional current collector. The functional protection layer includes silver, gold, magnesium, aluminum, zinc, tin, gallium, copper, aluminum oxide, zinc oxide, magnesium oxide, tin dioxide, vanadium pentoxide, niobium pentoxide, tantalum, copper oxide, molybdenum trioxide, and/or zirconium oxide. The functional protective layer includes three layers of vanadium pentoxide, niobium pentoxide, and tantalum pentoxide from inside to outside. The three-dimensional current collector is copper foil, copper foam, aluminum foil, nickel foil, nickel foam, stainless steel, conductive resin, polyethylene-based composite conductive material, graphene, nickel-titanium memory alloy, carbon paper, and/or carbon fiber. USE - The three-dimensional current collector with functional protective layer is useful in preparing composite electrode for lithium metal battery (all claimed). ADVANTAGE - The three-dimensional current collector has a large specific surface area, which is uniform and dense functional protective layer, after forming the composite electrode with the lithium metal, it not only can accelerate the transmission rate of the lithium ion, but also can prevent the electron from escaping to the electrode surface to attack the electrolyte to cause the capacity attenuation of the battery cycle initial stage, so as to adjust and control in lithium metal deposition process. The initial functional oxide protective layer of the full-solid-state battery cycle is lithiated, fully coupling with the 3D framework, realizing stable lithium deposition and stripping in the charging and discharging process, to exhibit excellent cycle stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are alo included for: a method for preparing three-dimensional current collector with functional protective layer; a composite electrode; a method for preparing composite electrode; and a lithium metal battery.