▎ 摘　　要

NOVELTY - A multilayer lithium metal current collector comprises a conductive support layer (4), a lithium-philic nucleation layer (3), an electron/ion transport layer (2), and a nano-lithium ion rectifying layer (1) from bottom to top. The thickness of each layer is 5-200 μm. The conductive support layer (4) is a copper foil, nickel foam or stainless steel net substrate. The lithium-philic nucleation layer (3) is a graphene metal nano-lithium composite layer. The electron/ion transport layer (2) is made of graphene or MXene. The nano-lithium ion rectifying layer (1) uses metal-organic framework materials ZIF-8, ZIF-67 or MIL 101 (iron). USE - Multilayer lithium metal current collector is used for battery system with lithium metal as negative electrode (claimed). ADVANTAGE - The multilayer lithium metal current collector has high speed electronic/ion transmission channel, high processability, and high-efficiency nucleation site for lithium metal deposition, and promotes uniform nucleation and growth of lithium, and solves the potential safety hazard caused by the existing alkali metal battery dendritic crystal growth, and lithium metal utilization rate. The method is simple and requires low production cost, and has controllable area and thickness. The current collector DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of multilayer lithium metal current collector, which involves (s1) dissolving the graphene/metal nano material, graphene or MXene, and metal-organic framework material in an organic solvent to obtain a uniform dispersion with concentration of 1-10 mg/mL, (s2) uniformly distributing the three dispersion liquids by layer on the conductive supporting layer (4) by spraying or blade coating, rapidly evaporating the solvent left on the substrate surface by heating plate, preparing an electron/ion transport layer (2), and nano-lithium ion rectification layer (1), and (s3) drying the prepared multilayer current collector in a vacuum drying box, and removing the residual solvent.