Lithium metal anode comprising langmuir-blodgett films as an artificial solid electrolyte interface layer, lithium metal battery comprising the same, and preparation method thereof

A preparation method of a composite layer, comprising:

• (A) forming at least one Langmuir-Blodgett artificial SEI layer on a substrate by performing a process of moving a Langmuir-Blodgett artificial SEI layer dispersed on a surface of a dispersion medium onto the substrate and drying the moved thin film layer at least once, and
• (B) transferring the at least one Langmuir-Blodgett artificial SEI layer formed on the substrate onto an alkali metal,
• wherein the at least one Langmuir-Blodgett artificial SEI layer is made of the same material or different materials, independently selected from the group consisting of graphene nanoparticle, nitrogen-doped graphene oxide, graphene oxide, lithium-terminated sulfonated titania nanopowder, reduced graphene oxide, graphene powder, crumpled graphene oxide, crumpled reduced graphene oxide, crumpled reduced graphene oxide with titania nanoparticle, titania nanopowder, and mixtures thereof, and
• wherein when two or more Langmuir-Blodgett artificial SEI layers are included, two Langmuir-Blodgett artificial SEI layers adjacent to each other are made of the same material or different materials.