Abstract: Disclosed is a multi-band base station antenna using a selective shielding surface. The disclosed antenna comprises: a selective shielding surface which passes signals in a preset frequency band; a plurality of low-band radiators located on the selective shielding surface; a reflection plate disposed below the selective shielding surface and spaced apart from the selective shielding surface; and a plurality of high-band radiators coupled onto the reflection plate, wherein the selective shielding surface has a pass band configured to pass signals emitted from the high-band radiators and block signals emitted from the low-band radiators.

Abstract: Provided is an antenna device capable of ensuring an installation space for components related to an antenna and eliminating a dead zone of a signal transmitted or received by the antenna by tilting an antenna unit.

Abstract: The present invention relates to a clamping apparatus for an antenna and, particularly, to a clamping apparatus for an antenna, comprising: an arm unit which is coupled to a support pole vertically provided in the up-and-down direction and extends in the horizontal direction with respect to the support pole; a clamping unit having one end provided with an antenna device and the other end coupled to the distal end of the arm unit, wherein the clamping unit is provided to be rotatable leftward and rightward or to be tiltable upward and downward, so as to rotate the antenna device; and a rotation-auxiliary mounting unit coupled onto the support pole corresponding to the lower part of the arm unit, wherein when a rotation angle of the arm unit is changed, the rotation-auxiliary mounting unit rotatably supports the arm unit in the rotation direction of the arm unit while supporting the weights of the arm unit and the antenna device.

Abstract: A sealing apparatus is disclosed. In some implementations, the sealing apparatus includes a process chamber having an internal space, a cell loading portion configured to load a plurality of battery cells and enter the internal space of the process chamber, a plurality of sealing units disposed in the internal space of the process chamber, the plurality of sealing units configured to partially seal the battery cells, respectively, and a driving portion configured to move the plurality of sealing units such that the plurality of sealing units come into contact with the plurality of battery cells, respectively.

Abstract: An embodiment of the present invention provides a MXene nanodot core-carbon shell multifunctional catalyst including a MXene nanodot core and a carbon shell surrounding the MXene nanodot core. By introducing the carbon shell surrounding the nanodot core, the stability of the catalyst is ensured, thereby providing effects in that the catalyst may function under various conditions.

Abstract: Disclosed are a metal carbide catalyst composite for abifunctional zinc-air battery, which contains both vanadium metal and heterogeneous transition metal, and a zinc-air battery system containing the same. According to an embodiment of the disclosure, a catalyst reaction area is increased by substituted iron and vanadium ions of the metal carbide catalyst composite for the zinc-air battery, thereby exhibiting high activity for ORR performance as well as OER performance. Additionally, an embodiment of the present invention provides a material for a positive electrode active material for secondary batteries and a method for manufacturing a material for a positive active material for secondary batteries. In detail, it provides a material for secondary battery positive electrode active material and a method of manufacturing a material for secondary battery positive electrode active material that can utilize a carbon-coated iron-vanadium metal oxide structure as a secondary battery positive active material.

Abstract: An embodiment of the present invention provides an electrocatalyst composite including a 2D transition metal chalcogenide material for water electrolysis and a method for manufacturing the same. According to one embodiment of the present invention, the electrocatalyst composite for water electrolysis is manufactured by hetero-junctioning 2D nickel cobalt sulfide (NiCo2S4) and 2D rhenium sulfide (ReS2) to allow for high activity and application over a broad pH range during water electrolysis.

Abstract: There are provided a metal carbide catalyst complex for a bifunctional zinc-air battery, containing vanadium metal and a different transition metal, and a zinc-air battery system including the same. Because a catalytic reaction region may be increased by a substituted iron ion and a substituted vanadium ion in a metal carbide catalyst complex for a zinc-air battery, high activity for oxygen evolution reaction (OER) performance and high activity for oxygen reduction reaction (ORR) performance may be exhibited.

Abstract: An embodiment of the present disclosure provides an ion battery electrode material that significantly improves scan rate, capacity exhibiting, safety, and energy density compared to conventional ion batteries by manufacturing bulk POM in a layered structure in which bulk POM is uniformly distributed in several nanometers on the surface of rGO/PPy, and a method for synthesizing ion battery electrode materials.

Abstract: Lignin gel-based electrolyte is disclosed. The lignin gel-based electrolyte includes a lignin polymer network containing lignin molecules and a crosslinking agent to crosslink the lignin molecules; and liquid electrolyte contained within the lignin polymer network. The lignin gel-based electrolyte may have high ionic conductivity and maintain excellent mechanical stability.

Abstract: Disclosed is a method for manufacturing a functionalized separator having a zwitterionic coating thereon. The method includes preparing a porous separator; coating a linker on a surface of the porous separator; and chemically reacting zwitterions with the linker such the zwitterions are grafted to the linker on the surface of the separator. The zwitterions grafted to the linker acts as a monolayer to functionalize the surface of the separator. The functionalized separator may disallow elution of polysulfide compound in a lithium-sulfur battery. Further, the functionalized separator may increase ion conductivity of electrolyte of the lithium-sulfur battery and thus ensure high output characteristics.

Abstract: An embodiment of the present invention provides a MXene nanodot core-carbon shell multifunctional catalyst including a MXene nanodot core and a carbon shell surrounding the MXene nanodot core. By introducing the carbon shell surrounding the nanodot core, the stability of the catalyst is ensured, thereby providing effects in that the catalyst may function under various conditions.

Abstract: Disclosed is a black phosphorus-polymer composite solid electrolyte including a polymer network structure in which nanofibers made of a second polymer material are connected to each other; a first polymer material received in the polymer network structure and having ionic conductivity; black phosphorus dispersed in the first polymer material, wherein the black phosphorus has an oxygen containing functional group; and a lithium salt compound contained in the first polymer material.

Abstract: Disclosed is a method for manufacturing a functionalized separator having a zwitterionic coating thereon. The method includes preparing a porous separator; coating a linker on a surface of the porous separator; and chemically reacting zwitterions with the linker such the zwitterions are grafted to the linker on the surface of the separator. The zwitterions grafted to the linker acts as a monolayer to functionalize the surface of the separator. The functionalized separator may disallow elution of polysulfide compound in a lithium-sulfur battery. Further, the functionalized separator may increase ion conductivity of electrolyte of the lithium-sulfur battery and thus ensure high output characteristics.

Abstract: Disclosed is a black phosphorus-polymer composite solid electrolyte including a polymer network structure in which nanofibers made of a second polymer material are connected to each other; a first polymer material received in the polymer network structure and having ionic conductivity; black phosphorus dispersed in the first polymer material, wherein the black phosphorus has an oxygen containing functional group; and a lithium salt compound contained in the first polymer material.

Abstract: Lignin gel-based electrolyte is disclosed. The lignin gel-based electrolyte includes a lignin polymer network containing lignin molecules and a crosslinking agent to crosslink the lignin molecules; and liquid electrolyte contained within the lignin polymer network. The lignin gel-based electrolyte may have high ionic conductivity and maintain excellent mechanical stability.

Abstract: The present invention relates to a nitrogen-doped 3-D porous graphene assembly and a method of preparing the same. The present invention provides a method of preparing a nitrogen-doped graphene assembly, the method including the steps of mixing a graphene oxide solution with a melamine solution, freezing the mixed solution of graphene oxide and melamine, drying the frozen solution in a frozen state to prepare a graphene assembly, and heating the graphene assembly at a predetermined temperature under the argon atmosphere for a predetermined to time, in which a mass ratio of the graphene oxide and the melamine in the mixed solution is 19:1 to 4:1. According to the present invention, a uniformly nitrogen-doped 3-D porous graphene assembly may be synthesized.

Abstract: Disclosed are a graphene composite nanofiber and a preparation method thereof. The graphene composite nanofiber is produced by dispersing graphenes to at least one of a surface and inside of a polymer nanofiber or a carbon nanofiber having a diameter of 1˜1000 nm, and the graphenes include at least one type of monolayer graphenes, and multilayer graphenes having a thickness of 10 nm or less. The graphene composite nanofiber can be applied to various industrial fields, e.g., a light emitting display, a micro resonator, a transistor, a sensor, a transparent electrode, a fuel cell, a solar cell, a secondary cell, and a composite material, owing to a unique structure and property of graphene.

Abstract: Disclosed are a graphene composite nanofiber and a preparation method thereof. The graphene composite nanofiber is produced by dispersing graphenes to at least one of a surface and inside of a polymer nanofiber or a carbon nanofiber having a diameter of 1˜1000 nm, and the graphenes include at least one type of monolayer graphenes, and multilayer graphenes having a thickness of 10 nm or less. The graphene composite nanofiber can be applied to various industrial fields, e.g., a light emitting display, a micro resonator, a transistor, a sensor, a transparent electrode, a fuel cell, a solar cell, a secondary cell, and a composite material, owing to a unique structure and property of graphene.