Abstract: A solid electrolyte includes a sulfide solid electrolyte, a first binder, and a second binder, wherein the first binder and the second binder have a different energy of adhesion from each other with respect to the sulfide solid electrolyte, wherein the energy of adhesion of the first binder with respect to the sulfide solid electrolyte is less than ?300,000 kcal/mol and the energy of adhesion of the second binder with respect to the sulfide solid electrolyte is ?300,000 kcal/mol or more, wherein the energy of adhesion of the first binder with respect to the sulfide solid electrolyte has a greater absolute value than the energy of adhesion of the second binder. A solid-state secondary battery includes a cathode, an anode, and a solid electrolyte layer disposed therebetween, wherein at least one of the cathode, the anode, or the solid electrolyte layer includes the solid electrolyte.

Abstract: A solvent for preparing a solid electrolyte layer, wherein the solvent has a vapor pressure of about 26.66 Pascal to about 600 Pascal at 25° C., and wherein the solvent satisfies Equation 1: ?2=(?D)2+(?P)2+(?H)2??Equation 1 wherein ? is a Hansen solubility parameter, and ? is about 16.4 MPa1/2 to about 18.2 MPa1/2, ?D is a dispersion energy parameter, and ?D is about 15 MPa1/2 to about 18.2 MPa1/2, ?P is a polar-dipolar energy parameter, and ?P is about 0 MPa1/2 to about 4 MPa1/2, and ?H is a hydrogen bonding energy parameter, and ?H is about 0 MPa1/2 to about 6 MPa1/2.

Abstract: A cathode for a metal-air battery, the cathode including a mixed conductor; and first pores having a size of about 1 micrometer (?m) or greater, wherein an amount of the first pores is about 30 volume percent (volume %) or greater, with respect to a total volume of pores in the cathode, and a total porosity of the cathode is about 50% or greater, based on a total volume of the cathode.

Abstract: A cathode configured to use oxygen as a cathode active material includes: a porous film including a metal oxide, where a porosity of the porous film is about 50 volume percent to about 95 volume percent, based on a total volume of the porous film, and an amount of an organic component in the porous film is 0 to about 2 weight percent, based on a total weight of the porous film.

Abstract: A metal-air battery includes: a cell module configured to generate electricity by oxidation of a metal and reduction of oxygen and water; a water vapor supply unit configured to supply a first water vapor to the cell module; a moisture storage unit configured to supply a first moisture at a first flow rate to the water vapor supply unit; and a condensing unit configured to supply a second moisture at a second flow rate to the water vapor supply unit by condensing the water vapor condensed from the cell module.

Abstract: A solid electrolyte-cathode assembly including a plurality of cathode layers spaced apart from each other in a first direction, and an electrolyte layer including an amorphous solid electrolyte and a crystalline solid electrolyte including a plurality of crystalline solid electrolyte particles, wherein the amorphous solid electrolyte is on a surface of a cathode layer of the plurality of cathode layers and the crystalline solid electrolyte is within the amorphous solid electrolyte.

Abstract: A solid electrolyte includes: a first electrolyte layer including an inorganic lithium ion conductor; and a second electrolyte layer disposed on at least one side of the first electrolyte layer and including a compound represented by Formula 1 Li1?3x+4y(HfaM1?a)2?y(PO4?xQx)3 ??Formula 1 wherein in Formula 1, M is at least one of a monovalent to a hexavalent element, wherein 0<a?1, 0?x<1/3, and 0?y<2, and Q is F, Cl, Br, I, a pseudohalogen, or a combination thereof.

Abstract: A cathode configured to use oxygen as a cathode active material, the cathode including: a porous film, wherein the porous film includes a metal oxide, and wherein a surface of the porous film has root mean square (RMS) roughness (Rq) of about 0.01 micrometer to about 1 micrometer, and a porosity of the porous film is about 50 volume percent to about 99 volume percent, based on a total volume of the porous film.

Abstract: A polymer compound including a repeating unit represented by Formula: wherein R1, R2, R3, R4, a1, a2, and a11 in Formula 1 are as defined in the specification.

Abstract: A cathode configured to use oxygen as a cathode active material includes: a porous electrically conductive framework substrate; and a coating layer disposed on a surface of the porous electrically conductive framework substrate, wherein the coating layer includes at least one of a lithium-containing metal oxide or a composite including a lithium-containing metal oxide, and wherein a porosity of the porous electrically conductive framework substrate is about 70 percent to about 99 percent, based on a total volume of the cathode, and an areal resistance of the porous electrically conductive framework substrate is about 0.01 milliohms per square centimeter to about 100 milliohms per square centimeter.

Abstract: A composite cathode including: a cathode conductor layer including a mixed conductor; and a cathode junction layer adjacent to the cathode conductor layer, the cathode junction layer including a solid electrolyte, wherein the mixed conductor has a lithium-ion conductivity and an electrical conductivity, and wherein the solid electrolyte has a lithium-ion conductivity. In addition, the present disclosure provides a lithium-air battery including the composite cathode.

Abstract: A metal-air battery includes: a cell module configured to generate electricity by oxidation of a metal and reduction of oxygen and water; a water vapor supply unit configured to supply a first water vapor to the cell module; a moisture storage unit configured to supply a first moisture at a first flow rate to the water vapor supply unit; and a condensing unit configured to supply a second moisture at a second flow rate to the water vapor supply unit by condensing the water vapor condensed from the cell module.

Abstract: A cathode material, a cathode including the same, a method of manufacturing the cathode, and a lithium-air battery including the cathode, the cathode material configured to use water and oxygen as a cathode active material, the cathode material including a metal oxide represented by Formula 1: MxOy ??Formula 1 wherein, in Formula 1, M is Ti, Cu, Co, Ce, Cu, Fe, Eu, Cd, Co, Cr, Mn, Mo, Nb, Pu, Ru, Tc, U, V, Ir, or a combination thereof, 0<x?20, 0<y?34, and 0.05<y/x<10, with the proviso that when M is Mn, 0.05<y/x?1.4, wherein the cathode material has a phase stability value of about 1.2 electronvolts or less at a pH of 12 to 14 and at a voltage of 2 to 4.5 volts with respect to lithium metal, and a bandgap energy of 0 electronvolts when determined by density functional theory.

Abstract: A lithium air battery including: a lithium air cell including a cathode configured to use oxygen as cathode active materials, an anode capable of storing and releasing lithium ions, and an electrolyte disposed between the cathode and the anode; and a water vapour supply unit including a basic metal compound and water, wherein the water vapour supply unit is configured to supply water to the cathode of the lithium air cell.

Abstract: The present invention relates to a cathode, a lithium air battery including a cathode, and a method of preparing the lithium air battery. A cathode configured to use oxygen as a cathode active material, the cathode including: a lithium alloy represented by Formula 1 LixMy??Formula 1 wherein, in Formula 1, M is Pb, Sn, Mo, Hf, U, Nb, Th, Ta, Bi, Mg, Al, Si, Zn, Ag, Cd, In, Sb, Pt, or Au, 0<x?10, 0<y?10, and 0<x/y<10.

Abstract: A gas diffusion layer for a metal-air battery, the gas diffusion layer including: a porous layer including non-conductive fiber structures, a conductive carbon layer including a carbon material that is disposed on a surface of a non-conductive fiber structure of the plurality of non-conductive fiber structures.

Abstract: A cathode configured to use oxygen as a cathode active material comprising a conductive layer including an electronic conductor, wherein the conductive layer is free of pores.

Abstract: A positive electrode includes a porous electroconductive metal oxide represented by Formula 1, wherein the electroconductive metal oxide has a specific surface area of about 0.01 m2/g to about 1000 m2/g, LxRuyOx ??Formula 1 wherein, in Formula 1, L is at least one of a lanthanide element or an actinide element, and 0<x<1, 0<y<1, and 0<z?1.

Abstract: A carbon composite includes: a carbonaceous core; and a polymer electrolyte membrane disposed on the carbonaceous core, the polymer electrolyte membrane including: a first ionic liquid, a first polymer layer disposed on the carbonaceous core and having a first ionic charge, and a second polymer layer disposed on the first polymer layer and having a second ionic charge opposite to the first charge of the first polymer layer.

Abstract: A cathode configured to use oxygen as a cathode active material includes: a porous film including a metal oxide, where a porosity of the porous film is about 50 volume percent to about 95 volume percent, based on a total volume of the porous film, and an amount of an organic component in the porous film is 0 to about 2 weight percent, based on a total weight of the porous film.