Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, the method including: a mixing step of obtaining a W-containing mixture of Li metal composite oxide particles represented by the formula: Li.sub.zNi.sub.1-x-yCO.sub.xM.sub.yO.sub.2 and composed of primary particles and secondary particles formed by aggregation of the primary particles, 2 mass % or more of water with respect to the oxide particles, and a W compound or a W compound and a Li compound, the W-containing mixture having a molar ratio of the total amount of Li contained in water and the solid W compound or the W compound and the Li compound of 3 to 5 with respect to the amount of W contained therein; and a heat treatment step of heating the W-containing mixture to form lithium tungstate on the surface of the primary particles of the Li metal composite oxide particles.

Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, the method including: a mixing step of obtaining a W-containing mixture of Li-metal composite oxide particles represented by the formula: Li.sub.zNi.sub.1-x-yCo.sub.xM.sub.yO.sub.2 and composed of primary particles and secondary particles formed by aggregation of the primary particles, 2 mass % or more of water with respect to the oxide particles, and a W compound or a W compound and a Li compound, the W-containing mixture having a molar ratio of the total amount of Li contained in the water and the solid W compound, or the W compound and the Li compound of 1.5 or more and less than 3.0 with respect to the amount of W contained therein; and a heat treatment step of heating the W-containing mixture to form lithium tungstate on the surface of the primary particles.

A material of Formula (I)
M.sub.yA.sub.xWO.sub.z(I) where M represents one or more monoatomic species, A represents one or more polyatomic cationic species, each having an ionic radius of no more than 2 ?, W is tungsten, O is oxygen, y is non-zero and is up to and including 0.32, x is non-zero and up to and including 0.32, and z is from 2.5 to 4.0, provided that x+y?0.33.

The synthesis of 2D metal chalcogenide nanosheets and metal-ion or metalloid-ion doped 2D metal chalcogenide nanosheets by adding a metal complex to a hot dispersing medium. The mean lateral dimension of the nanosheets may be controlled by appropriate temperature selection.

A dielectric material, a method of manufacturing thereof, and a dielectric device and an electronic device including the same. A dielectric material includes a layered metal oxide including a first layer having a positive charge and a second layer having a negative charge which are laminated, a monolayer nanosheet exfoliated from the layered metal oxide, a nanosheet laminate of the monolayer nanosheets, or a combination thereof, wherein the dielectric material includes a two-dimensional layered material having a two-dimensional crystal structure and the two-dimensional layered material is represented by Chemical Formula 1.

A cathode composition for a sodium-ion battery. The cathode composition may have the formula NaCr.sub.1-xM.sub.xO.sub.2, where M is one or more metal elements, and x is greater than 0 and less than or equal to 0.5.

A solid state ionic conductive electrolyte membrane may include a multi-channel porous support structure and a solid-state ionic conductive electrolyte. The multi-channel porous support structure may define a porous wall structure separating a first plurality of channels from a second plurality of channels, and a solid-state ionic conductive electrolyte may be positioned within pores of the porous wall structure of the multi-channel structure.

A coated substrate is provided that comprises: a substrate; and a barrier coating comprising a compound having the formula: Ln.sub.2ABO.sub.s, where Ln comprises scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or mixtures thereof; A comprises Si, Ti, Ge, Sn, Ce, Hf, Zr, or a combination thereof; and B comprises Mo, W, or a combination thereof. In one embodiment, B comprises Mo.

An infrared-shielding nanoparticle dispersion has a property whereby visible light is adequately transmitted, and light in the near-infrared region is adequately shielded. The infrared-shielding nanoparticles include a plural aggregate of electroconductive particles composed of a tungsten oxide expressed by the general formula WyOz (where W is tungsten, O is oxygen, and 2.2z/y2.999), and/or a composite tungsten oxide expressed by the general formula MxWyOz (where M is one or more elements selected from H, alkali metals, alkaline-earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; W is tungsten; O is oxygen; 0.001x/y1.1; and 2.2z/y3.0).

The present disclosure provides methods of preparing heterostructures of two or more transition metal dichalcogenides on a surface in a pattern in which the method does not require a mask or blocking agent to create a pattern on the surface. Also provided herein are ink compositions which are used in the methods described herein and include precursor materials that generate these transition metal dichalcogenides.