A positive electrode active material for lithium secondary batteries, includes: a lithium composite metal compound containing secondary particles formed by aggregation of primary particles; and a lithium-containing tungsten oxide, in which the lithium-containing tungsten oxide is present at least in interparticle spaces of the primary particles, and in a pore distribution of the positive electrode active material for lithium secondary batteries measured by a mercury intrusion method, a surface area of pores having a pore diameter in a range of 10 nm or more to 200 nm or less is 0.4 m.sup.2/g or more and 3.0 m.sup.2/g or less.

This present disclosure provides a core-shell quantum dot, a preparation method thereof, and a light-emitting device containing the same. The core of the core-shell quantum dot is CdSe.sub.XS.sub.(1-X), and the quantum dot shells include a first shell and a second shell, the first shell being selected from one or more of ZnSe, ZnSe.sub.YS.sub.(1-Y) and Cd.sub.(Z)Zn.sub.(1-Z)S, the second shell covering the first shell being one of Cd.sub.(Z)Zn.sub.(1-Z)S and ZnS, the maximum emission peak of the core-shell quantum dot is less than or equal to 480 nm, 0<X<1, 0<Y<1, 0<Z<1. The CdSe.sub.XS.sub.(1-X) core has a smaller bandgap and a shallower HOMO energy level, making hole injection easier.

The present invention provides composition comprising a metal oxide semiconductor nanomaterial coated or dispersed with a hemostatic polymer.

A material including TiO.sub.2 nanoparticles at least partially embedded in a matrix material of Ti.sub.xNb.sub.yO.sub.z, where 0<x2, 0<y24, and 0<z62, is provided. Methods of making the material are also provided.

A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, includes: a mixing step of adding a W compound powder having a solubility A adjusted to 2.0 g/L or less to a Li-metal composite oxide powder and stirring in water washing of the composite oxide powder, the solubility A being determined by stirring the W compound in water having a pH of 12.5 at 25 C. for 20 minutes, the composite oxide powder being represented by the formula: Li.sub.cNi.sub.1-x-yCo.sub.xM.sub.yO.sub.2 and composed of primary and secondary particles, followed by solid-liquid separation, to thereby obtain a tungsten-containing mixture with the tungsten compound dispersed in the composite oxide powder; and a heat-treating step of heat-treating the mixture to uniformly disperse W on the surface of primary particles and thereby form a compound containing W and Li from the W and Li in the mixture, on the surface of primary particles.

A process for making a cathode active material for a lithium ion battery is described. The process includes (a) a step of synthesizing a mixed oxide of formula Li.sub.1+xTM.sub.1xO.sub.2 at a temperature ranging from 750 to 1000 C. in an oxidizing atmosphere, where TM is a combination of two or more transition metals of Mn, Co and Ni and, optionally, at least one more metal of Ba, Al, Ti, Zr, W, Fe, Cr, K, Mo, Nb, Mg, Na and V, and x is a number ranging from zero to 0.2, (b) a step of cooling down the material obtained from step (a) to a temperature ranging from 100 to 400 C., (c) a step of adding at least one reactant of BF.sub.3, SO.sub.2 and SO.sub.3 at the temperature of 100 to 400 C., and (d) a step of cooling down to a temperature of 50 C. or below.

A method of making porous ceramic granules is provided. The method comprises heating pore-forming agent particles to a temperature above a glass transition temperature for the pore-forming agent particles; contacting the heated pore-forming agent particles with a ceramic material to form a mixture of pore-forming agent particles and ceramic material; heating the mixture to remove the pore-forming agent particles from the mixture to form a porous ceramic material; and micronizing the porous ceramic material to obtain the porous ceramic granules, wherein the porous ceramic granules have an average diameter from about 50 m to 800 m. The porous ceramic granules are also disclosed.

There is provided a paint formulation comprising a composite pigment, said composite pigment being selected from the group consisting of metal oxide/silica, metal oxide/silicate, metal oxide/alumina, metal oxide/metal oxide and metal oxide/zirconia, wherein the size and amount of said composite pigment are selected to increase the opacity of said paint formulation.

Composite oxide fine particles are produced by sol-gel method under conditions in which coarse particles and aggregated particles are unlikely to be generated, and the composite oxide fine particles are further wet-filtered using a filter to remove the coarse particles and the aggregated particles. Then, a salt is added to a dispersion of the composite oxide fine particles to produce weak aggregates of the composite oxide fine particles in the dispersion. A solid content is separated from the dispersion of the composite oxide fine particles containing the aggregates, and then dried. The solid content is easily made finer because no firm aggregates are generated during the drying. That is, composite oxide fine particles containing no coarse particles and aggregated particles are obtained. Use of a known cracking means can further reduce the amount of coarse particles.

An electrode material (1) includes: a porous support (2); and silver chloride (4) supported on the porous support (2). The porous support (2) is, for example, silica. The silica may be: wet-process silica such as precipitated silica or gelation method silica; dry-process silica; or the like.