A non-aqueous electrolyte secondary battery positive electrode capable of suppressing a decomposition reaction of an electrolyte solution in an overcharged state is provided. A non-aqueous electrolyte secondary battery positive electrode according to this embodiment includes a positive electrode active material layer which includes a positive electrode active material (54) containing a lithium transition metal oxide, a tungsten compound (56), a phosphoric acid compound (58) not in contact with the positive electrode active material (54), and an electrically conductive agent (52) in contact with the tungsten compound (56) and the phosphoric acid compound (58).

A highly active trimetallic mixed transition metal oxide material has been developed. The material may be sulfided to generate metal sulfides which are used as a catalyst in a conversion process such as hydroprocessing. The hydroprocessing may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

The invention relates to a chemical compound of the formula Ni.sub.bM1.sub.cM2.sub.d(O).sub.x(OH).sub.y, wherein M1 denotes at least one element from the group consisting of Fe, Co, Mg, Zn, Cu and/or mixtures thereof, M2 denotes at least one element from the group consisting of Mn, Al, B, Ca, Cr and/or mixtures thereof, wherein b0.8, c0.5, d0.5, and x is a number between 0.1 and 0.8, y is a number between 1.2 and 1.9, and x+y=2. A process for the preparation thereof, and the use thereof as a precursor for the preparation of cathode material for secondary lithium batteries are described.

A method of producing a positive electrode active material for a nonaqueous electrolyte secondary battery, the method includes preparing nickel-containing composite oxide particles having a ratio .sup.1D.sub.90/.sup.1D.sub.10 of a 90% particle size .sup.1D.sub.90 to a 10% particle size .sup.1D.sub.10 in volume-based cumulative particle size distribution is 3 or less; mixing the composite oxide particles and a lithium compound to obtain a first mixture; subjecting the first mixture to a first heat treatment at a first temperature and a second heat treatment at a second temperature higher than the first temperature to obtain a first heat-treated product; and subjecting the first heat-treated material to a dispersion treatment.

A method for manufacturing a ferromagnetic-particle includes preparing a manufacturing apparatus including a single mode cavity that resonates with a microwave of a predetermined wavelength; a microwave oscillator electrically connected to the single mode cavity and configured to introduce the microwave of a predetermined wavelength into the single mode cavity; a pipe disposed to pass linearly through an inside of the single mode cavity, the pipe being formed of a dielectric material; and a pump configured to introduce, from one end of the pipe, an alkaline reaction liquid in which metal ions of a ferromagnetic metal and hydroxide ions are dissolved; and reacting the reaction liquid in the pipe, introduced by the pump, by introducing the microwave into the single mode cavity so as to generate the ferromagnetic-particle in the pipe.

Disclosed are a positive active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same. The positive active material includes a first positive active material in a form of secondary particles including a plurality of primary particles that are aggregated together, and a second positive active material having a single particle form, wherein both of the first positive active material and the second positive active material are nickel-based positive active materials, each of the first positive active material and the second positive active material is coated with cobalt, and a maximum roughness of a surface of the second positive active material is greater than or equal to about 15 nm.

A lithium-containing complex transition metal oxide forming the positive electrode active material of a non-aqueous electrolyte secondary cell in one embodiment is a secondary particle obtained by aggregating primary particles. Ion chromatography analysis of a sample obtained by adding the positive electrode active material to an alkali solution and absorbing a distillate thereof in sulfuric acid results in detection of 2-200 pm of ammonia relative to the mass of the positive electrode active material. When a filtrate of an aqueous dispersion in which 1 g of the positive electrode active material is dispersed in 70 ml of pure water is titrated with hydrochloric acid, the value of Y?X is 50-300 mol/g and the value of X?(Y?X) is no higher than 150 mol/g, with X mol/g being the acid consumption until a first inflection point on the pH curve and Y mol/g being the acid consumption until a second inflection point.

A nickel cobalt manganese composite hydroxide with low impurity content and high reactivity when synthesizing a positive electrode active material, which can be used as a precursor of the positive electrode active material for non-aqueous electrolyte secondary batteries with low irreversible capacity, represented by a general formula: Ni.sub.xCo.sub.yMn.sub.zM.sub.t(OH).sub.2+a (wherein x+y+z+t=1, 0.20x0.80, 0.10y0.50, 0.10z0.90, 0t0.10, 0a0.5, and M is at least one additive element selected from Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, W), which includes: spherical secondary particles formed by aggregation of a plurality of plate-shaped primary particles, which have an average particle diameter of 3 m to 20 m, a sulfate radical content of 1.0 mass % or less, a chlorine content of 0.5 mass % or less, and a carbonate radical content of 1.0 mass % to 2.5 mass %.

A method of producing a positive electrode active material for a nonaqueous electrolyte secondary battery, the method includes preparing nickel-containing composite oxide particles having a ratio .sup.1D.sub.90/.sup.1D.sub.10 of a 90% particle size .sup.1D.sub.90 to a 10% particle size .sup.1D.sub.10 in volume-based cumulative particle size distribution of 3 or less; obtaining a raw material mixture containing the composite oxide particles and a lithium compound and having a ratio of a total number of moles of lithium to a total number of moles of metal elements contained in the composite oxide in a range of 1 to 1.3; subjecting the raw material mixture to a heat treatment to obtain a heat-treated material; subjecting the heat-treated material to a dry-dispersion treatment to obtain a first dispersion; and bringing the first dispersion into contact with a liquid medium to obtain a second dispersion.

An inorganic green pigment includes a material with spinel structure of the general formula selected from the following formulas a) (A.sub.1-xB.sub.1+x)(C.sub.3-x-yD.sub.2xB.sub.1-x-2yNi.sub.3y)O.sub.8, wherein 0.05x0.9 and 0.05y0.5, and wherein x+2y1; b) (A.sub.1-xB.sub.1+x)(C.sub.3-x-yD.sub.2x-yB.sub.1-x-yNi.sub.2y)O.sub.8, wherein 0.05x0.5 and 0.05y0.5; c) (A.sub.1-xB.sub.1+x)(C.sub.3-x-4yD.sub.2xB.sub.1-x+yNb.sub.y)O.sub.8, wherein 0.05x0.5 and 0.05y0.2; d) (A.sub.1-xB.sub.1+x)(C.sub.3-xD.sub.2x-2yB.sub.1-x+yNb.sub.y)O.sub.8, wherein 0.05x0.9 and 0.05y0.2, and wherein xy; and e) (A.sub.1-xB.sub.1+x)(C.sub.3-x-3yD.sub.2xB.sub.1-xNb.sub.2yNi.sub.y)O.sub.8, wherein 0.05x0.9 and 0.05y0.2, wherein A is at least one element selected from Co, Zn, Ca, Mg and Cu, wherein B is at least one element selected from Li and Na, wherein C is at least one element selected from Ti, Mn, Sn and Ge, and wherein D is at least one element selected from Cr, B, Fe, Mn and Al.