The present disclosure relates to a method for producing a porous metal oxide powder, and more particularly, to a method for producing a porous metal oxide powder including obtaining metal oxide precipitate slurry from an aqueous metal salt solution dissolving a water-soluble metal salt in water; solvent exchanging the water by mixing a butanol solvent and the metal oxide precipitate slurry; and drying the solvent exchanged metal oxide under atmospheric pressure conditions.

A Ni-rich ternary cathode material, a preparation method and application thereof are disclosed. The method for preparing a Ni-rich ternary cathode material includes: using a Ni—Co—Mn ternary cathode material as a precursor and a metal boride as a modifier, adding a lithium-derived material, heating for a sintering, to prepare the Ni-rich ternary cathode material.

A Ni-rich ternary cathode material, a preparation method and application thereof are disclosed. The method for preparing a Ni-rich ternary cathode material includes: using a Ni—Co—Mn ternary cathode material as a precursor and a metal boride as a modifier, adding a lithium-derived material, heating for a sintering, to prepare the Ni-rich ternary cathode material.

Disclose herein are processes for producing a nickel cobalt aluminum composite hydroxide and producing a positive electrode active material for non-aqueous electrolyte secondary batteries. Nucleation is performed by controlling an aqueous solution for nucleation containing a nickel-containing metal compound, cobalt-containing metal compound, ammonium ion supplier, and aluminum source so that the aqueous solution's pH for nucleation is 12.0 to 13.4, and then in a particle growth step, particle growth is performed in an aqueous solution for particle growth obtained by controlling the aqueous solution for nucleation obtained in the nucleation step so that the pH of aqueous solution for nucleation is 10.5 to 12.0. Further, in nucleation step, an aqueous solution containing aluminum and sodium is used as the aluminum source contained in aqueous solution for nucleation, and the mole ratio of sodium to aluminum in aqueous solution containing aluminum and sodium is adjusted to 1.5 to 3.0.

A nickel composite hydroxide containing reduced amounts of sulfate radicals and chlorine as impurities. The nickel composite hydroxide is represented by Ni.sub.1-x-yCo.sub.xAl.sub.y(OH).sub.2+α(0.05≦x≦0.01≦y≦0.2, x+y<0.4, and 0≦α<0.5), and includes spherical secondary particles formed by aggregation of plurality of plate-shaped primary particles, secondary particles have an average particle diameter of 3-20 μm, sulfate radical content of 1.0 mass % or less, chlorine content of 0.5 mass % or less, and carbonate radical content of 1.0-2.5 mass %. The nickel composite hydroxide is obtained by a process including a crystallization step in which crystallization is performed in reaction solution obtained by adding alkali solution to aqueous solution containing mixed aqueous solution containing nickel and cobalt, ammonium ion supplier, and aluminum source. The alkali solution is mixed aqueous solution of alkali metal hydroxide and carbonate, and ratio of carbonate to alkali metal hydroxide in mixed aqueous solution represented by [C0.sub.3.sup.2−]/[OH.sup.−]=0.002 or more but 0.050 or less.

A nickel composite hydroxide containing reduced amounts of sulfate radicals and chlorine as impurities. The nickel composite hydroxide is represented by Ni.sub.1-x-yCo.sub.xAl.sub.y(OH).sub.2+α(0.05≦x≦0.01≦y≦0.2, x+y<0.4, and 0≦α<0.5), and includes spherical secondary particles formed by aggregation of plurality of plate-shaped primary particles, secondary particles have an average particle diameter of 3-20 μm, sulfate radical content of 1.0 mass % or less, chlorine content of 0.5 mass % or less, and carbonate radical content of 1.0-2.5 mass %. The nickel composite hydroxide is obtained by a process including a crystallization step in which crystallization is performed in reaction solution obtained by adding alkali solution to aqueous solution containing mixed aqueous solution containing nickel and cobalt, ammonium ion supplier, and aluminum source. The alkali solution is mixed aqueous solution of alkali metal hydroxide and carbonate, and ratio of carbonate to alkali metal hydroxide in mixed aqueous solution represented by [C0.sub.3.sup.2−]/[OH.sup.−]=0.002 or more but 0.050 or less.

A method for manufacturing a positive active material is provided. The method includes forming a positive active material precursor including nickel, mixing and firing the positive active material precursor and lithium salt to form a preliminary positive active material particle, forming a coating material including fluorine on the preliminary positive active material particle by dry-mixing the preliminary positive active material particle with a coating source including fluorine, and manufacturing a positive active material particle by thermally treating the preliminary positive active material particle on which the coating material is formed.

A method for manufacturing a positive active material is provided. The method includes forming a positive active material precursor including nickel, mixing and firing the positive active material precursor and lithium salt to form a preliminary positive active material particle, forming a coating material including fluorine on the preliminary positive active material particle by dry-mixing the preliminary positive active material particle with a coating source including fluorine, and manufacturing a positive active material particle by thermally treating the preliminary positive active material particle on which the coating material is formed.

Nickel hydroxide obtained by neutralizing an aqueous nickel sulfate solution with an alkali is heat-treated in a non-reducing atmosphere at a temperature higher than 850° C. but lower than 1050° C. to form nickel oxide particles, and a sintered compact of nickel oxide particles that may be formed during the heat treatment is pulverized by preferably allowing the nickel oxide particles to collide with one another. The thus obtained nickel oxide fine powder has a sulfur content of 400 mass ppm or less, a chlorine content of 50 mass ppm or less, a sodium content of 100 mass ppm or less, and a specific surface area of 3 m.sup.2/g or more but less than 6 m.sup.2/g.

Nickel hydroxide obtained by neutralizing an aqueous nickel sulfate solution with an alkali is heat-treated in a non-reducing atmosphere at a temperature higher than 850° C. but lower than 1050° C. to form nickel oxide particles, and a sintered compact of nickel oxide particles that may be formed during the heat treatment is pulverized by preferably allowing the nickel oxide particles to collide with one another. The thus obtained nickel oxide fine powder has a sulfur content of 400 mass ppm or less, a chlorine content of 50 mass ppm or less, a sodium content of 100 mass ppm or less, and a specific surface area of 3 m.sup.2/g or more but less than 6 m.sup.2/g.