A plate-like alumina particle containing a coloring component is provided. A plate-like alumina particle containing molybdenum, silicon, and a coloring component. A method for manufacturing the plate-like alumina particle, the method including the steps of mixing an aluminum compound containing an aluminum element, a molybdenum compound containing a molybdenum element, silicon or a silicon compound, and a coloring component so as to produce a mixture and calcining the resulting mixture.

This positive electrode active material for nonaqueous electrolyte secondary batteries contains a lithium transition metal composite oxide. This lithium transition metal composite oxide is represented by general formula Li.sub.xMn.sub.yNi.sub.zMe.sub.2-x-y-zO.sub.aF.sub.b (wherein 1≤x≤1.2; 0.4≤y≤0.7; 0.1≤z≤0.4; 0<b≤0.2; 1.9≤a+b≤2.1; and Me represents at least one element selected from among Co, Al, Ti, Ge, Nb, Sr, Mg, Si, P and Sb), while having a BET specific surface area of from 1 m.sup.2/g to 4 m.sup.2/g and an average pore diameter of 100 nm or less.

A lithium ion conductive material has a composition formula of Li.sub.a(OH).sub.bF.sub.cCl.sub.dBr.sub.1-d, where 1.8≤a≤2.3, b=a −c−1, 0<c≤0.30, 0<d<1, and includes an antiperovskite-type crystal phase. The lithium ion conductive material is manufactured, for example, by heating LiOH, LiF, LiCl, and LiBr at a temperature not lower than 250° C. and not higher than 600° C. for 0.1 hours or more while stirring them at a molar ratio of 1:X:Y:Z (where 0.03≤X≤0.3, 0.2≤Y<1.1, 0<Z<1) under an Ar gas atmosphere.

The method of preparing a positive electrode capable of reducing the usage amount of a rinsing solution, and minimizing the surface degradation of a positive electrode active material is provided. A method of preparing a positive electrode active material includes: (A) preparing a lithium transition metal oxide; and (B) mixing the lithium transition metal oxide and a rinsing solution and performing rinsing and drying, wherein the rinsing solution includes one or more additive of LiOH, NaOH, or KOH, the additive is included in an amount of 3,000 ppm to 18,000 ppm relative to the lithium transition metal oxide in the rinsing solution, and the rinsing solution has a pH of 12 or more.

A lithium transition metal oxide which is capable of minimizing a side reaction with an electrolyte, thereby suppressing the generation of gas during charging and discharging of a lithium secondary battery is provided. The lithium transition metal oxide is a lithium cobalt oxide which contains a hetero-element, wherein the hetero-element includes a 4th period transition metal; and at least one selected from the group consisting of a group 2 element, a group 13 element, a group 14 element, a 5th period transition metal, and a 6th period transition metal. The lithium transition metal oxide has a cumulative 50% particle diameter (D50) of 10.0 μm to 25.0 μm and a ratio (D.sub.max/D.sub.min) of a maximum particle diameter (D.sub.max) to a minimum particle diameter (D.sub.min) of 10.0 to 60.0 when measured by laser diffraction scattering particle size distribution.

A method of turning a catalytic material by altering the charge state of a catalyst support. The catalyst support is intercalated with a metal ion, altering the charge state to alter and/or augment the catalytic activity of the catalyst material.

Provided are a positive electrode active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same, the positive electrode active material for a rechargeable lithium battery including a secondary particle in which a plurality of primary particles including a lithium nickel-based composite oxide are aggregated, wherein at least a portion of the primary particles are arranged radially, a boron coating layer on the surface of the secondary particles and containing lithium borate, and a boron-doped layer inside the primary particle exposed to the surface of the secondary particle.

A process for producing a lithium transition metal oxide is provided. The process comprises pre-calcination of a transition metal precursor in the absence of a lithium source followed by a high-temperature calcination of the pre-calcined intermediate compound in the presence of a lithium source.

Disclosed are an aluminum-coated precursor and a preparation method therefor. The aluminum coated precursor has a chemical formula of xMCO.sub.3(1-x).Al(OH).sub.3, wherein M is at least one of nickel, cobalt and manganese, and x is 0.995-0.999. The aluminum-coated precursor has the advantages of a controllable particle size and uniform particle size distribution, a high degree of sphericity, a smooth particle surface, a high tap density, not easily breaking, and an excellent electrochemical performance and energy density.

A nonaqueous electrolyte energy storage device according to one aspect of the present invention is a nonaqueous electrolyte energy storage device including a positive electrode having positive active material particles, in which the positive active material particles contain a lithium transition metal composite oxide having an α-NaFeO.sub.2 structure, the lithium transition metal composite oxide contains at least one of nickel and cobalt, and manganese, a content of lithium with respect to a transition metal in the lithium transition metal composite oxide exceeds 1.0 in terms of a molar ratio, a diffraction peak is present in a range of 20° or more and 22° or less in an X-ray diffraction diagram of the lithium transition metal composite oxide using a CuKα ray, and the positive active material particles contain aluminum.