US 12,002,945 B2 · Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Abstract

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.

Claims6

Dependent claims

A positive electrode active material of a non-aqueous electrolyte secondary battery, comprising a lithium-containing transition metal composite oxide,

wherein the lithium-containing transition metal composite oxide is secondary particles formed by aggregation of primary particles,
when the positive electrode active material is added to an alkaline solution and then distilled, and the distillate is absorbed by sulfuric acid and subjected to ion chromatographic analysis, ammonia is detected in an amount of 2 to 200 ppm relative to the positive electrode active material, and
when a filtrate of an aqueous dispersion prepared by dispersing 1 g of the positive electrode active material in 70 ml of pure water is titrated with hydrochloric acid, and an acid consumption up to a first inflection point of a pH curve is defined as X mol/g and an acid consumption up to a second inflection point is defined as Y mol/g, a value of Y−X is 50 to 300 mol/g and a value of X−(Y−X) is 150 mol/g or less.

Dependencies are inferred from the claim text.

Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Life of this patent

Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Life of this patent

Abstract

Claims6