Abstract: A positive electrode material consists of composite particles. Each of the composite particles includes a base material particle, a film, and a carbon nanotube. The film covers at least a part of a surface of the base material particle. The base material particle includes a positive electrode active material. The film includes a boron oxide. The carbon nanotube includes a first portion and a second portion. The first portion is buried in the film. The second portion is exposed on a surface of the film.

Abstract: A positive electrode disclosed herein includes: a positive electrode active material layer containing a first lithium-transition metal composite oxide in a form of secondary particles and a second lithium-transition metal composite oxide in a form of single particles; and a positive electrode current collector. In the first lithium-transition metal composite oxide, a boron compound is placed on the surfaces of the secondary particles, and a porosity of the secondary particles is 2% to 8%. In the second lithium-transition metal composite oxide, an aluminum compound is placed on the surfaces of the single particles. The first and second lithium-transition metal composite oxides each contain nickel at 70 mol % or more relative to the total amount of transition metal elements, and the mass ratio of the first lithium-transition metal composite oxide:the second lithium-transition metal composite oxide is 80:20 to 50:50.

Abstract: The present disclosure relates to a positive electrode active material comprising a first particle group and a second particle group, wherein the first particle group consists of a plurality of first particles, each first particle includes one to ten single particles, the second particle group consists of a plurality of second particles, each second particle includes an aggregation-based particle, and each aggregation-based particle is formed of 50 or more primary particles aggregated to each other.

Abstract: The present disclosure relates to a positive electrode comprising a positive electrode active material layer and a positive electrode base material, wherein the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a layered metal oxide, the ratio of nickel to the total amount of nickel and a transition metal in the layered metal oxide is 70% or more, and the positive electrode active material present near a surface of the positive electrode active material layer closer to the positive electrode base material has a crystallite diameter that is 200 Å to 500 Å greater than the positive electrode active material present near a surface of the positive electrode active material layer opposite to the positive electrode base material. According to the present disclosure, a positive electrode and a battery each of which is excellent in both endurance and efficiency are provided.

Abstract: The present disclosure relates to a positive electrode active material comprising a single particle and an aggregated particle formed of primary particles aggregated to each other, wherein the single particle includes a boron-containing compound or a tungsten-containing compound in a surface thereof, the single particle has a sphere degree of 0.91 or more, the positive electrode active material has a fluidity index (F. I) of 3.25 or more measured by a powder layer shearing test, and a mass ratio between the single particle and the aggregated particle is from 20:80 to 60:40. According to the present disclosure, a non-aqueous electrolyte secondary battery with reduced gas generation during high-temperature storage is provided.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery according to a configuration includes a lithium-transition metal composite oxide containing nickel (Ni) in an amount of greater than or equal to 80 mol %, in which boron (B) is present at least on a particle surface of the lithium-transition metal composite oxide. In the lithium-transition metal composite oxide, when particles having a larger particle size than a volume-based 70% particle size (D70) are first particles and particles having a smaller particle size than a volume-based 30% particle size (D30) are second particles, a coverage ratio of B on surfaces of the second particle is larger than a coverage ratio of B on surfaces of the first particle by 5% or greater.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery according to a configuration includes a lithium-transition metal composite oxide containing nickel (Ni) in an amount of greater than or equal to 80 mol %, in which boron (B) is present at least on a particle surface of the lithium-transition metal composite oxide. In the lithium-transition metal composite oxide, when particles having a larger particle size than a volume-based 70% particle size (D70) are first particles and particles having a smaller particle size than a volume-based 30% particle size (D30) are second particles, a coverage ratio of B on surfaces of the first particles is larger than a coverage ratio of B on surfaces of the second particles by 5% or greater.

Abstract: An advantage is to provide a non-aqueous electrolyte secondary battery with improved heat resistance. A positive electrode active material contains a lithium-transition metal composite oxide containing 80 mol % or more of Ni and 0.1 mol % to 1.5 mol % of B on the basis of the total number of moles of metal elements excluding Li, and B and at least one element (M1) selected from Groups 4 to 6 are present on at least the surfaces of particles of the composite oxide. When particles having a volume-based particle size larger than 70% particle size (D70) are first particles, and particles having a volume-based particle size smaller than 30% particle size (D30) are second particles, the molar fraction of M1 on the basis of the total number of moles of metallic elements excluding Li on the surfaces of the second particles is greater than that of the first particles.

Abstract: A positive electrode includes a current collector, and an active material layer provided on the current collector. The active material layer has a first layer located on the current collector side and a second layer located on a surface layer side of the active material layer. A proportion of a thickness of the second layer to a total thickness of the first and second layers is from 0.20 to 0.80. When each specific capacity of a potential flat portion near 4.2 V in a charging voltage curve is measured for the first and second layers, the above specific capacity of the second layer is larger than that of the first layer. The above specific capacity of the second layer is greater than 17 mAh/g and at most 30 mAh/g. The above specific capacity of the first layer is from 2 mAh/g to 17 mAh/g.

Abstract: A non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode includes a positive electrode substrate and a positive electrode active material layer. The positive electrode active material layer includes a first layer and a second layer. The second layer is interposed between the positive electrode substrate and the first layer. The first layer includes a first positive electrode active material. The second layer includes a second positive electrode active material. The first positive electrode active material has a first particle size distribution based on volume. The first particle size distribution is unimodal. In the first particle size distribution, a ratio of D10 to D90 is from 0.18 to 0.52. The second positive electrode active material has a second particle size distribution based on volume. The second particle size distribution is multimodal.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a first layer and a second layer. The first layer includes a first particle group. The second layer includes a mixture of a second particle group and a third particle group. The first particle group consists of a plurality of first positive electrode active material particles. The second particle group consists of a plurality of second positive electrode active material particles. The third particle group consists of a plurality of third positive electrode active material particles. Each of the first positive electrode active material particles and the third positive electrode active material particles independently includes 1 to 10 single-particles. Each of the second positive electrode active material particles includes secondary particles obtained by aggregation of 50 or more primary particles.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode; a negative electrode; and an electrolyte. The positive electrode includes a positive electrode substrate and a positive electrode active material layer. The positive electrode active material layer is disposed on a surface of the positive electrode substrate. The positive electrode active material layer includes a first layer and a second layer. The second layer is disposed between the first layer and the positive electrode substrate. The first layer includes single-particles. The second layer includes aggregated particles.

Abstract: A positive electrode active material powder includes a first particle group and a second particle group. The first particle group consists of a plurality of first particles. Each of the first particles includes 1 to 10 single-particles. The second particle group consists of a plurality of second particles. Each of the second particles includes an aggregated particle. The aggregated particle is formed by aggregation of 50 or more primary particles. The positive electrode active material powder has a flow function coefficient of more than or equal to 2.9. The flow function coefficient is a ratio of a maximum principal stress to a uniaxial collapse stress. The uniaxial collapse stress and the maximum principal stress are measured by a direct shear test for powders.

Abstract: Disclosed is a non-aqueous electrolyte secondary battery positive electrode that includes a positive electrode core and a positive electrode mixture layer disposed on the positive electrode core. The positive electrode mixture layer contains a positive electrode active material and carbon nanotubes. The positive electrode active material contains a lithium transition metal composite oxide (I) that either comprises secondary particles that are aggregates of primary particles having an average particle size of 1 ?m or greater, or is substantially composed of single particles, the lithium transition metal composite oxide (I) having a volume-based median diameter of 0.6 ?m to 6 ?m, and a lithium transition metal composite oxide (II) that comprises secondary particles that are aggregates of primary particles having an average particle size of less than 1 ?m, the lithium transition metal composite oxide (II) having a volume-based median diameter of 3 ?m to 25 ?m.

Abstract: A positive electrode material consists of composite particles. Each of the composite particles includes a base material particle, a film, and a carbon nanotube. The film covers at least a part of a surface of the base material particle. The base material particle includes a positive electrode active material. The film includes a boron oxide. The carbon nanotube includes a first portion and a second portion. The first portion is buried in the film. The second portion is exposed on a surface of the film.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery according to a configuration includes a lithium-transition metal composite oxide containing nickel (Ni) in an amount of greater than or equal to 80 mol %, in which boron (B) is present at least on a particle surface of the lithium-transition metal composite oxide. In the lithium-transition metal composite oxide, when particles having a larger particle size than a volume-based 70% particle size (D70) are first particles and particles having a smaller particle size than a volume-based 30% particle size (D30) are second particles, a coverage ratio of B on surfaces of the first particles is larger than a coverage ratio of B on surfaces of the second particles by 5% or greater.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery according to a configuration includes a lithium-transition metal composite oxide containing nickel (Ni) in an amount of greater than or equal to 80 mol %, in which boron (B) is present at least on a particle surface of the lithium-transition metal composite oxide. In the lithium-transition metal composite oxide, when particles having a larger particle size than a volume-based 70% particle size (D70) are first particles and particles having a smaller particle size than a volume-based 30% particle size (D30) are second particles, a coverage ratio of B on surfaces of the second particle is larger than a coverage ratio of B on surfaces of the first particle by 5% or greater.

Abstract: An advantage is to provide a non-aqueous electrolyte secondary battery with improved heat resistance. A positive electrode active material contains a lithium-transition metal composite oxide containing 80 mol % or more of Ni and 0.1 mol % to 1.5 mol % of B on the basis of the total number of moles of metal elements excluding Li, and B and at least one element (M1) selected from Groups 4 to 6 are present on at least the surfaces of particles of the composite oxide. When particles having a volume-based particle size larger than 70% particle size (D70) are first particles, and particles having a volume-based particle size smaller than 30% particle size (D30) are second particles, the molar fraction of M1 on the basis of the total number of moles of metallic elements excluding Li on the surfaces of the second particles is greater than that of the first particles.

Abstract: A non-aqueous electrolyte secondary battery includes at least an electrode composite material layer, an intermediate layer, and an electrode current collector. Intermediate layer is interposed between electrode composite material layer and electrode current collector. Intermediate layer contains at least insulating particles and conductive particles. Each insulating particle has an arc shape in a cross section of intermediate layer along a thickness direction. More conductive particles are present on an outer-circumference side of each arc shape than on an inner-circumference side of the arc shape.

Abstract: A lithium ion secondary battery includes at least a positive electrode, a negative electrode, and an electrolyte. The positive electrode contains at least a first positive electrode active material and a second positive electrode active material. The first positive electrode active material is expressed with a formula (I) LiNiaCobMncO2 and the second positive electrode active material is expressed with a formula (II) LiNidCoeMnfO2, where a, b, c, d, e, and f satisfy conditions of a>d, 0.4?a?0.6, 0.2?b?0.5, 0.1?c?0.2, a+b+c=1.0, 0.2?d?0.5, 0.1?e?0.2, 0.4?f?0.6, and d+e+f=1.