Abstract: A non-aqueous electrolyte secondary battery that is one aspect of the present disclosure is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte, the positive electrode having a positive electrode current collector and a positive electrode mixture layer that contains a positive electrode active material and that is formed on the surface of the positive electrode current collector, the positive electrode active material including a lithium-containing composite oxide represented by a prescribed general formula, the lithium-containing composite oxide having secondary particles formed by aggregation of primary particles, Ca being present on the surfaces and in the interiors of the secondary particles, and the proportion of Ca present on the surfaces of the secondary particles being 12-58% relative to the total amount of Ca present on the surfaces and in the interiors of the secondary particles.

Abstract: A non-aqueous electrolyte secondary battery that is one aspect of the present disclosure is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte, the positive electrode having a positive electrode current collector and a positive electrode mixture layer that contains a positive electrode active material and that is formed on the surface of the positive electrode current collector, the positive electrode active material including a lithium-containing composite oxide represented by a prescribed general formula, the lithium-containing composite oxide having secondary particles formed by aggregation of primary particles, Ca being present on the surfaces and in the interiors of the secondary particles, and the proportion of Ca present on the surfaces of the secondary particles being 12-58% relative to the total amount of Ca present on the surfaces and in the interiors of the secondary particles.

Abstract: An object of the present disclosure is to provide a nonaqueous electrolyte secondary battery that can suppress lowering in capacity due to high-temperature storage of the battery. The nonaqueous electrolyte secondary battery (10) includes: a positive electrode (11) containing one or more positive electrode active materials; a negative electrode (12); and a nonaqueous electrolyte containing a fluorine compound, where: the positive electrode active materials include a complex oxide A containing Li, Ni, and W and a complex oxide B containing Li, Ni, and W as an optional element; W content in the complex oxide A is 5 mol % or more; W content in the complex oxide B is 0.5 mol % or less; and a mass ratio of the complex oxide A is 0.002% or more and 0.1% or less relative to the total of the complex oxide A and the complex oxide B.

Abstract: A positive electrode active material for nonaqueous electrolyte secondary batteries according to one embodiment of the present disclosure contains a lithium transition metal composite oxide which is represented by general formula LiaNibCocAldXeOf (wherein 0.9?a?1.2; 0.88?b?0.96; 0?c?0.12; 0?d?0.12; 0?e?0.1; 1.9?f?2.1; (b+c+d)=1; and X represents at least one element that is selected from among Mn, Mg, Ca, Sr, Ba, Ti, Zr, V, Nb, Ta, Mo, W and B); and the lithium transition metal composite oxide has a pore volume of pores having a pore diameter of 0.3 ?m or less of from 6×10?4 mL/g to 50×10?4 mL/g, while having a particle fracture strength of 120 MPa or more at the volume average particle diameter.

Abstract: This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35 r of the center.

Abstract: This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35r of the center.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery according to an aspect of the present disclosure contains a lithium metal composite oxide having secondary particles formed by the aggregation of primary particles, wherein W is present on the surface and inside of the secondary particles of the lithium metal composite oxide. The amount of W present on the surface of the secondary particles of the lithium metal composite oxide represented by general formula Li?NiaCobAlcMdWeO? (in the formula, 0.9???1.2, 0.8?a?0.96, 0<b?0.10, 0<c?0.10, 0?d?0.1, 0.0003?e/(a+b+c+d+e)?0.002, 1.9???2.1, a+b+c+d=1, and M is at least one element selected from among Mn, Fe, Ti, Si, Nb, Zr, Mo, and Zn) is 25-45% of the total amount of W present on the surface and inside of the secondary particles of the lithium metal composite oxide.

Abstract: A positive electrode for a non-aqueous electrolyte secondary battery contains a first particle and a second particle. The first particle contains an electrochemically active positive-electrode active material, and the positive-electrode active material contains a lithium transition metal oxide. The second particle contains an electrochemically inactive metal oxide. An electrochemically inactive phosphate adheres to the surface of the second particle.

Abstract: In a non-aqueous electrolyte secondary battery that is one example of the embodiment, a positive electrode mix layer comprises a positive electrode active material comprising a lithium transition metal composite oxide represented by general formula: LiaNibCo(1-b-c)AlcOd (0.9<a?1.2, 0.88?b?0.96, 0.04?c?0.12, 1.9?d?2.1) and lithium carbonate in an amount of 0.1 to 1.0% by mass relative to the mass of the positive electrode active material. The lithium transition metal composite oxide has the form of secondary particles formed by the aggregation of primary particles, wherein tungsten is present, on the surface of each of the primary particles, in an amount of 0.05 to 0.20 mol % relative to the total molar amount of non-Li-metal elements contained in the positive electrode active material.

Abstract: A non-aqueous electrolyte secondary battery according to one mode of the present disclosure is provided with: a positive electrode including a positive-electrode active material layer; a negative electrode; and a non-aqueous electrolyte, wherein the positive-electrode active material layer includes positive-electrode active material particles having a particle size distribution in which the difference (D90-D10) between a 90% diameter (D90) and a 10% diameter (D10) measured with a laser diffraction method is larger than 13 ?m. In addition, the positive-electrode active material layer is characterized in that, on an arbitrarily defined cross section thereof, the total area of positive-electrode active material particles A, each of which has a particle size not smaller than 15 ?m and has a particle area at least 0.8-fold the area of a circle circumscribing the positive-electrode active material particle, is 20% or larger with respect to the total area of the cross section.

Abstract: An object of the present disclosure is to provide a nonaqueous electrolyte secondary battery that can suppress lowering in capacity due to high-temperature storage of the battery. The nonaqueous electrolyte secondary battery (10) includes: a positive electrode (11) containing one or more positive electrode active materials; a negative electrode (12); and a nonaqueous electrolyte containing a fluorine compound, where: the positive electrode active materials include a complex oxide A containing Li, Ni, and W and a complex oxide B containing Li, Ni, and W as an optional element; W content in the complex oxide A is 5 mol % or more; W content in the complex oxide B is 0.5 mol % or less; and a mass ratio of the complex oxide A is 0.002% or more and 0.1% or less relative to the total of the complex oxide A and the complex oxide B.

Abstract: This positive electrode active material for non-aqueous electrolyte secondary batteries comprises: lithium transition metal oxide particles; a metal compound which contains a metal element M and adheres to the surfaces of the lithium transition metal oxide particles; and a lithium metal compound which contains lithium (Li) and the metal element M and adheres to the surfaces of the lithium transition metal oxide particles. In this connection, the metal element M is composed of at least one substance that is selected from among aluminum (Al), titanium (Ti), manganese (Mn), gallium (Ga), molybdenum (Mo), tin (Sn), tungsten (W) and bismuth (Bi).

Abstract: A positive electrode active material for nonaqueous electrolyte secondary batteries, which has high energy density and excellent cycle characteristics. A positive electrode active material for nonaqueous electrolyte secondary batteries of the present invention is represented by general formula LiNixCoyM(1-x-y)O2 (wherein M represents at least one element selected from among metal elements, 0.3?x<1.0 and 0<y?0.5) and is configured of particles, each of which is an aggregate of crystallites. Each particle has a compressive breaking strength of from 200 MPa to 500 MPa (inclusive), and the crystallite diameter in the vector direction of the particle is from 100 nm to 300 nm (inclusive).

Abstract: A positive electrode for a non-aqueous electrolyte secondary battery contains a first particle and a second particle. The first particle is an electrochemically active positive-electrode active material, and the positive-electrode active material contains a lithium transition metal oxide. The second particle is an electrochemically inactive metal oxide and has a BET specific surface area in the range of 10 to 100 m2/g and a sphericity of 0.8 or more.

Abstract: This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35 r of the center.

Abstract: A positive electrode for a non-aqueous electrolyte secondary battery contains a first particle and a second particle. The first particle contains an electrochemically active positive-electrode active material, and the positive-electrode active material contains a lithium transition metal oxide. The second particle contains an electrochemically inactive metal oxide. An electrochemically inactive phosphate adheres to the surface of the second particle.

Abstract: A nonaqueous electrolyte secondary battery has both high capacity and high regeneration. A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains a Ni-containing lithium transition metal oxide having a layered structure and also contains a tungsten compound and/or a molybdenum compound. The percentage of Ni is greater than 90 mole percent with respect to the molar amount of the lithium transition metal oxide. The amount of the compound is 0.1 mole percent to 1.5 mole percent with respect to the molar amount of the lithium transition metal oxide in terms of tungsten element and/or molybdenum element.

Abstract: A non-aqueous electrolyte secondary battery according to one mode of the present disclosure is provided with: a positive electrode including a positive-electrode active material layer; a negative electrode; and a non-aqueous electrolyte, wherein the positive-electrode active material layer includes positive-electrode active material particles having a particle size distribution in which the difference (D90-D10) between a 90% diameter (D90) and a 10% diameter (D10) measured with a laser diffraction method is larger than 13 ?m. In addition, the positive-electrode active material layer is characterized in that, on an arbitrarily defined cross section thereof, the total area of positive-electrode active material particles A, each of which has a particle size not smaller than 15 ?m and has a particle area at least 0.8-fold the area of a circle circumscribing the positive-electrode active material particle, is 20% or larger with respect to the total area of the cross section.

Abstract: The invention provides nonaqueous electrolyte secondary batteries having excellent output characteristics during large-current charging and discharging. A nonaqueous electrolyte secondary battery according to one aspect of the invention includes a positive electrode including a lithium transition metal oxide, a negative electrode including a negative electrode active material capable of storing and releasing lithium ions, and a nonaqueous electrolyte, the negative electrode active material including a carbon material as a main component, the negative electrode including a tungsten compound and/or a molybdenum compound. The tungsten compound and/or the molybdenum compound is preferably attached to the surface of the carbon material.

Abstract: In a nonaqueous electrolyte secondary battery which includes an electrode assembly that includes a positive electrode including a positive electrode current collector and a positive electrode mixture layer, a negative electrode including a negative electrode current collector and a negative electrode mixture layer, and a separator, the positive electrode mixture layer contains Ni in a proportion of not less than 85 mol % relative to the total molar amount of metal element(s) except lithium, and includes a lithium transition metal oxide bearing on the surface thereof an attached element belonging to Group VI of the periodic table. The negative electrode mixture layer includes a carbon material and a silicon compound. The surface pressure present on a plane in which the positive electrode and the negative electrode are opposed to each other through the separator is not less than 0.1 MPa/cm2.