Abstract: A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, includes: a mixing step of adding a W compound powder having a solubility A adjusted to 2.0 g/L or less to a Li-metal composite oxide powder and stirring in water washing of the composite oxide powder, the solubility A being determined by stirring the W compound in water having a pH of 12.5 at 25° C. for 20 minutes, the composite oxide powder being represented by the formula: LicNi1-x-yCoxMyO2 and composed of primary and secondary particles, followed by solid-liquid separation, to thereby obtain a tungsten-containing mixture with the tungsten compound dispersed in the composite oxide powder; and a heat-treating step of heat-treating the mixture to uniformly disperse W on the surface of primary particles and thereby form a compound containing W and Li from the W and Li in the mixture, on the surface of primary particles.

Abstract: Provided is a method for producing the positive electrode active material for nonaqueous electrolyte secondary batteries, including a first step of mixing a Li-metal composite oxide powder which is represented by the general formula: LizNi1-x-yCoxMyO2 (where 0?x?0.35, 0·y?0.35, and 0.97?z?1.30 are satisfied, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti and Al) and constituted by primary particles and secondary particles, to an alkaline solution with a W compound dissolved therein, and immersing a resulting mixture, followed by solid-liquid separation, to obtain a W mixture with W uniformly dispersed on the surface of the primary particles of the composite oxide, and a second step of heat-treating the W mixture to thereby form a compound containing W and Li on the surface of the primary particles of the composite oxide powder.

Abstract: A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, includes: a mixing step of adding a W compound powder having a solubility A adjusted to 2.0 g/L or less to a Li-metal composite oxide powder and stirring in water washing of the composite oxide powder, the solubility A being determined by stirring the W compound in water having a pH of 12.5 at 25° C. for 20 minutes, the composite oxide powder being represented by the formula: LicNi1-x-yCoxMyO2 and composed of primary and secondary particles, followed by solid-liquid separation, to thereby obtain a tungsten-containing mixture with the tungsten compound dispersed in the composite oxide powder; and a heat-treating step of heat-treating the mixture to uniformly disperse W on the surface of primary particles and thereby form a compound containing W and Li from the W and Li in the mixture, on the surface of primary particles.

Abstract: Provided is a method for producing the positive electrode active material for nonaqueous electrolyte secondary batteries, including a first step of mixing a Li-metal composite oxide powder which is represented by the general formula: LizNi1-x-yCoxMyO2 (where 0?x?0.35, 0?y?0.35, and 0.97?z?1.30 are satisfied, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti and Al) and constituted by primary particles and secondary particles, to an alkaline solution with a W compound dissolved therein, and immersing a resulting mixture, followed by solid-liquid separation, to obtain a W mixture with W uniformly dispersed on the surface of the primary particles of the composite oxide, and a second step of heat-treating the W mixture to thereby form a compound containing W and Li on the surface of the primary particles of the composite oxide powder.

Abstract: Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, the method including: a mixing step of obtaining a W-containing mixture of Li-metal composite oxide particles represented by the formula: LizNi1-x-yCoxMyO2 and composed of primary particles and secondary particles formed by aggregation of the primary particles, 2 mass % or more of water with respect to the oxide particles, and a W compound or a W compound and a Li compound, the W-containing mixture having a molar ratio of the total amount of Li contained in the water and the solid W compound, or the W compound and the Li compound of 1.5 or more and less than 3.0 with respect to the amount of W contained therein; and a heat treatment step of heating the W-containing mixture to form lithium tungstate on the surface of the primary particles.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium metal composite oxide, wherein the lithium metal composite oxide is represented by a general formula: LiaNi1?x?y?zCoxDyEzO2 (wherein, in the formula, 0.05?x?0.35, 0?y?0.35, 0.002?z?0.05, 1.00?a?1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced), wherein the lithium metal composite oxide includes primary and secondary particles formed by aggregating the primary particles, wherein an oxide containing the element E exists at a surface of at least either of the primary and secondary particles.

Abstract: Provided is a positive electrode active material that is capable of simultaneously improving the battery capacity, output characteristics and cycling characteristics of a secondary battery. When obtaining a transition metal-containing composite hydroxide that is a precursor to the positive electrode active material, by adjusting the pH value of a reaction aqueous solution to be within the range 12.0 to 14.0 and performing generation of nuclei (nucleation), and then adjusting the pH value of the reaction aqueous solution to be within the range 10.5 to 12.

Abstract: Provided is a positive electrode active material that has high output characteristics and battery capacity when used for a positive electrode of a nonaqueous electrolyte secondary battery and can inhibit gelation of positive electrode mixture paste. A method for producing the positive electrode active material is also provided. A positive electrode active material for a nonaqueous electrolyte secondary battery contains a lithium-nickel-cobalt-manganese composite oxide represented by General Formula (1): Lii+sNixCoyMnzBLM1uO2+? and having a hexagonal layered crystal structure. The lithium-nickel-cobalt-manganese composite oxide contains a secondary particle formed of a plurality of flocculated primary particles and a boron compound containing lithium present at least on part of surfaces of the primary particles. A water-soluble Li amount present on the surfaces of the primary particles is up to 0.1% by mass relative to the entire amount of the positive electrode active material.

Abstract: Provided is a positive electrode active material for a nonaqueous electrolyte secondary battery including a LiNi composite oxide having low internal resistance and excellent thermal stability. The positive electrode active material is obtained by performing a water washing process using a water spray on a LiNi composite oxide powder obtained by a firing step until the filtrate has an electric conductivity of 30 to 60 mS/cm, and then dried, where the LiNi composite oxide is represented by the composition formula (1): LibNi1?aM1aO2, where M1 represents at least one kind of element selected from transition metal elements other than Ni, group 2 elements, and group 13 elements, and 0.01?a?0.5, and 0.85?b?1.05.

Abstract: Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, including: a water-washing step of mixing, with water, Li—Ni composite oxide particles represented by the formula: LizNi1?x?yCoxMyO2 and composed of primary particles and secondary particles formed by aggregation of the primary particles to water-wash it, and performing solid-liquid separation to obtain a washed cake; a mixing step of mixing a W compound powder free from Li with the washed cake to obtain a W-containing mixture; and a heat treatment step of heating the W-containing mixture, the heat treatment step including: a first heat treatment step of heating the W-containing mixture to disperse W on the surface of the primary particles; and subsequently, a second heat treatment step of heating it at a higher temperature than in the first heat treatment step to form a lithium tungstate compound on the surface of the primary particles.

Abstract: The presently disclosed subject matter is directed to transition metal-containing composite hydroxides, their use, and manufacturing methods thereof. More particularly, the subject matter describes a positive electrode active material for a non-aqueous electrolyte secondary battery that uses a transition metal-containing composite hydroxide as a precursor and a manufacturing method thereof. In some embodiments, the non-aqueous electrolyte secondary battery uses a positive electrode active material for a non-aqueous electrolyte secondary battery as a positive electrode material.

Abstract: A positive electrode active material and its precursor capable of further improving output characteristics while maintaining capacity characteristics and cycle characteristics of a positive electrode active material having the solid structure is provided.

Abstract: A transition metal-containing composite hydroxide comprises secondary particles having: a center portion of fine primary particles; and an outer-shell portion having a high-density layer of plate-shaped primary particles formed outside the center portion, a low-density layer of the fine primary particles formed outside the high-density layer, and an outer-shell layer of the plate-shaped primary particles formed outside the low-density layer. The composite hydroxide is obtained by a method comprising a nucleation step in an oxidizing atmosphere and a particle growth step, the particle growth step comprising: a first stage of maintaining the oxidizing atmosphere; a second stage of switching to and maintaining a non-oxidizing atmosphere; a third stage of switching again to and maintaining the oxidizing atmosphere; and a fourth stage of switching again to and maintaining the non-oxidizing atmosphere.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery that can improve the output characteristics without deteriorating its battery capacity and cycling characteristics. The positive electrode active material comprises a lithium transition metal-containing composite oxide comprising secondary particles that are constructed by an aggregation of a plurality of primary particles. The secondary particles comprise an outer shell section where the primary particles are aggregated, a center section constructed by an inner space existing inside the outer shell section, and at least one through-hole formed in the outer shell section and communicating the center section and outside, and the ratio of the inner diameter of the through-hole with respect to the thickness of the outer shell section is 0.3 or more.

Abstract: Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, including: a water-washing step of mixing, with water, Li—Ni composite oxide particles represented by the formula: LizNi1-x-yCoxMyO2 and composed of primary particles and secondary particles formed by aggregation of the primary particles to water-wash it, and performing solid-liquid separation to obtain a washed cake; a mixing step of mixing a W compound powder free from Li with the washed cake to obtain a W-containing mixture; and a heat treatment step of heating the W-containing mixture, the heat treatment step including: a first heat treatment step of heating the W-containing mixture to disperse W on the surface of the primary particles; and subsequently, a second heat treatment step of heating it at a higher temperature than in the first heat treatment step to form a lithium tungstate compound on the surface of the primary particles.

Abstract: Provided is a positive electrode active material that can be used to fabricate a nonaqueous electrolyte secondary battery having excellent output characteristics not only in an environment at normal temperature but also in all temperature environments from extremely low to high temperatures. A positive electrode active material for nonaqueous electrolyte secondary batteries, the positive electrode active material includes a boron compound and lithium-nickel-cobalt-manganese composite oxide of general formula (1) having a layered hexagonal crystal structure. The lithium-nickel-cobalt-manganese composite oxide includes secondary particles composed of agglomerated primary particles. The boron compound is present on at least part of the surface of the primary particles, and contains lithium.

Abstract: The present invention has an object to provide a positive electrode active material for a non-aqueous electrolyte secondary battery which can improve stability of a positive electrode mixed material paste when manufacturing the secondary battery and can increase the battery capacity and improve output characteristic of the secondary battery. A method for manufacturing a positive electrode active material for a non-aqueous electrolyte secondary battery includes mixing fired powder containing lithium-metal composite oxide having a crystal structure of a layered structure with water, and drying this mixture. The fired powder includes secondary particles formed by agglomeration of primary particles. Water is mixed thereto with an amount with which pH of a supernatant obtained after 5 g of the positive electrode active material is dispersed into 100 mL of pure water followed by statically leaving the dispersion solution for 10 minutes falls within a range of 11 to 11.9 at 25° C.

Abstract: A positive electrode active material for nonaqueous electrolyte secondary batteries and production method thereof that are able to improve the stability of positive electrode mixture material pastes used to produce nonaqueous electrolyte secondary batteries, as well as to improve the output characteristics and charge/discharge cycle characteristics of secondary batteries. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries includes mixing a fired powder formed of a lithium-metal composite oxide having a layered crystal structure, a first compound which is at least one selected from a group consisting of a lithium-free oxide, a hydrate of the oxide, and a lithium-free inorganic acid salt, and water and drying a mixture resulting from the mixing. The fired powder includes secondary particles formed by agglomeration of primary particles. The first compound reacts with lithium ions in the presence of water to form a second compound including lithium.

Abstract: A positive electrode active material for nonaqueous electrolyte secondary batteries has a high charge/discharge capacity and produces high output, as well as has high filling ability. The positive electrode active material includes lithium-nickel composite oxide particles are formed by agglomeration of multiple primary particles, include pores, and have a layered crystal structure. The lithium-nickel composite oxide particles have an average particle size of 15 ?m or more and 30 ?m or less. The percentage of an area of the pores measured by a cross-sectional observation of the lithium-nickel composite oxide particles with respect to a cross-sectional area of the lithium-nickel composite oxide particles is 1.0% or more and 5.0% or less. A lithium-tungsten compound containing tungsten and lithium is present on the surface of and inside the secondary particles. The lithium-tungsten compound is present on at least part of the surface of the primary particles.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery, including primary particles of a lithium nickel composite oxide represented by the formula: LibNi1-x-yCoxMyO2 wherein M represents at least one element selected from Mg, Al, Ca, Ti, V, Cr, Mn, Nb, Zr and Mo; b represents a number satisfying 0.95?b?1.03; and x represents a number satisfying 0<x?0.15 and y represents a number satisfying 0<y?0.07, wherein the sum total of x and y is 0.16 or smaller, i.e., x+y?0.16) and secondary particles that are aggregates of the primary particles, wherein microparticles containing W and Li are present on the surface of each of the primary particles, and the length of axis-c of the lithium nickel composite oxide is 14.183 angstroms or more as determined by a Rietveld analysis of X-ray diffraction data on the oxide.