Abstract: The present invention provides a positive electrode active material for lithium secondary batteries including: secondary particles obtained by aggregating primary particles capable of being doped and de-doped with lithium ions, in which the secondary particles have pores, and pore distribution obtained by a mercury intrusion method satisfies requirements (1) and (2) below: (1) pores that are present in any one or both of the secondary particles or spaces between the secondary particles have a pore peak within a range of a pore radius of equal to or greater than 10 nm and equal to or less than 200 nm; and (2) a total surface area of pores that have pore radii of equal to or greater than 100 nm and equal to or less than 10 ?m among the pores that are present in any one or both of the secondary particles or spaces between the secondary particles is less than 1.1 m2/g.

Abstract: The positive electrode active material for secondary batteries having a layered structure containing at least nickel, cobalt, and manganese, as single-crystal particles and/or secondary particles that are aggregates of a plurality of primary particles, wherein: an average particle strength of particles having a particle size of (D50)±1.0 ?m is 200 MPa or more, wherein (D50) is a particle size at a cumulative volume percentage of 50% by volume; and ?/? is set to satisfy 0.97??/??1.25, provided that ? is a full width at half maximum of a lower angle peak among two diffraction peaks appearing in a range of 2?=64.5±1° in an X-ray diffraction pattern, and ? is a full width at half maximum of a higher angle peak among the diffraction peaks.

Abstract: The positive electrode active material particle for a secondary battery, containing a metal and/or a metal compound; and a nickel-containing composite compound, wherein a value of X is 0.00 or more and 0.08 or less. X=(C?A)/B ??(I) wherein A means a molar ratio of an amount of the metal in the metal and/or the metal compound to an amount of metals in the nickel-containing composite compound at a secondary particle diameter D90, B means a molar ratio of an amount of the metal in the metal and/or the metal compound to an amount of the metals in the nickel-containing composite compound at a secondary particle diameter D50, and C means a molar ratio of an amount of the metal in the metal and/or the metal compound to an amount of the metals in the nickel-containing composite compound at a secondary particle diameter D10.

Abstract: A positive electrode active material for a lithium secondary battery, including secondary particles formed by aggregation of primary particles capable of being doped and undoped with lithium ions, said positive electrode active material having: an ?-NaFeO2 type crystal structure represented by formula: Li[Lix(NiaCobMncMd)1-x]O2 (I), wherein 0?x?0.1, 0.7<a<1, 0<b<0.2, 0?c<0.2, 0<d<0.1, a+b+c+d=1, and M is at least one metal element selected from the group consisting of Fe, Cr, Ti, Mg, Al, Zr, Ca, Sc, V, Cr, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In and Sn; and a crystallite size ?/crystallite size ? ratio (?/?) of 1.60 to 2.40, wherein the crystallite size ? is within a peak region of 2?=18.7±1° and the crystallite size ? is within a peak region of 2?=44.4±1°, each determined by a powder X-ray diffraction measurement using Cu-K? radiation.

Abstract: Provided are a method for producing a purified lithium compound excellent in production efficiency of the purified lithium compound, capable of being applied to various types of lithium compounds, and capable of reducing energy consumption in obtaining the purified lithium compound and a method for producing a lithium transition metal composite oxide using the purified lithium compound obtained by said production method. A method for producing a purified lithium compound includes a crushing step of disaggregating aggregation of a crude lithium compound containing a magnetic substance and a magnetic separation treatment step of conducting magnetic separation in a dry manner on the crushed crude lithium compound using a magnetic separator to remove the magnetic substance from the crushed crude lithium compound.

Abstract: A positive electrode active material for lithium secondary batteries, includes: a lithium composite metal compound containing secondary particles formed by aggregation of primary particles; and a lithium-containing tungsten oxide, in which the lithium-containing tungsten oxide is present at least in interparticle spaces of the primary particles, and in a pore distribution of the positive electrode active material for lithium secondary batteries measured by a mercury intrusion method, a surface area of pores having a pore diameter in a range of 10 nm or more to 200 nm or less is 0.4 m2/g or more and 3.0 m2/g or less.

Abstract: A positive electrode active material includes a composite particle. The composite particle includes a core particle and a covering layer. The core particle includes a nickel composite hydroxide. The nickel composite hydroxide is represented by the following formula: Nix1Zn1-x1-y1Coy1(OH)2 (where x1 and y1 satisfy 0.90?x1<1.00, 0?y1?0.01, and 0<(1?x1?y1)). The covering layer covers at least a part of a surface of the core particle. The covering layer includes a cobalt compound. In an X-ray absorption fine structure obtainable through measurement by a total electron yield method with soft X-ray, cobalt L3 absorption edge has a peak top in a range not less than 780.5 eV.

Abstract: A positive electrode active material for a lithium secondary battery, which includes a lithium-containing composite metal compound in the form of secondary particles that are aggregates of primary particles capable of being doped and undoped with lithium ions, each of the secondary particles having on its surface a coating layer including a metal composite oxide including lithium and aluminum, wherein the positive electrode active material includes at least nickel and aluminum as non-lithium metals, and satisfies all of the requirements (1) to (2).

Abstract: The object of the present invention is to provide a positive electrode active material usable for a lithium ion battery capable of high charge/discharge cycle performance and high discharge capacity. The positive electrode active material for a lithium secondary battery has a layered structure and comprises at least nickel, cobalt and manganese. Further, the positive electrode active material satisfies requirements (1) to (3) below: (1) a primary particle size of 0.1 ?m to 1 ?m, and a 50% cumulative particle size D50 of 1 ?m to 10 ?m, (2) a ratio (D90/D10) of volume-based 90% cumulative particle size D50 to volume-based 10% cumulative particle size D10 of 2 to 6, and (3) a lithium carbonate content in a residual alkali on particle surfaces of 0.1% by mass to 0.8% by mass as measured by neutralization titration.

Abstract: A positive-electrode active material for a lithium secondary battery includes: a secondary particle in which a plurality of primary particles of a lithium composite metal oxide are aggregated, in which the secondary particle has a void formed therein, and a through-hole that connects the void to a surface of the secondary particle, and satisfies predetermined requirements (i) to (iii).

Abstract: There is provided a lithium-iron-manganese-based composite oxide capable of providing a lithium-ion secondary battery which has a high capacity retention rate in charge/discharge cycles and in which the generation of a gas caused by charge/discharge cycles is suppressed. A lithium-iron-manganese-based composite oxide having a layered rock-salt structure, wherein at least a part of the surface of a lithium-iron-manganese-based composite oxide represented by the following formula is coated with an oxide of at least one metal selected from the group consisting of La, Pr, Nd, Sm and Eu: LixM1(y-p)MnpM2(z-q)FeqO(2-?) wherein 1.05?x?1.32, 0.33?y?0.63, 0.06?z?0.50, 0<p?0.63, 0.06?q?0.50, 0???0.80, y?p, and z?q; M1 is at least one element selected from Ti and Zr; and M2 is at least one element selected from the group consisting of Co, Ni and Mn.

Abstract: A positive electrode active material for a lithium secondary cell, having a layered structure and comprising at least nickel, cobalt and manganese, the positive electrode active material satisfying requirements (1), (2) and (3) below: (1) a composition represented by a composition formula: Li[Lix(Ni?Co?Mn?M?)1-x]O2, wherein 0?x?0.10, 0.30<??0.34, 0.30<??0.34, 0.32??<0.40, 0???0.10, ?<?, ?+?+?+?=1, M represents at least one metal selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, Zn, Sn, Zr, Ga and V; (2) a secondary particle diameter of 2 ?m or more and 10 ?m or less; and (3) a maximum peak value in a pore diameter range of 90 nm to 150 nm in a pore diameter distribution determined by mercury porosimetry.

Abstract: A positive electrode active material for an alkaline storage battery having excellent over-discharge tolerance and high-temperature tolerance, and a method for producing the positive electrode active material. A positive electrode active material for an alkaline storage battery, containing a hydroxide particle containing at least nickel and solid-solubilized cobalt, and a covering layer containing cobalt, the covering layer covering the hydroxide particle, in which cobalt contained in the covering layer and cobalt contained in the hydroxide particle each have a diffraction peak between diffraction angles of 65° and 66°, the diffraction angles each represented by 2? in a diffraction pattern obtained by X-ray diffraction measurement.

Abstract: To provide a positive electrode active material for an alkaline storage battery having an excellent utilization factor even under a high-temperature condition. A positive electrode active material for an alkaline storage battery, having a hydroxide particle containing nickel, the hydroxide particle containing solid-solubilized cobalt, and a covering layer containing cobalt, the covering layer covering the hydroxide particle, in which the positive electrode active material has a diffraction peak between diffraction angles of 65° and 66°, the diffraction angles represented by 2? in a diffraction pattern obtained by X-ray diffraction measurement, a content by percentage of trivalent cobalt in the solid-solubilized cobalt is 30% by mass or more, a ratio of a content by percentage of the solid-solubilized trivalent cobalt in positive electrode active material particles for an alkaline storage battery, the particles having a secondary particle diameter (?D10) where a cumulative volume percentage is 10.

Abstract: An objective of the present invention is to provide a positive electrode active material that can inhibit the capacity changes associated with temperature variations, and an alkaline battery that contains this positive electrode active material. Aluminum and ytterbium are at least partially solid-dissolved in nickel hydroxide in the nickel composite hydroxide present in the positive electrode active material of the present invention.

Abstract: A positive electrode active material, which has a crystallite size ?/crystallite size ? ratio (?/?) of 1 to 1.75 or less, wherein the crystallite size ? is within a peak region of 2?=18.7±1° and the crystallite size ? is within a peak region of 2?=44.6±1°, each determined by a powder X-ray diffraction measurement using Cu-K? ray, and has a composition represented by formula (I) below: Li[Lix(NiaCobMncMd)1-x]O2??(I) wherein 0?x?0.2, 0.3<a<0.7, 0<b<0.4, 0<c<0.4, 0?d<0.1, a+b+c+d=1, and M is at least one metal selected from the group consisting of Fe, Cr, Ti, Mg, Al and Zr.

Abstract: A lithium metal composite oxide powder includes primary particles; and secondary particles formed by aggregation of the primary particles, in which the lithium metal composite oxide powder is represented by Composition Formula (1), and the lithium metal composite oxide powder satisfies all of requirements (A), (B), and (C).

Abstract: Provided is a positive electrode active material which is useful for a lithium secondary battery having a battery resistance lower than that of the conventional positive electrode active material below freezing point. The positive electrode active material for a lithium secondary battery contains at least one element selected from a group consisting of nickel, cobalt and manganese, the positive electrode active material having a layered structure and satisfying all of the following requirements (1) to (3): (1) a primary particle size is 0.1 ?m to 1 ?m and a secondary particle size is 1 ?m to 10 ?m; (2) in an X-ray powder diffraction measurement using CuK? radiation, a crystallite size in the peak within 2?=18.7±1° is 100 ? to 1200 ? and a crystallite size in the peak within 2?=44.6±1° is 100 ? to 700 ?; and (3) in a pore distribution obtained by a mercury intrusion method, a pore peak exists in a range where the pore size is 10 nm to 200 nm and a pore volume in the said range is 0.01 cm3/g to 0.05 cm3/g.

Abstract: An objective of the present invention is to provide a positive electrode active material that can inhibit the capacity changes associated with temperature variations, and an alkaline battery that contains this positive electrode active material. Aluminum and ytterbium are at least partially solid-dissolved in nickel hydroxide in the nickel composite hydroxide present in the positive electrode active material of the present invention.

Abstract: There is provided a lithium-iron-manganese-based composite oxide capable of providing a lithium-ion secondary battery which has a high capacity retention rate in charge/discharge cycles and in which the generation of a gas caused by charge/discharge cycles is reduced. A lithium-iron-manganese-based composite oxide having a layered rock-salt structure, wherein at least a part of the surface of a lithium-iron-manganese-based composite oxide represented by the following formula (1) is coated with an inorganic material: LixM1(y-p)MnpM2(z-p)FeqO(2-?) (1) (wherein 1.05?x?1.32, 0.33?y?0.63, 0.06?z?0.50, 0<p?0.63, 0.06?q?0.50, 0???0.80, y?p, and z?q; M1 is at least one element selected from Ti and Zr; and M2 is at least one element selected from the group consisting of Co, Ni and Mn).