Sumitomo Metal Mining Company, Ltd.

Panasonic Energy Co., Ltd.

Jun Suzuki

Koji Yamaji

Tetsufumi Komukai

Haruki Kaneda

Yuki Furuichi

Takaaki Ando

A method of manufacturing a positive electrode active material for a lithium ion secondary battery includes a mixing step of mixing a lithium-nickel composite oxide which is a starting material with a tungsten compound powder without lithium, while being heated, to prepare a tungsten mixture, and a heat treatment step of heat-treating the tungsten mixture. The lithium-nickel composite oxide contains lithium (Li), nickel (Ni), and an element M (M), wherein, the element M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, Co, and Al, wherein, in the starting material, a ratio of number of tungsten atoms to a total number of nickel atom and the element M atoms contained in the lithium-nickel composite oxide is 0.05 at. % or more and 3.00 at. % or less.

Method of manufacturing positive electrode active material for lithium ion secondary battery, positive electrode active material for lithium ion secondary battery, and lithium ion secondary battery

A method for producing a positive electrode active material for a lithium ion secondary battery containing lithium-nickel composite oxide, includes: mixing a nickel compound, a lithium compound, and organic compound particles to obtain a lithium mixture; molding the lithium mixture to obtain a molded body; firing the molded body to obtain a fired body; and crushing the fired body to obtain lithium-nickel composite oxide powder.

Method for producing positive electrode active material for lithium ion secondary battery, and molded body

A positive electrode active material containing a lithium metal composite oxide composed of secondary particles formed by aggregated primary particles, comprising lithium, at least one metal element and at least one additive element, the lithium metal composite oxide having a crystal structure of layered rock salt structure and the metal element including nickel in a content of 60 to 90 atomic percent and the additive element including boron in content of more than 1.0 atomic percent and 6.0 atomic percent or less, the nickel content and the boron content each with respect to the sum of the metal element and the additive element, the porosity of the secondary particles being 8% or more and 20% or less; a non-aqueous electrolyte secondary battery containing the positive electrode active material; and a process for producing the positive electrode active material.

Positive electrode active material for non-aqueous electrolyte secondary battery and process for producing same, and non-aqueous electrolyte secondary battery

Provided are a positive electrode active material with which a secondary battery having high charging and discharging capacities and an excellent cycle characteristic can be obtained, and a method for producing the same. A positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium-metal composite oxide represented by a general formula: LiNiCoMnMOand containing a secondary particle formed of a plurality of flocculated primary particles. A void ratio obtained from an image analysis result of a cross section of the secondary particle, the image thereof being obtained by a scanning electron microscope, is at least 5% and up to 50% in a first area that is from a central part of the secondary particle to one half of a radius of the secondary particle, and is up to 1.5% in a second area that is outside the first area.

Positive electrode active material for nonaqueous electrolyte secondary battery, method for producing same, and nonaqueous electrolyte secondary battery

Provided is a positive electrode active material for nonaqueous electrolyte secondary batteries that is represented by the general formula (1): LiNiCoMWO(where 0&#x2264;x&#x2264;0.35, 0&#x2264;y&#x2264;0.35, 0.0008&#x2264;z&#x2264;0.030, 0.97&#x2264;a&#x2264;1.25, and 0&#x2264;&#x3b1;&#x2264;0.20, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al) and is constituted by a Li-metal composite oxide composed of primary particles and secondary particles formed by aggregation of the primary particles, wherein a compound including Li and W is formed on the surface of the primary particles of the composite oxide and the amount of W contained in the compound is such that the number of atoms of W is 0.08 to 0.30 at % with respect to the total number of atoms of Ni, Co, and M contained in the positive electrode active material.

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Niihama, Japan

Jun Suzuki