Sumitomo Metal Mining Company, Ltd.

University Public Corporation Osaka

Motoaki Saruwatari

Kazuomi Ryoshi

Hiroko Oshita

Koichiro Maki

Shuhei Nakakura

Kazuhiko Tsuchioka

Yoshihiko Nakao

Masafumi Yoshida

Yoshihiro Otsuka

Hideya Nakamura

An object is to provide a positive electrode active material for a non-aqueous electrolyte secondary battery that can suppress gelation of a positive electrode mixture paste and can improve stability when a non-aqueous electrolyte secondary battery is manufactured. A positive electrode active material for a non-aqueous electrolyte secondary battery has a hexagonal layered crystal structure, is represented by general formula (1): LiNiCoMnMBO, and includes a lithium-metal composite oxide containing a secondary particle with a plurality of aggregated primary particles and a lithium-boron compound present on at least a part of surfaces of the primary particles. The amount of lithium hydroxide that elutes when the positive electrode active material is dispersed in water, measured by a neutralization titration method, is 0.01% by mass or more and 0.5% by mass or less with respect to the entire positive electrode active material.

Positive electrode active material for non-aqueous electrolyte secondary battery and method for producing the same, positive electrode mixture paste for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A simulation device for analyzing behavior of a granular material that includes a plurality of particles includes a first parameter acquisition unit that acquires a first parameter including a parameter relating to the granular material, a second parameter calculation unit that calculates a second parameter, when a particle group including the plurality of particles is coarsely viewed as a single coarse-view particle, the second parameter relating to the coarse-view particle, and a coarse-view particle behavior analysis unit that analyzes a behavior of the coarse-view particle based on the first parameter and the second parameter. The second parameter calculation unit calculates the second parameter by solving a characteristic equation that uses a relationship between an elastic energy of the particle group and an elastic energy of the coarse-view particle.

Simulation device, simulation method, and program

The positive electrode active material is for a non-aqueous electrolyte secondary battery, suppressing deterioration of battery characteristics due to exposure to the atmosphere and having excellent battery capacity. A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium-nickel composite oxide represented by general formula (1): LiNiCoMO(in which 0.05≤x≤0.35, 0≤y≤0.10, 0.95≤a≤1.10, 0≤a≤0.2, and M represents at least one element selected from Mn, V, Mg, Mo, Nb, Ti, W, and Al) and LiBO. At least a part of a surface of the lithium-nickel composite oxide is coated with LiBO. The content of boron in the positive electrode active material is 0.001% by mass or more and 0.2% by mass or less with respect to the entire positive electrode active material.

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

A positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium-nickel-cobalt-zinc composite oxide powder that contains lithium (Li); nickel (Ni); cobalt (Co); element M, which is at least one element selected from the group consisting of manganese (Mn), vanadium (V), magnesium (Mg), molybdenum (Mo), niobium (Nb), silicon (Si), titanium (Ti), and aluminum (Al); and zinc (Zn). A molar element ratio (Li:Ni:Co:M) of the lithium-nickel-cobalt-zinc composite oxide powder satisfies Li:Ni:Co:M=z:(1-x-y):x:y (where 0.95&#x2264;z&#x2264;1.10, 0.05&#x2264;x&#x2264;0.35, and 0&#x2264;y&#x2264;0.10); a zinc content with respect to Li, Ni, Co, the element M, and oxygen in the lithium-nickel-cobalt-zinc composite oxide powder is greater than or equal to 0.01 mass % and less than or equal to 1.5 mass %; and at least a part of a surface of the lithium-nickel-cobalt-zinc composite oxide powder includes a zinc solid-solved region where zinc is solid-solved.

Positive electrode active material for nonaqueous electrolyte secondary batteries and method for producing positive electrode active material for nonaqueous electrolyte secondary batteries

A chemical reaction device that supplies a raw material liquid into a solution and causes particles to precipitate in the solution is provided. The chemical reaction device includes an agitation tank configured to accommodate the solution, an impeller configured to agitate the solution, and a plurality of discharge parts configured to discharge the raw material liquid into the solution.

Chemical reaction device and particle production method using chemical reaction device

A method for producing a nickel-containing hydroxide is provided that includes a particle growth step of promoting growth of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the particle growth step, a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 1.7 mol/mis less than 0.624% of the aqueous solution.

Method for producing nickel-containing hydroxide

The present invention has an object to provide a positive electrode active material for a non-aqueous electrolyte secondary battery which not only suppresses gelation of a positive electrode mixed material paste upon producing the non-aqueous electrolyte secondary battery but also improves the stability thereof. Provided is the positive electrode active material represented by general formula LiNiCoMnMO(0&#x2264;x&#x2264;0.35, 0&#x2264;y&#x2264;0.35, 0&#x2264;z&#x2264;0.10, 0.95&#x3c;s&#x3c;1.30, and 0&#x2264;&#x3b1;&#x2264;0.2, and M represents at least one element selected from V, Mg, Mo, Nb, Ti, W, and Al) and containing secondary particles formed by agglomeration of primary particles, wherein at least part of the surface of the primary particles thereof is covered with a lithium boron compound, and the amount of redundant lithium hydroxide of the positive electrode active material measured with a neutralization titration is at least 0.003% by mass and up to 0.5% by mass relative to the total of the positive electrode active material.

Positive electrode active material for non-aqueous electrolyte secondary battery and method for manufacturing the same, positive electrode mixed material paste for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A positive electrode active material for a nonaqueous electrolyte secondary battery contains a first lithium-metal composite oxide represented by General Formula: LiNiCoMnMOand containing a secondary particle formed of a plurality of flocculated primary particles and either one or both of a first compound containing lithium and boron and a second compound containing lithium and tungsten. Either one or both of the following characteristics (1) and (2) are satisfied: (1) the first compound covers surfaces of the primary particles, and a boron content is at least 0.01% by mass and up to 0.5% by mass relative to the entire positive electrode active material; and (2) the second compound covers the surfaces of the primary particles, and a tungsten content is at least 0.01% by mass and up to 1.0% by mass relative to the entire positive electrode active material.

Positive electrode active material for nonaqueous electrolyte secondary battery, method for producing the same, positive electrode mixture paste for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A method for producing a nickel-containing hydroxide is provided that includes a nucleation step of generating nuclei of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the nucleation step, a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 5.0 mol/mis less than 0.100% of the aqueous solution.

A method for producing a nickel-containing hydroxide is provided that includes a particle growth step of promoting growth of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the particle growth step, an averaged value of the maximum accelerations of the flows of streamlines for the aqueous solution is greater than 600 m/s.

Provided is a positive electrode active material for nonaqueous electrolyte secondary batteries that suppresses the gelling of a positive electrode mixture material paste and has high weather resistance, a production method thereof, and the like. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries includes cleaning a powder famed of a lithium-nickel composite oxide represented by a general formula LiNiCoMOwhere 0&#x2264;x&#x2264;0.35; 0&#x2264;y&#x2264;0.10; 0.95&#x2264;z&#x2264;1.10; and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al with an aqueous solution containing one or more lithium salts selected from water-soluble lithium salts other than lithium hydroxide and drying the cleaned powder.

Positive electrode active material for nonaqueous electrolyte secondary batteries, production method thereof, and nonaqueous electrolyte secondary battery

A nickel cobalt manganese composite hydroxide with low impurity content and high reactivity when synthesizing a positive electrode active material, which can be used as a precursor of the positive electrode active material for non-aqueous electrolyte secondary batteries with low irreversible capacity, represented by a general formula: NiCoMnM(OH)(wherein x+y+z+t=1, 0.20&#x2264;x&#x2264;0.80, 0.10&#x2264;y&#x2264;0.50, 0.10&#x2264;z&#x2264;0.90, 0&#x2264;t&#x2264;0.10, 0&#x2264;a&#x2264;0.5, and M is at least one additive element selected from Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, W), which includes: spherical secondary particles formed by aggregation of a plurality of plate-shaped primary particles, which have an average particle diameter of 3 &#x3bc;m to 20 &#x3bc;m, a sulfate radical content of 1.0 mass % or less, a chlorine content of 0.5 mass % or less, and a carbonate radical content of 1.0 mass % to 2.5 mass %.

Growing community of inventors

Niihama, Japan

Motoaki Saruwatari