Sumitomo Metal Mining Company, Ltd.

Panasonic Energy Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Shuhei Oda

Hiroyuki Toya

Katsuya Inoue

Atsushi Fukui

Satoshi Matsumoto

Tetsutaro Hayashi

Hideyuki Saka

Provided are a cathode active material having a suitable particle size and high uniformity, and a nickel composite hydroxide as a precursor of the cathode active material. When obtaining nickel composite hydroxide by a crystallization reaction, nucleation is performed by controlling a nucleation aqueous solution that includes a metal compound, which includes nickel, and an ammonium ion donor so that the pH value at a standard solution temperature of 25° C. becomes 12.0 to 14.0, after which, particles are grown by controlling a particle growth aqueous solution that includes the formed nuclei so that the pH value at a standard solution temperature of 25° C. becomes 10.5 to 12.0, and so that the pH value is lower than the pH value during nucleation. The crystallization reaction is performed in a non-oxidizing atmosphere at least in a range after the processing time exceeds at least 40% of the total time of the particle growth process from the start of the particle growth process where the oxygen concentration is 1 volume % or less, and with controlling an agitation power requirement per unit volume into a range of 0.5 kW/mto 4 kW/mat least during the nucleation process.

Nickel composite hydroxide and manufacturing method thereof, cathode active material for nonaqueos-electrolyte secondary battery and manufacturing method thereof, and nonaqueous-electrolyte secondary battery

A method of manufacturing a positive electrode active material for a lithium-ion secondary battery includes a water-washing step of washing a lithium-nickel composite oxide containing Li, Ni, and an element M with water, and conducting a filtration to form a washed-cake, a mixing step of mixing, while heating, the washed-cake and a tungsten compound without lithium while heating to obtain a tungsten mixture, and a heat treatment step of heat-treating the tungsten mixture, wherein a water content of the washed-cake is 3.0% by mass or more and 10.0% by mass or less, a ratio of a number of tungsten atoms contained in the tungsten mixture to a total number of nickel and the element M atoms contained in the lithium-nickel composite oxide is 0.05 at. % or more and 3.00 at. % or less, and a temperature of the mixing step is 30° C. or higher and 70° C. or lower.

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

The present invention provides a method of manufacturing a positive electrode active material for a lithium ion secondary battery. The method includes a water-washing step of washing a lithium-nickel composite oxide containing 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, T, Co, and Al) with water, and conducting a filtration to form a washed cake; a filling step of filling, the washed cake which is a material to be dried and a tungsten compound without lithium into a dryer; and a drying step of drying the material to be dried by the dryer with flowing, wherein the filling step includes a time period in which the washed cake and the tungsten compound without lithium are supplied to the dryer at the same time.

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

Provided are a cathode active material having a suitable particle size and high uniformity, and a nickel composite hydroxide as a precursor of the cathode active material. When obtaining nickel composite hydroxide by a crystallization reaction, nucleation is performed by controlling a nucleation aqueous solution that includes a metal compound, which includes nickel, and an ammonium ion donor so that the pH value at a standard solution temperature of 25&#xb0; C. becomes 12.0 to 14.0, after which, particles are grown by controlling a particle growth aqueous solution that includes the formed nuclei so that the pH value at a standard solution temperature of 25&#xb0; C. becomes 10.5 to 12.0, and so that the pH value is lower than the pH value during nucleation. The crystallization reaction is performed in a non-oxidizing atmosphere at least in a range after the processing time exceeds at least 40% of the total time of the particle growth process from the start of the particle growth process where the oxygen concentration is 1 volume % or less, and with controlling an agitation power requirement per unit volume into a range of 0.5 kW/mto 4 kW/mat least during the nucleation process.

A positive electrode active material for lithium secondary batteries disclosed herein comprises a lithium transition metal oxide of a layered structure, represented by formula LiNiCoMnCaMO(where &#x2212;0.05&#x2264;&#x3b1;&#x2264;0.2, x+y+z+&#x3b2;+&#x3b3;&#x2245;1, 0.3&#x2264;x&#x2264;&#x2264;0.7, 0.1&#x2264;y&#x2264;0.4, 0.1&#x2264;z&#x2264;0.4, 0.0002&#x2264;&#x3b2;&#x2264;0.0025, 0.0002&#x2264;&#x3b2;+&#x3b3;&#x2264;0.02, and in a case where &#x3b3;&#x3e;0, M is absent or represents one, two or more elements selected from the group consisting of Na, Mg, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W). The tap density of the positive electrode active material ranges from 1.8 to 2.5 g/cm.

Positive electrode active material, and lithium secondary battery using same

Provided are a positive electrode active material for nonagueous secondary batteries, the material having a narrow particle-size distribution and a monodisperse property and being capable of increasing a battery capacity; an industrial production method thereof; and a nonaqueous secondary battery using the positive electrode active material and having excellent electrical characteristics. The positive electrode active material is represented by a general formula: LiNiCoMnMO(wherein, 0.05&#x2264;u&#x2264;0.95, x+y+z+t=1, 0&#x2264;x&#x2264;0.5, 0&#x2264;y&#x2264;0.5, 0.5&#x2264;z&#x3c;0.8, 0&#x2264;t&#x2264;0.1, and M is an additive element and at least one element selected from Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, and W), has an average particle diameter of 3 to 12 um, and has [(d&#x2212;d)/average particle diameter], an index indicating a scale of particle-size distribution, of 0.60 or less.

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

Nickel composite hydroxide and manufacturing method thereof, cathode active material for nonaqueous-electrolyte secondary battery and manufacturing method thereof, and nonaqueous-electrolyte secondary battery

Growing community of inventors

Ehime, Japan

Shuhei Oda