Panasonic Corporation

Sumitomo Metal Mining Company, Ltd.

Tomoko Iwanaga

Satoshi Matsumoto

Hideo Sasaoka

Shinji Arimoto

Yutaka Kawatate

A method for manufacturing a positive electrode active material includes: (a) preparing a fired powder of a lithium nickel composite oxide by mixing a nickel compound selected from a nickel hydroxide including nickel, and an element selected from other transition metal elements, elements of the second group and elements of the thirteenth group of the Periodic System, a nickel oxyhydroxide thereof, and a nickel oxide obtained by roasting thereof, and a lithium compound, and firing the mixture at a maximum temperature of 650&#xb0; C. to 850&#xb0; C. under oxygen atmosphere; and (b) preparing a lithium nickel composite oxide powder by mixing the fired powder with water to obtain a slurry, washing the fired powder with water at a temperature of 10&#xb0; C. to 40&#xb0; C., while controlling an electrical conductivity of a liquid portion of the slurry to 30 mS/cm to 60 mS/cm, then filtering and drying the resultant fired powder.

Positive electrode active material manufacturing method with control of washing slurry liquid electrical conductivity

A positive electrode active material for a nonaqueous electrolyte secondary battery that is constituted by a lithium nickel composite oxide that combines a high capacity with excellent thermal stability, a manufacturing method suitable for industrial production, and a nonaqueous electrolyte secondary battery of high safety. A positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium nickel composite oxide represented by the following composition formula (1):LiNiM1O&#x2003;&#x2003;(1)(where M1 represents at least one element selected from transition metal elements other than Ni, elements of the second group of the Periodic System and elements of the thirteenth group of the Periodic System; a satisfies the condition 0.01&#x2264;a&#x2264;0.5; and b satisfies the condition 0.85&#x2264;b&#x2264;1.05). The content of carbon in the lithium nickel composite oxide is equal to or less than 0.08% by mass.

Positive electrode active material for nonaqueous electrolyte secondary battery, manufacturing method of same, and nonaqueous electrolyte secondary battery using same

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Ehime, Japan

Tomoko Iwanaga