Sumitomo Metal Mining Company, Ltd.

Yuji Kawakami

Toshiaki Terao

Tomomichi Nihei

Yasutaka Kamata

Akihiro Murakami

Isao Kaneko

The production method is a method for producing a positive electrode active material for a lithium ion secondary battery which contains at least nickel and lithium, the method including: a firing process in which a mixture of a nickel compound powder and a lithium compound powder is fired; and a water washing process in which a lithium-nickel composite oxide powder obtained in the firing process is washed with water, wherein the firing process is performed under conditions such that a value obtained by dividing a ratio of an amount-of-substance of lithium to a total amount-of-substance of transition metals other than lithium in the lithium-nickel composite oxide powder after the washing with water by a ratio of an amount-of-substance of lithium to a total amount-of-substance of transition metals other than lithium in the lithium-nickel composite oxide powder before the washing with water exceeds 0.95.

Positive electrode active material for lithium ion secondary batteries and method for producing same

A nickel complex oxide having a carbon content of 0.15% by mass or lower.

Nickel complex oxide and method of manufacturing lithium nickel complex oxide

The present invention provides a silver powder that has an appropriate viscosity range at the time of paste production, can be easily kneaded, and prevents flake occurrence. The silver powder has a dibutyl phthalate absorption amount, measured by a method of JIS-K6217-4, of 7.0 to 9.5 ml/100 g, and has an oil absorption profile at the time of measurement of the absorption amount, having two peaks, or one peak having a half width of not more than 1.5 ml/100 g.

Silver powder

Provided is a silver powder which has an appropriate viscosity range at the time of paste production, can be easily kneaded, and prevents the occurrence of flakes. The silver powder to be used has a specific surface area ratio SA/SAof 0.5 to 0.9, wherein SAis a specific surface area measured by the BET method, and SAis a specific surface area calculated from a mean primary-particle diameter Dmeasured with a scanning electron microscope. Furthermore, the silver powder preferably has a degree of aggregation of 1.5 to 5.0, the degree being obtained in such a manner that a volume median diameter Dmeasured by laser diffraction scattering is divided by the foregoing Ds.

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Ehime, Japan

Yuji Kawakami