Sumitomo Metal Mining Company, Ltd.

Sanyo Electric Co., Ltd.

Shinichi Yasuda

Tadahito Kanaizuka

Shin Imaizumi

Hideo Sasaoka

Takahiro Sakamoto

Yutaka Kawatate

Yasunori Yamanobe

Atsushi Kawamoto

Shinichi Hayashi

Atsushi Tamura

Koichi Yamagishi

An objective of the present invention is to provide a non-aqueous electrolyte secondary battery positive electrode active material formed from a lithium-nickel composite oxide which, while retaining high capacity and a high level of safety, has an excellent cycle characteristic by controlling reaction resistance and a method for producing it. [Solution] A lithium-nickel composite oxide is produced by steps (a) to (c) described below: (a) nickel hydroxide and/or nickel oxyhydroxide in a prescribed composition are sintered in a non-reducing atmosphere having 850&#xb0; C. or lower to give nickel oxide; (b) after the nickel oxide and a lithium compound are mixed in a prescribed molar ratio, the mixture is sintered in an oxygen atmosphere at a temperature of 650 to 850&#xb0; C.; and (c) after an obtained powder is made to be in a prescribed slurry concentration, it is washed with water during a period of time which satisfies the following formula:/40&#x3c;/10wherein A is a time for washing with water presented as a unit of a minute, B is a slurry concentration of the obtained powder presented as a unit of g/L, filtered and dried.

Nickel composite hydroxide particle and process for producing the same, positive electrode active material for non-aqueous electrolyte secondary battery and process for producing the same, and non-aqueous electrolyte secondary battery

A magnetic disc manufacturing apparatus is includes a polishing device for conducting a surface polishing treatment on a disc, a supply device for supplying lubricant onto the polished disc, and a feeding mechanism for feeding the disc between the devices. If necessary, it is provided with a curing device for curing the lubricant on the disc. The treatments of the devices and the disc feeding operation are synchronized with one another, and a disc processed in each device is fed to a next device at a constant time interval by the feeding mechanism, thereby performing a continuous disc manufacturing process.

Manufacturing method for magnetic disc

A process for fabricating a magnetic disk which comprises texturing a magnetic disk substrate made of a non-magnetic material having provided on the surface thereof a hard layer of a metal or an oxide to thereby provide fine irregularities on the surface of said substrate, followed by establishing thereon a magnetic recording layer comprising a film of a ferromagnetic metal, wherein said texturing is carried out using a processing solution comprising an aqueous solution of a surface active agent having dispersed therein diamond abrasive grains substantially only not larger than 4 .mu.m in grain diameter.

Process for fabricating magnetic disks

Growing community of inventors

Niihama, Japan

Shinichi Yasuda