The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2011
Filed:
Apr. 18, 2007
Kazuyuki Tanino, Ibaraki, JP;
Reiko Sasaki, Nara, JP;
Takashi Yoshida, Kanagawa, JP;
Yoshihiro Kawakami, Ehime, JP;
Kazuyuki Tanino, Ibaraki, JP;
Reiko Sasaki, Nara, JP;
Takashi Yoshida, Kanagawa, JP;
Yoshihiro Kawakami, Ehime, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
The positive electrode active material powder of the present invention is a positive electrode active material powder, including primary particles and aggregated particles of primary particles, wherein an average particle diameter of primary particles and aggregated particles of primary particles in the powder is 0.1 μm or more and 3 μm or less on a volume basis, the percentage of [volumetric sum of particles having a particle diameter of 5 μm or more]/[volumetric sum of entire particles] is 10% or less, and a BET specific surface area of the powder is more than 2 m/g and 7 m/g or less. When this positive electrode active material powder is used for a nonaqueous electrolyte secondary battery, it becomes possible to exhibit a high discharge capacity and also exhibit a high output at a high current rate.