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:
Feb. 26, 2008
Filed:
Dec. 06, 2002
Hiroyuki Sakamoto, Toyohashi, JP;
Hidekatsu Izumi, Katano, JP;
Yoichi Izumi, Habikino, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A particulate positive electrode active material for an alkaline storage battery comprising: (a) solid solution nickel hydroxide particles containing at least magnesium and (b) a coating layer comprising cobalt oxide being formed on the surface of the solid solution nickel hydroxide particles. The amount of magnesium contained in the solid solution nickel hydroxide particles (a) is not smaller than 2 mol % and not larger than 15 mol % of the total amount of metal elements contained in the solid solution nickel hydroxide particles (a). BET specific surface area of the solid solution nickel hydroxide particles (a) measured by nitrogen gas adsorption is not smaller than 5 m/g and not larger than 15 m/g. The coating layer (b) further comprises at least one element Xs selected from the group consisting of yttrium, ytterbium, lutetium, titanium and calcium.