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:
Nov. 28, 2000
Filed:
Aug. 06, 1998
Hiroyuki Sakamoto, Neyagawa, JP;
Hidekatsu Izumi, Neyagawa, JP;
Yoichi Izumi, Moriguchi, JP;
Isao Matsumoto, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The energy density of active materials for a positive electrode comprising an oxide containing Ni as a main metallic element is enhanced, and, moreover, a method for manufacturing them is provided. The oxide includes Ni as a main metallic element and contains at least Mn in the state of solid solution or eutectic mixture, wherein the average valence of Mn is 3.3 valences or more, the tap density is 1.7 g/cc or more, the half width of a peak at around 2.theta.=37-40.degree. of X-ray diffraction using CuK.alpha. ray is 1.2 deg or less, the ratio B/A of integrated intensity B of a peak at around 2.theta.=18-21.degree. to integrated intensity A of a peak at around 2.theta.=37-40.degree. is 1.25 or less, and the volume of pores having a pore radius of 40 .ANG. or less is 60% or more of the total pore volume. The oxide is obtained by growing in the state of keeping the dissolved oxygen concentration in the aqueous solution in the reaction vessel and then oxidizing the oxide.