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:
Jul. 20, 2010
Filed:
Dec. 19, 2006
Takashi Tokunaga, Fukushima, JP;
Yoshiaki Obana, Fukushima, JP;
Hiroyuki Akashi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A lithium ion secondary battery is provided. The battery includes a positive electrode having at least a cathode active material and a binder, a negative electrode, an electrolyte, and a separator which are arranged between the positive electrode and the negative electrode, and in which an open circuit voltage per unit cell in a full charging state lies within (4.25V≦voltage≦6.00V). The cathode active material includes either a lithium-cobalt composite oxide expressed by a general formula: LiCoMeO(Me denotes metal elements of at least one, two or more kinds selected from V, Cu, Zr, Zn, Mg, Al, and Fe; 0.9≦a≦1.1; 0≦x=0.3; and −0.1≦b≦0.1) or a lithium-cobalt-nickel-manganese oxide expressed by a general formula: LiNiCoMnMeO(0.9≦a≦1.1; 0<x<0.4; 0<y<0.4; 0<z<0.3; and −0.1≦b≦0.1). The binder includes a polyacrylonitrile resin.