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. 30, 2012
Filed:
Dec. 14, 2005
Takehiko Tanaka, Fukushima, JP;
Yosuke Hosoya, Fukushima, JP;
Yoshikatsu Yamamoto, Fukushima, JP;
Kiyohiko Suzuki, Fukushima, JP;
Keizo Koga, Fukushima, JP;
Takehiko Tanaka, Fukushima, JP;
Yosuke Hosoya, Fukushima, JP;
Yoshikatsu Yamamoto, Fukushima, JP;
Kiyohiko Suzuki, Fukushima, JP;
Keizo Koga, Fukushima, JP;
Sony Corporation, Tokyo, JP;
Abstract
A positive active material including a compound expressed by a general formula LiMM'M″O(here, M designates at least one kind of element selected from Co, Ni and Mn, M′ designates at least one kind of element selected from Al, Cr, V, Fe, Cu, Zn, Sn, Ti, Mg, Sr, B, Ga, In, Si and Ge, and M″ designates at least one kind of element selected from Mg, Ca, B and Ga. Further, x is designated by an expression of 0.9≦x<1, y is indicated by an expression of 0.001≦y≦0.5, z is indicated by an expression of 0≦z≦0.5, and m is indicated by an expression of 0.5≦m) and lithium manganese oxide expressed by a general formula LiMnMaO(here, the value of s is expressed by 0.9≦s, the value of t is located within a range expressed by 0.01≦t≦0.5, and Ma indicates one or a plurality of elements between Fe, Co, Ni, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge) are included, so that both a large capacity and the suppression of the rise of temperature of a battery upon overcharging operation are achieved.