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. 24, 2015
Filed:
Aug. 13, 2012
Satoshi Fujiki, Fukushima, JP;
Hirotaka Fukudome, Fukushima, JP;
Kazunari Motohashi, Fukushima, JP;
Yosuke Hosoya, Fukushima, JP;
Yoshihiro Kudo, Tokyo, JP;
Satoshi Fujiki, Fukushima, JP;
Hirotaka Fukudome, Fukushima, JP;
Kazunari Motohashi, Fukushima, JP;
Yosuke Hosoya, Fukushima, JP;
Yoshihiro Kudo, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A cathode includes a lithium transition metal complex compound including lithium, one, or two or more transition metals, magnesium, and oxygen as constituent elements. In a standardized X-ray absorption spectrum of the lithium transition metal complex compound measured by an X-ray absorption spectroscopic method, a first absorption edge having absorption edge energy E1 in X-ray absorption intensity of about 0.5 exits in a range where X-ray energy is from about 1303 eV to about 1313 eV both inclusive, in a discharged state in which a discharge voltage is about 3.0 V, and a second absorption edge having absorption edge energy E2 in X-ray absorption intensity of about 0.5 exits, in a charged state in which a charge voltage V is from about 4.3 V to about 4.5 V both inclusive. The absorption edge energies E1 and E2 and the charge voltage V satisfy a relation of E2−E1≧(V−4.25)×4.