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. 22, 2013
Filed:
Apr. 01, 2011
Masaki Hirase, Kobe, JP;
Masaki Hirase, Kobe, JP;
SANYO Electric Co., Ltd., Moriguchi-shi, Osaka, JP;
Abstract
A lithium secondary battery includes a negative electrode, a positive electrode, and an electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is provided on the negative electrode current collector. The negative electrode active material layer contains silicon and oxygen. A low oxygen content layer is provided in a portion of the negative electrode active material layer on the negative electrode current collector side, the low oxygen content layer having an oxygen content lower than that of the remaining portion of the negative electrode active material layer. The thickness of the low oxygen content layer is 25% or less of the thickness of the negative electrode active material layer.