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. 20, 2018
Filed:
May. 19, 2014
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Naokage Tanaka, Tokyo, JP;
Kento Hoshi, Tokyo, JP;
Shuichi Suzuki, Tokyo, JP;
Hiroshi Haruna, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The invention addresses the problem of providing a lithium ion secondary battery excellent in initial charge-discharge characteristics and life characteristics. To solve the above problem, the invention provides a lithium ion secondary battery in which an electrode group having a positive electrode and a negative electrode is housed in a battery can, wherein the negative electrode includes a negative electrode active material supported on a negative electrode foil, and the negative electrode active material includes cores having SiO as a main component, a composite oxide coating layer of Fe and SiOdisposed on the periphery of each of the cores, and a carbon coating layer disposed on the periphery of the composite oxide coating layer of Fe and SiO.