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:
Nov. 14, 2017
Filed:
May. 31, 2016
Hitachi Maxell, Ltd., Ibaraki-shi, Osaka, JP;
Tomohito Sekiya, Ibaraki, JP;
Hiroshi Abe, Ibaraki, JP;
Akira Inaba, Ibaraki, JP;
Susumu Yoshikawa, Ibaraki, JP;
Yuji Hashimoto, Ibaraki, JP;
Seiji Ishizawa, Ibaraki, JP;
Toshihiro Abe, Ibaraki, JP;
HITACHI MAXELL, LTD., Osaka, JP;
Abstract
There is provided a lithium ion secondary battery with a high capacity and having excellent cycle characteristics. The lithium ion secondary battery, including a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte liquid. Here, the positive electrode comprises a positive electrode material in which a surface of particles of a positive electrode active material is coated with an Al-containing oxide. The Al-containing oxide has an average coating thickness of 5 to 50 nm. The positive electrode active material contained in the positive electrode material comprises a lithium cobalt oxide comprising Co and at least one kind of an element Mselected from the group consisting of Mg, Zr, Ni, Mn, Ti and Al. The negative electrode comprises a material S including SiO(0.5≦x≦1.5) as a negative electrode active material, wherein in 100 mass % of a total of the negative electrode active material included in the negative electrode, the materials S is included in the negative electrode active material at a content of 10 mass % or more.