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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.:

US 9812702 B1

PDFFull Text
Date of Patent:
Nov. 07, 2017

Filed:

Jul. 17, 2014

Lithium ion secondary battery having positive electrode that comprises thermal run-away suppressing layer on positive electrode active material layer

Applicants:

Kabushiki Kaisha Toyota Jidoshokki, Kariya-shi, Aichi, JP;

National Institute of Advanced Industrial Science and Technology, Tokyo, JP;

Inventors:

Yuta Ikeuchi, Ikeda, JP;

Toshikatsu Kojima, Ikeda, JP;

Tetsuo Sakai, Ikeda, JP;

Tatsuya Eguchi, Kariya, JP;

Hitoshi Aikiyo, Kariya, JP;

Akira Kojima, Kariya, JP;

Assignees:

KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya-shi, Aichi, JP;

NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Chiyoda-ku, Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Jane Rhee

Int. Cl.
CPC ...
H01M 4/00 (2006.01); H01M 4/131 (2010.01); H01M 4/38 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/36 (2006.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01);
U.S. Cl.
CPC ...
H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/62 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01);
Abstract

To provide a lithium ion secondary battery capable of suppressing thermal run-away when internal short circuiting occurs. The lithium ion secondary battery includes: a positive electrode including a current collector, a positive electrode active material layer that is formed on the current collector and that contains a lithium-containing complex oxide having a layered rock salt structure and being represented by general formula: LiNiCoMnDO(0.2≦a≦1; b+c+d+e=1; 0≦e<1; D is at least one element selected from Li, Fe, Cr, Cu, Zn, Ca, Mg, S, Si, Na, K, and Al; 1.7≦f≦2.1), and a thermal run-away suppressing layer formed on the positive electrode active material layer and containing a lithium transition metal silicate; and a negative electrode including a negative electrode active material. A ratio of the mass of the lithium-containing complex oxide with respect to the mass of the lithium transition metal silicate in the positive electrode is not lower than 1.5.

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