US 9,812,702 B2
Lithium ion secondary battery having positive electrode that comprises thermal run-away suppressing layer on positive electrode active material layer
Yuta Ikeuchi, Ikeda (JP); Toshikatsu Kojima, Ikeda (JP); Tetsuo Sakai, Ikeda (JP); Tatsuya Eguchi, Kariya (JP); Hitoshi Aikiyo, Kariya (JP); and Akira Kojima, Kariya (JP)
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya-shi, Aichi (JP); and NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Chiyoda-ku, Tokyo (JP)
Appl. No. 14/912,971
Filed by KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya-shi, Aichi (JP); and NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Tokyo (JP)
PCT Filed Jul. 17, 2014, PCT No. PCT/JP2014/003787
§ 371(c)(1), (2) Date Feb. 19, 2016,
PCT Pub. No. WO2015/025466, PCT Pub. Date Feb. 26, 2015.
Claims priority of application No. 2013-172195 (JP), filed on Aug. 22, 2013.
Prior Publication US 2016/0204421 A1, Jul. 14, 2016
Int. Cl. 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)
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)] 5 Claims
OG exemplary drawing
 
1. A lithium ion secondary battery comprising:
a positive electrode including a current collector, a positive electrode active material layer that is formed on the current collector and that contains a positive electrode active material having a layered rock salt structure and being represented by a compositional formula: LiaNibCocMndDeOf (0.2≤a≤1; b+c+d+e=1; 1/3≤b<1; 20/100≤c<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 that is formed on the positive electrode active material layer and that contains a lithium transition metal silicate and a binding agent in an amount of 1 to 50 parts by mass with respect to 100 parts by mass of the lithium transition metal silicate; and
a negative electrode including a negative electrode active material, wherein
a ratio of a mass of the lithium-containing complex oxide with respect to a mass of the lithium transition metal silicate in the positive electrode is not lower than 1.5.