US 11,984,593 B2
Secondary battery, battery pack, and vehicle
Keigo Hoshina, Yokohama (JP); Yasunobu Yamashita, Tokyo (JP); and Shinsuke Matsuno, Tokyo (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Sep. 2, 2020, as Appl. No. 17/009,927.
Claims priority of application No. 2020-048662 (JP), filed on Mar. 19, 2020.
Prior Publication US 2021/0296643 A1, Sep. 23, 2021
Int. Cl. H01M 4/525 (2010.01); H01M 4/131 (2010.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 50/20 (2021.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 50/20 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0071 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A secondary battery, comprising:
a positive electrode, the positive electrode comprising a positive electrode active material-containing layer, the positive electrode active material-containing layer comprising a lithium nickel cobalt manganese composite oxide;
a negative electrode comprising a negative electrode active material-containing layer having a first surface;
an insulating layer comprising a solid electrolyte layer having a second surface, the solid electrolyte layer comprising a Li ion conductive oxide; and
a nonaqueous electrolyte,
the first surface and the second surface at least partially facing one another or at least partially in contact with one another, at least part of the second surface or at least parts of the first surface and the second surface comprising a Mn-containing substance, and an abundance ratio of Mn on the second surface being higher than an abundance ratio of Mn on the first surface, the abundance ratio of Mn on the first surface being from 0 atom % to 0.5 atom %, and the abundance ratio of Mn on the second surface being from 0.9 atom % to 1.3 atom %.