US 12,074,340 B2
Electrode group, secondary battery, battery pack, and vehicle
Tomoe Kusama, Tokyo (JP); Kazuomi Yoshima, Yokohama (JP); Tetsuya Sasakawa, Yokohama (JP); Yasuhiro Harada, Isehara (JP); and Norio Takami, Yokohama (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Feb. 19, 2021, as Appl. No. 17/179,480.
Claims priority of application No. 2020-154463 (JP), filed on Sep. 15, 2020.
Prior Publication US 2022/0085456 A1, Mar. 17, 2022
Int. Cl. H01M 50/46 (2021.01); H01M 4/485 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0565 (2010.01); H01M 10/42 (2006.01)
CPC H01M 50/46 (2021.01) [H01M 4/485 (2013.01); H01M 4/62 (2013.01); H01M 10/0525 (2013.01); H01M 10/0565 (2013.01); H01M 10/425 (2013.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01); H01M 2300/0082 (2013.01); H01M 2300/0085 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electrode group comprising:
a positive electrode including a positive electrode current collector and a positive electrode active material-containing layer;
a negative electrode including a negative electrode current collector and a negative electrode active material-containing layer; and
a gel polymer layer interposed between at least a portion of the positive electrode active material-containing layer and at least a portion of the negative electrode active material-containing layer,
the gel polymer layer being formed of a gel electrolyte consisting of a polymer material, a first organic solvent and a first lithium salt, and a sheet base member which supports the gel electrolyte,
wherein the gel polymer layer holds a liquid-state nonaqueous electrolyte comprising a second organic solvent and a second lithium salt in the gel polymer layer,
wherein the sheet base member is an organic fiber layer including at least one organic material selected from the group consisting of: polyamide-imide, polyetherimide, polyimide, polyvinylidene fluoride, polyethylene, polypropylene, polytetrafluoroethylene, polyphenylenesulfide, liquid crystal polyester, polyether sulfone, polyether ketone, polyether ether ketone, polyethylene terephthalate, cellulose, polyolefin, polyketone, polysulfone, and polyvinyl alcohol, and
a moisture content in the negative electrode active material-containing layer is in a range of 150 ppm to 500 ppm.