US 11,749,801 B2
All solid state battery and manufacturing method
Sangwook Han, Ansan-si (KR); Hannah Song, Ansan-si (KR); and Kyeong Wi Park, Suwon-si (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed on Aug. 9, 2021, as Appl. No. 17/397,190.
Claims priority of application No. 10-2020-0179849 (KR), filed on Dec. 21, 2020.
Prior Publication US 2022/0199997 A1, Jun. 23, 2022
Int. Cl. H01M 4/58 (2010.01); H01M 4/66 (2006.01); H01M 4/04 (2006.01); H01M 10/058 (2010.01); H01M 10/056 (2010.01); H01M 10/0562 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/5815 (2013.01) [H01M 4/0404 (2013.01); H01M 4/661 (2013.01); H01M 4/663 (2013.01); H01M 4/666 (2013.01); H01M 10/058 (2013.01); H01M 10/0562 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0068 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An all solid state battery comprising:
a sulfide-based solid electrolyte layer;
a negative electrode comprising:
a negative active material layer disposed on a first surface of the solid electrolyte layer;
a negative buffer layer disposed on a first surface of the negative active material layer, the negative buffer layer comprising a mixture of a first sulfide-based material, a first conductive material, and a second binder, wherein the negative buffer layer has a different composition than the negative active material layer;
a negative primer layer disposed on a first surface of the negative buffer layer, wherein the negative buffer layer has a degree of softness that is higher than that of the negative primer layer; and
a negative current collector layer having a second surface disposed on a first surface of the negative primer layer, the second surface of the negative current collector layer having a surface roughness; and
a positive electrode comprising:
a positive active material layer disposed on a second surface of the solid electrolyte layer;
a positive buffer layer disposed on a second surface of the positive active material layer the positive buffer layer comprising a mixture of the first sulfide-based material, the first conductive material, and the second binder without an active material, wherein the positive buffer layer has a different composition than the positive active material layer;
a positive primer layer disposed on a second surface of the positive buffer layer, wherein the positive buffer layer has a degree of softness that is higher than that of the positive primer layer; and
a positive current collector layer having a first surface disposed on a second surface of the positive primer layer, the first surface of the positive current collector layer having a surface roughness.