US 12,456,735 B2
Negative electrode and solid-state secondary battery including the same
Minsuk Lee, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Feb. 18, 2021, as Appl. No. 17/249,046.
Claims priority of application No. 10-2020-0019993 (KR), filed on Feb. 18, 2020.
Prior Publication US 2021/0257624 A1, Aug. 19, 2021
Int. Cl. H01M 4/66 (2006.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0562 (2010.01)
CPC H01M 4/667 (2013.01) [H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/622 (2013.01); H01M 4/661 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); H01M 2004/027 (2013.01); H01M 4/131 (2013.01); H01M 2300/0068 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A negative electrode comprising:
a negative electrode current collector; and
a first negative electrode active material layer on the negative electrode current collector,
wherein the negative electrode current collector comprises:
a first metal current collector comprising a first metal; and
a coating layer on a top surface and on a side surface of the first metal current collector, the coating layer comprising a second metal, the second metal having a greater Mohs hardness than the first metal, and
wherein the first negative electrode active material layer is only on one side of the negative electrode current collector, the one side being over the top surface, and
wherein the coating layer on the side surface of the first metal current collector is separated from a side surface of the first negative electrode active material layer,
wherein an end of the first negative electrode active material layer extends further than an end of the first metal current collector in an extension direction of the negative electrode and overlaps with the coating layer on the side surface of the first metal current collector in a thickness direction of the negative electrode, and
wherein a negative electrode active material in the first negative electrode active material layer comprises a mixture of first particles comprising amorphous carbon and second particles composed of a metal and/or metalloid, the second particles composed of the metal and/or metalloid being contained in an amount of about 8 wt % to 60 wt % with respect to a total weight of the mixture.