US 11,699,790 B2
Single-layer and multilayer graphene, method of manufacturing the same, object including the same, and electric device including the same
Teppei Oguni, Kanagawa (JP); Takeshi Osada, Kanagawa (JP); Toshihiko Takeuchi, Kanagawa (JP); and Kuniharu Nomoto, Saitama (JP)
Assigned to SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Kanagawa-ken (JP)
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
Filed on Mar. 29, 2022, as Appl. No. 17/706,646.
Application 17/706,646 is a continuation of application No. 16/862,651, filed on Apr. 30, 2020, granted, now 11,296,322, issued on Apr. 5, 2022.
Application 16/862,651 is a continuation of application No. 13/483,297, filed on May 30, 2012, granted, now 10,644,315, issued on May 5, 2020.
Claims priority of application No. 2011-124952 (JP), filed on Jun. 3, 2011; and application No. 2011-125027 (JP), filed on Jun. 3, 2011.
Prior Publication US 2022/0223866 A1, Jul. 14, 2022
Int. Cl. H01M 4/587 (2010.01); H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/66 (2006.01); H01M 4/70 (2006.01); B82Y 40/00 (2011.01); B82Y 30/00 (2011.01); C25D 5/48 (2006.01); C25D 5/50 (2006.01); C25D 13/02 (2006.01); C25D 13/12 (2006.01); H01M 4/1393 (2010.01)
CPC H01M 4/587 (2013.01) [B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C25D 5/48 (2013.01); C25D 5/50 (2013.01); C25D 13/02 (2013.01); C25D 13/12 (2013.01); H01M 4/0452 (2013.01); H01M 4/0471 (2013.01); H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 4/66 (2013.01); H01M 4/70 (2013.01); Y02E 60/10 (2013.01); Y10T 428/24355 (2015.01)] 18 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a positive electrode; and
a negative electrode,
wherein the negative electrode comprises:
a negative current collector;
a negative active material layer over the negative current collector, the negative active material layer having an uneven surface; and
a plurality of graphene layers over the uneven surface,
wherein a first part of the plurality of graphene layers is in contact with the uneven surface,
wherein a space is formed between a second part of the plurality of graphene layers and a depression of the uneven surface,
wherein a number of layers of the plurality of graphene layers is 50 or less,
wherein each of the plurality of graphene layers has at least one pore, and
wherein the pore of a first layer of the plurality of graphene layers does not overlap the pore of a second layer adjacent to the first layer of the plurality of graphene layers.