US 12,283,684 B2
Secondary battery electrode and method for producing the electrode
Naohiro Mashimo, Toyota (JP); Katsushi Enokihara, Toyota (JP); and Haruka Shionoya, Toyota (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Feb. 25, 2022, as Appl. No. 17/680,310.
Claims priority of application No. 2021-031945 (JP), filed on Mar. 1, 2021.
Prior Publication US 2022/0278305 A1, Sep. 1, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/13 (2010.01); H01M 4/36 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/133 (2010.01); H01M 4/1391 (2010.01); H01M 4/1393 (2010.01)
CPC H01M 4/043 (2013.01) [H01M 4/0404 (2013.01); H01M 4/13 (2013.01); H01M 4/366 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 4/0435 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/1391 (2013.01); H01M 4/1393 (2013.01); Y02E 60/10 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A secondary battery electrode that is either a positive or negative electrode of a secondary battery, the secondary battery electrode comprising:
a long sheet-shaped electrode current collector; and
an electrode active material layer formed on the long sheet-shaped electrode current collector, wherein
the electrode active material layer has a concave/convex shape on its surface in a predetermined pattern at a constant pitch along a longitudinal direction of the long sheet-shaped electrode current collector, and
in a cross-sectional SEM image of the electrode active material layer, linear cracks are unevenly distributed in a concave portion compared to in a convex portion.