US 12,476,256 B2
Electrolytic foil and battery current collector
Michio Kawamura, Kudamatsu (JP); Shinichiro Horie, Kudamatsu (JP); Etsuro Tsutsumi, Kudamatsu (JP); Yuma Yoshizaki, Kudamatsu (JP); and Koh Yoshioka, Kudamatsu (JP)
Assigned to TOYO KOHAN CO., LTD., Tokyo (JP)
Appl. No. 17/768,966
Filed by TOYO KOHAN CO., LTD., Tokyo (JP)
PCT Filed Sep. 29, 2020, PCT No. PCT/JP2020/036826
§ 371(c)(1), (2) Date Apr. 14, 2022,
PCT Pub. No. WO2021/075253, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 2019-189800 (JP), filed on Oct. 16, 2019.
Prior Publication US 2024/0105960 A1, Mar. 28, 2024
Int. Cl. H01M 4/66 (2006.01); H01M 4/70 (2006.01)
CPC H01M 4/662 (2013.01) [H01M 4/70 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An electrolytic foil containing a Ni—Fe alloy layer, the electrolytic foil being characterized by having a thickness of 1.5 to 10 μm, by having a first surface and a second surface, and by that a value of a maximum valley depth Sv divided by the thickness is equal to or less than 0.5 for the first surface and the second surface,
wherein at least one metallic layer of a metallic species different from the Ni—Fe alloy layer is laminated on the Ni—Fe alloy layer, and
wherein a proportion of the thickness of the Ni—Fe alloy layer in the electrolytic foil is 18% to 95%.