	US 12,334,563 B2
	Ni-plated steel foil for nickel-hydrogen secondary battery current collector, nickel-hydrogen secondary battery current collector, and nickel-hydrogen secondary battery
Hiroto Unno, Tokyo (JP); Masahiro Fukuda, Tokyo (JP); Naoki Fujimoto, Tokyo (JP); and Tatsuo Nagata, Tokyo (JP)
Assigned to NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo (JP)
Appl. No. 17/915,435
Filed by NIPPON STEEL Chemical & Material Co., Ltd., Tokyo (JP)
PCT Filed Mar. 24, 2021, PCT No. PCT/JP2021/012383 § 371(c)(1), (2) Date Sep. 28, 2022, PCT Pub. No. WO2021/200506, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-064395 (JP), filed on Mar. 31, 2020; and application No. 2020-065084 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0146305 A1, May 11, 2023
Int. Cl. H01M 4/66 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01)

CPC H01M 4/667 (2013.01) [C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); H01M 4/669 (2013.01)]

15 Claims

1. An Ni-plated steel foil for nickel-hydrogen secondary battery current collectors comprising, by mass %,

C: 0.0001 to 0.0200%,

Si: 0.0001 to 0.0200%,

Mn: 0.005 to 0.300%,

P: 0.001 to 0.020%,

S: 0.0001 to 0.0100%,

Al: 0.0005 to 0.1000%,

N: 0.0001 to 0.0040%,

one or both of Ti and Nb: 0.800% or less respectively, and

a balance of Fe and impurities, and

having an Ni plating layer on both surfaces,

wherein, an Ni plating layer thickness of each of a first surface and second surface of the Ni-plated steel foil is greater than or equal to 0.15 μm,

a thickness of the Ni-plated steel foil is 5 to 50 μm,

a tensile strength is over 400 MPa but no greater than 1200 MPa, and

a surface defect area percentage is less than or equal to 5.00% for each of the first surface and second surface of the Ni-plated steel foil.