US 12,322,809 B2
Current collector for battery, and battery
Shinichirou Horie, Tokyo (JP); Hidehiko Kobayashi, Tokyo (JP); and Koh Yoshioka, Kudamatsu (JP)
Assigned to TOYO KOHAN CO., LTD., Tokyo (JP)
Appl. No. 16/341,617
Filed by TOYO KOHAN CO., LTD., Tokyo (JP)
PCT Filed Oct. 3, 2017, PCT No. PCT/JP2017/035964
§ 371(c)(1), (2) Date Apr. 12, 2019,
PCT Pub. No. WO2018/070302, PCT Pub. Date Apr. 19, 2018.
Claims priority of application No. 2016-203133 (JP), filed on Oct. 14, 2016.
Prior Publication US 2021/0376331 A1, Dec. 2, 2021
Int. Cl. H01M 4/66 (2006.01)
CPC H01M 4/661 (2013.01) [H01M 4/667 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A current collector for battery, comprising at least:
a first metal plating layer having a thickness of 1 to 10 μm and containing at least a metal selected from Cu, Fe, and Ni; and
a second metal plating layer having a thickness of 1 to 10 μm laminated on the first metal plating layer and containing at least a metal selected from Cu, Fe, and Ni other than the metal of the first metal plating layer,
wherein one of either the first metal plating layer or the second metal plating layer contains Ni and a total thickness ratio of a layer of Ni to the thickness of the current collector is 20% to 50%,
wherein a laminate interface between the first metal plating layer and the second metal plating layer has a roughness Ra≥0.12 μm, and
wherein, when a ratio of an actually-measured surface area to an area of a measurement visual field on the laminate interface is defined as S and an interface roughness index of the laminate interface is defined as Ra/S, the laminate interface has an interface roughness index (Ra/S)≥0.06.