US 12,255,018 B2
Nickel foil for production of thin-film capacitor, and manufacturing method for same
Ki Deok Song, Iksan-si (KR); Chang Yol Yang, Iksan-si (KR); and Sang Hwa Yoon, Iksan-si (KR)
Assigned to LOTTE ENERGY MATERIALS CORPORATION, Jeollabuk-Do (KR)
Appl. No. 17/753,873
Filed by ILJIN MATERIALS CO., LTD., Iksan-si (KR)
PCT Filed Dec. 17, 2019, PCT No. PCT/KR2019/017919
§ 371(c)(1), (2) Date Mar. 16, 2022,
PCT Pub. No. WO2021/080085, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 10-2019-0132806 (KR), filed on Oct. 24, 2019.
Prior Publication US 2022/0367114 A1, Nov. 17, 2022
Int. Cl. H01G 4/008 (2006.01); H01G 4/33 (2006.01)
CPC H01G 4/008 (2013.01) [H01G 4/33 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of preparing an electrolytic nickel foil for a thin film capacitor, on at least one surface thereof, a flat surface having an arithmetic average roughness (Ra) of 0.05 μm or less, a ten-point average roughness (Rz) of 0.20 μm or less, a maximum protrusion height (Rt) of 0.50 μm or less, and a 60° specular gloss of 200 GU or more,
wherein the method comprises performing electrolytic plating with an electrolyte including 400 to 600 g/L of a nickel ion precursor, 10 to 30 g/L of a pH buffer, and 0.5 to 2.0 g/L of a roughness controlling agent and having a pH of 1 to 5, and
wherein the roughness controlling agent comprises saccharin and sodium allyl sulfonate, and
the concentration ratio of saccharin and sodium allyl sulfonate is 1:0.05 to 1:20.