US 12,080,490 B2
Electrode foil for electrolytic capacitor, electrolytic capacitor, and production methods therefor
Mitsuhisa Yoshimura, Osaka (JP); Naomi Kurihara, Osaka (JP); Miwa Ogawa, Osaka (JP); and Yasuhiro Tsuda, Osaka (JP)
Assigned to Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Aug. 9, 2021, as Appl. No. 17/396,767.
Application 17/396,767 is a continuation of application No. PCT/JP2020/007016, filed on Feb. 21, 2020.
Claims priority of application No. 2019-037030 (JP), filed on Feb. 28, 2019.
Prior Publication US 2021/0366661 A1, Nov. 25, 2021
Int. Cl. H01G 9/07 (2006.01); H01G 9/045 (2006.01); H01G 9/055 (2006.01); H01G 9/145 (2006.01); H01G 9/15 (2006.01)
CPC H01G 9/07 (2013.01) [H01G 9/045 (2013.01); H01G 9/055 (2013.01); H01G 9/145 (2013.01); H01G 9/15 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An electrode foil for an electrolytic capacitor, the electrode foil comprising:
a metal foil having a porous part; and
a dielectric layer covering a surface of a metal framework constituting the porous part, wherein:
the dielectric layer includes a first layer containing an oxide of a second metal different from a first metal contained in the metal framework, the first layer having a thickness T1,
the first layer contains at least one kind of additive element selected from the group consisting of carbon, phosphorus, boron, and nitrogen,
the first layer has an inner surface and an outer surface, the inner surface facing the metal framework, the outer surface being opposite to the inner surface,
the at least one kind of additive element is contained in a region from the outer surface of the first layer to a depth of at least 0.05×T1,
the first layer includes a first region and a second region, the first region being from the outer surface to a center of the first layer in a thickness direction, the second region being from the center to the inner surface, and
a content of the at least one kind of additive element in the first region is greater than a content of the at least one kind of additive element in the second region.