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公开(公告)号：US10923288B2
公开(公告)日：2021-02-16
申请号：US16483405
申请日：2017-12-07
发明人： Yuta Shimizu , Shuhei Enoki , Masahiko Katano , Toshifumi Taira , Kazuya Fujimoto , Shinya Sone
摘要： A method for producing an electrode for an aluminum electrolytic capacitor is provided that can reduce defects in a chemical formation film formed at a chemical formation voltage of 500 V or higher.
For producing the electrode for an aluminum electrolytic capacitor, an aluminum electrode is brought into contact with pure water having a temperature of 70° C. or higher to form a hydrated film having a suitable film thickness on the aluminum electrode at a hydration step, and then chemical formation is performed thereon at a chemical formation voltage of 500 V or higher in a chemical formation solution having a temperature of 40° C. or higher at a chemical formation step. At the chemical formation step, when the relative velocity of the chemical formation solution to the aluminum electrode is represented by a three-dimensional velocity vector B−A and the absolute value of the velocity vector B−A is represented by |B−A|, the absolute value |B−A| of the velocity vector satisfies the following conditional formula. 3 cm/s≤|B−A|≤100 cm/s-
公开(公告)号：US11626257B2
公开(公告)日：2023-04-11
申请号：US16634188
申请日：2018-06-05
发明人： Shuhei Enoki , Yuta Shimizu , Masahiko Katano , Toshifumi Taira , Kazuya Fujimoto , Shinya Sone
摘要： When manufacturing an electrode for an electrolytic capacitor, in a first hydration step (ST1), an aluminum electrode is immersed in a first hydration processing solution having a temperature of at least 70° C. and comprising pure water or an aqueous solution to which phosphoric acid or a phosphate has been added so that the phosphorus concentration is no greater than 4 mass ppm. In a second hydration step (ST2), the aluminum electrode is immersed in a second hydration processing solution to which phosphoric acid or a phosphate has been added so that the phosphorus concentration is 4-5000 mass ppm, the second hydration processing solution having a pH of 3.0-9.0 and a temperature of at least 70° C. In a chemical conversion step (ST3), at least a boric acid chemical conversion process in which the aluminum electrode is chemically converted in a boric acid-based chemical conversion solution is included, and a chemical conversion coating having a coating withstand voltage of at least 200 V is formed on the aluminum electrode.
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公开(公告)号：US09805876B2
公开(公告)日：2017-10-31
申请号：US14421748
申请日：2013-07-23
发明人： Masahiko Katano , Yuya Yoshida , Yoshihiro Taguchi , Asami Shirai , Yuta Shimizu , Toshifumi Taira , Masashi Mehata
CPC分类号： H01G9/045 , B05D1/18 , B05D3/0254 , B05D5/00 , H01G9/0029 , H01G9/052 , H01G9/0525 , H01G2009/0408
摘要： A porous aluminum electrode has a porous layer formed by sintering aluminum powder on the surface of an aluminum core. The porous aluminum electrode, when subjected to a formation to a voltage of 200V or more, is boiled and then subjected to a first forming process in which formation is performed in an aqueous solution of ammonium adipate at a temperature of 80° C. or below and a second forming process in which formation is performed in a boric acid aqueous solution. When heat depolarization is first carried out, washing with water is performed for five minutes or more before heat depolarization; therefore, the porous layer is not destroyed.
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公开(公告)号：US20150221443A1
公开(公告)日：2015-08-06
申请号：US14421748
申请日：2013-07-23
发明人： Masahiko Katano , Yuya Yoshida , Yoshihiro Taguchi , Asami Shirai , Yuta Shimizu , Toshifumi Taira , Masashi Mehata
CPC分类号： H01G9/045 , B05D1/18 , B05D3/0254 , B05D5/00 , H01G9/0029 , H01G9/052 , H01G9/0525 , H01G2009/0408
摘要： A porous aluminum electrode has a porous layer formed by sintering aluminum powder on the surface of an aluminum core. The porous aluminum electrode, when subjected to a formation to a voltage of 200V or more, is boiled and then subjected to a first forming process in which formation is performed in an aqueous solution of ammonium adipate at a temperature of 80° C. or below and a second forming process in which formation is performed in a boric acid aqueous solution. When heat depolarization is first carried out, washing with water is performed for five minutes or more before heat depolarization; therefore, the porous layer is not destroyed.
摘要翻译： 多孔铝电极具有通过在铝芯表面上烧结铝粉而形成的多孔层。 将多孔铝电极当形成至200V以上的电压时，煮沸，然后进行第一次成型工艺，其中在80℃或更低的温度下在己二酸铵水溶液中进行形成 以及在硼酸水溶液中进行成膜的第二形成工序。 当首先进行热去极化时，在热去极化之前用水洗涤5分钟以上; 因此，多孔层不被破坏。
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公开(公告)号：US11332841B2
公开(公告)日：2022-05-17
申请号：US16483406
申请日：2017-12-07
发明人： Yuta Shimizu , Masahiko Katano , Toshifumi Taira , Shinya Sone
摘要： An electrode holder and a method for producing an electrode for an aluminum electrolytic capacitor are provided that enable prevention of exfoliation of a porous layer during chemical formation even when the porous layer is formed on an aluminum electrode so as to have a thickness of 200 micrometers or greater. When an aluminum electrode 10 having at least one surface 11 on which a porous layer 17 having a thickness of 200 micrometers or greater is formed is subjected to chemical formation in a chemical formation solution, the aluminum electrode 10 is held by an electrode holder 50. The electrode holder 50 includes: an insulating first support plate 51 configured to overlap the one surface 11 of the aluminum electrode 10; an insulating second support plate 52 configured to overlap the other surface 12 of the aluminum electrode 10; and a connecting part 53 configured to connect the first support plate 51 and the second support plate 52 to each other. A portion of the first support plate 51 that overlaps the porous layer 17 while being in contact therewith is formed with a porous member 510.
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公开(公告)号：US11309137B2
公开(公告)日：2022-04-19
申请号：US16483407
申请日：2017-12-07
发明人： Yuta Shimizu , Shuhei Enoki , Masahiko Katano , Toshifumi Taira , Kazuya Fujimoto , Shinya Sone
摘要： An electrode for an aluminum electrolytic capacitor and a method for producing the same are provided that enable improvement of water resistance of a chemical formation film having a withstand voltage of 400 V or higher.
The electrode for an aluminum electrolytic capacitor is produced by performing a hydration step of bringing the aluminum electrode into contact with a hydration treatment liquid having a temperature of 78° C. to 92° C. to form a hydrated film on the aluminum electrode and a chemical formation step of performing chemical formation at a chemical formation voltage of 400 V or higher in a chemical formation solution having a temperature of 58° C. to 78° C. to form the chemical formation film on the aluminum electrode. In this method, the amount of the hydrated film is made appropriate. In this electrode for an aluminum electrolytic capacitor, the number of voids that are exposed on a cut surface when the chemical formation film is cut is 150 voids/μm2 or smaller, and thus the water resistance thereof is high.-
公开(公告)号：US11094472B2
公开(公告)日：2021-08-17
申请号：US16461792
申请日：2017-10-03
发明人： Yuta Shimizu , Masahiko Katano , Yuya Yoshida , Toshifumi Taira , Shinya Sone
摘要： Provided is a method for producing an electrode for an electrolytic capacitor, the method comprising: a hydration step in which an aluminum electrode is immersed in a hydration treatment solution having a temperature of 80° C. or higher; and a chemical conversion step in which the aluminum electrode is subjected to chemical conversion treatment up to a formation voltage of at least 400 V. The hydration treatment solution contains a hydration inhibitor. The thickness of a hydrated film formed in the hydration step satisfies the following condition, 0.6≤t2/t1≤1, wherein t1 is the average thickness of the hydrated film formed in a depth range of up to 100 μm from the surface of the aluminum electrode, and t2 is the average thickness s of the hydrated film formed in a deep portion at least 100 μm from the surface of the aluminum electrode.
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公开(公告)号：US12027321B2
公开(公告)日：2024-07-02
申请号：US16977255
申请日：2019-01-16
发明人： Yuta Shimizu , Masahiko Katano , Toshifumi Taira , Kazuya Fujimoto , Shinya Sone
CPC分类号： H01G9/0029 , H01G9/032 , H01G9/045 , H01G9/048
摘要： In production of an electrode for an aluminum electrolytic capacitor, a hydrated film is formed onto an aluminum electrode including a porous layer by immersing the aluminum electrode into a first hydration treatment liquid having a temperature of 80° C. or more in a first hydration treatment step (ST1) and thereafter the aluminum electrode is heated in an atmosphere having a temperature of 150° C. or more and 350° C. or less in a dehydration step (ST2). Subsequently, a hydrated film is formed onto the aluminum electrode by immersing the aluminum electrode into a second hydration treatment liquid having a temperature of 80° C. or more in a second hydration treatment step (ST3) and thereafter chemical formation of the aluminum electrode is performed at 400 V or more and further 600 V or more in a chemical formation step.
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