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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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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：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：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.
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