Aluminum Plate For Aluminum Electrolytic Capacitor Electrode, Aluminum Electrolytic Capacitor, and Method For Manufacturing Aluminum Electrolytic Capacitor

An aluminum electrolytic capacitor wherein a capacitor anode in which a dielectric film and a solid electrolyte layer are formed on at least the etching surface of an aluminum plate, and an anode lead that is electrically connected to the capacitor anode, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a total content of crystallized or precipitated Fe of 1 to 50% of the original Fe content;
• the capacitor anode is formed by etching the aluminum plate having a thickness of 0.2 to 1 mm so as to leave a core part having an average thickness of 50 to 150 μm in the central portion in the thickness direction;
• and
• the anode lead is joined to a lateral face of the core part.

An aluminum electrolytic capacitor wherein a capacitor anode in which a dielectric film and a solid electrolyte layer are formed on at least the etching surface of an aluminum plate, and an anode lead that is electrically connected to the capacitor anode, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a total content of crystallized or precipitated Fe of 1 to 15 ppm;
• the capacitor anode is formed by etching the aluminum plate having a thickness of 0.2 to 1 mm so as to leave a core part having an average thickness of 50 to 150 μm in the central portion in the thickness direction;
• and
• the etching is performed over the entirety of the front and back surfaces of the capacitor anode.

An aluminum electrolytic capacitor wherein a capacitor anode in which a dielectric film and a solid electrolyte layer are formed on at least the etching surface of an aluminum plate, and an anode lead that is electrically connected to the capacitor anode, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a total content of crystallized or precipitated Fe of 1 to 15 ppm;
• the capacitor anode is formed by etching the aluminum plate having a thickness of 0.2 to 1 mm so as to leave a core part having an average thickness of 50 to 150 μm in the central portion in the thickness direction;
• and
• the anode lead is joined to a lateral face of the core part.

An aluminum electrolytic capacitor wherein a capacitor anode in which a dielectric film and a solid electrolyte layer are formed on at least the etching surface of an aluminum plate, and an anode lead that is electrically connected to the capacitor anode, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a cube orientation content of 80% or more;
• the capacitor anode is formed by etching the aluminum plate having a thickness of 0.2 to 1 mm so as to leave a core part having an average thickness of 50 to 150 μm in the central portion in the thickness direction;
• and
• the etching is performed over the entirety of the front and back surfaces of the capacitor anode.

An aluminum electrolytic capacitor wherein a capacitor anode in which a dielectric film and a solid electrolyte layer are formed on at least the etching surface of an aluminum plate, and an anode lead that is electrically connected to the capacitor anode, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a cube orientation content of 80% or more;
• in the formation of the capacitor anode, the aluminum plate, which has a thickness of 0.2 to 1 mm, is etched so as to leave a core part having an average thickness of 50 to 150 μm in the central portion in the thickness direction;
• and
• the anode lead is joined to a lateral face of the core part.

A method for manufacturing an aluminum electrolytic capacitor in which a capacitor anode is formed by performing anodic oxidation on an aluminum plate, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a total content of crystallized or precipitated Fe of 1 to 50% of the original Fe content;
• alternating-current etching is performed and the surface area of the aluminum plate, which has a thickness of 0.2 to 1 mm, is enlarged so that a core part having an average thickness of 50 to 150 μm is left in the central portion in the thickness direction;
• anodic oxidation is subsequently performed;
• the aluminum plate is cut after the anodic oxidation;
• and
• the capacitor anode is formed having the entirety of the front and back surfaces subjected to the alternating-current etching and the anodic oxidation.

A method for manufacturing an aluminum electrolytic capacitor in which a capacitor anode is formed by performing anodic oxidation on an aluminum plate, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a total content of crystallized or precipitated Fe of 1 to 15 ppm;
• and
• alternating-current etching is performed and the surface area of the aluminum plate, which has a thickness of 0.2 to 1 mm, is enlarged so that a core part having an average thickness of 50 to 150 μm is left in the central portion in the thickness direction;
• anodic oxidation is subsequently performed;
• the aluminum plate is cut after the anodic oxidation;
• and
• the capacitor anode is formed having the entirety of the front and back surfaces subjected to the alternating-current etching and the anodic oxidation.

A method for manufacturing an aluminum electrolytic capacitor in which a capacitor anode is formed by performing anodic oxidation on an aluminum plate, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a cube orientation content of 80% or more;
• and
• direct-current etching is performed and the surface area of the aluminum plate, which has a thickness of 0.2 to 1 mm, is enlarged so that a core part having an average thickness of 50 to 150 μm is left in the central portion in the thickness direction;
• anodic oxidation is subsequently performed;
• the aluminum plate is cut after the anodic oxidation;
• and
• the capacitor anode is formed having the entirety of the front and back surfaces subjected to the direct-current etching and the anodic oxidation.

A method for manufacturing an aluminum electrolytic capacitor in which a capacitor anode is formed by performing anodic oxidation on an aluminum plate, wherein

• the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a cube orientation content of 80% or more;
• and
• direct-current etching is performed and the surface area of the aluminum plate, which has a thickness of 0.2 to 1 mm, is enlarged so that a core part having an average thickness of 50 to 150 μm is left in the central portion in the thickness direction;
• anodic oxidation is subsequently performed;
• and
• the capacitor anode is formed.