Sintered aluminum electrolytic capacitor ultrahigh-voltage anode foil and preparation method thereof

A technology for aluminum electrolytic capacitors and anode foils, applied in electrolytic capacitors, capacitors, circuits, etc., can solve problems such as the difficulty in increasing the surface area of ​​corroded foils, achieve high capacity, save raw materials, and reduce the generation of waste liquid

Active Publication Date: 2020-04-10
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the increase of the expansion ratio of aluminum foil by traditional corrosion process is close to the limit, and it is very difficult to increase the surface area of ​​the corrosion foil, the present invention uses additive manufacturing technology to propose a sintered aluminum electrolytic capacitor ultra-high voltage anode foil and its Preparation method, which is a more environmentally friendly (does not require acid-base corrosion) method for increasing the surface area of ​​the anode foil

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  • Sintered aluminum electrolytic capacitor ultrahigh-voltage anode foil and preparation method thereof
  • Sintered aluminum electrolytic capacitor ultrahigh-voltage anode foil and preparation method thereof
  • Sintered aluminum electrolytic capacitor ultrahigh-voltage anode foil and preparation method thereof

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preparation example Construction

[0045] A method for preparing an ultra-high voltage anode foil of a sintered aluminum electrolytic capacitor of the present invention comprises the following steps:

[0046]1) Mix spherical high-purity aluminum powder with a particle size of 0.5-20 μm with solvent and binder to prepare aluminum powder slurry.

[0047] The preparation of aluminum powder slurry requires the use of one or more of water, glycerol, ethylene glycol, terpineol, ketones, and castor oil as solvents, and the use of carboxycellulose, sodium alginate, starch, and vinyl polymers , epoxy resin, carbon nanotubes, graphene, silicone resin, organic fluoropolymer or fluorine resin as a binder;

[0048] 2) The coating method of aluminum powder slurry can be roller coating, spray coating or screen printing. Finally, carry out vacuum drying at 50-150°C to remove the organic or inorganic solvent components in the slurry;

[0049] Under the formation voltage of ultra-high voltage, the grown oxide film is very thic...

Embodiment 1

[0064] 1) The spherical high-purity aluminum powder with a particle size of 0.5 μm is mixed with a solvent and a binder to make an aluminum powder slurry.

[0065] The preparation of aluminum powder slurry requires the use of water as a solvent and carboxycellulose as a binder;

[0066] 2) The coating method of aluminum powder slurry can be roller coating, spray coating or screen printing. The thickness of one side of the coating is 20 μm, and the thickness of the aluminum foil substrate is selected to be 10 μm. After coating, vacuum drying is carried out at 50 ° C. Treatment to remove the organic or inorganic solvent components in the slurry;

[0067] 3) the aluminum foil coated in the previous step according to figure 1 The program set in the sintering process, such as figure 1 shown in;

[0068] First at HT 1 During the process, the aluminum foil is raised from room temperature to 300°C at a rate of 1°C / min. At this time, the temperature is T1, and 1h of HT is carried o...

Embodiment 2

[0079] A method for preparing an ultra-high voltage anode foil of a sintered aluminum electrolytic capacitor of the present invention comprises the following steps:

[0080] 1) The spherical high-purity aluminum powder with a particle size of 5 μm is mixed with a solvent and a binder to make an aluminum powder slurry.

[0081] To prepare aluminum powder slurry, glycerin and ethylene glycol are used as solvents, and carboxycellulose and sodium alginate are used as binders;

[0082] 2) The coating method of aluminum powder slurry can be roller coating, spray coating or screen printing, etc. The thickness of one side of the coating is 40 μm, and the thickness of the aluminum foil substrate is selected to be 15 μm, and vacuum drying is carried out at 80 ° C after coating Treatment to remove the organic or inorganic solvent components in the slurry;

[0083] 3) the aluminum foil coated in the previous step according to figure 1 The program set in the sintering process, such as f...

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Abstract

The invention discloses a sintered aluminum electrolytic capacitor ultrahigh-voltage anode foil and a preparation method thereof. The preparation method comprises the following steps: 1) mixing spherical aluminum powder with a solvent and an adhesive to prepare aluminum powder slurry; 2) selecting an aluminum foil base material, and coating the surface of an anode foil with the aluminum powder slurry, and carrying out vacuum drying treatment after coating; 3) sintering the coated and dried aluminum foil; and 4) performing low-voltage to ultrahigh-voltage anodic oxidation treatment after the sintering process, and obtaining the sintered aluminum electrolytic capacitor anode foil after the final anodic oxidation process. The aluminum powder slurry is prepare from high-purity aluminum powder,the solvent and the adhesive, and the surface of the aluminum foil substrate is uniformly coated with the slurry for sintering under certain conditions, so that the aluminum powder and the aluminum powder and the aluminum powder and the aluminum foil substrate are sintered together to form the three-dimensional porous aluminum foil. The method is simple in process and environmentally friendly, raw materials are saved, and generation of a large amount of acid and alkali waste liquid containing metal ions generated by a traditional corrosion process is avoided.

Description

technical field [0001] The invention belongs to the field of aluminum electrolytic capacitors, and in particular relates to an ultra-high voltage anode foil of a sintered aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors are widely used in household appliances, automotive electronics, industrial control, aerospace and military due to their high capacity per unit volume, strong breakdown resistance, "self-healing" characteristics during work, and low price In the field, it is often used in the circuit for filtering, coupling, bypass timing and energy storage. The capacity of an aluminum electrolytic capacitor is determined by the capacity of the anode foil. In the current traditional process, in order to increase the capacity of the anode foil, it is necessary to perform electrochemical corrosion and chemical conversion treatment on the aluminum foil. [0003] With the continuous development of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/052
CPCH01G9/045H01G9/052H01G9/0525
Inventor 徐友龙杨时伦姚向华
Owner XI AN JIAOTONG UNIV
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