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Cathode electrode foil for electrolytic capacitor and manufacturing method thereof

A technology of electrolytic capacitors and cathode electrodes, applied in electrolytic capacitors, capacitors, circuits, etc., to achieve the effects of increased strength and toughness, small contact resistance, and good stability

Active Publication Date: 2015-07-22
袁永
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But no matter which method is used, it can only reduce the loss to a certain extent, but cannot completely avoid the loss.

Method used

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  • Cathode electrode foil for electrolytic capacitor and manufacturing method thereof
  • Cathode electrode foil for electrolytic capacitor and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment provides a cathode electrode foil, which is composed of aluminum foil and a functional material layer formed on the surface of the aluminum foil, and is prepared by the following steps:

[0033] (1) Provide aluminum foil with a thickness of 30μm;

[0034] (2) Mix 55% by weight of phenolic resin, 10% by weight of silver powder (maximum particle size of less than 2μm), and 35% by weight of graphite (average particle size of 1μm), add an appropriate amount of butyl acetate into a ball mill to disperse and debond. After filling, check and adjust to prepare a paste that can be applied. The slurry was applied to the upper and lower surfaces of the aluminum foil and dried. After drying, the thickness of the coating film was about 2.5 μm on one side.

[0035] (3) The aluminum foil formed with the coating film obtained in step (2) is placed in a nitrogen-filled protective atmosphere furnace, heated to 550° C., and kept for 2 hours to obtain the cathode electrode foil o...

Embodiment 2

[0037] This embodiment provides a cathode electrode foil, which is composed of copper foil and a functional material layer formed on the surface of the copper foil, and is prepared by the following steps:

[0038] (1) Provide copper foil with a thickness of 30μm;

[0039] (2) Mix 55% by weight of phenolic resin, 10% by weight of silver powder (maximum particle size of less than 2μm), and 35% by weight of graphite (average particle size of 1μm), add an appropriate amount of butyl acetate into a ball mill to disperse and debond. After filling, check and adjust to prepare a paste that can be applied. The slurry was applied to the upper and lower sides of the copper foil and dried. After drying, the thickness of the coating film was approximately 2.5 μm on one side.

[0040] (3) The copper foil formed with the coating film obtained in step (2) is placed in a nitrogen-filled protective atmosphere furnace, heated to 1250°C, and kept for 2 hours to obtain the cathode electrode foil of this...

Embodiment 3

[0042] This embodiment provides a cathode electrode foil, which is composed of aluminum foil and a functional material layer formed on the surface of the aluminum foil, and is prepared by the following steps:

[0043] (1) Provide copper foil with a thickness of 30μm;

[0044] (2) Mix well 55% by weight of phenolic resin, 10% by weight of nickel powder (maximum particle size of less than 2μm), and 35% by weight of graphite (average particle size of 1μm), add an appropriate amount of butyl acetate into a ball mill to disperse and debond. After discharging, inspect and adjust to prepare a slurry that can be coated. The slurry was applied to the upper and lower sides of the copper foil and dried. After drying, the thickness of the coating film was approximately 2.5 μm on one side.

[0045] (3) The copper foil formed with the coating film obtained in step (2) is placed in a nitrogen-filled protective atmosphere furnace, heated to 550° C., and kept for 2 hours to obtain the cathode electr...

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Abstract

The invention relates to a cathode electrode foil for an electrolytic capacitor. The cathode electrode foil for the electrolytic capacitor comprises metal foil and a functional material layer. The functional material layer is formed by carbon atom base bodies, metal particles distributed in the carbon atom base bodies and carbon particles having conducting capability, wherein the carbon atom base bodies are formed on the surface of the metal foil and are of porous net-shaped structures. The invention further relates to a manufacturing method of the cathode electrode foil. The manufacturing method of the cathode electrode foil comprises the steps of adopting resin to serve as a construction material of the carbon atom base bodies, enabling the resin, the metal particles and the carbon particles to be made into slurry, and obtaining the functional material layer by coating, film formation and carbonization. In the polymer solid aluminum electrolytic capacitor, the cathode foil serving as a cathode terminal and a conducting polymer lead capacitance of anode foil out together, and loss of capacitance of the anode foil caused by the volume of the cathode foil defined as infinity in calculation is avoided.

Description

Technical field [0001] The invention relates to a cathode electrode foil of an electrolytic capacitor and a manufacturing method thereof, in particular to a winding type polymer solid aluminum electrolytic capacitor cathode electrode foil and a manufacturing method thereof. Background technique [0002] For a long time, aluminum foil has been widely used as the cathode material of capacitors, and the application of traditional capacitor aluminum foil materials to winding polymer solid capacitors has also achieved good results. [0003] The wound polymer solid aluminum electrolytic capacitor includes two electrodes: an anode and a cathode. Among them, the anode material generally uses high-purity aluminum foil. In order to increase the capacity per unit area, the surface is electrochemically corroded to increase the surface area, and then a specific voltage is applied to form an oxidation with a specific thickness and pressure resistance on the surface. Aluminum layer, aluminum as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01G9/045
Inventor 袁永宋文汇
Owner 袁永
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