Carbon/aluminum composite cathode foil for solid aluminum electrolytic capacitor and preparation method thereof

An aluminum electrolytic capacitor, aluminum composite technology, applied in solid electrolytic capacitors, electrolytic capacitors, capacitors and other directions, can solve the problems of low specific capacitance, complex preparation process, safety and environmental protection, etc. Simple, long-lasting effects

Inactive Publication Date: 2010-12-22
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is relatively complicated, and heat treatment must be carried out in a specific atmosphere, which has safety and environmental protection problems, and the specific capacitance of the prepared electrode material is not very high. Through the sample detection of Toyo Aluminum Co., Ltd. in Japan, the comparison Capacitance at 200μF / cm 2 about

Method used

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  • Carbon/aluminum composite cathode foil for solid aluminum electrolytic capacitor and preparation method thereof
  • Carbon/aluminum composite cathode foil for solid aluminum electrolytic capacitor and preparation method thereof
  • Carbon/aluminum composite cathode foil for solid aluminum electrolytic capacitor and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0019] A carbon / aluminum composite cathode foil for solid aluminum electrolytic capacitors and a preparation method thereof: the mass ratio of conductive carbon black, triolein, paraffin and absolute ethanol is 1: (0.0001-0.001): (0.01-0.05 ): (50-100) for batching, first mix the conductive carbon black, triolein and paraffin wax, then add absolute ethanol and stir to make a slurry.

[0020] The prepared slurry is evenly coated on the surface of the pretreated aluminum foil by a coating method, and the thickness of the carbon layer after drying is 10-20 μm. Put the aluminum foil coated with the slurry into the vacuum furnace, and when the vacuum degree is 10 -2 ~10 -1 Pa and temperature are kept at 300-450° C. for 20-40 hours, and naturally cooled to room temperature in a vacuum furnace to prepare a carbon / aluminum composite cathode foil for a solid aluminum electrolytic capacitor.

[0021] The specific capacitance of the carbon / aluminum composite cathode foil for solid alum...

Embodiment 2

[0023] A carbon / aluminum composite cathode foil for solid aluminum electrolytic capacitors and a preparation method thereof: the mass ratio of conductive carbon black, carbon black dispersant, polyvinyl alcohol and water is 1: (0.001-0.005): (0.05-0.1) : (10-100) for batching, first mix the conductive carbon black, carbon black dispersant and polyvinyl alcohol, then add water and stir to make a slurry.

[0024] The prepared slurry is evenly coated on the surface of the pretreated aluminum foil by a spraying method, and the thickness of the carbon layer after drying is 20-30 μm. Then put the aluminum foil coated with the slurry into the vacuum furnace, at a vacuum of 10 -3 ~10 -2 Pa and temperature at 450-550°C for 15-30 hours, naturally cooled to room temperature in a vacuum furnace, then out of the furnace, and at 100-200°C and normal pressure for 0.5-3 hours to prepare carbon for solid aluminum electrolytic capacitors / Aluminum composite cathode foil.

[0025] The specif...

Embodiment 3

[0027] A carbon / aluminum composite cathode foil for solid aluminum electrolytic capacitors and a preparation method thereof: the mass ratio of conductive carbon black, potassium salt dispersant, epoxy resin and toluene is 1: (0.0001-0.001): (0.01-0.05): (10-50) For batching, firstly mix conductive carbon black, potassium salt dispersant and epoxy resin, then add toluene and stir to make a slurry.

[0028] The prepared slurry is evenly coated on the surface of the pretreated aluminum foil by dipping and pulling method, and the thickness of the carbon layer after drying is 20-30 μm. Then put the aluminum foil coated with the slurry into the vacuum furnace, at a vacuum of 10 -2 ~10 -1 The Pa and temperature are kept at 630-660° C. for 1-15 hours, and naturally cooled to room temperature in a vacuum furnace to prepare a carbon / aluminum composite cathode foil for a solid aluminum electrolytic capacitor.

[0029] The specific capacitance of the carbon / aluminum composite cathode fo...

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Abstract

The invention relates to a carbon/aluminum composite cathode foil for a solid aluminum electrolytic capacitor and a preparation method thereof. The technical scheme is as follows: carrying out proportioning according to that the weight ratio of conductive carbon black: dispersant: organic binder: solvent is 1: (0.0001-0.05): (0.01-1): (10-1000), firstly mixing the conductive carbon black, the dispersant and the organic binder, further adding the solvent, uniformly stirring and mixing, and preparing into slurry; uniformly coating the prepared slurry on the surface of an aluminum foil after pretreatment, then placing the aluminum foil coated with the slurry into a vacuum furnace, keeping the temperature for 1-40h under the conditions that the vacuum degree is 10-4-10-1Pa and the temperature is 300-660 DEG C, naturally cooling to room temperature in the vacuum furnace, and directly preparing the carbon/aluminum composite foil for the solid aluminum electrolytic capacitor or preparing the carbon/aluminum composite foil for the solid aluminum electrolytic capacitor after activation treatment. The process is simple and the preparation process is safe and environment-friendly; and the prepared product has the characteristics of high specific capacitance, good stability, high carbon/aluminum interfacial binding force and long service life.

Description

technical field [0001] The invention belongs to the technical field of carbon / aluminum composite cathode foil, and in particular relates to a carbon / aluminum composite cathode foil for a solid aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] Since the liquid aluminum electrolytic capacitor is used in a high temperature environment, the tolerance of the electrolyte is not good, and it is prone to leakage and explosion, which affects the reliability of the liquid electrolytic capacitor. Aiming at the problems existing in liquid aluminum electrolytic capacitors, solid aluminum electrolytic capacitors have been developed. Solid aluminum electrolytic capacitors use solid organic semiconductor materials and conductive polymer materials as electrolytes. Solid aluminum electrolytic capacitors have lower ESR (equivalent series resistance) and better stability over time than traditional liquid aluminum electrolytic capacitors. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/15
Inventor 潘应君
Owner WUHAN UNIV OF SCI & TECH
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