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Etching method of ultra-high-pressure energy storage material

An energy storage material and ultra-high voltage technology, applied in the direction of electrolytic capacitors, capacitors, electrical components, etc., can solve the problems of small corrosion foil holes, easy to block specific volume, etc., achieve fast boost time, overcome small holes, process steps and The effect of parametric science

Active Publication Date: 2015-11-25
新疆广投桂东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention provides a new process for corroding the ultra-high voltage (Vt≥800V) anode foil for aluminum electrolytic capacitors, which overcomes the problems caused by the existing process due to the small and uneven holes of the corroded foil and the easy blockage after formation. Causes the defect of low specific volume, under the premise of obtaining higher pore size and electrostatic specific capacity, it has better mechanical strength and service life

Method used

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Examples

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Embodiment 1

[0040] 1. Preparation of raw material aluminum foil: select the aluminum foil prepared by vacuum annealing at 550°C for 1 hour as the raw material, the cubic texture is ≧96%, and the thickness is 116 μm; the chemical composition of the raw material aluminum foil is shown in Table 1.

[0041] The chemical composition of table 1 raw material aluminum foil (mass fraction, %)

[0042]

[0043] Two, adopt the method of the present invention to prepare corroded foil, comprise the following steps:

[0044] (1) Pretreatment: first soak the raw material aluminum foil in 0.8mol / L sodium hydroxide solution for 60s, control the treatment temperature at 50°C; then soak the aluminum foil in a mixed solution containing 3wt% sulfuric acid and 5wt% phosphoric acid for 120s , control the treatment temperature at 60°C; finally use deionized water to wash the aluminum foil at room temperature for 2 minutes;

[0045] (2) One-level direct-current electrochemical corrosion: place the aluminum fo...

Embodiment 2

[0053] 1. Preparation of raw material aluminum foil: select the aluminum foil prepared by vacuum annealing at 530°C for 1.5h as the raw material, the cubic texture is ≧95%, and the thickness is 110 μm; the chemical composition of the raw material aluminum foil is shown in Table 2.

[0054] The chemical composition of table 2 raw material aluminum foil (mass fraction, %)

[0055]

[0056] Two, adopt the method of the present invention to prepare corroded foil, comprise the following steps:

[0057] (1) Pretreatment: first soak the raw material aluminum foil in 1mol / L sodium hydroxide solution for 50s, control the treatment temperature to 455°C; then soak the aluminum foil in a mixed solution containing 5wt% sulfuric acid and 3wt% phosphoric acid for 150s, Control the treatment temperature at 50°C; finally use deionized water to wash the aluminum foil at room temperature for 3 minutes;

[0058] (2) First-level direct current electrochemical corrosion: place the aluminum foil...

Embodiment 3

[0066] 1. Preparation of raw material aluminum foil: select the aluminum foil prepared by vacuum annealing at 580°C for 0.5h as the raw material, with a cubic texture ≥ 95% and a thickness of 120 μm; the chemical composition of the raw material aluminum foil is shown in Table 3.

[0067] The chemical composition of table 3 raw material aluminum foil (mass fraction, %)

[0068]

[0069] Two, adopt the method of the present invention to prepare corroded foil, comprise the following steps:

[0070] (1) Pretreatment: first soak the raw material aluminum foil in 0.5mol / L sodium hydroxide solution for 80s, control the treatment temperature at 60°C; then soak the aluminum foil in a mixed solution containing 2wt% sulfuric acid and 8wt% phosphoric acid for 60s , control the treatment temperature to 70°C; finally use deionized water to wash the aluminum foil at room temperature for 2 minutes;

[0071] (2) One-level direct-current electrochemical corrosion: place the aluminum foil tr...

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Abstract

The invention discloses an etching method of an ultra-high-pressure energy storage material. The ultra-high-pressure energy storage material is an anode foil for an aluminum electrolytic capacitor of which Vt is greater than or equal to 800V; and the etching method comprises the following steps: pretreatment, first-stage direct-current electrochemical etching, primary middle treatment, a second-stage direct-current electrochemical etching, secondary middle treatment, a third-stage direct-current electrochemical etching and post-treatment. Through improvement of an etching process, an etched mixed solution formula, chemical compositions of a raw material aluminum foil, an annealing process and the like, the produced aluminum foil can meet the requirements of ultra-high-pressure formation of which the Vt is greater than or equal to 800V; the defect that etched foil holes are easily blocked after being formed due to small size and nonuniformity, so that the specific volume is low in an existing technology is overcome; the energy storage material has relatively good mechanical strength and service life under the premise that relatively large aperture and electrostatic specific volume are obtained; and meanwhile, the produced formed foil is good in stability, low in leakage current and short in pressure rising time.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolytic capacitor anode foil manufacturing, and in particular relates to a method for corroding ultra-high voltage anode foil for aluminum electrolytic capacitors. Background technique [0002] Ultra-high voltage aluminum electrolytic capacitors are widely used in fields and industries such as aerospace, automotive inverters, and industrial inverters because of their high voltage, high energy storage, fast charging and discharging, and low heat generation. The core key technology of ultra-high voltage aluminum electrolytic capacitors lies in the corrosion formation process of anode foil. In the past, only a few enterprises in the world such as JCC Company of Japan, STAMA Company of France, and BECROMAL Company of Italy were able to realize large-scale production of high-pressure corrosion formed foil. However, in recent years, my country has made breakthroughs in technical research in this ...

Claims

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Application Information

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IPC IPC(8): H01G9/055C25F3/04C22F1/057
Inventor 杨小飞张传超蔡小宇熊传勇刘继林
Owner 新疆广投桂东电子科技有限公司
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