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A corrosion method for ultra-high pressure energy storage materials

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 easy clogging specific volume, small holes in corroded foil, etc., to overcome small holes, fast boost time, and good mechanical strength and the effect of service life

Active Publication Date: 2017-10-31
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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  • A corrosion method for ultra-high pressure energy storage materials
  • A corrosion method for ultra-high pressure energy storage materials
  • A corrosion method for ultra-high pressure energy storage materials

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, with a cubic texture ≥ 96% and a thickness of 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 foil...

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, with a cubic texture ≥ 95% and a thickness of 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 t...

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 a method for corroding an ultra-high-voltage energy storage material. The ultra-high-voltage energy storage material is an anode foil for an aluminum electrolytic capacitor with a Vt≥800V. The corrosion method includes the following steps: pretreatment→first-level DC electrochemical corrosion→ Primary secondary treatment → secondary direct current electrochemical corrosion → secondary secondary treatment → tertiary direct current electrochemical corrosion → post-treatment. After the improvement of the corrosion process, the formulation of the corrosion mixed solution, the chemical composition of the raw material aluminum foil, and the annealing process, etc., the aluminum foil produced by the present invention can not only meet the requirements of Vt≥800V ultra-high pressure formation, but also overcome the problems caused by corrosion of foil in the existing process. The pores are small and uneven, and they are easy to block after formation, resulting in low specific volume defects. On the premise of obtaining higher pore size and electrostatic specific volume, they have better mechanical strength and service life; at the same time, the produced formed foil is more stable. Good, low leakage current, fast boost 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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Patent Type & Authority Patents(China)
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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