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Preparation method of dielectric film of aluminum electrolytic capacitor

A technology for aluminum electrolytic capacitors and electrolytic capacitors, applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve the problems of poor thermal stability, existence safety, and difficulty in using the electrolyte of electrolytic capacitors, etc., and achieves simple and easy preparation methods, good The effect of wide temperature range and liquid temperature range

Inactive Publication Date: 2006-07-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the molecular weight of carboxylic acid increases, it becomes difficult to dissolve in solvents such as ethylene glycol. In addition, if high molecular weight carboxylic acid is used as the main solute, although the withstand voltage of the electrolyte can be improved, its conductivity It is difficult to increase the withstand voltage and conductivity at the same time
There are also borate or phosphate solutions added as active substances in the electrolytic solution, and citric acid or tartaric acid and its salt solution are added as complexing agents, but the high temperature performance and voltage resistance of the formed aluminum electrolytic capacitor Not high [Wu Wei, Chinese patent, application number: 03139816.2, publication number: CN1484259A]
Currently, in Li-ion batteries, LiBF 4 、LiPF 6 When used in the electrolyte of lithium-ion secondary batteries, it can form a passivation film on the surface of aluminum, but its withstand voltage is low (Liao Hongying, Cheng Baoying, Lithium-ion battery electrolyte, new material industry, 09, 2003; Yu Bitao, Li Fushen, lithium Research progress of new electrolyte lithium salt for ion battery, battery, 06, 2004), it is difficult to use as electrolyte of electrolytic capacitor
In addition, this type of electrolyte is flammable in case of fire and has poor thermal stability, which poses a safety hazard in actual use.

Method used

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  • Preparation method of dielectric film of aluminum electrolytic capacitor
  • Preparation method of dielectric film of aluminum electrolytic capacitor
  • Preparation method of dielectric film of aluminum electrolytic capacitor

Examples

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Effect test

Embodiment 1

[0025] Anode foil in ionic liquid 1-ethyl-3-methyl-imidazolium tetrafluoroborate (referred to as EMI-BF 4 ) in the preparation method of forming dielectric film

[0026] (1) Pretreatment of the anode foil: the anode foil of the electrolytic capacitor is made of polycrystalline aluminum foil, the thickness of the aluminum foil is 0.1mm, and the purity is 99.9%. -1 NaOH, deionized water, 0.5mol·L -1 Soak in nitric acid and deionized water for 60 seconds in sequence, and the conductivity of deionized water is 0.06×10 -4 S m -1 Next, in order to remove moisture, rinse with methanol for 10 seconds to obtain a pretreated anode foil;

[0027] (2) Anode polarization of the anode foil: put the pretreated anode foil into a glove box, assemble a closed electrolytic cell, and the electrolyte is an ionic liquid 1-ethyl-3-methyl-imidazolium tetrafluoroborate (EMI- BF 4 ), its structural formula is as above table, the water content is 28ppm, the reference electrode is Ag / AgCl electrode,...

Embodiment 2

[0030] Anode foil in ionic liquid 1-propyl-3-methyl-imidazolium tetrafluoroborate (PMI-BF 4 ) in the preparation method of forming dielectric film

[0031] (1) Pretreatment of the anode foil: the anode foil of the electrolytic capacitor is made of polycrystalline aluminum foil, the thickness of the aluminum foil is 0.1mm, and the purity is 99.9%.-1 NaOH, deionized water, 0.5mol·L -1 Soak in nitric acid and deionized water for 60 seconds in sequence, and the conductivity of deionized water is 0.06×10 -4 S m -1 Next, rinse with methanol for 10 seconds to remove water to obtain pretreated anode foil;

[0032] (2) Anode polarization of the anode foil: put the pretreated anode foil into a glove box, assemble a closed electrolytic cell, and the electrolyte is ionic liquid 1-propyl-3-methyl-imidazole tetrafluoroborate (PMI- BF 4 ), its structural formula and water content are shown in the above table, the reference electrode is Ag / AgCl electrode, and the counter electrode is Pt e...

Embodiment 3

[0034] Anode foil in ionic liquid 1-butyl-3-methyl-imidazolium tetrafluoroborate (BMI-BF 4 ) in the preparation method of forming dielectric film

[0035] (1) Pretreatment of the anode foil: the anode foil of the electrolytic capacitor is made of polycrystalline aluminum foil, the thickness of the aluminum foil is 0.1mm, and the purity is 99.9%. -1 NaOH, deionized water, 0.5mol·L -1 Soak in nitric acid and deionized water for 60 seconds in sequence, and the conductivity of deionized water is 0.06×10 -4 S m -1 Next, rinse with methanol for 10 seconds to remove water to obtain pretreated anode foil;

[0036] (2) Anode polarization of the anode foil: put the pretreated anode foil into a glove box, assemble a closed electrolytic cell, and the electrolyte is ionic liquid 1-butyl-3-methyl-imidazole tetrafluoroborate (EMI- BF 4 ), its structural formula and water content are shown in the above table, the reference electrode is Ag / AgCl electrode, and the counter electrode is Pt e...

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Abstract

The invention relates to a method for preparing the dielectric film of aluminum electrolytic capacitor. First, processing pretreatment on the anode foil; processing anode polarization inside the ion liquid to attain the dielectric film. The invention has better corrosive resistance, and its voltage resistance can reach 90V. The invention is easy and clear, and the aluminum electrolytic capacitor made from said invention has high safety and the voltage resistance more than 40V.

Description

technical field [0001] The invention relates to a method for preparing an electrolytic capacitor, in particular to a method for preparing a dielectric film of an aluminum electrolytic capacitor by using an ionic liquid as an electrolyte. Background technique [0002] Electrolytic capacitors are one of the indispensable components in electrical products. Aluminum electrolytic capacitors have been greatly developed in the past two decades due to their excellent performance, low price, and wide application. It is estimated that the output value of aluminum electrolytic capacitors accounts for about 50% of the output value of all types of capacitors. With the development of the production of aluminum electrolytic capacitors, my country's demand for aluminum foil for electrolytic capacitors is also growing rapidly. It is estimated that the demand for it will increase at an average rate of 15% in recent years. The annual demand for aluminum foil is more than 30,000 tons. my count...

Claims

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Application Information

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IPC IPC(8): H01G9/00C25D11/16C25D11/02C25D11/10
Inventor 杨立彭成信立花和宏王保峰章正熙高旭辉
Owner SHANGHAI JIAO TONG UNIV
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