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Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium

A technology for electrolytic capacitors and aluminum electrolytic capacitors, applied in electrolytic capacitors, capacitor electrodes, capacitors, etc., can solve the problems of large leakage current, high electrical conductivity of electrolytic capacitors, thermal stability and voltage resistance that are difficult to maintain for a long time

Inactive Publication Date: 2009-03-04
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to maintain the initial high electrical conductivity, thermal stability, and voltage resistance of electrolytic capacitors using this electrolyte for a long period of time.
In addition, electrolytic capacitors using this electrolytic solution have the following problem: when a DC voltage is applied to the electrolytic capacitor, the current that flows after a certain period of time, that is, the leakage current tends to be large.
[0015] On the other hand, boron and aluminum are the same type of element, and in the reaction of aluminum trifluoride similar to boron trifluoride with hydrogen fluoride salt of fluorinated organic onium salt, if hydrogen fluoride is in large excess relative to aluminum, then tetrafluoro In addition to aluminate, hexafluoroaluminate with 6 valence is also generated, so it is not applicable

Method used

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  • Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium
  • Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium
  • Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0245] 1) Fabrication of capacitor elements

[0246] As the anode foil, an aluminum foil obtained by enlarging the surface of an aluminum foil with a thickness of 120 μm and a purity of 99.9% by electrolytic etching, and then forming a dielectric made of aluminum oxide on the surface by anodizing at a chemical conversion voltage of 160 V was used. And cut into 190mm × 13.5mm.

[0247] As the cathode foil, an aluminum foil obtained by subjecting an aluminum foil having a thickness of 30 μm and a purity of 99.9% to a surface-expanding process by electrolytic etching and then cutting into 200 mm×13.5 mm was used.

[0248] As the separator, Manila paper cut into 218 mm×150 mm and having a thickness of 52 μm was used.

[0249] Such as figure 1 As shown, a separator 3 is placed between the anode foil 1 and the cathode foil 2, crimped, and fixed with an adhesive tape for fixing the capacitor element, wherein, the anode foil 2 is welded with a wire 4 installed by a fastening method ...

Embodiment 2

[0268] Carry out the drying of capacitor element under normal pressure, and in the atmosphere that relative humidity is 40%, carry out the cooling of capacitor element and the making of aluminum electrolytic capacitor, except this, carry out similarly with embodiment 1, make aluminum electrolytic capacitor, and evaluate. The collection results are shown in Table 1.

Embodiment 3

[0276] 1) Fabrication of capacitor elements

[0277] As the anode foil, an aluminum foil obtained by expanding the surface of an aluminum foil with a thickness of 120 μm and a purity of 99.9% by electrolytic etching, and then undergoing an anodic oxidation treatment with a chemical conversion voltage of 160 V in an aqueous solution of ammonium adipate to form The dielectric consisted of alumina and was cut to 190mm x 13.5mm.

[0278] As the cathode foil, an aluminum foil obtained by subjecting an aluminum foil having a thickness of 30 μm and a purity of 99.9% to a surface-expanding process by electrolytic etching and then cutting into 200 mm×13.5 mm was used.

[0279] As the separator, Manila paper cut into 218 mm×150 mm and having a thickness of 52 μm was used.

[0280] 2) Preparation of electrolyte

[0281] 25 parts by weight of dry 1-ethyl-2,3-dimethylimidazolinium tetrafluoroaluminate was dissolved in 75 parts by weight of low-moisture grade γ-butyrolactone, and this sol...

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Abstract

There are provided an aluminum electrolytic capacitor comprising an anode, a cathode comprising aluminum and an electrolytic solution containing an onium salt of fluorine-containing anion, wherein the electrolytic solution has a water concentration of 1% by weight or less, or wherein the cathode has a peak top of Al2p spectrum of 74.0 to 75.8 eV as measured by a method in which the surface of the cathode in the aluminum electrolytic capacitor heated at 125 DEG C. for 50 hours is analyzed by X-ray photoelectron spectroscopy (XPS); an electrolytic solution for electrolytic capacitor comprising a quaternary cyclic amidinium tetrafluoroaluminate and a solvent and containing specific impurity compounds in a total amount of 0.6% by weight or less, and an electrolytic capacitor using the electrolytic solution; and a method for preparing an organic onium tetrafluoroaluminate which is advantageously m used in an aluminum electrolytic capacitor.

Description

technical field [0001] The present invention relates to an electrolytic capacitor and an electrolytic solution for the electrolytic capacitor, in particular to an aluminum electrolytic capacitor and an electrolytic solution for the aluminum electrolytic capacitor. [0002] Moreover, this invention relates to the manufacturing method of the tetrafluoroaluminate of an organic onium. Tetrafluoroaluminate of organic onium is a useful chemical substance used in a wide range of fields, such as surfactants; related mobile catalysts; softening agents; antistatic agents for detergents, etc.; dispersants for asphalt, cement, etc.; preservatives; anti-caking agents for fertilizers or granules; anti-aggregating agents, etc. In particular, it can be used as an electrolyte for electrochemical elements such as batteries and electrolytic capacitors. Background technique [0003] Aluminum electrolytic capacitors have the characteristics of small size and large electrostatic capacity, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/035H01G9/04H01G9/14
Inventor 武田政幸宫内博夫宇惠诚
Owner MITSUBISHI RAYON CO LTD
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