Electrolyte for driving electrolytic capacitor and electrolytic

Details Electrolyte for driving electrolytic capacitor and electrolytic Electrolyte for driving electrolytic capacitor and electrolytic

1997-05-02

1998-07-07

Bell, Bruce F.

Compositions

Electrolytes for electrical devices

361503, 361504, 361505, 361506, 429194, 429197, 429198, 429203, 429204, H01G 9022

Patent

active

057763585

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/JP96/00473 filed Feb. 29, 1996.


TECHNICAL FIELD

The present invention relates to an electrolyte for driving electrolytic capacitor used in an aluminum electrolytic capacitor, and an electrolytic capacitor using the same.


BACKGROUND ART

Generally, an electrolyte for driving an electrolytic capacitor used in an aluminum electrolytic capacitor is known to be an electrolyte for driving electrolytic capacitor using an organic compound such as gamma-butyrolactone or ethylene glycol as main solvent in which solutes are dissolved, such as boric acid, other inorganic acid, adipic acid, azelaic acid, butyl octane diacid (Japanese Patent Publication 60-13293), 5,6-decane dicarboxylic acid (Japanese Patent Publication 63-15738), dibasic acid having side chain (Japanese Laid-open Patent 1-45539), other dibasic acid, and their salts.
In such electrolytes for driving electrolytic capacitor, since the spark generation voltage and chemical conversion factor are not enough, and when used in an electrolytic capacitor, it may cause troubles such as short puncture due to aging. It has been therefore attempted to solve the problems by adding polyethylene glycol (Japanese Patent Publication 3-76776) or polyglycerin (Japanese Laid-open Patent 2-194611), thereby enhancing the spark generation voltage.
Such compounds have the advantage of increasing the effect of heightening the spark generation voltage as the amount of addition and molecular weight are larger, but solubility in organic solvent, especially at low temperature, is lowered, and precipitation occurs, there arises a limit for selection of amount of addition and molecular weight. It is better to use these compounds at molecular weight of 1000 or less for the sake of precipitation at low temperature. In such range of molecular weight, however, it is not enough to raise the spark generation voltage, and there is a contradictory problem of inducing short puncture at the time of product aging.
Or, when such compounds are composed so as to increase in the amount of addition and molecular weight, precipitation at low temperature may be prevented by adding sufficient water to the electrolyte for driving electrolytic capacitor. In the electrolyte for driving electrolytic capacitor with sufficient addition of water, however, the vapor pressure in the aluminum electrolytic capacitor is raised due to the effect of water, and it is hard to use at 100.degree. C. or higher temperature.
These compounds are more likely to crystallize as the molecular weight increases, and if solidified in wax form, it causes a serious difficulty in working efficiency in mass production.


DISCLOSURE OF THE INVENTION

The invention is intended to solve the problems of the prior art, and it is hence a primary object thereof to present an electrolyte for driving an electrolytic capacitor capable of sufficiently heightening the spark generation voltage and chemical conversion character of formed oxidation film, not precipitating even at low temperature, and an electrolytic capacitor using the same.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a characteristic diagram showing chemical conversion factor of formed oxide film of an electrolyte for driving electrolytic capacitor in an embodiment of the invention and an electrolyte for driving electrolytic capacitor in prior art, and FIG. 2 is a perspective view showing an element portion of an aluminum electrolytic capacitor.


BEST MODES OF CARRYING OUT THE INVENTION

The invention relates to an electrolyte for driving electrolytic capacitor prepared by using a solvent mainly composed of an organic compound, and dissolving one or more solutes selected from the group consisting of inorganic acids and organic acids, more specifically adding and dissolving at least one of copolymers of polyethylene glycol and polypropylene glycol shown in formulas (1) and (2), or both of the copolymers of polyethylene glycol and polypropylene glycol shown in formulas (1) and (2) simultaneously, and an electrolytic capacitor using the same.

REFERENCES:
patent: 5177673 (1993-01-01), Nagara et al.
patent: 5485346 (1996-01-01), Kanbara et al.

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