JP2003077766A - Solid electrolytic capacitor and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a large capacity winding type solid electrolytic capacitor exhibiting excellent ESR characteristics and leak current characteristics in high frequency region. SOLUTION: An anode foil 1 on which a dielectric oxide film is formed and at least a cathode foil 2 of an etched aluminium foil are wound while sandwiching a nonwoven fabric separator 3 principally comprising polyphenylene sulfide resin to constitute an element. A solid electrolyte layer 4 comprising at least one kind of polyethylenedioxythiophene, olyethylenedioxythiophene polyethylene sulfonic acid and their derivatives is provided between the anode foil 1 and the cathode foil 2 of the element 10, thus obtaining a solid electrolytic capacitor exhibiting excellent heat resistance, low ESR and high reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound solid electrolytic capacitor used in various electronic devices and a method for manufacturing the same.

[0002]

2. Description of the Related Art With the increase in frequency of electronic equipment, a large-capacity electrolytic capacitor having excellent equivalent series resistance (hereinafter referred to as ESR) characteristics in a high frequency region has been demanded for electrolytic capacitors which are electronic components. There is. Recently, in order to reduce the ESR in the high frequency region, a solid electrolytic capacitor using a solid electrolyte layer such as a conductive polymer having a high electric conductivity has been studied, and in response to the demand for a large capacity. Has a high conductivity due to the winding type (structure in which the anode foil and the cathode foil are wound with a separator interposed between them), which is structurally easy to increase the capacity compared to the case where electrode foils are laminated. Solid electrolytic capacitors using a solid electrolyte layer of molecules have been commercialized.

In the solid electrolytic capacitor having the above-mentioned wound type structure, it is essential to interpose a separator in order to avoid contact between the anode foil and the cathode foil. For this separator, a conventional electrolytic solution is used as an electrolyte. A so-called electrolytic paper made of Manila hemp or kraft paper used for electrolytic capacitors is wound around the capacitor element, and then this electrolytic paper is carbonized by a heating method (hereinafter referred to as carbonized paper) or glass. A fibrous non-woven fabric, a non-woven fabric containing a resin by a dry melt blow method as a main component, and the like are used.

Further, according to the technique disclosed in Japanese Patent Laid-Open No. 10-340829, in the solid electrolytic capacitor, the separator is made of a non-woven fabric mainly composed of synthetic fiber, and the synthetic fiber is vinylon (a resin based on polyvinyl alcohol). It is proposed to be a non-woven fabric composed of (1) and a mixed non-woven fabric containing vinylon as a main component and another resin mixed.

[0005]

However, in the above-mentioned wound-type solid electrolytic capacitor, which uses carbonized paper as a separator, the electrolytic paper is carbonized at 250 ° C.
However, there is a problem that the dielectric oxide film is damaged due to this heating, the leakage current becomes large, and the short-circuit occurrence rate becomes high even if repaired by aging.

Further, the heating causes the plating layer (for example, tin / lead layer) of the lead wire of the solid electrolytic capacitor to be oxidized, and the solder wettability of the lead wire portion of the product after completion is remarkably increased in the ordinary plated wire. Therefore, there is a problem in that an expensive silver-plated lead wire having strong oxidation resistance must be used.

The one using a glass fiber non-woven fabric is
There was a big problem in the work environment due to the scattering of the needle-shaped glass fibers around during cutting and winding, and the strength at the time of bending due to winding was fragile, and the product had a drawback that it was easy to short-circuit. .

Further, a non-woven fabric containing a resin as a main component, a non-woven fabric containing vinylon and a non-woven fabric mixed with another resin containing vinylon as a main component by a dry melt-blowing method have a weaker tensile strength than electrolytic paper, and therefore, a capacitor. The separator is likely to be broken when the element is wound up, the occurrence rate of short circuit during aging is high, and it is difficult to hold the conductive polymer in the separator due to the influence of the adhesive component that bonds the resin fibers together, and the ESR in the high frequency range is high. There is a problem that it is difficult to manufacture a solid electrolytic capacitor having a low electric field.

Further, since vinylon resin has poor heat resistance, it is easily decomposed during use of a solid electrolytic capacitor at high temperature or during high temperature reflow treatment during soldering, and gas is generated to increase the internal pressure, which damages the sealing portion. It has the drawbacks that it is easy to do so and that the electrical characteristics of the solid electrolytic capacitor are easily damaged.

Further, the separator mainly composed of polyester resin has a relatively high melting point of the resin (240 to 260).
Therefore, the temperature of the top surface of the capacitor in the reflow furnace when the capacitor is soldered and mounted on the substrate is
If the temperature is controlled to 0 ° C or less, there will be no problem, but under soldering and mounting conditions at temperatures above 260 ° C (temperatures above the melting point of the resin), the ESR will increase due to the cutting of the separator fiber due to the thermal shrinkage of the resin. Was.

On the other hand, as the conductive polymer used for the solid electrolyte layer, polyethylenedioxythiophene or polypyrrole formed by chemically oxidatively polymerizing ethylenedioxythiophene with an optimum oxidizing agent is known. It is difficult to retain these conductive polymers in a non-woven fabric obtained by a wet method consisting of glass fiber non-woven fabric or polypropylene, and the separator fiber is cut due to resin shrinkage caused by heat stress, short-circuiting of the capacitor or conductivity. There is a problem that the size per capacitance is larger than that of a capacitor using an electrolyte as an electrolyte because of an increase in ESR due to peeling from a polymer and a poor capacity extraction rate.

The present invention solves such conventional problems,
An object of the present invention is to provide a solid electrolytic capacitor having excellent solder heat resistance, low ESR and excellent reliability, and a method for manufacturing the same.

[0013]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention provides an anode foil on which a dielectric oxide film is formed and at least a cathode foil of an etched aluminum foil between them. A device is constructed by winding a non-woven fabric separator mainly composed of polyphenylene sulfide resin in between and winding it, and polyethylenedioxythiophene, polyethylenedioxythiophene polystyrenesulfonic acid and those between the anode foil and the cathode foil of this device. Adhesion and adhesion between a solid electrolyte layer typified by polyethylenedioxythiophene and a non-woven fabric separator containing a polyphenylene sulfide resin. Very good, high capacity extraction rate and high capacity Next, such an action ESR can be further reduced in a high frequency region.

The nonwoven fabric containing the polyphenylene sulfide resin is different from the nonwoven fabric made of other synthetic resin materials in that it does not use an adhesive for bonding the fibers to each other when forming the sheet, and the thermal bonding method or mechanical method is used. The sheet can be formed into a sheet by the entanglement method, and its melting point is also high (300 ° C.), so even under soldering and mounting conditions at a temperature higher than 260 ° C. (range not exceeding the melting point of the polyphenylene sulfide resin), the resin heat It is possible to prevent breakage of the separator fiber and increase of ESR due to shrinkage.

In particular, the nonwoven fabric containing the polyphenylene sulfide resin obtained by the spunbond method is
Compared with the non-woven fabric produced by the dry melt-blowing method which is the same dry method, one fiber length is long and the tensile strength is strong. Therefore, when compared with the same thickness and the same weight, when the capacitor element is wound, the separator breaks up. It is preferable because the frequency is reduced and the short-circuit occurrence rate is also reduced.

According to a second aspect of the present invention, the anode foil having the dielectric oxide film formed thereon and the cathode foil of at least the etched aluminum foil are wound with a non-woven fabric separator mainly composed of polyphenylene sulfide resin interposed therebetween. To form a device, and a conductive polymer layer in which an electronically conductive polymer and a polymer having poor conductivity are mixed between the anode foil and the cathode foil of the device, polyethylenedioxythiophene, polyethylenedioxy A non-woven fabric separator comprising a solid electrolyte layer typified by polyethylenedioxythiophene and a polyphenylene sulfide resin, which is composed of a capacitor element provided with a solid electrolyte layer made of at least one of thiophene polystyrene sulfonic acid and derivatives thereof. The adhesion and adhesion with the conductive polymer layer Can be further enhanced by Nda effect, it becomes a high-capacity high capacity draw-out rate has an effect of ESR can be further reduced in a high frequency region.

According to a third aspect of the invention, in the first or second aspect of the invention, the thickness of the nonwoven fabric separator mainly composed of polyphenylene sulfide resin is 30 to 80.
With a structure in which the weight is in the range of 10 to 60 g / m ² and the tensile strength is sufficient to withstand separator breakage when the capacitor element is wound, a unit with a small diameter capacitor element is also available. The solid electrolytic capacitor has a large capacity per volume, a small resistance between the anode foil and the cathode foil, and can obtain a solid electrolytic capacitor having a low ESR in a high frequency region.

If the weighed amount of the separator is less than 10 g / m ^2, it is not preferable because the separator is frequently broken during winding. If the weighed amount exceeds 60 g / m ² , the ES in the high frequency range is increased.
It is not preferable because R becomes high.

If the thickness is less than 30 μm, it becomes difficult to secure the tensile strength, and if it exceeds 80 μm, the ESR characteristic becomes high, which is not preferable.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the electronically conductive polymer is polypyrrole, polyaniline, sulfonated polyaniline, polythiophene, polyethylenedioxythiophene, polystyrene sulfonic acid, or a compound thereof. The composition is at least one selected from the group consisting of derivatives, and the non-woven fabric separator containing the polyphenylene sulfide resin and the solid electrolyte layer are kept at a constant conductivity to improve the adhesiveness / adhesiveness. This has the effect of reducing the internal resistance of the capacitor.

According to a fifth aspect of the invention, in the second aspect of the invention, the polymer having poor conductivity is polyester or a derivative thereof, and the sixth aspect of the invention is the polyester. A structure in which the derivative is at least one kind of polymer or copolymer selected from the group consisting of glycidyl-modified polyester, sulfonic acid-modified polyester, and carboxylic acid-modified polyester,
With these polymers or copolymers, it is easy to set the resistivity of the conductive polymer to a value exceeding 1.0 × 10 ¹⁰ Ω / □, so that the electron avalanche phenomenon is limited to a local range. Since a conductive polymer having sufficient insulation performance can be constructed, the leakage current is very small and the occurrence of short circuit during aging can be reduced.

According to a seventh aspect of the present invention, an anode foil having a dielectric oxide film formed thereon and a cathode foil of at least an etched aluminum foil are wound with a nonwoven fabric separator containing a polyphenylene sulfide resin interposed therebetween. Thereby forming an element, and then impregnating the element with a solution containing ethylenedioxythiophene and / or a derivative thereof and an oxidant solution containing sulfonic acids individually or with ethylenedioxythiophene and / or a derivative thereof. Manufacturing method of forming a capacitor element by forming a solid electrolyte layer containing polyethylenedioxythiophene or a derivative thereof by impregnating a mixed solution mixed with an oxidizing agent containing sulfonic acids between an anode foil and a cathode foil And a large capacity solid electrolytic capacitor with low ESR in the high frequency region. An effect that can be produced easily and stably the support.

In the invention described in claim 8, the anode foil having the dielectric oxide film formed thereon and the cathode foil of at least the etched aluminum foil are wound with a non-woven fabric separator mainly composed of polyphenylene sulfide resin interposed therebetween. To form a conductive polymer layer, followed by impregnating the device with a mixed solution containing fine particles of an electronically conductive polymer and a polymer having poor conductivity and drying to form a conductive polymer layer. , A solution containing ethylenedioxythiophene and / or a derivative thereof and an oxidizing agent solution containing sulfonic acids are individually impregnated or mixed by mixing ethylenedioxythiophene and / or a derivative thereof and an oxidizing agent containing sulfonic acid. A solid electrolyte layer containing polyethylenedioxythiophene or a derivative thereof is impregnated with the solution. A manufacturing method for forming a capacitor element is formed between the electrode foil and the cathode foil, improving the adhesion and bonding of the nonwoven fabric separator and the solid electrolyte layer containing a polyphenylene sulfide resin, ESR of the high frequency region
And a large capacity solid electrolytic capacitor having a low temperature can be easily and stably manufactured.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 are a partial sectional perspective view showing the structure of the solid electrolytic capacitor of the present invention and an enlarged conceptual view of the essential part of the capacitor element. As shown in FIG. Anode foil 1 made of aluminum foil on which dielectric oxide film 11 is formed by roughening the surface of aluminum foil and cathode foil 2 obtained by at least etching treatment of aluminum foil, with non-woven fabric separator 3 containing polyphenylene sulfide resin interposed. Then, the solid electrolyte layer 4 is formed between the anode foil 1 and the cathode foil 2, and the capacitor element 10 is formed.

The capacitor element 10 is housed in a cylindrical aluminum case 8 having a bottom, and the open end of the aluminum case 8 is led out from the anode foil 1 and the cathode foil 2 by a rubber sealing material 7 for external extraction. The anode lead 5 and the cathode lead 6 are drawn out so as to penetrate through the sealing material and the insulating seat plate 9, and the anode lead 5 and the cathode lead 6 are arranged along the groove on the bottom surface of the insulating seat plate 9. .

Next, specific examples of the embodiment of the present invention will be described, but the present invention is not limited thereto.

(Example 1) An anode foil made of an aluminum foil having a dielectric oxide film (forming voltage of 30 V) formed by anodizing after roughening the surface by etching and a cathode foil obtained by etching the aluminum foil And a non-woven fabric separator obtained by the spunbonding method of polyphenylene sulfide resin (thickness 50 μm, weighing 25
A device was obtained by winding with an interposition of g / m ² ) (a frequency of 120 Hz when this device was impregnated with a 10 wt% ethylene glycol solution of ammonium adipate).
Was 250 μF).

Subsequently, this device was mixed with 1 part of ethylenedioxythiophene which is a heterocyclic monomer and p- which is an oxidizing agent.
After dipping in a solution containing 2 parts of ferric toluenesulfonate and 4 parts of n-butanol, which is a polymerization solvent, and pulling it up, 85
By leaving it at 60 ° C. for 60 minutes, a solid electrolyte layer of polyethylenedioxythiophene, which is a chemically polymerizable conductive polymer, was formed between the anode foil and the cathode foil to obtain a capacitor element.

Subsequently, this capacitor element was washed with water and dried, and then a resin-vulcanized butyl rubber sealing material (consisting of 30 parts of butyl rubber polymer, 20 parts of carbon, and 50 parts of inorganic filler, sealing material hardness: 70 IRHD [International Rubber Hardness Units))
After enclosing it in a bottomed cylindrical aluminum case, the opening is sealed by curling, and both lead terminals led out from the anode foil and cathode foil are passed through an insulating seat plate made of polyphenylene sulfide, and the lead wire A flat mount type solid electrolytic capacitor was produced by bending the part into a flat shape (size: diameter 10 mm × height 8 mm).

(Example 2) In the above Example 1, 1 part of toluethylenedioxythiophene polystyrene sulfonic acid was used as the solid electrolyte layer, and 2 parts of ammonium persulfate was used as the oxidizing agent.
A surface-mounted type solid electrolytic capacitor was produced in the same manner as in Example 1 except that a mixed solvent of 1 part of methanol and 3 parts of water was used as a polymerization solvent.

Example 3 In the above Example 1, before forming the solid electrolyte layer of polyethylenedioxythiophene, fine particles of polyethylenedioxythiophene polystyrenesulfonic acid (average particle size 2
Of the glycidyl-modified polyester having a low conductivity of 3.0% by weight and a concentration of 00 nm) of 1.0% by weight, and the element was dipped in an aqueous solution containing a surfactant and pulled up, and then at 150 ° C. for 5 minutes. A surface-mounting solid was formed in the same manner as in Example 1 except that a conductive polymer layer containing polyethylenedioxythiophene polystyrene sulfonic acid and glycidyl-modified polyester was formed on at least the dielectric oxide film and the separator by performing a drying treatment. An electrolytic capacitor was produced.

Example 4 In Example 1, the concentration of fine particles (average particle size 1000 nm) of the sulfonated modified polyaniline, which is an electronically conductive polymer, was changed before forming the solid electrolyte layer of polyethylenedioxythiophene. 5.0
%, And polyethylene terephthalate, which is poorly conductive, has a concentration of 3.0% by weight, and an aqueous solution containing a surfactant is added to the conductive film containing at least the sulfonated modified polyaniline and polyethylene terephthalate on the dielectric oxide film and the separator. A surface-mounting type solid electrolytic capacitor was produced in the same manner as in Example 1 except that the polymer layer was formed.

Example 5 In Example 1, the concentration of fine particles (average particle size 800 nm) of polypyrrole, which is an electronically conductive polymer, was 3.0 before forming the solid electrolyte layer of polyethylenedioxythiophene. %, And the concentration of polyethylene terephthalate, which has poor conductivity, is 3.0
Example 1 except that a conductive polymer layer containing polypyrrole, which is an electronic conductive polymer, and polyethylene terephthalate was formed on at least the dielectric oxide film and the separator using an aqueous solution in which the weight% and a surfactant were added. Similarly, a surface mount type solid electrolytic capacitor was produced.

Example 6 In Example 1, as a separator, a non-woven fabric separator (thickness) obtained by a spunbond method of a mixed resin of polyphenylene sulfide (20% by weight percentage) and polyethylene terephthalate (80% by weight percentage) was used. 50 μm, weighing 25 g / m ² )
A surface-mounting type solid electrolytic capacitor was produced in the same manner as in Example 1 except that was used.

(Example 7) The same as Example 1 except that a non-woven fabric separator (thickness 30 μm, basis weight 25 g / m ² ) obtained by a wet method of polyphenylene sulfide resin was used as the separator. To produce a surface mount type solid electrolytic capacitor.

(Example 8) In Example 1, as a separator, polyphenylene sulfide resin (80% by weight), polybutylene terephthalate resin (10% by weight), and Manila hemp fiber (5% by weight).
%), Kraft fiber (4% by weight percentage), and vinylon fiber (1% by weight percentage), which was obtained by a wet method using a mixed paper-making nonwoven fabric separator (thickness: 50 μm, weighing: 25 g / m).
^A surface mount type solid electrolytic capacitor was produced in the same manner as in Example 1 except that ² ) was used.

(Embodiment 9) In Embodiment 1, the cathode voltage is 5 times after the aluminum foil is etched.
A surface mount type solid electrolytic capacitor was produced in the same manner as in Example 1 except that the one subjected to chemical conversion treatment with V was used.

(Comparative Example 1) In the above-mentioned Example 1, instead of the polyphenylene sulfide resin separator,
Glass fiber non-woven fabric (thickness 80 μm, weighing 10 g / m ² )
A surface-mounting type solid electrolytic capacitor was produced in the same manner as in Example 1 except that was used.

(Comparative Example 2) In the above-mentioned Example 1, instead of the separator made of polyphenylene sulfide resin,
Melt blown non-woven fabric made of polypropylene (thickness 50
A surface-mounting type solid electrolytic capacitor was produced in the same manner as in Example 1 except that μm, weighing 25 g / m ² ) was used.

(Comparative Example 3) In the above-mentioned Example 1, an electrolytic paper (thickness: 45) made of Manila hemp was placed between the anode foil and the cathode foil.
μm), and wind this element in a nitrogen atmosphere.
A surface mount solid electrolytic capacitor was produced in the same manner as in Example 1 except that the electrolytic paper interposed between the anode foil and the cathode foil was carbonized by heating at 275 ° C. for 2 hours to form a capacitor element.

(Comparative Example 4) In the above-mentioned Example 1, instead of the polyphenylene sulfide resin separator,
A surface-mounted solid electrolytic capacitor was produced in the same manner as in Example 1 except that a non-woven fabric (thickness: 50 μm, weighed: 25 g / m ² ) obtained mainly by a vinylon resin was used.

Examples 1 to 1 of the present invention produced as described above
9 and the solid electrolytic capacitors of Comparative Examples 1 to 4, their capacitance (measurement frequency 120 Hz), ESR (measurement frequency 100 kHz), leakage current (after applying a rated voltage of 16 V, 2
Minute value), the number of short-circuit occurrences (defects) during the aging treatment, and the ESR (measurement frequency 100 kHz) after performing the reflow treatment (peak temperature of 265 ° C., condition of exposure to 200 ° C. or higher for 70 seconds). The results are shown in (Table 1).

[0044]

[Table 1]

The number of tests is 50 in each case.
The capacitance, ESR, leakage current, and capacitance after the reflow treatment are shown as the average value of the samples excluding the short-circuited product.

As is clear from Table 1, since the solid electrolytic capacitors of Examples 1 to 9 of the present invention use the non-woven fabric separator containing the polyphenylene sulfide resin, the adhesion between the solid electrolyte layer and the separator is high. Since the adhesiveness is extremely good, the other separator materials shown in Comparative Example 1 and Comparative Examples 3 and 4 (glass fiber nonwoven fabric in Comparative Example 1, carbonized electrolytic paper in Comparative Example 3, vinylon resin in Comparative Example 4) were used. The ESR in the high frequency region can be made lower than in the case of using a wet non-woven fabric as a main component.

Further, since polyethylene dioxythiophene or polyethylene dioxythiophene polystyrene sulfonate, which is the solid electrolyte layer, can be strongly adhered and adhered to the non-woven fabric separator containing the polyphenylene sulfide resin, there is little change in ESR after the reflow treatment. As a surface mount type solid electrolytic capacitor, reliability can be improved.

A non-woven fabric containing the solid electrolyte layer and the polyphenylene sulfide resin is formed by forming a conductive polymer layer in which an electronically conductive polymer and a polymer having poor conductivity are mixed before forming the solid electrolyte layer. The adhesiveness and adhesiveness with the separator can be further enhanced by the binder effect of the conductive polymer layer, the capacity extraction rate is high and the capacity is high, and the ESR in the high frequency region can be further reduced.

Solid electrolysis using the separators of Comparative Examples 1 to 4 (glass fiber nonwoven fabric in Comparative Example 1, melt blown nonwoven fabric in Comparative Example 2, carbonized electrolytic paper in Comparative Example 3, and wet polypropylene nonwoven fabric in Comparative Example 4). In the capacitor, the short-circuit occurrence rate during the aging process due to the contact between the anode foil and the cathode foil due to the insufficient strength of the separator increases.

[0050]

As described above, the solid electrolytic capacitor of the present invention is formed by winding the anode foil and the cathode foil on which the dielectric oxide film is formed with the non-woven fabric separator containing the polyphenylene sulfide resin interposed therebetween. The device and the solid electrolyte layer provided between the anode foil and the cathode foil of this device have a very good adhesion and adhesiveness between the solid electrolyte layer and the separator. Can have a lower ESR.

Further, since the nonwoven fabric separator containing the polyphenylene sulfide resin can sufficiently secure the strength, the occurrence rate of short circuit and the leakage current during the aging treatment can be suppressed, so that the solid electrolytic capacitor excellent in the ESR characteristic and the leakage current can be obtained. It can be obtained and its industrial value is great.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing a configuration of an electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is an enlarged conceptual diagram of the main part of the capacitor element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Anode foil 2 Cathode foil 3 Nonwoven fabric separator containing polyphenylene sulfide resin 4 Solid electrolyte layer 5 Anode lead 6 Cathode lead 7 Sealing material 8 Aluminum case 9 Insulating seat plate 10 Capacitor element 11 Dielectric oxide film

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshihiro Watanabe             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (8)

[Claims] 1. A device is constructed by winding an anode foil on which a dielectric oxide film is formed and at least an etched aluminum foil cathode foil with a non-woven fabric separator mainly composed of polyphenylene sulfide resin interposed therebetween. A solid electrolytic capacitor comprising a capacitor element in which a solid electrolyte layer made of at least one of polyethylenedioxythiophene, polyethylenedioxythiophene polystyrenesulfonic acid and derivatives thereof is provided between an anode foil and a cathode foil of this element. 2. A device is constructed by winding an anode foil having a dielectric oxide film formed thereon and at least a cathode foil of an etched aluminum foil with a nonwoven fabric separator mainly composed of polyphenylene sulfide resin interposed therebetween. , A conductive polymer layer in which an electronic conductive polymer and a polymer having poor conductivity are mixed between the anode foil and the cathode foil of this device, and polyethylenedioxythiophene, polyethylenedioxythiophene polystyrenesulfonic acid and those A solid electrolytic capacitor comprising a capacitor element provided with a solid electrolyte layer comprising at least one derivative. 3. The solid according to claim 1, wherein the non-woven fabric separator mainly composed of polyphenylene sulfide resin has a thickness of 30 to 80 μm and a basis weight of 10 to 60 g / m ^2. Electrolytic capacitor. 4. The electronically conductive polymer is polypyrrole, polyaniline, sulfonated polyaniline, polythiophene,
The solid electrolytic capacitor according to claim 2, which is at least one selected from the group consisting of polyethylenedioxythiophene, polystyrenesulfonic acid, and derivatives of these compounds. 5. The solid electrolytic capacitor according to claim 2, wherein the polymer having poor conductivity is polyester or its derivative. 6. The solid electrolytic capacitor according to claim 5, wherein the polyester derivative is at least one kind of polymer or copolymer selected from the group consisting of glycidyl-modified polyester, sulfonic acid-modified polyester, and carboxylic acid-modified polyester. . 7. A device is formed by winding an anode foil on which a dielectric oxide film is formed and a cathode foil of at least an etched aluminum foil with a non-woven fabric separator mainly composed of polyphenylene sulfide resin interposed therebetween. Then, the device is individually impregnated with a solution containing ethylenedioxythiophene and / or a derivative thereof and an oxidant solution containing a sulfonic acid or an oxidation containing ethylenedioxythiophene and / or a derivative thereof and a sulfonic acid. A method for producing a solid electrolytic capacitor, wherein a solid electrolyte layer containing polyethylenedioxythiophene or a derivative thereof is formed between an anode foil and a cathode foil by impregnating a mixed solution mixed with an agent to form a capacitor element. 8. A device is formed by winding an anode foil having a dielectric oxide film formed thereon and at least a cathode foil of an etched aluminum foil with a non-woven fabric separator mainly composed of polyphenylene sulfide resin interposed therebetween. Then, this device is impregnated with a mixed solution containing fine particles of an electronically conductive polymer and a polymer having poor conductivity and dried to form a conductive polymer layer, and then ethylenedioxythiophene and / or Alternatively, polyethylene is obtained by individually impregnating a solution containing a derivative thereof and an oxidizing agent solution containing a sulfonic acid or a mixed solution obtained by mixing ethylenedioxythiophene and / or a derivative thereof and an oxidizing agent containing a sulfonic acid. Forming a solid electrolyte layer containing dioxythiophene or its derivative between anode foil and cathode foil And method for producing solid electrolytic capacitor, wherein capacitor element is formed.