KR20000006968A - Method for preparation of solubility polypyrrole electrolyte - Google Patents

Abstract

PURPOSE: A soluble polypyrrole electrolyte for an electrolytic condenser is provided to reduce cost and maintain uniform coating inwardly tantalum. CONSTITUTION: A pyrrole monomer is polymerized with a dopant under existence of an oxidation agent, forming a conductive polypyrrole of macromolecule. The polypyrrole is solved by proton solvent such as alcohol and organic solvent to be used as an electrolyte of the electrolytic condenser. The dopant is one selected from a group consisting of alkyl, isoalkyl, alkoxyl, alkoxyakyl, alkylsulfony, alkoxycarbonyl, alkylsilane, arylsulfonyl, and alkenyl.

Description

Method for preparation of solubility polypyrrole electrolyte for electrolytic capacitors

Capacitors have been used for a limited time in telecommunications, large computers, military business equipments, etc., but recently, due to technology improvements such as miniaturization, thinness, light weight, and automatic mounting, mobile communication devices other than VTR, handphone, and potable electronic devices (notebook, PC) It is widely used in all electronic products that can be found in real life. As a result, the capacitors mounted in these devices require a small size and a large capacity and low impedance in the capacitor field.

Capacitors can be classified into various types according to the type of dielectric used. However, the capacitor which can obtain a small and large capacitance is an electrolytic capacitor. Among the electrolytic capacitors, the advantages of tantalum electrolytic capacitors are small and large capacity (large dielectric constant), low impedance, low loss tan δ, low leakage current and excellent frequency characteristics. In addition, the temperature characteristics are good. (-55 ~ 125 ℃) The service life is semi-permanent, high reliability and strong withstand voltage.

The electrolyte of a tantalum electrolytic capacitor is prepared by applying manganese dioxide (MnO ₂ ) on a heat treated tantalum pellet. Tantalum electrolytic capacitors using manganese dioxide (MnO ₂ ) as an electrolyte have the advantages of being stable in temperature characteristics, high in reliability, and excellent in frequency characteristics, but due to the low electrical conductivity of manganese dioxide (<10 ^-1 S / cm) And low impedance is difficult to achieve. In addition, it has the disadvantage of complexity and energy waste of impregnating tantalum oxide into Mn (NO ₃ ) ₂ solution and pyrolyzing it at 250 ~ 320 ℃ to form manganese dioxide as a solid electrolyte on the inner and outer surfaces of the sintered body. .

Recently, in Japan, research has been conducted to eliminate such disadvantages by coating polypyrrole, a conductive polymer having high electrical conductivity (> 10 S / cm), using electrochemical methods for the past 10 years. More than 100 patents are reported. However, coating using an electrochemical method has a disadvantage in that the process is cumbersome and the film thickness is not uniform. Accordingly, the present invention is to develop an electrolyte of a polypyrrole solution, a conductive polymer, for the development of a tantalum electrolytic capacitor having a large capacity, low impedance, and low equivalent series resistance.

In the present invention, by immersing the oxidized tantalum pellet in a polypyrrole solution, which is a high processability conductive polymer, and uniformly coated up to the pore velocity inside the pellet, a large capacity, low resistance, low impedance, low equivalent series resistance tantalum capacitor device or aluminum capacitor device In order to develop an electrolyte required for the development, etc., an electrolytic capacitor such as a tantalum electrolytic capacitor or an aluminum electrolytic capacitor will be developed.

1 is a tantalum electrolytic capacitor prepared by coating carbon paste and silver paste on oxidized tantalum pellet coated with polypyrrole electrolyte.

2 is an aluminum electrolytic capacitor prepared by coating carbon paste and silver paste on oxidized aluminum pellets coated with polypyrrole electrolyte.

FIG. 3 shows hydrogen bonding between tantalum oxide and polypyrrole solution when polypyrrole is dissolved in t-butylalcohol, a protic solvent, and then immersed in tantalum oxide.

Figure 4 shows the chemical interaction of the oxidized tantalum and the coupling agent, polypyrrole when immersed in oxidized tantalum after addition of the coupling agent Vinyltris (β-methoxysilane) to the polypyrrole solution.

FIG. 5 illustrates chemical interaction between oxidized tantalum, surfactant, and polypyrrole when immersed in oxidized tantalum after addition of an amphoteric surfactant (N-lauryl-β-aminopropinonic acid) to the polypyrrole solution. It was.

Therefore, the present invention describes an electrolyte manufacturing method using tantalum and aluminum which are widely used as an electrolytic capacitor. The preparation of the electrolyte as in the present invention can be prepared using a variety of capacitor devices, but the manufacturing method is the same as the manufacturing method using the tantalum and aluminum devices described above.

In the case of the tantalum capacitor using the electrolyte of the polypyrrole solution according to the present invention, the tantalum element oxidized when using manganese dioxide as the electrolyte of the conventional tantalum capacitor element is impregnated in Mn (NO ₃ ) ₂ liquid and at a high temperature of 250 to 320 ° C. By thermal decomposition, manganese dioxide, a solid electrolyte, is formed on the inside and outside surfaces of the sintered body, which saves a lot of wasted energy. In addition, in the case of synthesizing polypyrrole, which is a conductive polymer as an electrolyte, by electrolytic polymerization, it is not necessary to flow the complexity during set-up and synthesis in the process, thereby greatly saving energy and reproducing resources by reusing materials.

Conventional chemically synthesized polypyrrole (polypyrrole doped with dodecylbenzene sulfonic acid) electrolyte has lower electrical conductivity than polypyrrole electrolyte synthesized by electropolymerization, so low impedance and high capacitance have been produced in tantalum electrolytic capacitors. Not showing. In addition, the conventional chemically synthesized polypyrrole (polypyrrole doped with dodecylbenzene sulfonic acid) electrolyte has a disadvantage in that it is difficult to process because there is no solubility in alcohol, an environmentally friendly solvent, and general organic solvents (THF, DMSO, m- Due to poor solubility in cresol and chloroform, it was not suitable for tantalum electrolytic capacitors or aluminum electrolytic capacitors due to poor penetration and lack of affinity into oxidized tantalum or aluminum pores.

The electrolyte for an electrolytic capacitor according to the present invention has excellent solubility in alcohols and general organic solvents, which are environmentally friendly protic solvents, and thus tantalum oxide or aluminum pores oxidized by hydrogen bonding of an electrolyte solution with aluminum. Excellent permeability and affinity.

In addition, it has excellent electrical conductivity and thermal stability compared to conventional chemical methods, and forms a uniform coating inside oxidized tantalum or aluminum, showing stable capacitance characteristics regardless of frequency, and especially ideal for high impedance (100KHz to 10MHz) It is possible to realize large capacity.

The present invention as described above will be described with reference to Examples.

Example 1

The electrolyte synthesis method of the conductive polypyrrole soluble in an alcohol and an organic acid which is a proton solvent of the present invention is as follows.

(Ⅰ)

The compound of formula (I) is a pyrrole monomer which is four carbons and one 5-ring heterocyclic monomer.

(Ⅱ)

In the said general formula (II), R and R 'are isooctyl, X is sulfosuccinic acid, the isooctyl sulfosuccinic acid which is a sodium sulfosuccinic acid salt, and the isooctyl sulfosuccinic acid sodium salt.

As described above, pyrrole, a monomer of general formula (I), was purified after vacuum distillation, and ammonium persulfate, an oxidant, and diisooctylsulfosuccinate sodium salt, which is a dopant of general formula (II), were manufactured in Japan TCI S.0-139. Isooctylsulfosuccinic acid was used by chemical treatment of sodium diisooctylsulfosuccinate.

0.4 mol pyrrole and 0.2 mol diisooctylsulfosuccinic acid were added to 900 ml distilled water in a 1 L beaker at 0 ° C. and stirred with a magnetic stirrer. Separately, 0.1 mol ammonium persulfate is added to 100 ml distilled water in a 500 ml beaker and stirred with a magnetic stirrer. 0.1 mol ammonium persulfate solution is slowly added to the pyrrole and diisooctylsulfosuccinic acid mixture at 0 ° C. Stir the reaction slowly with a magnetic stir for 20 hours.

After the reaction was over, the reaction solution was Buchner (buchner) washed in the funnel with distilled water and filtered, put After filtering the resulting piece on a drying tube (drying tube) connected to the vacuum line for 24 hours dynamics (dynamic) vacuum ^{(10- 3} torr) to dry to prepare a polypyrrole as shown in the general formula III.

(Ⅲ)

In general formula (III), A <^-> is polypyrrole doped with anion which is isooctyl sulfosuccinate.

When isooctylsulfosuccinate sodium salt was used as the dopant, it was synthesized in the same manner.

The dried polypyrrole powder can be hydrogen bonded to environmentally friendly protic solvents such as methyl alcohol, ethyl alcohol, 1-butanol, isopropyl alcohol, isobutyl alcohol, t-butyl alcohol, benzyl alcohol, 2,2,2-tri Alcohols such as fluoroethanol, lauryl alcohol, oleyl alcohol, ethylene glycol and the like; And polarities such as formic acid, 1-methyl-2-pyrrolidone (NMP), acetic acid, dilute sulfuric acid, dilute nitric acid, dilute hydrochloric acid, dimethyl sulfoxide (DMSO), N, N'-dimethylformamide (DMF), and the like. Polypyrrole dissolved in various solvents such as o-chlorophenol, m-cresol, tetrahydrofuran (THF), acetic acid, trifluoroacetic acid and the like and non-polar solvents such as chloroform, dichloromethane, benzene, etc. An electrolyte solution was prepared.

After immersing the tantalum oxide pellets oxidized for 20 minutes in the polypyrrole 2wt% electrolyte solution, which is a conductive polymer, it was uniformly coated to the pore velocity inside the pellet and dried at 100 ° C. for 30 minutes. Repeated five times as described above was coated with polypyrrole inside and outside the oxidized tantalum pellet. FIG. 2 shows hydrogen bonding between tantalum oxide and polypyrrole solution when polypyrrole is dissolved in t-butylalcohol, a protic solvent, and then immersed in tantalum oxide.

Carbon paste and silver paste were coated on polypyrrole-coated oxidized tantalum pellet to prepare a tantalum electrolytic capacitor as shown in FIG. 1.

Example 2

The oxidized aluminum pellets were immersed in a polypyrrole 2wt% electrolyte solution prepared in the same manner as in Example 1 for 20 minutes, and then uniformly coated to the pores inside the pellets, and then dried at 100 ° C. for 30 days. In this manner, the polypyrrole was coated on the inside and the outside of the oxidized aluminum pellet in five repetitions. The polypyrrole-coated oxidized aluminum pellets were coated with carbon paste and silver paste to prepare an aluminum electrolytic capacitor as shown in FIG. 2.

Example 3

A coupling agent (3-Aminopropyltriethoxysilane, 3-Aminopropyldiethoxymethylsilane, 3-Aminopropyltrimethoxysilane, Vinyltris (2-methoxyethoxy) silane, N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane, etc.) was added to the polypyrrole solution prepared in the same manner as in Example 1. Environmentally friendly protic solvents capable of hydrogen bonding by addition of wt%, such as methyl alcohol, ethyl alcohol, 1-butanol, isopropyl alcohol, isobutyl alcohol, t-butyl alcohol, benzyl alcohol, 2,2,2-trifluoro Alcohols such as roethanol, lauryl alcohol, oleyl alcohol, ethylene glycol and the like; And polarities such as formic acid, 1-methyl-2-pyrrolidone (NMP), acetic acid, dilute sulfuric acid, dilute nitric acid, dilute hydrochloric acid, dimethyl sulfoxide (DMSO), N, N'-dimethylformamide (DMF), and the like. Polypyrrole dissolved in various solvents such as o-chlorophenol, m-cresol, tetrahydrofuran (THF), acetic acid, trifluoroacetic acid and the like and non-polar solvents such as chloroform, dichloromethane, benzene, etc. An electrolyte solution was prepared.

After immersing the tantalum oxide pellets oxidized for 20 minutes in the polypyrrole 2wt% electrolyte solution, which is a conductive polymer, it was uniformly coated to the pore velocity inside the pellet and dried at 100 ° C. for 30 minutes. Repeated five times as described above was coated with polypyrrole inside and outside the oxidized tantalum pellet. Figure 4 shows the chemical interaction of the oxidized tantalum and the coupling agent, polypyrrole when dipping in oxidized tantalum after addition of vinyltris (β-methoxysilane) as a coupling agent to the polypyrrole solution.

Carbon paste and silver paste were coated on polypyrrole-coated oxidized tantalum pellet to prepare a tantalum electrolytic capacitor as shown in FIG. 1.

Example 4

The polypyrrole solution prepared in the same manner as in Example 1 can be hydrogen-bonded among the surfactants, a zwitterionic surfactant having a ring or alkylchain (N-lauryl-β-acetic acid, N-lauryl-β-aminopropinonic acid, N-lauryl-β-aminobutyric acid, etc.), nonionic surfactants (Sorbitan monooleate, POE Sorbitan monooleate, N, N'-dimethyl formamide dicyclohexyl acetal) and anionic surfactants (di- 0.5 wt% of alkyl sulfosuccinate, alkyl-α-sulfocarbonate, alkyl phosphate, petroleum sulfonate, etc.), such as methyl alcohol, ethyl alcohol, 1-butanol, isopropyl alcohol, and isobutyl alcohol. alcohols such as t-butyl alcohol, benzyl alcohol, 2,2,2-trifluoroethanol, lauryl alcohol, oleyl alcohol, ethylene glycol and the like; And polarities such as formic acid, 1-methyl-2-pyrrolidone (NMP), acetic acid, dilute sulfuric acid, dilute nitric acid, dilute hydrochloric acid, dimethyl sulfoxide (DMSO), N, N'-dimethylformamide (DMF), and the like. Polypyrrole dissolved in various solvents such as o-chlorophenol, m-cresol, tetrahydrofuran (THF), acetic acid, trifluoroacetic acid and the like and non-polar solvents such as chloroform, dichloromethane, benzene, etc. An electrolyte solution was prepared.

After immersing the oxidized tantalum pellet for 20 minutes in the polypyrrole 2wt% electrolyte solution, which is a conductive polymer, it was uniformly coated to the pore velocity inside the pellet and dried at 100 ° C. for 30 minutes. Repeated five times as described above was coated with polypyrrole inside and outside the oxidized tantalum pellet.

Tantalum electrolytic capacitors were prepared by coating carbon paste and silver paste on oxidized tantalum pellets coated with polypyrrole.

Example 4

Soluble polypyrrole was prepared in the same manner as in Example 1, but using benzensulfonic acid di (2-ethylhexyl) ester of formula IV.

(IV)

The dried polypyrrole powder can be hydrogen bonded to environmentally friendly protic solvents such as methyl alcohol, ethyl alcohol, 1-butanol, isopropyl alcohol, isobutyl alcohol, t-butyl alcohol, benzyl alcohol, 2,2,2-tri Alcohols such as fluoroethanol, lauryl alcohol, oleyl alcohol, ethylene glycol and the like; And polar solvents such as formic acid, 1-methyl-2-pyrrolidone (NMP), acetic acid, dilute sulfuric acid, dilute nitric acid, dilute hydrochloric acid, dimethyl sulfoxide (DMSO), N, N'-dimethylformamide (DMF), and the like. And polypyrrole electrolytes dissolved in various organic solvents such as o-chlorophenol, m-cresol, tetrahydrofuran (THF), acetic acid, trifluoroacetic acid, and the like, and non-polar solvents such as chloroform, dichloromethane, benzene, and the like. The solution was prepared.

After immersing the tantalum oxide pellets oxidized for 20 minutes in the polypyrrole 2wt% electrolyte solution, which is a conductive polymer, it was uniformly coated to the pore velocity inside the pellet and dried at 100 ° C for 30 minutes. Repeated five times as described above was coated with polypyrrole inside and outside the oxidized tantalum pellet. Figure 5 shows the chemical bonding state of the oxidized tantalum and the surfactant, polypyrrole when immersed in oxidized tantalum after the addition of an amphoteric surfactant (N-lauryl-β-aminopropinonicacid) to the polypyrrole solution It was. Carbon paste and silver paste were coated on polypyrrole-coated oxidized tantalum pellet to prepare a tantalum electrolytic capacitor of the type as shown in FIG. 1.

In addition, as described above, the pyrrole monomer of formula I is reacted with dodecylbenzensulfonic acid and naphthalensulfonic acid, or anthraquinone sulfonic acid in the presence of an oxidizing agent. fonic acid) is polymerized with a mixed dopant to prepare a conductive polymer polypyrrole, which can be dissolved in an organic solvent and used as an electrolyte of an electrolytic capacitor. , Vinyltris (2-methoxyethoxy) silane, 3-Ureidopropyltriethoxysilane, N- [2- (N-Vinyl-benzylamino) ethyl] -3-aminopropyltrimethoxysilane Hydrochloride, N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane alkoxysilanes In order to prepare an soluble polypyrrole electrolyte for an electrolytic capacitor, arylsilanes are added in an amount of 0.01 wt% (wt.%) To 10 wt% (wt.%).

As described above, the polypyrrole according to the present invention has excellent thermal atmospheric stability in air and is economical because it is immersed in an electrolyte solution and coated and dried, and thus, uniform coating into tantalum is possible and stable regardless of frequency. In addition to the capacitance characteristics, it is possible to develop a tantalum electrolytic capacitor capable of realizing low impedance and high capacity, which is ideal in the high frequency band (100KHz to 10MHz).

Claims (15)

A pyrrole monomer of general formula (I) is polymerized with a dopant of general formula (II) in the presence of an oxidizing agent to prepare a conductive polymer polypyrrole of general formula (III), which is dissolved in an alcohol and an organic solvent as a protic solvent and used as an electrolyte of an electrolytic capacitor. A method for producing a soluble polypyrrole electrolyte for an electrolytic capacitor. The method of claim 1, The dopant is represented by the formula II in which R is C2-C20 alkyl, isoalkyl, alkoxy, alkoxyalkyl, alkoxyalkyl, alkylsulfonyl, alkoxycarbo Alkoxycarbonyl, alkylsilane, arylsulfonyl, alkenyl, R 'is hydrogen, alkyl of 2 to 20 carbons, isoalkyl, al Electrolytic capacitor characterized in that the alkoxy (alkoxyl), alkoxyalkyl (alkoxyalkyl), alkylsulfonyl (alkylsulfonyl), alkoxycarbonyl (alkoxycarbonyl), alkylsilane (arylsilane), arylsulfonyl, alkenyl (alkenyl) Process for preparing soluble polypyrrole electrolyte. The method of claim 1, The dopant is represented by the general formula IV in which R is 2 to 20 carbon alkyl, isoalkyl, alkoxyl, alkoxyalkyl, alkoxyalkyl, alkylsulfonyl, alkoxycarbo Alkoxycarbonyl, alkylsilane, arylsulfonyl, alkenyl, R 'is hydrogen, alkyl of 2 to 20 carbons, isoalkyl, al Alkoxyl, alkoxyalkyl, alkylsulfonyl, alkoxycarbonyl, alkylsilane, arylsulfonyl, alkenyl, Y-benzenesulfonic acid, naphthalene A method for producing a soluble polypyrrole electrolyte for an electrolytic capacitor, characterized in that it is sulfonic acid, sodium naphthalene sulfonate, anthraquinone sulfonic acid and sodium anthraquinone sulfonate. The method according to any one of claims 1 to 3, Dopants with hydrogen bonds (Naphtol-3,6-disulfonic acid, 5-Salicylicsulfonic acid, Toluenesulfonic acid, Naphthalenesulfonic acid, Anthraquion-2-sulfonic acid, Naphthalene-1.5-disulfonic acid, Anthraquion-2,7-disulfonic acid, A method for producing a soluble polypyrrole electrolyte for an electrolytic capacitor, characterized in that it is synthesized using a mixture dopant to which Dodecylbenzensulfonic acid, Salicylic acid) is added. The method according to any one of claims 1 to 3, Ferrous ammonium sulfate, Iron sulfate, Iron perchlorate, Potassium permanganate, Potassium dichromate, Potassium persulfate as oxidizing agents or A method for producing a soluble polypyrrole electrolyte for an electrolytic capacitor, characterized in that polypyrrole mixed with ammonium persulfate is dissolved in an alcohol and an organic solvent, which is a proton solvent capable of hydrogen bonding, and used as an electrolyte of an electrolytic capacitor. The method according to any one of claims 1 to 3 Hydrogen-bonded proton solvent prepared above (hydrogen-bonded tantalum oxide and hydrogen bond -OH, -SO ₃ H, -COOH, -NH functional group solvent) alcohol (methyl alcohol, ethyl alcohol, 1-butyl Alcohol, isopropyl alcohol, isobutyl alcohol, t-butyl alcohol, 1-pentyl alcohol, 1-hexyl alcohol, benzyl alcohol, 2,2,2-trifluoroethanol, lauryl alcohol, oleyl alcohol, ethylene glycol) Soluble polypyrrole electrolyte for an electrolytic capacitor, characterized in that it is dissolved in an organic acid solvent (formic acid, acetic acid, capric acid, dilute sulfuric acid, dilute hydrochloric acid, dilute nitric acid, trichloroacetic acid) and prepared by dipping. Manufacturing method. The method according to any one of claims 1 to 3, Coupling agents 3-Aminopropyltriethoxysilane, 3-Aminopropyldiethoxymethylsilane, 3-Aminopropyltrimethoxysilane, Vinyltris (2-methoxyethoxy) silane, 3-Ureidopropyltriethoxysilane, N- [2- (N-Vinylbenzylamino) ethyl] -3-aminopropyltrimethoxysilane Hydrochloride, Electrolytic capacitor characterized by adding 0.01 weight percent (wt.%) To 10 weight percent (wt.%) Of alkoxysilanes and arylsilanes of N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane Process for preparing soluble polypyrrole electrolyte. The method of claim 4, wherein A method for producing a soluble polypyrrole electrolyte for an electrolytic capacitor by dissolving polypyrrole synthesized at a synthesis reaction temperature of -20 ° C. to 70 ° C. in an alcohol and an organic solvent, which is a proton solvent capable of hydrogen bonding, by dipping. The method of claim 4, wherein Coupling agents 3-Aminopropyltriethoxysilane, 3-Aminopropyldiethoxymethylsilane, 3-Aminopropyltrimethoxysilane, Vinyltris (2-methoxyethoxy) silane, 3-Ureidopropyltriethoxysilane, N- [2- (N-Vinylbenzylamino) ethyl] -3-aminopropyltrimethoxysilane Hydrochloride, Electrolytic capacitor characterized by adding 0.01 weight percent (wt.%) To 10 weight percent (wt.%) Of alkoxysilanes and arylsilanes of N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane Process for preparing soluble polypyrrole electrolyte. The method of claim 4, wherein The polypyrrole solution can be hydrogen-bonded among the surfactants, and has a ring or an alkylchain (cationic chain) anionic surfactants (N-lauryl-β-aminopropinonic acid, N-lauryl-β-aminobutyric acid , N-lauryl-β-acetic acid, etc.), nonionic surfactants (Sorbitan monooleate, POE Sorbitan monooleate, N, N'-dimethyl formamide dicyclohexyl acetal) and anionic surfactants (di-alkyl sulfosuccinate, alkyl-α-sulfocarbonate, Alkyl phosphate, petroleum sulfonate) is prepared by adding 0.01 wt% to 10 wt% of a soluble polypyrrole electrolyte for an electrolytic capacitor. The method of claim 5, A method for producing a soluble polypyrrole electrolyte for an electrolytic capacitor by dissolving polypyrrole synthesized at a synthesis reaction temperature of -20 ° C. to 70 ° C. in an alcohol and an organic solvent, which is a proton solvent capable of hydrogen bonding, by dipping. The method of claim 5, Coupling agents 3-Aminopropyltriethoxysilane, 3-Aminopropyldiethoxymethylsilane, 3-Aminopropyltrimethoxysilane, Vinyltris (2-methoxyethoxy) silane, 3-Ureidopropyltriethoxysilane, N- [2- (N-Vinylbenzylamino) ethyl] -3-aminopropyltrimethoxysilane Hydrochloride, Electrolytic capacitor characterized by adding 0.01 weight percent (wt.%) To 10 weight percent (wt.%) Of alkoxysilanes and arylsilanes of N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane Process for preparing soluble polypyrrole electrolyte. The method of claim 5, The polypyrrole solution can be hydrogen-bonded among the surfactants, and has a ring or an alkylchain (cationic chain) anionic surfactants (N-lauryl-β-aminopropinonic acid, N-lauryl-β-aminobutyric acid , N-lauryl-β-acetic acid, etc.), nonionic surfactants (Sorbitan monooleate, POE Sorbitan monooleate, N, N'-dimethyl formamide dicyclohexyl acetal) and anionic surfactants (di-alkyl sulfosuccinate, alkyl-α-sulfocarbonate, Alkyl phosphate, petroleum sulfonate) is prepared by adding 0.01 wt% to 10 wt% of a soluble polypyrrole electrolyte for an electrolytic capacitor. The method of claim 1, The pyrrole monomers of formula I are polymerized with mixed dopants of dodecylbenzensulfonic acid and naphthalensulfonic acid or anthraquion-2-sulfonic acid in the presence of an oxidizing agent. To prepare a conductive polymer polypyrrole and to dissolve it in an organic solvent to use as an electrolyte of an electrolytic capacitor. The method of claim 14, Coupling agents 3-Aminopropyltriethoxysilane, 3-Aminopropyldiethoxymethylsilane, 3-Aminopropyltrimethoxysilane, Vinyltris (2-methoxyethoxy) silane, 3-Ureidopropyltriethoxysilane, N- [2- (N-Vinylbenzylamino) ethyl] -3-aminopropyltrimethoxysilane Hydrochloride, Electrolytic capacitor characterized by adding 0.01 weight percent (wt.%) To 10 weight percent (wt.%) Of alkoxysilanes and arylsilanes of N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane Process for preparing soluble polypyrrole electrolyte.