JPH10242008A - Electric double layer capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the usage of a noble metal and increase the capacitance density, by constituting at least one polarizable electrode of a laminate of a high conductive thin film and a conductive polymer film formed by electrolytic polymerization. SOLUTION: A substrate 7 is composed of a polymer film for general use such as polyethylene, polyethylene terephthalate, and polystyrene or paper. A high conductive thin film 1 like gold is formed on the substrate by using sputtering or CVD or an ion-plating method. After a conductive polymer film 2 like polypyrrole is formed by using a potentiostatic electrolytic polymerization, the substrate 7 is peeled from the high conductive thin film 1, and eliminated by dissolving. Thereby the thickness of lamination structure is made 1/2 or less, the same capacitance as the conventional one can be obtained in this structure, the capacitance density is increased, and the usage of a noble metal like gold as the collector can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for increasing capacity density,
The present invention relates to an electric double layer capacitor with reduced cost.

[0002]

2. Description of the Related Art As is well known, an electric double layer capacitor is:
It is mainly composed of a pair of polarizable electrodes, current collecting electrodes of each polarizable electrode, and a porous separator interposed between the polarizable electrodes. Each polarizable electrode and separator is impregnated with an electrolytic solution.

As a method of forming such a polarizable electrode, a method of using a conductive polymer formed on a current collector by an electrolytic polymerization method is known. FIG. 8 is a conceptual configuration diagram of a conventional electric double layer capacitor in which a separator is sandwiched between polarizable electrodes. In the figure, a current collector 9 such as gold or platinum
A conductive polymer film 2 such as polypyrrole is formed by an electrolytic polymerization method to form a polarizable electrode. The polarizable electrodes are arranged on both sides of the separator 3 to form an electrode portion of the electric double layer capacitor.

Next, an experimental example for forming a conventional polarizable electrode will be described. Height 100mm, width 50mm,
A gold foil having a thickness of about 50 microns is impregnated to a depth of 50 mm in length with an aqueous solution containing 0.1 (mol / l) sodium benzenesulfonate and 0.1 (mol / l) pyrrole, and is subjected to potentiostatic electrolytic weighting. Legal (800mV vs.
SSCE) to conduct a potentiostatic electrolytic polymerization with a polymerization charge of 5 (C /
cm ² ). At this time, the polypyrrole film thickness is 1
It became 5 microns.

[0005] Another polarizable electrode is prepared, and a nylon-based nonwoven fabric having a thickness of 0.05 mm is interposed therebetween and fixed.
It was immersed in a 0.1 (mol / liter) aqueous solution of sodium benzenesulfonate, and the capacitance was measured.
It was Farad. The withstand voltage characteristic was 1.2V.

The separator used for the electric double layer capacitor is an insulating porous material which prevents electrical short circuit between the bipolar electrodes, is electrochemically stable, has a high ion permeability, and has a certain mechanical strength. I just need. Specifically, a nonwoven fabric, a porous polypropylene film, a polyethylene film, or the like can be used.

FIG. 9 is a sectional view showing an example of an electric double layer capacitor using such a polarizable electrode. In the figure, 9 is a current collector, 2 is a conductive polymer film such as polypyrrole formed on the current collector by an electrolytic polymerization method, 3 is a separator formed of nonwoven fabric or the like, 4 is a can, and 5 is a cap. , 6
Is a packing. The current collector 9, the conductive polymer film 2, and the separator 3 are impregnated with an electrolyte. As the electrolyte,
Single or plural cations such as proton, alkali metal ion, quaternary ammonium ion, quaternary sulfonium ion and the like, sulfonate ion, perchlorate ion, arsenic hexafluoride ion, halogen ion, phosphate ion, sulfate ion, nitric acid A single ion or a combination of a plurality of anions is used.

In order to improve the withstand voltage characteristics of the electric double layer capacitor, as shown in FIG. 10, an electric double layer capacitor having units A and B stacked and connected in series is used. I have. Each of the units A and B has the configuration shown in FIG.

Next, an example of a manufacturing process in a case where two electric double layer capacitors as shown in FIG. 10 are stacked and connected in series will be described. Diameter 15E, thickness about 1m
An electrode was fabricated by forming 0.5 micron gold on a m stainless steel by sputtering. The wiring for polymerization was formed by bonding a copper lead wire to the back surface of the electrode with a silver paste. The back surface of the electrode was insulated with silicone resin so that unnecessary reactions did not occur on the back surface of the electrode. This is 0.1
(Mol / l) of sodium benzenesulfonate and 0.1 (mol / l) of an aqueous solution containing pyrrole, and then subjected to a potentiostatic electrolytic polymerization method (800 mV vs. SS).
The constant potential electrolytic polymerization by CE) is carried out with a polymerization charge amount of 5 (C / cm).
² ). At this time, the polypyrrole film thickness was 15 microns. The lead wire on the back surface of the electrode and the silicone resin were subsequently peeled off.

[0010] Another electrode prepared in this manner is manufactured, and a 0.05 mm-thick nylon-based nonwoven fabric immersed in a 0.1 (mol / liter) aqueous solution of sodium benzenesulfonate is sealed between cans. did. Another such sealed structure was made and connected in series. The capacitance of this electric double layer capacitor was 0.1 farad, and the withstand voltage characteristic was 2.4 V. The shape of the finished product was 15 mm in diameter and 6 mm in thickness, and the total number of steps was 23.

[0011]

The polarizable electrode formed as described above has a problem that the volume of the current collector occupies a large proportion in the constituent parts and it is difficult to increase the capacity density. there were. Further, since noble metals such as gold and platinum are used as the current collector, there is a problem that the amount of these noble metals increases and the electric double layer capacitor becomes expensive.

In order to improve the withstand voltage, a plurality of unit electric double layer capacitors are stacked and connected in series as shown in FIG.
There is a problem that a sufficient capacity density cannot be obtained.

The present invention has been made in view of the above problems, and has as its object to provide an electric double layer capacitor in which the cost is reduced by reducing the amount of noble metal used and the capacitance density is increased.

It is another object of the present invention to provide an electric double layer capacitor having improved withstand voltage characteristics and an improved capacitance density without increasing the number of manufacturing steps.

[0015]

Means for Solving the Problems The above-mentioned problem is caused by impregnating a pair of polarizable electrodes with an electrolytic solution and interposing a separator in an electric double layer capacitor, wherein at least one of the polarizable electrodes is This is achieved by forming a laminate of a highly conductive thin film and a conductive polymer film formed by electrolytic polymerization.

Further, in an electric double layer capacitor comprising a pair of polarizable electrodes impregnated with an electrolytic solution and having a separator interposed therebetween, a substrate having a conductive polymer film formed on both surfaces by electrolytic polymerization, Two electrodes on which a conductive polymer film is formed by electrolytic polymerization are provided on one surface of the electric body, and the substrate and the surface on which the conductive polymer film of the two electrodes is formed are arranged to face each other, This is achieved by forming a laminated structure by interposing a separator between the conductive polymer film formed on the substrate and the conductive polymer of each electrode.

According to the above feature of the present invention, a small amount of noble metal such as gold used for forming a highly conductive thin film can be used, and the manufacturing cost can be reduced. In addition, the same electrical characteristics can be obtained with a smaller electric double layer capacitor than before, so that the capacitance density can be increased.

Further, the number of manufacturing steps for manufacturing an electric double layer capacitor having a large withstand voltage characteristic can be reduced, and the capacitance density can be increased.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric double layer capacitor according to the present invention will be described below with reference to the drawings.
FIGS. 3A and 3B are explanatory views showing a method for generating a polarizable electrode used in the electric double layer capacitor according to the present invention. In FIG. 1A, reference numeral 7 denotes a substrate using a general-purpose polymer film such as polyethylene, polyethylene terephthalate, or polystyrene or paper; and 1 denotes a substrate formed on the substrate 7 by vapor deposition, sputtering, CVD, ion plating, or the like. A highly conductive thin film such as a gold film as a current collector, and 2 is a conductive polymer film such as a polypyrrole film formed by constant potential electrolytic polymerization.

As shown in FIG. 3 (a), a highly conductive thin film 1 such as gold is formed on a substrate 7, and a conductive polymer film 2 such as polypyrrole is formed by a potentiostatic electrolytic polymerization method. Then, as shown in FIG. 2B, the substrate 7 is removed from the highly conductive thin film 1 by peeling, dissolving or the like to form a polarizable electrode for an electric double layer capacitor.

Next, an experimental example of the present invention and an experimental example for comparing characteristics with the present invention will be described.

(Experimental Example 1) 100 mm long, 50 mm wide,
0.05 micron of gold was deposited on a polyethylene film having a thickness of about 10 microns. This is impregnated to a depth of 50 mm with an aqueous solution containing 0.1 (mol / l) sodium benzenesulfonate and 0.1 (mol / l) pyrrole, and is subjected to a potentiostatic electrolytic polymerization method (800 mV v
s SSCE) to conduct polymerization at a potential
(C / cm ² ). At this time, the polypyrrole film thickness was 15 microns. Thereafter, the polypyrrole film was peeled off from the polyethylene film. Gold is 0.05
It remained on the polypyrrole with a thickness of microns. Another laminate having such a structure is manufactured and has a thickness of 0.05 m.
m nylon-based non-woven fabric was sandwiched and fixed, and immersed in an aqueous solution of 0.1 (mol / liter) sodium benzenesulfonate. The capacitance was measured to be 3.0 farads. The withstand voltage characteristic was 1.2V.

(Experimental Example 2) 100 mm long, 50 mm wide,
0.05 micron of gold was deposited on a polyethylene film having a thickness of about 10 microns. This is impregnated to a depth of 50 mm with an aqueous solution containing 0.1 (mol / l) sodium benzenesulfonate and 0.1 (mol / l) pyrrole, and is subjected to a potentiostatic electrolytic polymerization method (800 mV v
s SSCE) to conduct polymerization at a potential
(C / cm ² ). At this time, the polypyrrole film thickness was 15 microns. Unlike (Experimental Example 1),
The polypyrrole film was left on the polyethylene film. Another laminate having such a configuration is prepared, and a nylon-based nonwoven fabric having a thickness of 0.05 mm is interposed therebetween and fixed.
It was immersed in a 0.1 (mol / liter) aqueous solution of sodium benzenesulfonate, and the capacitance was measured.
It was 0 farads. The withstand voltage characteristic was 1.2V.

(Experimental Example 3) 100 mm long, 50 mm wide,
0.05 micron of gold was deposited on a polyethylene terephthalate film having a thickness of about 10 microns. This is vertical 50
to a depth of 0.1 mm with an aqueous solution containing 0.1 (mol / l) sodium benzenesulfonate and 0.1 (mol / l) pyrrole, and then electro-potential electropolymerization (8
(MVvs SSCE) was performed until the polymerization charge amount reached 5 (C / cm ² ). At this time, the polypyrrole film thickness was 15 microns. Thereafter, the polypyrrole film was peeled from the polyethylene terephthalate film. Gold remained on the polypyrrole. Another such polarizable electrode was prepared, and a nylon-based nonwoven fabric having a thickness of 0.05 mm was interposed between the electrodes and fixed.
(Liter) of an aqueous solution of sodium benzenesulfonate, and the capacitance was measured to be 3.0 farads. The withstand voltage characteristic was 1.2V.

(Experimental Example 4) 100 mm long, 50 mm wide,
0.05 gold on a polystyrene plate about 10 microns thick
Micron deposited. This is 0.1 mm to a depth of 50 mm.
(Mol / l) of sodium benzenesulfonate and 0.1 (mol / l) of an aqueous solution containing pyrrole, and then subjected to a potentiostatic electrolytic polymerization method (800 mV vs. SS).
The constant potential electrolytic polymerization by CE) is carried out with a polymerization charge amount of 5 (C / cm).
² ). At this time, the polypyrrole film thickness was 15 microns. Thereafter, the polystyrene plate was removed by dissolving with acetone. Another such polarizable electrode is prepared, a nylon-based nonwoven fabric having a thickness of 0.05 mm is interposed therebetween, fixed, and immersed in an aqueous solution of sodium benzenesulfonate of 0.1 (mol / L), and The capacity was measured to be 3.0 farads. The withstand voltage characteristic was 1.2V.

(Experimental Example 5) 100 mm long, 50 mm wide,
A gold electrode with a thickness of about 2 mm is 0.1 mm to a depth of 50 mm.
(Mol / liter) of sodium benzenesulfonate and 0.1 (mol / liter) of an aqueous solution containing pyrrole, followed by potentiostatic electrolytic polymerization (800 mV vs. SSC).
E) is carried out by a constant potential electrolytic polymerization with a polymerization charge amount of 5 (C / c).
m ² ). At this time, the polypyrrole film thickness is 15
Micron. Thereafter, the polypyrrole film was peeled off from the gold electrode. 0.05 mm of gold was deposited on only one surface of the polypyrrole film to form a polarizable electrode. Another such polarizable electrode is prepared, a nylon-based nonwoven fabric having a thickness of 0.05 mm is interposed therebetween, fixed, and immersed in an aqueous solution of sodium benzenesulfonate of 0.1 (mol / L), and The capacity was measured to be 2.8 farads. The withstand voltage characteristic was 1.2V.

Table 1 summarizes the results of (Experimental Example 1) to (Experimental Example 5).

[0028]

[Table 1]

FIG. 2 is a partial explanatory view of an electric double layer capacitor having a polarizable electrode according to the present invention. In the figure, 1 is a highly conductive thin film of gold or the like, 2 is a conductive polymer film, 3
Is a separator. The thickness of the laminated structure shown in FIG. 2 is about 80 microns. Comparing this with the thickness of the laminated structure of the conventional electric double layer capacitor shown in FIG.
In the configuration of FIG. 8, since the thickness is about 180 microns, the thickness of the laminated structure is less than half. With such a structure, the value of the capacitance is the same as that of the conventional example, so that the capacitance density of the electric double layer capacitor can be increased. In addition, since a highly conductive thin film such as gold is used as a current collector, the amount of precious metal used such as gold is reduced, and as shown in FIG.
About 0.1% of gold is used per layer of the laminate
Could be reduced to

FIG. 1 is a cross-sectional view showing an example of a case where an electric double layer capacitor is formed using the laminated structure shown in FIG. In this example, the conductive polymer film 2 and the highly conductive thin film 1 are formed on both sides of the separator 3 to form a polarizable electrode. However, such a polarizable electrode is used only on one side, and the polarizable electrode on the opposite side is used. Even if the electrode has a conventional configuration, it is possible to increase the capacity density and reduce the amount of noble metal such as gold used.

FIG. 6 is an explanatory view of a case where a plurality of electric double layer capacitors of the present invention are stacked in order to improve the withstand voltage characteristics. In this example, a base 10 having a conductive polymer film 2 formed on both surfaces thereof, and a conductive polymer film 2
The substrate 10 and the surface on which the conductive polymer film 2 of the two electrodes is formed are arranged to face each other, and the conductive polymer film 2 formed on the base 10 The separator 3 is interposed between the conductive polymers 2 of each electrode to form a laminated structure.

Next, a process of manufacturing the electric double layer capacitor as shown in FIG. 6 will be described. An electrode was prepared by forming 0.5 micron gold on a stainless steel having a diameter of 15 mm and a thickness of about 1 mm by sputtering. A wiring for polymerization was produced by bonding a copper lead wire to the back surface of the electrode with a silver paste. The back surface of the electrode was insulated with silicone resin so that unnecessary reactions did not occur on the back surface of the electrode. This was impregnated with an aqueous solution containing 0.1 (mol / liter) sodium benzenesulfonate and 0.1 (mol / liter) pyrrole, and was subjected to a constant potential electrolytic polymerization method (800 mV vs. 800 mV).
SSCE) was carried out with a constant potential electropolymerization of 5 (C
/ Cm ² ). At this time, the polypyrrole film thickness is 1
It became 5 microns. The lead wire on the back surface of the electrode and the silicone resin were subsequently peeled off. Another electrode thus prepared is manufactured, and a pair of electrodes is prepared.

Next, length 40E, width 20mm, thickness about 50
Micron gold foil to a depth of 20 mm vertically to 0.1 (mol /
Liters) of sodium benzenesulfonate and 0.1
(Mole / liter) of an aqueous solution containing pyrrole, and a potentiostatic electrolytic polymerization method (800 mV vs. SSCE).
Was carried out on both surfaces of the gold foil until the polymerization charge amount reached 5 (C / cm ² ) to produce a substrate. At this time, the polypyrrole film thickness was 15 microns. Cut this board,
It was formed into a disk having a diameter of 15 mm.

The above substrate is sandwiched between the pair of electrodes, and a 0.05 mm thick nylon immersed in a 0.1 (mol / liter) aqueous solution of sodium benzenesulfonate is provided between each electrode and the substrate. The nonwoven fabric was sealed with a nonwoven fabric sandwiched therebetween and sealed. The electric double layer capacitor has a capacitance of 0.1 farad and a withstand voltage characteristic of 2.
It was 4V. The shape of the finished product was 15 mm in diameter and 3 mm in thickness, and the total number of processes was 13. In this manner, even if the thickness is reduced by half compared to the conventional example and the size is reduced, the same electrical characteristics can be obtained, so that the capacity density is improved. Further, an electric double layer capacitor having a high withstand voltage characteristic can be manufactured with a significantly reduced number of manufacturing steps as compared with the related art.

In the above example, only polypyrrole was used as the material of the conductive polymer film, but polypyrrole and a different kind of conductive polymer material can be used in combination. next,
An example in which such a polypyrrole and a different kind of conductive polymer material are used in combination will be described.

Two electrodes were produced by sputtering 0.5 micron gold on stainless steel having a diameter of 15 mm and a thickness of about 1 mm. A wiring for polymerization was produced by bonding a copper lead wire to the back surface of the electrode with a silver paste.
The back surface of the electrode was insulated with silicone resin so that unnecessary reactions did not occur on the back surface of the electrode. This one electrode is 0.1
(Mol / liter) of tetraethylammonium benzenesulfonate and 0.1 (mol / liter) of a pyrrole in an acetonitrile solution, and the potential of the polymer was determined by the potentiostatic electrolytic polymerization (800 mV vs. SSCE). 5 (C / cm ² ). At this time, the polypyrrole film thickness was 15 microns.

The other electrode was treated with 0.1 (mol / liter) of tetraethylammonium benzenesulfonate
(Mol / liter) of thiophene-containing acetonitrile solution, and the solution was impregnated with a potentiostatic electrolytic polymerization method (800 mV v
s SSCE) to conduct polymerization at a potential
(C / cm ² ). At this time, the film thickness of thiophene was 15 microns. The lead wires on the back surfaces of the two electrodes and the silicone resin were subsequently peeled off.

Next, as shown in FIG. 7A, after one side of the electrode is masked with a resist 8, it is 40 mm long and 2 mm wide.
A gold foil having a thickness of 0 mm and a thickness of about 50 microns is impregnated to a depth of 20 mm in an acetonitrile solution containing 0.1 (mol / liter) of tetraethylammonium benzenesulfonate and 0.1 (mol / liter) of pyrrole. The constant potential electrolytic polymerization by the potential electrolytic polymerization method (800 mV vs. SSCE) was performed up to a polymerization charge amount of 5 (C / cm ² ).

Next, the resist 8 is peeled off, and FIG.
As shown in the figure, the surface of the polypyrrole 2 was masked with polyethylene and a sealing material 8 '. Thereafter, the resultant was impregnated with an aqueous solution containing 0.1 (mol / liter) tetraethylammonium benzenesulfonate and 0.1 (mol / liter) thiophene to a depth of 20 mm, and then the mask was peeled off. At this time, the film thickness of both polypyrrole and thiophene was 15 microns. This substrate was formed into a diameter of 15 mm.

The substrate and each electrode were arranged so that the polypyrrole film and the thiophene film faced each other, and the electrode and the substrate were immersed in a 0.1 (mol / liter) solution of tetraethylammonium benzenesulfonate in acetonitrile. Seal with a nylon-based nonwoven fabric of about 0.05 mm in thickness. This configuration is a configuration in which thiophene is shown as an illustration number (2 ′) instead of polypyrrole as an illustration number 2 as the conductive polymer film in FIG. The entire laminate thus formed was sealed and the capacitance was measured to be 0.12 farads. The withstand voltage characteristic was 2.4 V. The shape of the finished product is 15mm in diameter,
The thickness was 3 mm and the total number of steps was 18.

In this way, the one in which the different kinds of conductive polymer films are arranged to face each other has a thickness reduced by half and its size is reduced as compared with the conventional example, but the electrical characteristics are almost the same. Is obtained, so that the capacity density is improved. Further, an electric double layer capacitor having high withstand voltage characteristics can be manufactured with a smaller number of manufacturing steps than before.

FIG. 4 is a sectional view showing an example in which the laminate having the structure shown in FIG. 6 is integrated into an electric double layer capacitor. In the figure, 2 is a conductive polymer film, 3 is a separator,
4 is a can, 5 is a cap, 6 is a packing, 9 is a current collector, 1
0 is a substrate. In this example, the conductive polymer films 2 are all formed of the same material, for example, polypyrrole.

FIG. 5 shows another example in which an electric double layer capacitor is constituted by the laminate of FIG. The description of the same reference numerals as those in FIG. 4 will be omitted, and only the portions having different configurations will be described. In this example, materials of different materials are used as the conductive polymer films.
Is polypyrrole and 2 'is thiophene.

[0044]

As described above, the electric double layer capacitor according to the present invention is the electric double layer capacitor in which the paired polarizable electrodes are impregnated with an electrolytic solution and interposed through a separator. Is formed of a laminate of a highly conductive thin film and a conductive polymer film formed by electrolytic polymerization, the capacity density of the electric double layer capacitor can be increased. In addition, since a highly conductive thin film is used as a current collector, the amount of use of a noble metal such as gold can be reduced as compared with a conventional one, so that an electric double layer capacitor with a low manufacturing cost can be obtained.

Further, the electric double layer capacitor of the present invention
In an electric double-layer capacitor formed by impregnating a pair of polarizable electrodes with an electrolytic solution and interposing a separator, a substrate having a conductive polymer film formed on both surfaces by electrolytic polymerization, and one of the current collectors Two electrodes on which a conductive polymer film is formed by electrolytic polymerization are provided on the surface, and the substrate and the surface on which the conductive polymer film of the two electrodes is formed are arranged to face each other, and the surface is formed on the substrate. Since a separator is interposed between the conductive polymer film and the conductive polymer of each electrode to form a laminated structure, an electric double layer capacitor with large withstand voltage characteristics and an increased capacitance density with a small number of man-hours can be manufactured. can get.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a first example of an electric double layer capacitor according to the present invention.

FIG. 2 is a partial explanatory view of the electric double layer capacitor of the present invention.

FIG. 3 is an explanatory diagram of an example of a method for producing a polarizable electrode according to the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a second example of the electric double layer capacitor according to the present invention.

FIG. 5 is a sectional view showing a configuration of a third example of the electric double layer capacitor according to the present invention.

FIG. 6 is an explanatory diagram of an example in which the electric double layer capacitor according to the present invention has a laminated structure.

FIG. 7 is an explanatory view of another example of the method for producing the polarizable electrode of the present invention.

FIG. 8 is a conceptual configuration diagram of a conventional electric double layer capacitor.

FIG. 9 is a cross-sectional view of a conventional electric double layer capacitor.

FIG. 10 is a cross-sectional view of an example in which two conventional electric double layer capacitors are connected in series.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Highly conductive thin film 2 Conductive polymer film 3 Separator 4 Can 5 Cap 6 Packing 7 Base 8 Resist 9 Current collector 10 Substrate

Claims (5)

[Claims] 1. An electric double layer capacitor comprising a pair of polarizable electrodes impregnated with an electrolytic solution and having a separator interposed therebetween, wherein at least one of the polarizable electrodes is formed by electrolytic polymerization with a highly conductive thin film. An electric double-layer capacitor comprising a laminate with a conductive polymer film. 2. After depositing a highly conductive thin film on a substrate,
2. The electric double layer capacitor according to claim 1, wherein a conductive polymer film is formed by electrolytic polymerization, and the substrate is removed to form the laminate. 3. A conductive polymer film is formed on a metal plate by electrolytic polymerization, and after the metal plate is peeled off, a highly conductive thin film is formed on the conductive polymer film. The electric double layer capacitor according to claim 1, wherein: 4. An electric double layer capacitor comprising a pair of polarizable electrodes impregnated with an electrolytic solution and having a separator interposed therebetween, comprising: a substrate having a conductive polymer film formed on both surfaces by electrolytic polymerization; Two electrodes on which a conductive polymer film is formed by electrolytic polymerization are provided on one surface of the electric body, and the substrate and the surface on which the conductive polymer film of the two electrodes is formed are arranged to face each other, An electric double layer capacitor having a laminated structure in which a separator is interposed between a conductive polymer film formed on a substrate and a conductive polymer of each electrode. 5. The electric double layer capacitor according to claim 4, wherein the conductive polymer films formed on both surfaces of the substrate are made of different materials.