TWI501271B - A method for producing a conductive composition, a conductive composition, and a conductive composition Extreme method and electrode - Google Patents

Description

Method for preparing conductive composition, conductive composition, electricity Polar method and electrode

The present invention relates to a method for preparing a conductive composition, and more particularly to a method for preparing a conductive composition by converting polytetrafluoroethylene particles into a fibrous form in water, and a method for preparing the conductive composition. The conductive composition, the method of making the electrode from the conductive composition, and the electrode produced.

An electrode for an electric double-layer capacitor (EDLC) includes: a conductive substrate and a conductive layer disposed on the conductive substrate, wherein the conductive layer is formed of a conductive composition . It is possible to determine the processing method of the electrode depending on the needs of the subsequent product. For example, to make a winding type electric double layer capacitor, it is necessary to wind the electrode. However, the composition and properties of the conductive composition affect the quality of the electrode after winding, such as whether the conductive layer is cracked after the electrode is wound, or even the conductive layer and the conductive substrate are peeled off. Therefore, the industry is committed to developing new ones. The conductive composition and the method for producing the same improve the composition and properties of the conductive composition, thereby improving the quality of the electrode after winding.

US Pat. No. 7,492,571 B2 discloses a slurry for preparing an electrode of an electric double layer capacitor and a process for preparing the slurry, the slurry comprising: dry mixing of dry carbon particles and dry binder particles, and further One A dry fibrillization step converts the dry binder particles into a fibrous form under a shearing force, and finally adds water to prepare a slurry. Wherein the dry binder particles are fluoropolymer particles, and the dry carbon particles comprise conductive carbon and activated carbon. In this patent, because the fluoropolymer is hydrophobic and floats on the surface of the water, which is not conducive to the fibrillation of the fluoropolymer, the "dry fiberization step" is adopted, and the dry fluoropolymer particles cannot be converted into fibers. The slurry is produced at the same time, so that it takes a lot of production time and cost. Further, in addition to the above disadvantages, the slurry of the patent has only a fibrous fluoropolymer, and the electrode prepared by the slurry causes the conductive layer to peel off from the conductive substrate after winding.

As can be seen from the above description, it is still impossible to obtain a conductive composition capable of optimizing the quality of the electrode after winding by converting the fluoropolymer particles into a fiber shape by the prior art to satisfy the subsequent Apply and reduce production costs.

Therefore, a first object of the present invention is to provide a method for preparing a conductive composition which is formed by converting a plurality of polytetrafluoroethylene particles into a fibrous form in water while forming a plurality of polytetrafluoroethylene particles. A conductive composition of fibrous polytetrafluoroethylene.

Therefore, the method for preparing the conductive composition of the present invention comprises: providing a conductive component and water, the conductive component comprising a water soluble thickener, a plurality of polytetrafluoroethylene particles, activated carbon and a water-soluble adhesive rubber; , mixing with the water-soluble thickener and the polytetrafluoroethylene particles in the conductive component, and then adding activated carbon, and then providing a shearing effect The force is such that the polytetrafluoroethylene particles and the activated carbon are rubbed to transform the polytetrafluoroethylene into a fibrous form, and a conductive composition having a plurality of fibrous polytetrafluoroethylene is formed.

Accordingly, a second object of the present invention is to provide a conductive composition which can optimize the quality of the electrode after winding.

Thus, the conductive composition of the present invention comprises: water and a polymer-containing component, wherein the polymer-containing component comprises a water-soluble thickener, a plurality of fibrous polytetrafluoroethylene, activated carbon, and a water-soluble adhesive. Use rubber.

Accordingly, a third object of the present invention is to provide a method of producing an electrode.

Therefore, the method of the present invention comprises: providing a conductive substrate and a conductive composition as described above; applying the conductive composition to the conductive substrate, and then rolling and drying The conductive composition forms a conductive layer, that is, an electrode is produced.

Therefore, a fourth object of the present invention is to provide an electrode.

Thus, the electrode of the present invention comprises: a conductive substrate; and a conductive layer disposed on the conductive substrate, and the conductive layer is formed of a conductive composition as described above.

The effect of the present invention is that the preparation method of the conductive composition can convert the polytetrafluoroethylene particles into a fibrous shape in water, and the same The conductive composition was obtained. After the electrode made of the conductive composition is wound, the conductive layer formed of the conductive composition does not cause cracks and is not separated from the conductive substrate.

The present invention will be described in detail below. In the present invention, the "electrode" includes a conductive substrate and a conductive layer disposed on the conductive substrate, and the conductive layer is composed of the conductive composition of the present invention. Formed.

"Preparation method of conductive composition"

The components used in the preparation method of the conductive composition will be further described below:

Activated carbon

The nature of the activated carbon is not particularly limited herein, and an appropriate activated carbon may be selected in accordance with the properties of the electrode. Preferably, when the specific surface area of the activated carbon is in the range of 1,000 to 3,500 m ² /g, the conductive layer has a preferable electric capacity.

<Water-soluble adhesive rubber>

The water-soluble adhesive rubber can bond activated carbon in the conductive composition. And the conductive layer can be well adhered to the conductive substrate, so that the conductive layer is not separated from the conductive substrate after the electrode is wound.

The type of the water-soluble adhesive rubber is not particularly limited as long as it is adhesive and water-soluble rubber is suitable for use in the present invention. Preferably, the water-soluble adhesive rubber is selected from the group consisting of polystyrene-butadiene rubber.

Preferably, the water-soluble adhesive rubber is used in an amount ranging from 1 to 12 parts by weight based on 100 parts by weight of the total of the activated carbon. When When the amount of the water-soluble adhesive rubber is less than 1 part by weight, the conductive layer is not adhered well, and the conductive substrate is not adhered well; when the water-soluble adhesive rubber is used in an amount of more than 12 parts by weight, the conductive is increased. The impedance value of the layer.

<polytetrafluoroethylene particles>

These polytetrafluoroethylene particles are rubbed with the activated carbon due to a shear force, and then converted into a fibrous shape. In the conductive composition, the fibrous polytetrafluoroethylene enables the conductive layer to have good flexibility and toughness so that the conductive layer does not crack at the winding portion after the electrode is wound.

The type and nature of the polytetrafluoroethylene particles are not particularly limited herein, for example, modified or unmodified polytetrafluoroethylene particles, as long as they can be converted into fibrous polytetrafluoroethylene under the shearing force. Ethylene particles are suitable for use in the present invention. Preferably, when the average particle diameter of the polytetrafluoroethylene particles is in the range of 10 μm or less, the amount of the polytetrafluoroethylene particles converted into fibers is more; more preferably, the average particles of the polytetrafluoroethylene particles The diameter range is 1 μm or less.

Preferably, the polytetrafluoroethylene particles are used in an amount ranging from 1 to 12 parts by weight based on 100 parts by weight of the total of the activated carbon. If the amount of the polytetrafluoroethylene particles used is less than 1 part by weight, the flexibility and toughness of the conductive layer are insufficient; and if the amount of the polytetrafluoroolefin particles used is more than 12 parts by weight, the resistance value of the conductive layer is increased.

<Water-soluble thickener>

The water soluble thickener has thickening and shaking properties (thixotropic), so that the conductive composition can be separated and precipitated during standing storage, and the conductive composition can be stably present when the conductive composition is coated on the conductive substrate. On a conductive substrate. And since the water-soluble thickener can thicken the water, thereby preventing the polytetrafluoroethylene from floating on the water surface, the polytetrafluoroethylene particles can be converted into a fibrous form in water.

The kind of the water-soluble thickener is not particularly limited herein, and any water-soluble thickener which is soluble in water is suitable for use in the present invention. The water-soluble thickener can be used singly or in combination, such as, but not limited to, sodium carboxymethylcellulose, an ammonium salt of carboxymethylcellulose, methylcellulose or hydroxypropylcellulose. Preferably, the water soluble thickener is sodium carboxymethylcellulose.

Preferably, the water-soluble thickener is used in an amount ranging from 0.5 to 3 parts by weight based on 100 parts by weight of the total of the activated carbon. If the water-soluble thickener is used in an amount of less than 0.5 parts by weight, the thickening effect is insufficient; if the water-soluble thickener is used in an amount of more than 3 parts by weight, the thickening effect is too large, which may result in the subsequent addition of activated carbon. Can not be evenly dispersed.

<Electrical Conductive Materials>

Preferably, the conductive component further comprises a conductive material selected from the group consisting of a conductive polymer, a conductive carbon material, or a combination thereof. The conductive polymer may be used singly or in combination, such as, but not limited to, poly(acetylene), PAC for short, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) (abbreviation) PEDOT: PSS), poly(3,4-ethylenedioxythiophene) [Poly(3,4-ethylenedioxythiophene), PEDOT for short, poly(styrenesulfonate), PSS for short, poly( Para-benzene [Poly(p-phenylene vinylene), abbreviated as PPV]. The conductive carbon material may be used singly or in combination, such as but not limited to: conductive carbon black, graphite, graphene, nano carbon fiber or carbon nanotube, wherein the type of graphite is, for example but not limited to, flake, granular, Slug or tubular.

Preferably, the conductive material is used in an amount ranging from 0 to 20 parts by weight based on 100 parts by weight of the total of the activated carbon. When the amount of the conductive material used is in the range of more than 20 parts by weight, the electrical capacity of the conductive layer may be poor.

<water>

Preferably, the water is used in an amount ranging from 300 to 500 parts by weight based on 100 parts by weight of the total of the conductive components.

Hereinafter, the steps of the method for preparing the electroconductive composition of the present invention will be described in detail: the electroconductive composition of the present invention is prepared by first adding water, a water-soluble thickener in the conductive component, and the polytetrafluoroethylene particles. Mixing, then adding activated carbon, and then providing a shearing force to cause the polytetrafluoroethylene particles and the activated carbon to rub to change the polytetrafluoroethylene from granular to fibrous, and simultaneously form a A conductive composition having a plurality of fibrous polytetrafluoroethylene.

Preferably, the water-soluble adhesive rubber is added before or after the shearing force is provided.

More preferably, the water-soluble adhesive rubber is added after providing the shearing force, and the amount of the polytetrafluoroethylene particles can be converted into a fibrous shape.

Preferably, when the conductive component comprises the conductive material, the guide The electrical material is added after mixing the water, the water soluble thickener, and the polytetrafluoroethylene particles, and prior to providing the shearing force.

Preferably, the water-soluble thickener is used in an amount ranging from 0.5 to 3 parts by weight based on 100 parts by weight of the total of the activated carbon, and the polytetrafluoroethylene particles are used in an amount ranging from 1 to 12 parts by weight. The water-soluble adhesive rubber is used in an amount ranging from 1 to 12 parts by weight.

Preferably, the conductive material is used in an amount ranging from 0 to 20 parts by weight based on 100 parts by weight of the total of the activated carbon.

Preferably, the water is used in an amount ranging from 300 to 500 parts by weight based on 100 parts by weight of the total of the conductive components.

The apparatus or method for providing the shearing force is not particularly limited as long as it can generate a shearing force sufficient to convert the polytetrafluoroethylene particles into a fibrous shape, such as but not limited to: The mixer of the disc type stirring blade, the high speed emulsifier, and the like generate shearing force. The range of the shearing force and the duration of action are determined by the total amount of the conductive component and water.

The method for preparing the conductive composition of the present invention can transform the polytetrafluoroethylene into a fibrous form by rubbing the polytetrafluoroethylene particles and the activated carbon by the shearing force in the water. At the same time, a conductive composition having a plurality of fibrous polytetrafluoroethylenes is obtained. Further, the method for producing the conductive composition of the present invention allows the fibrous polytetrafluoroethylene to be more uniformly dispersed in the conductive composition than the direct use of the fibrous polytetrafluoroethylene to prepare the conductive composition.

Conductive Composition

The conductive composition is produced by the method for producing a conductive composition as described above. The conductive composition comprises: water and a polymer-containing component, wherein the polymer-containing component comprises a water-soluble thickener, a plurality of fibrous polytetrafluoroethylene, activated carbon, and a water-soluble adhesive rubber.

Preferably, the polymer-containing component further comprises a conductive material selected from the group consisting of a conductive polymer, a conductive carbon material, or a combination thereof.

The water-soluble thickener, activated carbon, conductive material, and water-soluble adhesive rubber are as described above, and thus will not be described again. A plurality of fibrous polytetrafluoroethylenes are obtained by converting the polytetrafluoroethylene particles into a fibrous form in the method for producing the conductive composition.

Preferably, the water soluble thickener is sodium carboxymethylcellulose.

Preferably, the water-soluble adhesive rubber is a polystyrene-butadiene rubber.

Preferably, the water-soluble thickener is contained in an amount ranging from 0.5 to 3 parts by weight based on 100 parts by weight of the total of the activated carbon, and the fibrous polytetrafluoroethylene is contained in an amount ranging from 1 to 12 parts by weight. The water-soluble adhesive rubber is contained in an amount of from 1 to 12 parts by weight.

Preferably, the conductive material is contained in an amount ranging from 0 to 20 parts by weight based on 100 parts by weight of the total of the activated carbon.

Preferably, the water is contained in an amount ranging from 300 to 500 parts by weight based on 100 parts by weight of the total of the polymer-containing component.

The fibrous polytetrafluoroethylene in the conductive composition is obtained by converting the polytetrafluoroethylene particles into a fibrous form in the method for producing the conductive composition, and thus is electrically conductive with the direct use of the fibrous polytetrafluoroethylene. Sex group Compared with the product, the fibrous polytetrafluoroethylene can be more uniformly dispersed in the conductive composition. And the conductive layer formed by the conductive composition has sufficient flexibility and toughness, and adheres well to the conductive substrate, so that after the electrode is wound, the conductive layer does not generate cracks, and the conductive layer and the conductive substrate are not Will separate.

"Method of making electrodes"

Hereinafter, the method for producing the electrode of the present invention will be described in detail. The method for producing an electrode of the present invention comprises applying a conductive composition as described above onto a conductive substrate, and then applying the method by first drying and then rolling. The conductive composition on the conductive substrate forms a conductive layer, that is, an electrode is produced.

Preferably, the temperature during rolling is in the range of 25 ° C to 150 ° C. If the rolling temperature exceeds 150 ° C, the adhesion of the water-soluble adhesive rubber in the conductive composition is affected.

The material of the conductive substrate is, for example but not limited to, aluminum, copper or aluminum copper alloy. The conductive substrate has a thickness of 5 to 30 μm.

The method of applying the conductive composition is, for example but not limited to, roll coating, spray coating, or the like.

The drying temperature ranges from 40 to 100 °C.

Specific means of drying are, for example but not limited to, hot air drying, infrared drying or microwave drying, and the like.

The electrode of the present invention can be used as an electrode of an electric double layer capacitor.

The present invention will be further illustrated by the following examples, but it should be understood that this embodiment is intended to be illustrative only and not to be construed as limiting.

<Example>

[Example 1] Conductive composition and electrode

Preparation method using conductive composition I: 3 parts by weight of carboxymethyl cellulose was added to a mixer with a disc stirring blade (IKA EUROSTAR digital DC mixer, stirring blade No. 10, ψ 40 mm) Sodium (H-1496A from Dai-ichi Kogyo Seiyaku Co.), 350 parts by weight of water, and 6 parts by weight of polytetrafluoroethylene particles (CAS No. 9002-84-0 of Sigma-Aldrich.) were added to 10 Parts by weight of conductive carbon (Super P ^{® of} Timcal.) and 100 parts by weight of activated carbon (ACS2000 of Sinosteel Carbon Co., Ltd.), and then a shearing force is generated by the mixer with disc stirring blades ( After the action time: 1 hour), 6 parts by weight of polystyrene-butadiene rubber (TRD-102A of JSR., solid content: 48% by weight) was added and uniformly mixed, that is, the conductive composition of Example 1 was obtained. .

The conductive composition of Example 1 was coated on a conductive substrate (material: aluminum, thickness 30 μm), and dried first by hot air at 85 ° C, and then rolled at a temperature of 80 ° C to make the conductive substrate. The conductive composition forms a conductive layer, that is, an electrode is produced.

[Comparative Examples 1 to 3] Conductive Composition and Electrode

Comparative Examples 1 to 3 differ from Example 1 in that the amounts of the components are different, or the preparation method of the conductive composition is used, as shown in Table 1. And Table 2 is shown.

The preparation methods of the electrodes of Comparative Examples 1 to 3 were the same as those of the electrode of Example 1.

[evaluation project]

1. Fibrous PTFE detection

The electrodes of Example 1 and Comparative Examples 1 to 3 were examined by a scanning electron microscope (manufactured by ZEISS, model: Auriga), and it was observed whether or not fibrous polytetrafluoroethylene was contained in the conductive layer of the electrode. When fibrous polytetrafluoroethylene is contained, the result of the detection of the fibrous polytetrafluoroethylene is marked as "○"; otherwise, it is referred to as "x". The results are shown in Table 2.

2. Electrode winding test

A round bar having a diameter of 1 mm was taken, and the electrodes (size: 10 mm × 100 mm) of Example 1 and Comparative Examples 1 to 3 were wound three times in the axial direction of the round bar, respectively. It is observed whether the conductive layer is cracked after the winding of the electrodes, and whether the conductive layer is separated from the conductive substrate. If the conductive layer is not cracked and is not separated from the conductive substrate, the electrode winding test result is marked as "○"; if the conductive layer is cracked but not separated from the conductive substrate, the electrode winding test result is recorded as "△"; If the conductive layer is cracked and separated from the conductive substrate, the electrode winding test result is indicated as "x". The results are shown in Table 2.

3. The density of the conductive layer

Hereinafter, the measurement of the density of the conductive layer by the electrode of Example 1 was carried out, and the electrodes of Comparative Examples 1 to 3 were measured in the same manner.

The thickness of the conductive layer of the electrode (area: 1.3273 cm ² ) of Example 1 was first measured by a thickness gauge (manufacturer: Mitutoyo, model: ID-C112EXBS). 6 or more electrodes of Example 1 were vacuum dried at 120 ° C and a vacuum of 5 × 10 ^-3 torr for 2 hours, and then cooled in a vacuum environment, and weighed in an environment of 5 ppm of water and oxygen, and The average weight of the electrode sheets was calculated. After the obtained average weight was deducted from the weight of the conductive substrate, the density of the conductive layer of the electrode of Example 1 was obtained by dividing the thickness.

3. Conductive layer unit volume capacitance

Hereinafter, the measurement of the unit volume capacitance of the conductive layer will be described with the electrode of Example 1, and the electrodes of Comparative Examples 1 to 3 were measured in the same manner.

The electrode of the first embodiment was used as a positive electrode and a negative electrode of a CR2032 button type electric double layer capacitor for packaging and testing. The electrodes of the positive electrode and the negative electrode are all 1.3273 cm ² , and the positive and negative electrodes are separated by a cellulose separator having a thickness of 35 μm, and the electrolyte is a 1 M tetraethylammonium tetrafluoroborate propylene carbonate solution (solute is tetraethylammonium) Tetrafluoroborate, referred to as TEABF ₄ , is commercially available under the trade name Alfa Aesar, CAS No. 429-06-1; the solvent is propylene carbonate, PC for short, and the trade name is Alfa Aesar CAS No. 108-32-7). The capacitance measurement of the electric double layer capacitor was performed by DC charging and discharging with a charging and discharging current of 0.04 A, the saturated charging voltage was 2.7 V, the discharge target voltage was 1.35 V, and the capacitance of the electrode of Example 1 was calculated according to the following formula. :

C(F) is the capacitance of the electrode, the unit is Farah (F); I is the discharge current, the unit is ampere (A); Δt is the time required for the electric double layer capacitor to discharge from the saturated charging voltage to the discharge target voltage, unit It is seconds (sec); ΔV is the potential difference between the saturated charging voltage and the discharge target voltage, and the unit is volt (V). The unit volume capacity (F/cm ³ ) of the electrode of Example 1 is the capacitance of the electrode divided by the volume of the electrode, wherein the volume of the electrode is the thickness of the electrode conductive layer measured by the thickness multiplied by the electrode The value of the area (1.3273 cm ² ).

As can be seen from the results of Table 2, Comparative Examples 1 to 2 and Examples were compared. 1. In Comparative Examples 1 and 2, since the conductive composition does not have both polystyrene-butadiene rubber, fibrous polytetrafluoroethylene, and sodium carboxymethylcellulose, the conductive layer is cracked after the electrode is wound and The conductive substrate is separated. In Comparative Example 2, since the polystyrene-butadiene rubber was not used, the conductive layer could not adhere to the conductive substrate, and measurement of the electrode properties could not be performed. In the first embodiment, the conductive composition has both polystyrene-butadiene rubber, sodium carboxymethylcellulose, and fibrous polytetrafluoroethylene, so that the conductive layer does not crack and does not conduct electricity after the electrode is wound. The substrate is separated.

Comparing Comparative Example 3 with Example 1, Comparative Example 3, because the order of addition of activated carbon and conductive carbon was in front of the polytetrafluoroethylene particles (Preparation Method II of the conductive composition), the polytetrafluoroethylene particles were converted into a fibrous shape. The degree is not good, which leads to cracking of the conductive layer after the electrode is wound. In contrast, in the first embodiment, since the order of addition of the polytetrafluoroethylene particles is before the activated carbon and the conductive carbon (the preparation method I of the conductive composition), the degree of conversion of the polytetrafluoroethylene particles into a fibrous form in water is high, thereby making After the electrode is wound, the conductive layer does not crack and is not separated from the conductive substrate.

In summary, the method for preparing the conductive composition of the present invention uses a water-soluble adhesive rubber, a plurality of polytetrafluoroethylene particles and a water-soluble thickener, and a water-soluble solution in the conductive component. The thickener and the polytetrafluoroethylene particles are mixed and then added with activated carbon, so that the polytetrafluoroethylene can be converted from granular to fibrous in water, and at the same time, a plurality of fibrous materials are obtained. The conductive composition of polytetrafluoroethylene and the electrode obtained by using the conductive composition in the subsequent stage, the conductive layer formed of the conductive composition after winding does not cause cracks and does not Separating from the conductive substrate, the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

Claims (13)

A method for preparing a conductive composition, comprising: providing a conductive component and water, the conductive component comprising a water-soluble thickener, a plurality of polytetrafluoroethylene particles, activated carbon, and a water-soluble adhesive rubber; The water-soluble thickener in the conductive component and the polytetrafluoroethylene particles are first mixed, and then the activated carbon is added, and then a shearing force is provided to cause the polytetrafluoroethylene particles and the activated carbon to rub. And transforming the polytetrafluoroethylene into a fibrous form, and forming a conductive composition having a plurality of fibrous polytetrafluoroethylenes; wherein, based on 100 parts by weight of the total of the activated carbons, The water-soluble thickener is used in an amount ranging from 0.5 to 3 parts by weight, and the polytetrafluoroethylene particles are used in an amount ranging from 1 to 12 parts by weight, and the water-soluble adhesive rubber is used in an amount ranging from 1 to 12 parts by weight. . The method for producing a conductive composition according to claim 1, wherein the water-soluble adhesive rubber is added before or after the shearing force is supplied. The method for producing a conductive composition according to claim 2, wherein the water-soluble adhesive rubber is added after providing the shearing force. The method for producing a conductive composition according to claim 1, wherein the water is used in an amount ranging from 300 to 500 parts by weight based on 100 parts by total of the total of the conductive components. The method for preparing a conductive composition according to claim 1, wherein the conductive component further comprises a conductive material selected from the group consisting of a conductive polymer, a conductive carbon material, or a combination thereof. The method for producing a conductive composition according to claim 5, wherein the conductive material is used in an amount ranging from 0 to 20 parts by weight based on 100 parts by weight of the total of the activated carbon. The method for producing a conductive composition according to claim 5, wherein the conductive material is added after mixing water, a water-soluble thickener, and the polytetrafluoroethylene particles, and before providing the shearing force. . A conductive composition comprising: water and a polymer-containing component, wherein the polymer-containing component comprises a water-soluble thickener, a plurality of fibrous polytetrafluoroethylene, activated carbon, and a water-soluble adhesive rubber Wherein the content of the water-soluble thickener ranges from 0.5 to 3 parts by weight, and the content of the fibrous polytetrafluoroethylene ranges from 1 to 12 parts by weight, based on 100 parts by weight of the total of the activated carbon, The water-soluble adhesive rubber is contained in an amount of from 1 to 12 parts by weight. The conductive composition according to claim 8, wherein the water is contained in an amount ranging from 300 to 500 parts by weight based on 100 parts by total of the polymer-containing component. The conductive composition according to claim 8, wherein the polymer-containing component further comprises a conductive material selected from the group consisting of a conductive polymer, a conductive carbon material, or a combination thereof. The conductive composition according to claim 10, wherein the conductive material is contained in an amount ranging from 0 to 20 parts by weight based on 100 parts by weight of the total of the activated carbon. An electrode preparation method comprising: Providing a conductive substrate and the conductive composition according to any one of claims 8 to 11, wherein the conductive composition is coated on the conductive substrate, and then dried by rolling and then pressed The conductive composition forms a conductive layer, that is, an electrode is produced. An electrode comprising: a conductive substrate; and a conductive layer disposed on the conductive substrate, the conductive layer being dried by the conductive composition according to any one of claims 8 to 11 The rear roll is formed.