KR100917408B1 - Electrode for electrochemical capacitor and process for preparing the same - Google Patents

Abstract

The present invention relates to an improved electrode for an electrochemical capacitor and a method of manufacturing the same, by using a binder having superior physical properties and thermal stability as compared to the prior art, it is possible to increase the density of the electrode by increasing the density of the electrode, and to improve the heat resistance and coating By increasing the temperature and drying temperature, the present invention provides an electrode for an electrochemical capacitor, which can expect productivity improvement and stable capacitor life.

Electrochemistry, Capacitors, Electrodes

Description

Electrode for electrochemical capacitor and manufacturing method therefor {Electrode for electrochemical capacitor and process for preparing the same}

The present invention relates to an electrode for an electrochemical capacitor and a method of manufacturing the same, and more particularly, by using a binder for an electric double layer capacitor having excellent physical properties and thermal stability in place of a water-soluble cellulose polymer having a low thermal decomposition temperature. The present invention relates to an electrode for an electrochemical capacitor and a method of manufacturing the same, which can increase the density of an electrode to increase a capacitor, improve heat resistance, and improve productivity by increasing a coating temperature and a drying temperature.

Electrochemical capacitors consist of two electrodes, which are generally divided into symmetrical capacitors and asymmetrical capacitors depending on the type of electrode configuration. The symmetrical capacitor uses a plurality of activated carbon electrodes, and has an electric double layer capacitor having a double layer capacitance generated at an interface between each electrode and a liquid electrolyte, and the above electrostatic capacitance. It can be divided into a pseudocapacitor having a pseudocapacitance with a redox. Since the electric double layer capacitor generates charge and discharge by using the physical reaction of adsorption and desorption of ions on the surface of the active material, there is an advantage that the output can be high and have a semi-permanent lifetime. The active material may be a material such as activated carbon powder, activated carbon fiber, carbon nanotube, carbon aerogel, or the like. Similar capacitors have the advantage that their capacity is three to four times larger than electric double layer capacitors. However, since expensive metal oxides or limited conductive polymers are used as electrode active materials, there are manufacturing difficulties and they have not yet become common due to high internal resistance.

Asymmetrical capacitors (Hybrid Capacitors) have one layer of double layer capacitance using activated carbon electrodes, and the other poles (a) Ru, Rh, Pd, Ta, Os, Mo, Mn, Ni, Co, Ir, W, V; (b) alloys, oxides, nitrides, carbides, hydroxides of at least two metals of Ru, Rh, Pd, Ta, Os, Mo, Mn, Ni, Co, Ir, W, and V; (c) doped conductive polymers; (d) Consists of at least one selected from graphite-based carbons containing lithium ions, and exhibits paradaic peudocapacitive behaviors due to redox reactions. Although the capacity of the symmetrical capacitor is overcome, the output characteristic is superior to the battery while overcoming the disadvantage, but the lifespan is shorter than the symmetrical capacitor.

Two of the most widely used methods of manufacturing electrodes for electrochemical capacitors using activated carbon are known. One method is to prepare a paste in which an active material and a conductive material and a binder are mixed, and then compress and attach the paste to a current collector. The other method is to make a slurry in which the active material and the conductive material are mixed with a binder and then apply it onto the current collector.

Among these, the method of manufacturing an electrode by apply | coating a slurry has a comparatively simple work process, and does not have a big process equipment cost. In addition, there is an advantage that the internal resistance is relatively low, compared to the method of attaching the crimped electrode using a separate conductive adhesive. For this reason, the electrode manufacturing method by applying a slurry is most widely used to manufacture the electrode for electrochemical capacitors.

In the method of forming an electrode of an electrochemical capacitor by applying a slurry, the active material and the active material and the active material and the current collector are bound by the above binder while applying and drying the slurry containing one or more binders on the current collector. . The binder is one of the important factors that determine the performance as a capacitor. If the performance of the binder is poor or the electrode does not contain the proper amount, it is difficult to form a uniform thickness film when applying the electrode, and even after the capacitor is formed, the active material is dropped from the active material or current collector to lower the capacity of the capacitor or increase the internal resistance. Done. On the other hand, when the amount of the binder is excessively large, the amount of the active material in the electrode is reduced, causing a decrease in the capacity of the capacitor, or an increase in the internal resistance due to the electrical properties of the polymer, which is mostly an electrical insulator.

Conventionally, the most typical binder used in manufacturing an electrochemical capacitor electrode is cellulose-based carboxymethyl cellulose (CMC). Japanese Unexamined Patent Application Publication No. 191-280518 proposes an electric double layer capacitor electrode manufacturing method in which carboxymethyl cellulose is dissolved in water, and a slurry prepared after mixing and dispersing activated carbon is applied to an aluminum current collector. Carboxymethylcellulose is a binder often used to increase viscosity. It also serves to disperse the active material in the aqueous system, and has been widely used as an important binder for bonding between the active material and the active material, the active material and the current collector. However, there is a limit to increase the film drying temperature after the pyrolysis temperature is less than 250 ℃, the temperature during the drying process to properly remove the adsorption water in the pores of the activated carbon is also limited. In addition, the binder is brittle after drying. When the electrode is wound after application, the coating film may be cracked or peeling phenomenon may occur. That is, it can be a cause of reducing the lifespan as an electrochemical capacitor capable of maintaining a stable internal resistance. Finally, the density of the active material tends to decrease after slurry application due to the properties of cellulose forming the network structure. This causes a decrease in the capacitance of the capacitor due to the decrease in the electrode density.

In addition, Korean Patent Laid-Open Publication No. 2001-84422 has proposed a method of mixing the above binder and butadiene styrene together. This has been proposed as a countermeasure because the flexibility of the electrode is inferior with the existing carboxymethyl cellulose alone. Since butadiene styrene is composed of small particles of about 130 nm, the butadiene styrene plays a role of inducing the bonding by the point contact between the active material and the active material, and the current collector, and thus is very effective in increasing the strength of the electrode. However, if the content in the electrode is too high, it causes a sharp increase in internal resistance and accompanied by a decrease in capacity due to the decrease in the active material content.

In order to solve such a conventional problem, the inventors have used N vinyl acetamide polymer having excellent thermal stability and dispersibility as a binder for an electrochemical capacitor, and as a result, it is possible to increase the density of the electrode to increase the capacity of the capacitor and to improve heat resistance. By increasing the coating temperature and the drying temperature, it was confirmed that the productivity and the stable capacitor life in the electrode production can be provided.

While the glass transition temperature of most binders for electrochemical capacitors is -100 ° C to 100 ° C or less, the glass transition temperature of the N vinyl acetamide-based binder is 160 ° C or more. The present inventor has found that the conventional problem can be solved by using a binder composed of the N vinyl acetamide polymer.

Therefore, an object of the present invention is to increase the density of the electrode to increase the capacity of the capacitor, improve the heat resistance to increase the coating temperature and drying temperature for the electrochemical capacitor that can provide a high productivity and stable capacitor life in electrode manufacturing It is to provide an electrode and a method of manufacturing the same.

In order to achieve the above object, the present invention provides an electrochemical capacitor electrode in which a composition containing an active material, a conductive material and a binder is applied to a current collector, wherein the binder comprises an N vinyl acetamide polymer. An electrode for a capacitor is provided.

In the present invention, it is preferable that the binder further comprises butadiene styrene in order to improve physical properties such as flexibility.

In the present invention, the glass transition temperature of the binder is preferably higher than 160 ℃ higher than the conventional binder, preferably a binder having a glass transition temperature of 350 ℃.

In the present invention, it is preferable that the binder is included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the active material, and as a binder, 1 to 10 parts by weight of N vinyl acetamide polymer and 1 to 10 parts by weight of butadiene styrene may be used. have.

The capacitor to which the electrode of the present invention is applied may be an electric double layer capacitor having a plurality of symmetrical electrodes or a hybrid capacitor having a plurality of asymmetrical electrodes.

The electric double layer capacitor to which the electrode of the present invention is applied is composed of active carbon powder, activated carbon fiber, carbon nanotube, carbon aerogel, or a combination of these materials, both of which are active materials of both electrodes, and the capacity of one electrode is higher than that of the other electrode. It is preferred to have a capacity of 1 to 3 times.

In the hybrid capacitor to which the electrode of the present invention is applied, the active material of one electrode is composed of activated carbon powder, activated carbon fiber, carbon nanotube, carbon aerogel, or a combination of these materials, and the other electrode is (a) Ru, Rh, Pd, Ta, Os, Mo, Mn, Ni, Co, Ir, W, V; (b) alloys, oxides, nitrides, carbides, hydroxides of at least two metals of Ru, Rh, Pd, Ta, Os, Mo, Mn, Ni, Co, Ir, W, and V; (c) doped conductive polymers; (d) It is comprised from 1 or more types chosen from the graphite carbon in which lithium ion was inserted, and it is preferable that the capacity | capacitance of one electrode has 10 times or more compared with the other electrode.

The present invention also provides a method for producing an electrode for an electrochemical capacitor comprising an active material, a conductive material, a binder for attaching the active material and the conductive material to a current collector, a solvent for dispersing the active material, and a dispersant.

Specifically, the electrode manufacturing method of the present invention comprises the steps of mixing the active material, conductive material and binder to form a slurry; And applying the slurry to the current collector to form an electrode, wherein as the binder, N vinyl acetamide polymer, butadiene styrene or a mixture thereof can be used.

According to the present invention, by using N vinyl acetamide polymer instead of carboxymethyl cellulose which has been used as a binder of a conventional electrochemical capacitor, the electrode density can be increased by 12% or more and the ESR (Equivalent Series Resistance) life characteristics are also increased. It can be improved by 2 times. Most importantly, due to the fact that the amount of solvent is reduced by 68% and the stability at high temperature is improved compared to the prior art, the production process time can be shortened and water inside the activated carbon can be efficiently removed, which is also useful for the life of the capacitor. The fact is that it has the advantage to improve. That is, the problem of large capacity, low cost, and long life of the electrochemical capacitor can be solved.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a manufacturing process diagram of an electrode for an electrochemical capacitor according to the present invention, the manufacturing process is the first mixing step (1), the second mixing step (2), slurry manufacturing step (3), current collector coating step (4) , Electrode drying step (5).

First, activated carbon 1a and conductive material 1b are mixed as an active material, which is a dry mixing process. In addition to the activated carbon powder, materials such as activated carbon fibers, carbon nanotubes, and carbon aerogels may be used as the active material.

The activated carbon 1a is preferably selected from an average particle diameter of 1 to 100 µm and a specific surface area of 500 to 3000 m 2 / g. More preferably using an activated carbon having an average particle diameter of 1 to 50 µm, a specific surface area of 1000 to 3000 m 2 / g, most preferably an average particle diameter of 1 to 10 µm, and a specific surface area of 2000 to 3000 m 2 / g, Preferred starting materials are phenol, pitch, coke, bamboo, charcoal, palm husk, sugar and the like.

The conductive material 1b is made of fine conductive powder, such as Ketjen Black, acetylene black, graphite powder, which are smaller than the average particle diameter of activated carbon. The fine conductive powder material is located between the activated carbon gaps and serves to smooth the flow of electrons, the amount of which is preferably 1 to 30 parts by weight, more preferably 3 to 20 parts by weight based on 100 parts by weight of activated carbon. Inject wealth. If the input amount is too small, the capacitance of the capacitor may increase, but the internal resistance also increases rapidly, and the density decreases, thereby decreasing the strength of the electrode. On the other hand, if too much input, the internal resistance of the capacitor can be reduced, but the appropriate amount is required because the content of the activated carbon is reduced and the cell capacity is reduced.

Next, after the dry mixing of the activated carbon 1a and the conductive material 1b, the binder 2b for stably applying to the current collector is wet mixed with the solvent 2a. This process produces a slurry (3).

Distilled water or the like may be used as the solvent 2a.

As the binder (2b), butadiene styrene, the N vinyl acetamide-based polymer provided in the present invention, and the like can be used, including carboxymethyl cellulose used in the prior art.

The binder (2b) is preferably contained 1 to 20 parts by weight based on 100 parts by weight of the active material, 1 to 10 parts by weight of N vinyl acetamide polymer and 1 to 10 parts by weight of butadiene styrene can be used as a binder. have.

In particular, the content in the electrode of the N vinyl acetamide polymer is preferably 1 to 5 parts by weight based on 100 parts by weight of activated carbon. The content of butadiene styrene is preferably 1 to 10 parts by weight, more preferably 1 to 5 parts by weight based on 100 parts by weight of activated carbon.

N-vinyl acetamide-based polymer is a binder having excellent physical properties and thermal stability. In the present invention, by using a binder comprising a N-vinyl acetamide-based monomer unit and having a glass transition temperature of 160 ° C. or higher, a conventional problem It was found that can solve. The content in the electrode is preferably 1 to 10 parts by weight based on 100 parts by weight of activated carbon. More preferably 1 to 5 parts by weight. This binder has a relatively low water absorption compared to carboxymethylcellulose when compared. Less water is also excellent in dispersing the active material in the slurry. In other words, the amount of water to obtain the same slurry viscosity is small. This can be expected to increase the electrode density after coating. In addition, since the amount of water in the slurry is small, the drying time can also be shortened. Therefore, by using the N vinyl acetamide-based binder, it is possible to increase the capacitor density by increasing the electrode density, and increase the productivity due to the shortening of the drying time. Finally, the N vinyl acetamide-based binder has a thermal decomposition temperature of 350 ° C. or higher, which is much higher in temperature stability than carboxymethyl cellulose. This can greatly increase productivity by increasing the drying temperature after application, thus greatly improving productivity. It is also advantageous to shorten the drying time by increasing the drying temperature for effectively removing the adsorbed moisture in the pores of activated carbon.

Next, the slurry is applied to the metal current collector (4). As the metal current collector, almost all metal thin films such as Al, Cu, and Ni may be used, but the current collector most widely used in an electrochemical capacitor is an Al current collector. In order to increase the adhesion between the electrode and the current collector, the current collector may be etched with chemicals to increase the surface area, or the surface may be roughened by physical friction. The thickness of the above metal current collector is preferably 10 to 100 μm, and if it is too thin, it may be difficult to support the weight of the electrode when applied. On the other hand, if the thickness is too thick, the internal current collector volume becomes large, so that the electrode content is relatively high. As a result of the shrinkage, there is a disadvantage in that the capacity falls.

Next, the electrode is dried immediately after application (5). The drying temperature may vary depending on the thickness and width of the coating film and the amount of solvent in the slurry. It may also vary depending on the thermal stability of the binder.

Hereinafter, an electrochemical capacitor electrode and a method of manufacturing the same according to preferred embodiments of the present invention will be described in detail, but the present invention is not limited or limited by the following embodiments.

EXAMPLES / COMPARATIVE EXAMPLE

To 100 parts by weight of activated carbon powder (average particle diameter 10 μm, specific surface area 2300 m 2 / g), a certain amount of carboxymethyl cellulose, N vinyl acetamide polymer and / or butadiene styrene in which a part is substituted with Na ions as shown in Table 1 The slurry was prepared, and then applied to an Al current collector (thickness 20 μm) to prepare an electrode. At this time, 10 parts by weight of acetylene black (average particle diameter 1 μm or less) was added to 100 parts by weight of activated carbon as the conductive material, 300 parts by weight of distilled water was used as the solvent, and the coating film was formed to a thickness of 250 μm.

Carboxymethyl Cellulose (part by weight) N vinyl acetamide polymer (parts by weight) Butadiene Styrene (parts by weight) Comparative Example 1 2 0 0 Comparative Example 2 4 0 0 Comparative Example 3 2 0 2 Comparative Example 4 2 0 4 Example 1 0 2 0 Example 2 0 4 0 Example 3 0 2 2 Example 4 0 2 4

[Test Example 1]

For the electrodes of Examples 1 and 2 and Comparative Examples 1 and 2, the processability and the properties of the coating film were compared. Specifically, the electrode strength and flexibility by weight were tested.

Electrode strength test was measured by a coating film strength tester (RHESCA; FPR-2000), the measuring method is as follows. Referring to FIG. 2, first, the surface of the coating film was pressed with the compression ball 8 on the coating film 7 having a width of 3 cm and a length of 4 cm. At this time, the load 11 was 500 g and rotated by 10 revolutions per minute in the counterclockwise direction. The test time was 120 seconds, and scratches were formed on the coating film after a certain time while the scratches in the shape of circles (9) were drawn. The electrode strengths were compared by the time when the first crack occurred. The zero point was adjusted with the intermediate support 10 and the relative load 6.

In the flexibility test, the electrode 12 coated as shown in FIG. 3 was bent to compare the presence of cracks in the coating film. When the coating film was peeled from the current collector by the flexibility evaluation in this test, it was indicated by × (weak flexibility), and when fine cracks occurred, △, and when no cracks occurred, they were indicated by ○ (good flexibility). The thickness of the coating film was 250 µm.

Electrode strength (sec) flexibility Comparative Example 1 One × Comparative Example 2 30 × Example 1 13 △ Example 2 27 △

As shown in the test results of Table 2, it can be seen that the electrode strength increases as the amount of the binder increases. Although both binders were not good in terms of flexibility, they were completely peeled off from the conductor for the carboxymethylcellulose-only electrode (Comparative Example), whereas for the electrode (Example) with only N vinyl acetamide polymer added Only occurred.

[Test Example 2]

The electrode strength and flexibility by weight were tested for the electrodes of Examples 3 and 4 and Comparative Examples 3 and 4, and the test method was the same as in Test Example 1.

Electrode strength (sec) flexibility Comparative Example 3 18 △ Comparative Example 4 52 ○ Example 3 29 ○ Example 4 43 ○

As shown in the test results of Table 3, butadiene styrene was added to increase the electrode strength compared to Test Example 1. In addition, as the amount of butadiene styrene added increased, the electrode strength also increased. Also in the flexibility test results, it was observed that the flexibility was significantly improved compared to Test Example 1 with the addition of butadiene styrene. However, in Comparative Example 3, only 2 parts by weight of butadiene styrene had a limit in increasing electrode flexibility. That is, the carboxymethyl cellulose was confirmed to be less flexible than the N vinyl acetamide polymer.

[Test Example 3]

In Table 3 of Test Example 2, changes in electrode strength for each drying temperature were compared with respect to the electrodes of Comparative Example 4 and Example 4 having good flexibility, and the results are shown in FIG. 4. In FIG. 4, reference numeral 13 denotes a result of drying the electrode of Comparative Example 4 for 12 hours, and reference numeral 14 denotes a result of drying the electrode of Comparative Example 4 for 24 hours. (15) is the result of drying the electrode of Example 4 for 12 hours, and finally (16) is the result of drying the electrode of Example 4 for 24 hours. Drying was carried out at -1 atmosphere (-760 mmHg).

In the case of carboxymethyl cellulose (13, 14) in Figure 4 it can be seen that the electrode strength sharply decreased as the drying temperature increases. In addition, it can be seen that the longer the drying time, the more accelerated the decrease in electrode strength with drying temperature. On the other hand, for N vinyl acetamide polymers (15, 16), it showed relatively stable electrode strength with drying temperature and drying time.

Figure 5 is a comparison of the thermal decomposition temperature of the carboxymethyl cellulose substituted with Na ions and N vinyl acetamide polymer, using a thermogravimetric analysis method, at 5 ℃ per minute in nitrogen (N ₂ ) atmosphere The mass change of each binder was observed while heating up to 500 degreeC by the speed | rate.

In Fig. 5, reference numeral 17 denotes a weight change of carboxymethylcellulose, and 18 denotes a weight change of N vinyl acetamide polymer. As a result of this, carboxymethylcellulose began to pyrolyze at about 250 ° C and N vinyl acetamide polymer began to degrade at about 350 ° C. In other words, it was confirmed that the N vinyl acetamide polymer had excellent thermal stability by about 100 ° C.

This can be a significant advantage in producing electrochemical capacitors. First, productivity can be increased by shortening the process time. Immediately after the slurry is applied to the current collector, a drying process for evaporating the solvent is performed. If the drying temperature is increased, the application time can be shortened. Second, moisture removal in activated carbon is advantageous. Activated carbon absorbs moisture in the air because of its excellent adsorption performance. If this moisture is not removed well, the moisture acts as a large factor causing side reactions in the electrochemical capacitor. Gas generation due to this side reaction can shorten the life of the capacitor. Therefore, activated carbon electrodes for electrochemical capacitors require a drying process prior to assembly. At this time, the N vinyl acetamide polymer has a higher temperature stability than carboxymethyl cellulose, so that the drying temperature can be increased to increase efficiency.

[Test Example 4]

Two slurries were added to the activated carbon powders in the same ratio, and the binders were prepared. The viscosity was checked, and the electrode density was observed after the coating. The results are shown in Table 4 below. Water was used as the solvent and the amount of water was adjusted in each experiment to achieve a similar viscosity. Slurry viscosity was measured using a viscometer of BROOKFIELD (44DV-II + PRO VISCOMETER), and recorded about 3 minutes after the value was stabilized.

Solvent (g) Viscosity (cP) Electrode Density (g / cm 3) Comparative Example 4 200 1680 0.48 Example 4 135 1515 0.54

As shown in Table 4, the slurry to which carboxymethylcellulose was added had a viscosity of 1680 cP when 200 g of water was added, whereas the slurry to which N vinyl acetamide polymer had a similar level of 135 g of water was added. It did not take outside. This is about 68% compared to Comparative Example 4.

6 shows the viscosity stability of the slurry, reference numeral 19 denotes a change in viscosity of the slurry to which carboxymethylcellulose is added, and 20 denotes a change in viscosity of the slurry to which the N vinyl acetamide polymer is added. As a result of 24 hours, it was observed that there was no difference in slurry stability by the two additives. In other words, the N vinyl acetamide polymer was able to produce a stable slurry even with a small amount of water, which shows an advantageous effect compared to conventional carboxymethylcellulose in two aspects.

First is the fact that the electrode density increases after drying due to the uniform and stable dispersibility of the active material with a small amount of solvent. As can be seen in Table 4, in Example 4, the electrode density was increased by about 12% compared to Comparative Example 4. This indicates that a capacity increase can be expected when constructing an electrochemical capacitor cell.

Second, since the amount of solvent in the slurry is small, the drying process time after coating can be shortened. In other words, productivity can be improved due to the shortening of the process time. Under the same drying conditions, it is expected that the drying time by 68%, which is equivalent to the reduction ratio of the solvent amount, will be shortened.

[Test Example 5]

The cell was produced using the electrode apply | coated with the slurry of the comparative example 4 and the example 4, and the performance was observed. The cell was made into a cylindrical type having a diameter of 18 mm, the electrode thickness was made to 200 ㎛. An acetonitrile (AN) organic electrolyte to which 1 M of TEABF ₄ was added was used. After testing the initial performance, the life test was performed in an oven at 70 ℃ after applying at 2.7 V. Performance checks were performed after 200 and 500 hours, respectively.

Capacity (F) ESR (mΩ) % Increase in ESR after 500 hours Comparative Example 4 70 16.0 80 Example 4 88 15.5 40

As a result of the test, as can be seen in Table 5, the capacity of the electrode of the N-vinyl acetamide polymer is added, the capacity of about 12% higher than the cell of the electrode of the carboxymethyl cellulose was measured. This is the same value as the ratio of the electrode density in Test Example 4. That is, it was found that the capacity of the electric double layer capacitor also increased with the increase of the electrode density. ESR also decreased by about 3%. More importantly, the results of life test can be seen.

Figure 7 shows the life test results. Reference numerals 21 and 22 denote changes in capacitance of Comparative Examples 4 and 4, and reference numerals 23 and 24 denote changes in ESR of Comparative Examples 4 and 4. As a result, the dose reduction rate according to the difference between the two binders was almost the same. This is because the capacity of an electrochemical capacitor depends on the activated carbon. However, ESR yielded much more stable results in Example 4. Compared to Comparative Example 4, the ESR increase rate of Example 4 was measured at half level. This is considered to be because the electrochemical stability of the N vinyl acetamide polymer is superior to carboxymethyl cellulose. That is, when used for a long time in harsh conditions, excellent life characteristics can be expected in a cell made of an electrode added with N vinyl acetamide polymer, compared to a cell made of an electrode to which a conventional carboxymethyl cellulose is added.

1 is a manufacturing process chart of the electrode for the electrochemical capacitor according to the present invention.

2 shows the electrode strength test.

Figure 3 shows the electrode bent for flexibility test.

Figure 4 is a graph comparing the change in electrode strength for each electrode of the Example and Comparative Example drying temperature.

5 is a graph comparing pyrolysis temperatures of carboxymethylcellulose and N vinyl acetamide polymers.

6 is a graph comparing viscosity stability with respect to the slurry of the Example and Comparative Example.

7 is a graph showing the life test results of the electrodes of the Examples and Comparative Examples.

Claims (10)

In the electrode for an electrochemical capacitor coated with a composition comprising an active material and a binder, Electrode for an electrochemical capacitor, characterized in that the binder comprises N vinyl acetamide polymer, 1 to 20 parts by weight based on 100 parts by weight of the active material. The electrode of claim 1, wherein the binder further comprises butadiene styrene. The electrode for an electrochemical capacitor according to claim 1, wherein the binder has a glass transition temperature of 160 ° C or higher. delete The electrode for an electrochemical capacitor according to claim 2, wherein 1 to 10 parts by weight of N vinyl acetamide polymer and 1 to 10 parts by weight of butadiene styrene are used with respect to 100 parts by weight of the active material as a binder. The electrode of claim 1, wherein the capacitor is an electric double layer capacitor having a plurality of symmetrical electrodes or a hybrid capacitor having a plurality of asymmetrical electrodes. The method of claim 6, wherein the electric double layer capacitor is composed of an active carbon powder, activated carbon fiber, carbon nanotubes, carbon aerogels or a combination of these materials, both of the active material of the two electrodes, the capacity of one electrode compared to the other electrode 1 Electrochemical capacitor electrode, characterized in that having a capacity of three to three times. 7. The hybrid capacitor of claim 6, wherein the active material of one electrode consists of activated carbon powder, activated carbon fiber, carbon nanotube, carbon aerogel, or a combination of these materials, and the other electrode comprises (a) Ru, Rh, Pd , Ta, Os, Mo, Mn, Ni, Co, Ir, W, V; (b) alloys, oxides, nitrides, carbides, hydroxides of at least two metals of Ru, Rh, Pd, Ta, Os, Mo, Mn, Ni, Co, Ir, W, and V; (c) doped conductive polymers; (d) An electrode for an electrochemical capacitor, comprising at least one selected from graphite carbon having lithium ions inserted therein, wherein the capacity of one electrode is 10 times or more than that of the other electrode. Mixing a composition comprising an active material and a binder to form a slurry, and using a binder comprising N vinyl acetamide polymer as the binder and including 1 to 20 parts by weight based on 100 parts by weight of the active material; And The method of manufacturing an electrode for an electrochemical capacitor comprising applying a slurry to the current collector to form an electrode. The method of manufacturing an electrode for an electrochemical capacitor according to claim 9, wherein 1 to 10 parts by weight of N vinyl acetamide polymer and 1 to 10 parts by weight of butadiene styrene are used with respect to 100 parts by weight of the active material as a binder.

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