Super capacitor and manufacturing method thereof

Abstract

The invention discloses a super capacitor and a manufacturing method thereof. The manufacturing method comprises the following steps: providing a capacitor packaging body after liquid injection; the capacitor packaging body after liquid injection is pre-charged to preset voltage, and the preset voltage is smaller than or equal to 2.5 V. The capacitor packaging body is provided with a liquid injection opening used for liquid injection. And the liquid injection opening is sealed. According to the invention, low-voltage pre-charging smaller than or equal to 2.5 V is carried out on the battery cell after liquid injection, so that the water content can be removed under a relatively low voltage while electrolyte decomposition does not occur, and the influence on the initial capacity of the supercapacitor is relatively small; and the problems that the manufacturing process cost of the supercapacitor is relatively high and the capacity of the supercapacitor is easily reduced due to an aging process in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage, and in particular to a supercapacitor and a method for manufacturing the same. Background Art

[0002] Supercapacitors have broad application prospects in the fields of aerospace, rail transit, new energy vehicles and the electronics industry due to their ultra-high power density, ultra-fast charging speed, wide operating temperature range, ultra-long cycle life and safety and maintenance-free. At present, the normal production process of supercapacitors is to package the battery cells, reduce the water content to a certain level after baking, and then perform liquid injection, static, aging or capacity testing. Adding an aging process can improve the later life of supercapacitors, but aging is usually performed in a fully charged state (2.7V-3.0V). On the one hand, it will increase the manufacturing cost of the process (relatively long charging time), and on the other hand, aging will increase the decomposition of the electrolyte, resulting in a large loss of capacity. At the same time, the gas generated after aging is not discharged in time, resulting in the risk of swelling and leakage during the long-term service of the battery cells, which brings extremely high safety hazards. Summary of the invention

[0003] The present invention provides a supercapacitor and a manufacturing method thereof, so as to solve the problem in the related art that the manufacturing process cost of the supercapacitor is relatively high and the aging process easily leads to a decrease in its capacity.

[0004] According to one aspect of the present invention, a method for manufacturing a supercapacitor is provided, comprising the following steps: providing a liquid-filled capacitor package; precharging the liquid-filled capacitor package to a preset voltage, wherein the preset voltage is less than or equal to 2.5V, wherein the capacitor package has a liquid injection port, and the liquid injection port is used for liquid injection; and sealing the liquid injection port.

[0005] Furthermore, the preset voltage is 2.0-2.5V.

[0006] Furthermore, in the step of precharging the capacitor package to the preset voltage, the capacitor package precharged to the preset voltage is maintained at a constant voltage for 10 minutes to 6 hours.

[0007] Furthermore, the capacitor package pre-charged to the preset voltage is maintained at a constant voltage for 30 minutes to 4 hours.

[0008] Furthermore, after the step of precharging the capacitor package to the preset voltage and before the step of sealing the liquid injection port, the manufacturing method further includes: evacuating the capacitor package to remove gas in the capacitor package.

[0009] Furthermore, the step of providing the capacitor package after liquid injection includes: providing a plurality of electrode sheets and a diaphragm; laminating and packaging the electrode sheets and the diaphragm to obtain the capacitor package, wherein the plurality of electrode sheets respectively constitute the positive electrode and the negative electrode of the capacitor package; and injecting electrolyte into the capacitor package.

[0010] Furthermore, the step of providing the electrode sheet includes: coating the electrode slurry on the current collector and drying it to obtain an electrode preform; and hot pressing and die-cutting the electrode preform to obtain the electrode sheet.

[0011] Furthermore, the step of preparing the electrode slurry includes: mixing raw materials including activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber with a solvent to obtain the electrode slurry.

[0012] Furthermore, in the step of preparing the electrode slurry, water is used as the solvent, and the activated carbon, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber are mixed and stirred in a ratio of 80%:10%:2%:8% to obtain the electrode slurry.

[0013] According to another aspect of the present invention, a supercapacitor is provided. The supercapacitor is prepared by any of the above-mentioned methods for preparing a supercapacitor.

[0014] By applying the technical solution of the present invention, the battery cell after liquid injection is pre-charged at a low voltage less than or equal to 2.5V, the water content can be removed at a relatively low voltage without decomposing the electrolyte, which has little impact on the initial capacity of the supercapacitor. At the same time, the process time can be shortened and the cost can be saved, thus solving the problem in the prior art that the manufacturing process cost of the supercapacitor is relatively high and the aging process easily leads to a decrease in its capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic flow chart of a method for manufacturing a supercapacitor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] As described in the background technology, the current manufacturing process of supercapacitors has the problem of high cost and the aging process easily leads to a decrease in capacity. In order to solve this problem, the present invention creatively improves the manufacturing process and performs low-voltage pre-charging on the battery cell after liquid injection, thereby reducing the impact on capacity.

[0021] The traditional process aging condition is to charge the battery cell to full power (2.7V or 3.0V) and then perform a constant voltage process. The improved process provided by the present invention is mainly to pre-charge the capacitor at a low voltage after liquid injection (charged to 2.0-2.5V) to remove the residual water content in the electrode through an electrochemical reaction.

[0022] Specifically, Figure 1 FIG. 1 is a flow chart of a method for manufacturing a supercapacitor according to an embodiment of the present invention. Figure 1 As shown, the manufacturing method of the supercapacitor provided by the present invention includes: step 101, providing a capacitor package after liquid injection; step 102, pre-charging the capacitor package after liquid injection to a preset voltage, the preset voltage is less than or equal to 2.5V, wherein the capacitor package has a liquid injection port, and the liquid injection port is used for liquid injection; step 103, sealing the liquid injection port.

[0023] Through the manufacturing method provided by the present invention, the capacitor package is pre-charged to a preset voltage after liquid injection, so that the capacitor can reach a preset voltage state before use to ensure its normal operation, and the packaging process is performed to protect the internal structure of the capacitor, reducing the impact on the initial capacity of the supercapacitor, while shortening the process time and saving costs.

[0024] Furthermore, the preset voltage is 2.0-2.5 V. By limiting the preset voltage, overcharging of the capacitor during the pre-charging process can be effectively avoided, and the water content can be removed at a lower voltage without decomposition of the electrolyte.

[0025] Furthermore, in the step of precharging the capacitor package to a preset voltage, the capacitor package precharged to the preset voltage is kept at a constant voltage for 10 minutes to 6 hours. That is, after the precharging is completed, the capacitor package is placed under a constant voltage for a period of 10 minutes to 6 hours to allow the electrolyte and electrodes inside the capacitor to be fully stable, thereby ensuring that the performance of the capacitor is stable at the preset voltage.

[0026] Furthermore, the capacitor package pre-charged to a preset voltage is kept at a constant voltage for 30 minutes to 4 hours. By keeping the capacitor package pre-charged to a preset voltage at a constant voltage for a period of time, such as 10 minutes to 30 minutes, the voltage and charge distribution inside the capacitor are stabilized, and the various chemical substances inside the capacitor are fully mixed, ensuring that the capacitor can stably output electrical energy when working.

[0027] Furthermore, after the step of precharging the capacitor package to a preset voltage and before the step of sealing the injection port, the manufacturing method further includes the following steps: performing a gas extraction process on the capacitor package to remove the gas in the capacitor package. Specifically, after precharging, the gas inside the capacitor package is extracted using a gas extraction device to form a vacuum state inside the capacitor, thereby effectively removing the gas in the capacitor package, reducing the oxygen content inside the capacitor, and preventing the gas from affecting the performance of the capacitor.

[0028] Furthermore, the step of providing the above-mentioned capacitor package after liquid injection can be specifically achieved by the following steps: providing a plurality of electrode sheets and a diaphragm; laminating and packaging the electrode sheets and the diaphragm to obtain a capacitor package, wherein the plurality of electrode sheets respectively constitute the positive electrode and the negative electrode of the capacitor package; and injecting the electrolyte into the capacitor package.

[0029] Specifically, first, a plurality of electrode sheets and diaphragms are prepared, and the electrode sheets and diaphragms are stacked and packaged and then injected with electrolyte. Through the stacking and packaging processes, a close connection between the electrode sheets and the diaphragms can be ensured to avoid short circuits after leakage, thereby improving the stability and reliability of the capacitor. Injecting electrolyte can increase the capacity of the capacitor, improve its energy storage capacity, and enable it to more effectively store and release energy in electronic devices.

[0030] Furthermore, the step of providing the above-mentioned electrode sheet can be specifically achieved by the following steps: coating the electrode slurry on the current collector and drying it to obtain an electrode preform; and hot pressing and die-cutting the electrode preform to obtain the electrode sheet.

[0031] Specifically, activated carbon and other materials are mixed with conductive agents, binders, etc. into a slurry, which is coated on the current collector. The slurry is formed into an electrode preform by drying, and the electrode preform is placed in a hot press for high temperature and high pressure treatment to make the electrode material more dense and uniform. The hot-pressed electrode preform is die-cut to be cut into electrode sheets that meet the size requirements of the supercapacitor, thereby effectively improving the conductivity, stability and preparation accuracy of the electrode sheets.

[0032] Furthermore, the step of preparing the above-mentioned electrode slurry can be specifically achieved by the following steps: mixing raw materials including activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber with a solvent to obtain electrode slurry.

[0033] Specifically, mixing activated carbon and conductive carbon black can increase the conductivity of the electrode. Adding the thickener sodium carboxymethyl cellulose helps the electrode slurry maintain stable fluidity, making it easier to coat the electrode sheet. Adding the adhesive styrene-butadiene rubber helps the electrode slurry form a uniform film layer on the electrode sheet, increasing the flexibility and stability of the electrode, thereby making the capacitor have a higher energy density and better cycle stability.

[0034] Optionally, the electrode active material may be activated carbon, or activated carbon fiber, capacitor carbon, graphite or other forms of carbon materials or a mixture of several thereof.

[0035] Furthermore, in the step of preparing the electrode slurry, water is used as a solvent, and activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene butadiene rubber are mixed and stirred in a ratio of 80%:10%:2%:8% to obtain an electrode slurry. Mixing the above materials in a specified ratio can increase the flexibility of the electrode slurry, styrene butadiene rubber is thermally decomposed to release gas, forming a microporous structure, increasing the surface area of ​​the electrode sheet, and sodium carboxymethyl cellulose will form a cross-linked structure with activated carbon and conductive carbon black to enhance the mechanical strength and stability of the electrode slurry. Water is added as a solvent in a stirring tank for dilution, stirring and dispersing. The entire stirring and dispersing process is carried out in a vacuum environment. The main purpose of dispersing under vacuum conditions is to eliminate bubbles and avoid affecting the dispersion uniformity of the material, thereby obtaining a graphene supercapacitor slurry.

[0036] As can be seen from the above, in an embodiment of the present invention, a water content removal process with low cost, small initial capacity loss and significantly improved later life is provided. First, the battery cell after liquid injection is pre-charged, wherein the pre-charge voltage is 2.0-2.5V (lower than the full-charge voltage 2.7-3.0V), for example, 2.2V, 2.2V, 2.3V, 2.4V, 2.5V, and then aged at this voltage for 10min-6h, preferably 30min-4h, and the generated gas is discharged by secondary packaging. Through the implementation of the process of the present invention, the water content can be removed at a lower voltage without decomposition of the electrolyte, and the impact on the initial capacity of the supercapacitor is small. At the same time, the two-sealing process after the pre-charge is completed can discharge the gas generated by water decomposition, reducing the risk of swelling and leakage of the supercapacitor in the later stage.

[0037] According to another aspect of the present invention, a supercapacitor is provided. The supercapacitor is prepared by any of the above-mentioned methods for preparing a supercapacitor.

[0038] In order to further illustrate the purpose, effect, and technical solution of the present invention in detail, the method for manufacturing the supercapacitor of the present invention will be described below in combination with specific embodiments and comparative examples.

[0039] Example 1

[0040] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0041] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0042] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0043] 3. Precharge the capacitor package to 2.0V;

[0044] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0045] Example 2

[0046] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0047] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0048] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0049] 3. Precharge the capacitor package to 2.0V and maintain constant voltage at 2.0V for 30 minutes;

[0050] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0051] Example 3

[0052] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0053] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0054] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0055] 3. Precharge the capacitor package to 2.2V and maintain constant voltage at 2.2V for 30 minutes;

[0056] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0057] Example 4

[0058] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0059] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0060] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0061] 3. Precharge the capacitor to 2.5V and maintain constant voltage at 2.5V for 30 minutes;

[0062] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0063] Example 5

[0064] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0065] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0066] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0067] 3. Precharge the capacitor to 2.0V and keep constant voltage at 2.0V for 4h;

[0068] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0069] Example 6

[0070] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0071] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0072] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0073] 3. Precharge the capacitor to 2.2V and keep constant voltage at 2.2V for 4h;

[0074] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0075] Example 7

[0076] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0077] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0078] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0079] 3. Precharge the capacitor to 2.5V and keep constant voltage at 2.5V for 4h;

[0080] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0081] Example 8

[0082] The method for manufacturing a supercapacitor provided in this embodiment comprises the following steps:

[0083] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0084] 2. Use a transfer coater to apply the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection and standing treatment to obtain a capacitor package;

[0085] 3. Precharge the capacitor to 2.0V and keep constant voltage at 2.0V for 1h;

[0086] 4. The capacitor package is evacuated to remove the gas therein, and then sealed.

[0087] Comparative Example 1

[0088] The method for making a supercapacitor provided in this comparative example comprises the following steps:

[0089] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0090] 2. Use a transfer coater to coat the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection, and static treatment;

[0091] 3. Precharge the capacitor to 2.7V and then seal it.

[0092] Comparative Example 2

[0093] The method for making a supercapacitor provided in this comparative example comprises the following steps:

[0094] 1. Using water as solvent, activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber are mixed in a planetary mixer at a ratio of 80%:10%:2%:8% to prepare electrode slurry;

[0095] 2. Use a transfer coater to coat the slurry onto a carbon-coated aluminum foil to form an electrode sheet, and then perform rolling, die-cutting, lamination, packaging, baking, liquid injection, and static treatment;

[0096] 3. Precharge the capacitor to 2.7V, maintain constant voltage at 2.7V for 12 hours, and then seal it.

[0097] The logistics performance of the supercapacitors prepared in Examples 1-8 of the present invention and Comparative Examples 1-2 are shown in Table 1.

[0098] Table 1

[0099]

[0100]

[0101] It can be seen from the experimental data of the above embodiments and comparative examples that by pre-charging the capacitor at a lower voltage and further removing the gas therein before conducting capacity and high-temperature floating charge performance tests, the water content obtained is significantly reduced compared with the initial value, and the water content can be removed at a lower voltage without decomposition of the electrolyte, which has little impact on the initial capacity of the supercapacitor.

[0102] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0103] In the manufacturing method of the supercapacitor provided by the present invention, a capacitor package after liquid injection is provided, and the capacitor package after liquid injection is precharged to a preset voltage, the preset voltage is less than or equal to 2.5V, wherein the capacitor package has a liquid injection port, the liquid injection port is used for liquid injection, and then the liquid injection port is sealed, so that by precharging the battery cell after liquid injection at a low voltage less than or equal to 2.5V, the water content can be removed at a lower voltage without decomposition of the electrolyte, which has little impact on the initial capacity of the supercapacitor, and can shorten the process time and save costs, thereby solving the problem in the prior art that the manufacturing process cost of the supercapacitor is high and the aging process easily leads to a reduction in its capacity.

[0104] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for manufacturing a supercapacitor, characterized in that: The following steps are involved: Providing a capacitor package after liquid injection; Pre-charging the capacitor package after liquid injection to a preset voltage, wherein the preset voltage is less than or equal to 2.5V, wherein the capacitor package has a liquid injection port, and the liquid injection port is used for liquid injection; The liquid injection port is sealed.

2. The method according to claim 1, characterized in that: The preset voltage is 2.0-2.5V.

3. The method according to claim 2, characterized in that: In the step of precharging the capacitor package to the preset voltage, the capacitor package precharged to the preset voltage is maintained at a constant voltage for 10 minutes to 6 hours.

4. The method according to claim 3, characterized in that: The capacitor package pre-charged to the preset voltage is maintained at a constant voltage for 30 minutes to 4 hours.

5. The method according to any one of claims 1 to 4, characterized in that: After the step of precharging the capacitor package to the preset voltage and before the step of sealing the liquid injection port, the manufacturing method further includes: The capacitor package is subjected to a degassing treatment to remove gas in the capacitor package.

6. The method according to any one of claims 1 to 4, characterized in that: The step of providing the capacitor package after liquid injection comprises: Providing a plurality of electrode sheets and diaphragms; Performing lamination and packaging processing on the electrode sheets and the diaphragm to obtain the capacitor package, wherein the plurality of electrode sheets respectively constitute the positive electrode and the negative electrode of the capacitor package; An electrolyte is injected into the capacitor package.

7. The manufacturing method according to claim 6, characterized in that: The step of providing the electrode sheet comprises: Applying the electrode slurry on the current collector and drying it to obtain an electrode preform; The electrode preform is subjected to heat pressing and die cutting to obtain the electrode sheet.

8. The method according to claim 7, characterized in that: The steps of preparing the electrode slurry include: The electrode slurry is obtained by mixing raw materials including activated carbon, conductive carbon black, sodium carboxymethyl cellulose and styrene-butadiene rubber with a solvent.

9. The manufacturing method according to claim 8, characterized in that: In the step of preparing the electrode slurry, water is used as the solvent, and the activated carbon, the conductive carbon black, the sodium carboxymethyl cellulose and the styrene-butadiene rubber are mixed and stirred in a ratio of 80%:10%:2%:8% to obtain the electrode slurry.

10. A supercapacitor, characterized in that: The supercapacitor is prepared by the manufacturing method according to any one of claims 1 to 9.

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