Preparation method of conductive electrolytic paper

Abstract

The invention provides a preparation method of conductive electrolytic paper, which comprises the following steps: uniformly mixing paper pulp and a conductive polymer solution, and then preparing the electrolytic paper, the conductive polymer solution comprises the following components in percentage by mass: 1%-10% of a conductive polymer, 0.1%-5% of a surfactant, 0.1%-10% of a cross-linking agent, 1%-20% of a conductivity improver and the balance of water. According to the preparation method, the appropriate conductive polymer solution and the paper pulp are ingeniously used for mixed papermaking in the papermaking process of the electrolytic paper, the density, strength and toughness of the electrolytic paper are improved, conductivity is achieved on the basis that the physical characteristics of existing electrolytic paper are enhanced, the paper resistance value is reduced, and the service life of the electrolytic paper is prolonged. The problem that the performance of the capacitor is unstable due to the fact that the liquid absorption effect of existing electrolytic paper on the conductive polymer solution is different is effectively solved, and the subsequent preparation process of the solid electrolytic capacitor is simplified.

Description

Technical Field

[0001] The present invention belongs to the technical field of conductive paper materials, and particularly relates to a preparation method of conductive electrolytic paper. Background Art

[0002] Solid aluminum electrolytic capacitors use conductive polymers with high conductivity as electrolytes. Compared with ordinary aluminum electrolytic capacitors, they not only have the characteristics of ordinary electrolytic capacitors, but also have good reliability, long service life, low high-frequency impedance, and resistance to extremely large ripple currents. They can be used in fields such as computers, communications, military, industrial control, and new-generation high-end integrated products of consumer electronic products such as cameras, video recorders, flat-panel TVs, and game consoles, which is conducive to the integration and miniaturization of electronic products.

[0003] At present, the preparation process of solid aluminum electrolytic capacitors generally includes: foil opening - riveting - winding - forming - impregnation - baking - sealing - aging. It can be seen from the process route that the production process of aluminum solid electrolytic capacitors is complex, with cumbersome procedures, many control points, and high equipment requirements, which has been restricting the development of the entire aluminum solid electrolytic capacitor industry. From the process that affects the final performance of the capacitor, the impregnation process is a relatively large influencing factor. The existing preparation process of solid capacitors is to first prepare electrolytic paper, wind it with positive and negative foils to form a capacitor element, and then impregnate it with a conductive polymer solution and assemble it. However, different types of electrolytic papers have different wettabilities and liquid absorption capacities for the conductive polymer solution, resulting in very different liquid absorption effects, different liquid absorption thicknesses and uniformities, so that the performance of the prepared capacitors varies greatly and cannot fully meet the needs of users. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a preparation method of conductive electrolytic paper, which effectively solves the problem of unstable capacitor performance caused by the difference in the liquid absorption effect of electrolytic paper for the conductive polymer solution, and simplifies the subsequent preparation process of solid electrolytic capacitors.

[0005] To achieve the above object, the present invention adopts the following technical solutions.

[0006] In the first aspect of the present invention, a preparation method of conductive electrolytic paper is provided, including the following steps: mixing pulp with a conductive polymer solution evenly, and then preparing it into electrolytic paper; the conductive polymer solution contains the following components in mass percentage: 1% - 10% of conductive polymer, 0.1% - 5% of surfactant, 0.1% - 10% of crosslinking agent, 1% - 20% of conductivity enhancer, and the balance is water.

[0007] In some embodiments, the mass ratio of the conductive polymer solution to the pulp is 1:10 - 1:100.

[0008] In some embodiments, the conductive polymer includes at least one of acetylene and its derivatives, thiophene and its derivatives, aniline and its derivatives, pyrrole and its derivatives, benzodifurandione and its derivatives.

[0009] In some embodiments, the surfactant includes at least one of polyvinylpyrrolidone, polyoxyethylene lauryl ether, polyoxyethylene ether, sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, glycerol monostearate, polysorbate, and polydimethylsiloxane.

[0010] In some embodiments, the crosslinking agent includes at least one of 3-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, and γ-mercaptopropyltriethoxysilane.

[0011] In some embodiments, the conductivity enhancer includes at least one of ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, glycerol, 1,4-butanediol, butanetriol, and dimethyl sulfoxide.

[0012] In some embodiments, the pulp includes at least one of kraft pulp, manila hemp fiber pulp, sisal fiber pulp, softwood fiber pulp, seed hair fiber pulp, bast fiber pulp, and PMA pulp.

[0013] In a second aspect of the present invention, there is provided a conductive electrolytic paper prepared by the method as described above.

[0014] In a third aspect of the present invention, there is provided a solid electrolytic capacitor, which includes the conductive electrolytic paper prepared by the method as described above.

[0015] The present invention provides a method for preparing an electrolytic paper. The inventor ingeniously uses a suitable conductive polymer solution to mix and paper with pulp during the paper-making process of the electrolytic paper, effectively solving the problem of unstable capacitor performance caused by the difference in the liquid absorption effect of the existing electrolytic paper on the conductive polymer solution, and simplifying the subsequent preparation process of the solid electrolytic capacitor. The mixing and papermaking can make the conductive polymer more evenly distributed in the electrolytic paper, improving the density, strength, and toughness of the electrolytic paper, and endowing conductivity on the basis of enhancing the physical properties of the existing electrolytic paper. And the electrolytic paper has a significantly reduced resistivity due to bonding with the conductive polymer. In subsequent applications, it can effectively reduce the equivalent series resistance of capacitor components. In addition, due to the pre-mixing of the conductive polymer solution, when the core is impregnated with the cathode material later, the manufacturing process can be shortened and the process stability can be improved. And, thanks to the chemical bond force between the conductive polymer and the electrolytic paper fibers, the two are more firmly combined, which is beneficial to improving the comprehensive performance of capacitor devices, including high-temperature life, reflow soldering, stability, etc.

[0016] The conductive polymer solution for co-papermaking with pulp in the present invention comprises a conductive polymer, a surfactant, a crosslinking agent, and a conductivity enhancer in appropriate proportions, and the components cooperate with each other and complement each other. Among them, the crosslinking agent can promote the binding force between the conductive polymer and the pulp, and improve the strength of the obtained conductive electrolytic paper; the conductivity enhancer used in combination further improves the conductivity of the conductive polymer solution through secondary doping, thereby improving the conductivity of the electrolytic paper obtained by co-papermaking. Detailed implementation manners

[0017] For the experimental methods without specific conditions in the following examples of the present invention, they are generally carried out under conventional conditions or according to the conditions recommended by the manufacturer. All kinds of commonly used chemical reagents used in the examples are commercially available products.

[0018] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0019] The terms "comprising" and "having" and any variations thereof in the present invention are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or equipment that includes a series of steps is not limited to the listed steps or modules, but may optionally further include steps not listed, or may optionally further include other steps inherent to these processes, methods, products, or equipment.

[0020] The "at least one" mentioned in the present invention refers to one or more than one.

[0021] The following is an illustration with specific examples.

[0022] Example 1

[0023] This example is used to illustrate the preparation method of the conductive electrolytic paper for solid electrolytic capacitors disclosed in the present invention, and the solid capacitor prepared by using this electrolytic paper.

[0024] During the process of papermaking the electrolytic paper, the conductive polymer solution is used for papermaking with kraft pulp. The conductive polymer solution comprises: 3% polyacetylene conductive polymer, 91.6% water as the medium, 0.1% polyvinylpyrrolidone, 0.3% 3-aminopropyltriethoxysilane, and 5% ethylene glycol. The mixing ratio of the conductive polymer solution and kraft pulp is 1:10. After the two are mixed evenly, they are preliminarily dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make the finished electrolytic paper.

[0025] The sheet resistance value of the electrolytic paper was tested using PEDOT:PSS dispersion (a commercially available product from Shenzhen Capchem Technology Co., Ltd., model ped-201). The specific test method was as follows: Take a 5-cm long electrolytic paper, use a dropper to suck 0.5 g of the dispersion, evenly coat it on the electrolytic paper, put the coated electrolytic paper into an oven at 150 °C and bake for 20 min and then take it out. Apply silver paste electrodes at intervals of 1 cm. After drying, use a multimeter to measure the resistance value between the two silver paste electrodes (with a 1-cm spacing), which is the sheet resistance value. The test results are shown in Table 1.

[0026] Meanwhile, the electrolytic paper was wound with a positive foil and a negative foil to form a capacitor element. After formation, cleaning, and drying, it was impregnated with PEDOT:PSS dispersion under negative pressure for 20 min and then dried. The above steps were repeated 3 times, and then it was sealed and assembled into a solid-state capacitor. An automatic electronic component analyzer was used to test the capacitance, loss value, and equivalent series resistance of the capacitor. The test method referred to the measurement of conventional solid electrolytic capacitors and will not be elaborated here. The test results are shown in Table 1.

[0027] Example 2

[0028] This example is used to illustrate the preparation method of the conductive electrolytic paper for the solid electrolytic capacitor disclosed in the present invention, and the solid-state capacitor prepared using this electrolytic paper.

[0029] During the process of making the electrolytic paper by papermaking, a conductive polymer solution was used to make paper with Manila hemp fiber pulp. The conductive polymer solution included: 2.4% polyaniline conductive polymer, 87.2% water as the medium, 0.3% polyethylene oxide ether, 0.1% γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 10% glycerol. The mixing ratio of the conductive polymer solution and Manila hemp fiber pulp was 1:40. After the two were mixed evenly, they were preliminarily dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make the finished electrolytic paper.

[0030] The sheet resistance value of this electrolytic paper was tested using PEDOT:PSS dispersion. The test method was the same as the sheet resistance test method in Example 1. The test results are shown in Table 1.

[0031] Meanwhile, the electrolytic paper was wound with a positive foil and a negative foil to form a capacitor element. After formation, cleaning, and drying, it was impregnated with PEDOT:PSS dispersion under negative pressure for 20 min and then dried. The above steps were repeated 3 times, and then it was sealed and assembled into a solid-state capacitor. An automatic electronic component analyzer was used to test the capacitance, loss value, and equivalent series resistance of the capacitor. The test method was the same as that in Example 1. The test results are shown in Table 1.

[0032] Example 3

[0033] This embodiment is used to illustrate the preparation method of the conductive electrolytic paper for solid electrolytic capacitors disclosed in the present invention, and the solid capacitor prepared by using this electrolytic paper.

[0034] During the process of making electrolytic paper, a conductive polymer solution is used to make paper with a mixed pulp of Manila hemp fiber pulp and sisal fiber pulp (the mass ratio of Manila hemp fiber pulp to sisal fiber pulp is 2:1). The conductive polymer solution includes: 3.4% poly(3,4-ethylenedioxythiophene) conductive polymer, 75.6% water as the medium, 0.5% sodium dodecyl sulfate, 0.5% 3-methacryloxypropyltrimethoxysilane, and 20% diethylene glycol. The ratio of the conductive polymer solution to the mixed pulp of Manila hemp fiber pulp and sisal fiber pulp is 1:50. After the two are mixed evenly, they are initially dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make the finished electrolytic paper.

[0035] The sheet resistance value of this electrolytic paper is tested using PEDOT:PSS dispersion liquid, and the testing method is the same as the sheet resistance testing method in Example 1. The test results are shown in Table 1.

[0036] At the same time, using this electrolytic paper, a capacitor element is wound with a positive foil and a negative foil. After formation, cleaning, and drying, it is impregnated with PEDOT:PSS dispersion liquid under negative pressure for 20 minutes and then dried. The above steps are repeated 3 times, and then it is sealed and assembled into a solid capacitor. An automatic electronic component analyzer is used to test the capacitance, loss value, and equivalent series resistance of the capacitor. The testing method is the same as that in Example 1 and will not be elaborated here. The test results are shown in Table 1.

[0037] Example 4

[0038] This embodiment is used to illustrate the preparation method of the conductive electrolytic paper for solid electrolytic capacitors disclosed in the present invention, and the solid capacitor prepared by using this electrolytic paper.

[0039] During the process of making electrolytic paper, a conductive polymer solution is used to make paper with PMA pulp. The conductive polymer solution includes: 2.1% polypyrrole conductive polymer, 92.9% water as the medium, 1% polyoxyethylene laurate, 3% γ-aminopropyltrimethoxysilane, and 1% butanetriol. The mixing ratio of the conductive polymer solution to PMA pulp is 1:80. After the two are mixed evenly, they are initially dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make the finished electrolytic paper.

[0040] The sheet resistance value of this electrolytic paper is tested using PEDOT:PSS dispersion liquid, and the testing method is the same as the sheet resistance testing method in Example 1. The test results are shown in Table 1.

[0041] Meanwhile, the electrolytic paper is wound together with the positive foil and the negative foil to form a capacitor element. After formation, cleaning, and drying, it is impregnated with a PEDOT:PSS dispersion liquid under negative pressure for 20 minutes and then dried. The above steps are repeated 3 times, and then it is sealed and assembled into a solid-state capacitor. An automatic electronic component analyzer is used to test the capacitance, loss value, and equivalent series resistance of the capacitor. The testing method is the same as that in Example 1 and will not be elaborated here. The test results are shown in Table 1.

[0042] Example 5

[0043] This example is used to illustrate the preparation method of the conductive electrolytic paper for the solid-state electrolytic capacitor disclosed in the present invention, as well as the solid-state capacitor prepared using this electrolytic paper.

[0044] During the process of papermaking the electrolytic paper, papermaking is carried out using a conductive polymer solution and a mixed pulp of softwood fiber pulp and seed hair fiber pulp (the mass ratio of softwood fiber pulp to seed hair fiber pulp is 1:1). The conductive polymer solution includes: 5% polybenzodifuran dione conductive polymer, 68% water as the medium, 5% polyethylene oxide ether, 10% γ-mercaptopropyltriethoxysilane, and 12% dimethyl sulfoxide. The ratio of the conductive polymer solution to the mixed pulp of softwood fiber pulp and seed hair fiber pulp is 1:20. After the two are mixed evenly, preliminary dehydration is carried out at the wire section of the paper machine to form a wet paper sheet, and then it is dehydrated by pressing and dried to make the finished electrolytic paper.

[0045] The sheet resistance value of this electrolytic paper is tested using a PEDOT:PSS dispersion liquid. The testing method is the same as the sheet resistance testing method in Example 1. The test results are shown in Table 1.

[0046] Meanwhile, the electrolytic paper is wound together with the positive foil and the negative foil to form a capacitor element. After formation, cleaning, and drying, it is impregnated with a PEDOT:PSS dispersion liquid under negative pressure for 20 minutes and then dried. The above steps are repeated 3 times, and then it is sealed and assembled into a solid-state capacitor. An automatic electronic component analyzer is used to test the capacitance, loss value, and equivalent series resistance of the capacitor. The testing method is the same as that in Example 1 and will not be elaborated here. The test results are shown in Table 1.

[0047] Example 6

[0048] This example is used to illustrate the preparation method of the conductive electrolytic paper for the solid-state electrolytic capacitor disclosed in the present invention, as well as the solid-state capacitor prepared using this electrolytic paper.

[0049] During the electrolytic paper making process, a conductive polymer solution is used to make paper with bast fiber pulp. The conductive polymer solution contains: 3% polyaniline conductive polymer, 85.5% water as the medium, 1.5% polydimethylsiloxane, 2% 3-aminopropyltriethoxysilane, and 8% 1,2-propanediol. The mixing ratio of the conductive polymer solution to the bast fiber pulp is 1:100. After the two are mixed evenly, they are preliminarily dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make the finished electrolytic paper.

[0050] The sheet resistance value of the electrolytic paper is tested using PEDOT:PSS dispersion, and the testing method is the same as the sheet resistance testing method in Example 1. The test results are shown in Table 1.

[0051] Meanwhile, the electrolytic paper is wound together with the positive foil and negative foil to form a capacitor element. After formation, cleaning, and drying, it is impregnated with PEDOT:PSS dispersion for 20 minutes under negative pressure conditions and then dried. The above steps are repeated 3 times, and then it is sealed and assembled into a solid-state capacitor. An automatic electronic component analyzer is used to test the capacitance, loss value, and equivalent series resistance of the capacitor, and the testing method is the same as that in Example 1. The test results are shown in Table 1.

[0052] Comparative Example 1

[0053] This comparative example is used to compare and illustrate the preparation method of the conductive electrolytic paper for solid electrolytic capacitors disclosed in the present invention, and the solid-state capacitor prepared using this electrolytic paper.

[0054] The mixed pulp of Manila hemp fiber pulp and sisal fiber pulp (the mass ratio of Manila hemp fiber pulp to sisal fiber pulp is 2:1) is made into the finished electrolytic paper according to the same traditional electrolytic paper preparation process as in Example 3: The mixed pulp of Manila hemp fiber pulp and sisal fiber pulp is preliminarily dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make the finished electrolytic paper.

[0055] The sheet resistance value of the electrolytic paper is tested using PEDOT:PSS dispersion, and the testing method is the same as the sheet resistance testing method in Example 1. The test results are shown in Table 1.

[0056] Meanwhile, the electrolytic paper is wound together with the positive foil and negative foil to form a capacitor element. After formation, cleaning, and drying, it is impregnated with PEDOT:PSS dispersion for 20 minutes under negative pressure conditions and then dried. The above steps are repeated 3 times, and then it is sealed and assembled into a solid-state capacitor. An automatic electronic component analyzer is used to test the capacitance, loss value, and equivalent series resistance of the capacitor, and the testing method is the same as that in Example 1, which will not be elaborated here. The test results are shown in Table 1.

[0057] Comparative Example 2

[0058] This comparative example is used to comparatively illustrate the preparation method of the conductive electrolytic paper for solid electrolytic capacitors disclosed by the present invention, and the solid capacitors prepared using this electrolytic paper.

[0059] The mixed pulp of Manila hemp fiber pulp and sisal fiber pulp is made into a finished electrolytic paper according to the same traditional electrolytic paper preparation process as in Example 3: The mixed pulp of Manila hemp fiber pulp and sisal fiber pulp is preliminarily dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make a finished electrolytic paper. The electrolytic paper is impregnated in a conductive polymer solution, and the conductive polymer solution includes: 3.4% poly(3,4-ethylenedioxythiophene) conductive polymer, 75.6% water as the medium, 0.5% sodium dodecyl sulfate, 0.5% 3-methacryloxypropyltrimethoxysilane, and 20% diethylene glycol. The electrolytic paper is taken out and dried.

[0060] Using this electrolytic paper, a capacitor element is wound with a positive foil and a negative foil. After formation, cleaning, and drying, it is impregnated with a PEDOT:PSS dispersion liquid under negative pressure for 20 minutes and dried. The above steps are repeated 3 times, and then it is sealed and assembled into a solid capacitor. An automatic electronic component analyzer is used to test the capacitance, loss value, and equivalent series resistance of the capacitor. The test method is the same as in Example 1 and will not be elaborated here. The test results are shown in Table 1.

[0061] Comparative Example 3

[0062] This example is used to illustrate the preparation method of the conductive electrolytic paper for solid electrolytic capacitors disclosed by the present invention, and the solid capacitors prepared using this electrolytic paper.

[0063] During the process of papermaking the electrolytic paper, papermaking is carried out using a conductive polymer solution and a mixed pulp of Manila hemp fiber pulp and sisal fiber pulp (mass ratio 2:1). The conductive polymer solution includes: 3.4% poly(3,4-ethylenedioxythiophene) conductive polymer, 76.1% water as the medium, 0.5% sodium dodecyl sulfate, and 20% diethylene glycol. The ratio of the conductive polymer solution to the mixed pulp of Manila hemp fiber pulp and sisal fiber pulp is 1:50. After mixing evenly, it is preliminarily dehydrated at the wire section of the paper machine to form a wet paper sheet, and then dehydrated by pressing and dried to make a finished electrolytic paper.

[0064] The sheet resistance value of this electrolytic paper is tested using a PEDOT:PSS dispersion liquid. The test method is the same as the sheet resistance test method in Example 1. The test results are shown in Table 1.

[0065] Meanwhile, the electrolytic paper is wound with the positive foil and the negative foil to form a capacitor element. After formation, cleaning, and drying, it is impregnated with the PEDOT:PSS dispersion liquid under negative pressure for 20 minutes and then dried. The above steps are repeated 3 times, and then it is sealed and assembled into a solid-state capacitor. An automatic electronic component analyzer is used to test the capacitance, loss value, and equivalent series resistance of the capacitor. The test method is the same as that in Example 1 and will not be elaborated here. The test results are shown in Table 1.

[0066] Table 1 Test Results of Various Performance and Paper Resistance of Solid-State Capacitors (16V 470μF 5.5*11 Core Package)

[0067] Example Paper Resistance / Ω Capacitance (μF) Loss Value (%) ESR (mΩ) Example 1 31.2 452 2.48 7.1 Example 2 25.4 452 2.43 6.7 Example 3 24.6 455 2.37 6.4 Example 4 30.4 453 2.43 7.0 Example 5 20.5 455 2.40 5.6 Example 6 26.8 452 2.46 6.8 Comparative Example 1 49.2 450 2.94 8.7 Comparative Example 2 42.1 451 2.88 8.1 Comparative Example 3 36.5 452 2.79 7.9

[0068] According to the test results in Table 1, it can be seen that the resistance values of the electrolytic paper prepared by the method of the present invention (Examples 1 to 6) are all smaller than those of the comparative examples, indicating that the electrolytic paper prepared by the method of the present invention has better conductivity and can obtain lower paper resistance values.

[0069] Comparing the electrical performance results of the capacitors in the above examples and comparative examples, it can be seen that the ESR values of the capacitors of the present invention are all relatively low, indicating that the electrolytic paper prepared by the method of the present invention also has good conductivity in capacitor devices; at the same time, because the conductive polymer material is mixed into the electrolytic paper, when impregnating the dispersion liquid in the later stage, the dispersion liquid is more likely to combine with the electrolytic paper and more firmly, and more conductive polymer solution can adhere to the electrolytic paper, thereby greatly improving the impregnation effect and also being beneficial to the improvement of the ESR performance of the capacitor.

[0070] Compared with Example 3, when preparing the electrolytic paper in Comparative Example 1, the conductive polymer solution is not used for mixed beating with the pulp, resulting in an increase in the paper resistance value and deterioration of the related performance of the capacitor device.

[0071] Compared with Example 3, in Comparative Example 2, the electrolytic paper is first prepared and then impregnated with the conductive polymer solution, resulting in uneven distribution of the conductive polymer inside the electrolytic paper after impregnation, affecting the normal transmission of electrons, making its transmission path longer, and the conductivity worse, so the paper resistance value and the performance of the capacitor device deteriorate.

[0072] Compared with Example 3, in Comparative Example 3, no cross-linking agent is added to the conductive polymer solution. After the electrolytic paper prepared by mixed beating is wound with the positive and negative foils to form an element and impregnated with the PEDOT:PSS dispersion liquid to prepare a solid-state capacitor, the conductive polymer is easily detached and soaked by the PEDOT:PSS dispersion liquid due to the weakened bonding ability between the conductive polymer and the paper, making the conductivity of the electrolytic paper worse, resulting in deterioration of the paper resistance and the performance of the capacitor device.

[0073] In summary, in the papermaking process of the electrolytic paper of the present invention, a suitable conductive polymer solution is used for co-papermaking with the pulp, which improves the density, strength and toughness of the electrolytic paper, endows conductivity on the basis of enhancing the physical properties of the existing electrolytic paper, reduces the paper resistance value, and improves the relevant electrical properties of the capacitor.

[0074] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0075] The above-described embodiments merely represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention shall be subject to the appended claims.

Claims

1. A method for preparing a conductive electrolytic paper, characterized in that, It includes the following steps: uniformly mixing pulp with a conductive polymer solution, and then preparing it into electrolytic paper; the conductive polymer solution contains the following components in mass percentage: 1% - 10% of conductive polymer, 0.1% - 5% of surfactant, 0.1% - 10% of crosslinking agent, 1% - 20% of conductivity enhancer, and the balance is water.

2. The preparation method according to claim 1, wherein The mass ratio of the conductive polymer solution to pulp is 1:10 - 1:

100.

3. The preparation method according to claim 1, characterized in that, The conductive polymer includes at least one of polyacetylene and its derivatives, polythiophene and its derivatives, polyaniline and its derivatives, polypyrrole and its derivatives, polybenzodifurandione and its derivatives.

4. The preparation method according to claim 1, characterized in that, The surfactant includes at least one of polyvinylpyrrolidone, polyoxyethylene laurate ether, polyoxyethylene ether, sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, glycerol monostearate, polysorbate, and polydimethylsiloxane.

5. The preparation method according to claim 1, characterized in that, The crosslinking agent includes at least one of 3-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, g-aminopropyltrimethoxysilane, and γ-mercaptopropyltriethoxysilane.

6. The preparation method according to claim 1, characterized in that, The conductivity enhancer includes at least one of ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, glycerol, 1,4-butanediol, butanetriol, and dimethyl sulfoxide.

7. The preparation method according to claim 1, characterized in that, The pulp includes at least one of kraft pulp, manila hemp fiber pulp, sisal fiber pulp, softwood fiber pulp, seed hair fiber pulp, bast fiber pulp, and PMA pulp.

8. The conductive electrolytic paper obtained by the method according to any one of claims 1 - 7.

9. A solid electrolytic capacitor, characterized in that, The solid electrolytic capacitor contains the conductive electrolytic paper obtained by the method according to any one of claims 1 - 7.