Capacitor core, capacitor and manufacturing method, electronic product

Abstract

The application provides a capacitor core, a capacitor and a manufacturing method and an electronic product, and relates to the capacitor field. The capacitor core manufacturing method comprises the following steps: obtaining an anode body; generating a first cathode layer on the anode body to obtain a first intermediate piece; the first cathode layer is a poly (benzodifuran dione) layer; generating a second cathode layer on the first cathode layer of the first intermediate piece to obtain a second intermediate piece; the second cathode layer is a poly 3,4-ethylene dioxythiophene film layer; and manufacturing a capacitor core based on the second intermediate piece. The method helps to improve the performance of the capacitor core and the capacitor manufactured by the capacitor core.

Description

Technical Field

[0001] This application relates to the field of capacitors, and more specifically, provides a capacitor core, a capacitor and a manufacturing method thereof, and an electronic product. Background Technology

[0002] In electrolytic capacitors, the performance of the capacitor can be improved by optimizing the cathode layer material of the capacitor core.

[0003] For example, in some electrolytic capacitors, n-type conductive polymer PBFDO (poly(benzodifurandione)) is used as the cathode layer material of the capacitor core. n-type conductive polymer poly(benzodifurandione) is a new type of material. When forming the cathode layer of the capacitor core, it has the ability to be non-corrosive to the anode, highly resistant to moisture, highly thermally stable, highly conductive and maintain conductivity for a long time. It can reduce the ESR (equivalent series resistance) of the capacitor and improve the stability of the capacitor.

[0004] However, because n-type conductive polymer poly(benzodifurandione) is a new material, the technology of using it as the outer layer (i.e., cathode layer) of capacitor core is not mature enough, and there are still some defects in using n-type conductive polymer poly(benzodifurandione) as cathode layer.

[0005] On the one hand, this material is difficult to densely coat the capacitor core, increasing the risk of direct contact between the graphite layer, silver layer and anode in the capacitor, thus reducing the reliability and voltage withstand capability of the capacitor. On the other hand, the n-type conductive polymer poly(benzodifurandione) has poor resistance to external stress and is prone to cracking, which will reduce the yield of the capacitor, increase leakage current and reduce reliability. Summary of the Invention

[0006] In view of this, the present application aims to provide a capacitor core, an electrolytic capacitor, and a manufacturing method to improve the capacitor core and enhance the performance of the electrolytic capacitor.

[0007] In a first aspect, embodiments of this application provide a method for manufacturing a capacitor core, comprising: obtaining an anode body; forming a first cathode layer on the anode body to obtain a first intermediate; the first cathode layer being a poly(benzodifuran dione) layer; forming a second cathode layer on the first cathode layer of the first intermediate to obtain a second intermediate; the second cathode layer being a poly(3,4-ethylenedioxythiophene) thin film layer; and manufacturing a capacitor core based on the second intermediate.

[0008] In this embodiment, the cathode layer of the capacitor core comprises two layers: a first cathode layer and a second cathode layer. The first cathode layer is the inner layer, and the second cathode layer is the outer layer. The inner layer is a poly(benzodifurandione) layer. Poly(benzodifurandione) possesses high conductivity and long-term conductivity retention, effectively improving the ESR performance of the capacitor core and the capacitor. Furthermore, poly(benzodifurandione) exhibits high thermal stability and a high thermal decomposition temperature, enabling its use at high temperatures and contributing to extended service life. Poly(benzodifurandione) is moisture-resistant and does not deteriorate under high temperature and high humidity conditions. Moreover, poly(benzodifurandione) is an N-type conductive polymer material. Compared to PEDOT:PSS (poly3,4-ethylenedioxythiophene), poly(benzodifurandione) does not corrode the anode material, thus avoiding damage to the dielectric layer on the anode body, thereby contributing to increased rated voltage of the capacitor. Therefore, using poly(benzodifurandione) as the first cathode layer effectively improves the performance of the capacitor core. To address the inherent defects of poly(benzodifurandione), namely its poor resistance to external stress and poor encapsulation, in the embodiments of this application, a second cathode layer is formed on top of the first cathode layer to encapsulate and protect the poly(benzodifurandione) layer. The second cathode layer is a modified poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid (PEDOT:PSS) film layer. The film formed by modified PEDOT:PSS possesses high elasticity, high mechanical strength, and high thermal stability, enabling it to form a complete conductive film encapsulating the capacitor anode, allowing it to withstand stress during processing to prevent damage to the dielectric layer, thereby improving capacitor manufacturing yield and further enhancing the capacitor's withstand voltage. Simultaneously, to avoid the moisture absorption and peeling defects inherent in PEDOT:PSS, a poly(benzodifurandione) layer is used in the inner layer to address these defects. PEDOT:PSS, an aqueous dispersion of PEDOT, has the property of corroding the anode. Furthermore, poly(benzodifurandione) exhibits superior conductivity. Therefore, compared to PEDOT, using a poly(benzodifurandione) layer as the inner layer can help improve capacitance extraction and conductivity, thereby enhancing the overall conductivity of the cathode layer. Thus, in this embodiment, a poly(benzodifurandione) layer is used as the inner layer of the cathode layer on the anode, and a modified PEDOT:PSS thin film layer is used as the outer layer of the cathode layer. The advantages and disadvantages of the two cathode layers complement each other, effectively improving the performance of the capacitor core and the capacitors made from it, as well as increasing the yield rate in manufacturing.

[0009] In one embodiment, forming a second cathode layer on the first cathode layer of the first intermediate includes: forming a bonding layer on the surface of the first cathode layer; and forming the second cathode layer on the bonding layer such that the bonding layer chemically bonds the first cathode layer and the second cathode layer.

[0010] In this embodiment, the first cathode layer and the second cathode layer are made of two different materials, and the bonding between them is less stable than that of a cathode layer made of a single material. Therefore, this application also forms a connecting layer between the first cathode layer and the second cathode layer. This connecting layer can chemically bond the first cathode layer and the second cathode layer to improve the connection strength between them, reduce the possibility of peeling off, and minimize the impact of the first cathode layer and the second cathode layer on the capacitor core and the performance of the capacitor made from it.

[0011] In one embodiment, forming a bonding layer on the surface of the first cathode layer includes: coating the surface of the first cathode layer with a bonding layer solution based on a preset coating process to form the bonding layer; the bonding layer solution includes silane-based substances and / or polyhydroxy substances.

[0012] There may be defects in the bonding between the first cathode layer and the second cathode layer, which may lead to water absorption and peeling. In this embodiment, silane and polyhydroxy substances can form chemical bonds between different materials and enhance the interfacial interaction. The first cathode layer and the second cathode layer are two different materials. The bonding layer formed by the silane substance can effectively improve the bonding strength between the first cathode layer and the second cathode layer. At the same time, it can also alleviate and reduce the occurrence of water absorption and peeling of the second cathode layer, thereby improving the performance and reliability of the capacitor core and the capacitor made therefrom.

[0013] In one embodiment, the silane substance includes one or more of the following: γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0014] In one embodiment, generating a second cathode layer on top of the first cathode layer of the first intermediate includes: obtaining a prepolymerized modified solution of poly(3,4-ethylenedioxythiophene); the prepolymerized modified solution includes a first modified solution, a second modified solution, and a third modified solution; the first modified solution, the second modified solution, and the third modified solution all include an aqueous dispersion of 3,4-ethylenedioxythiophene, and the first modified solution includes a conductive reinforcing material, the second modified solution includes a bonding reinforcing material, and the third modified solution includes a strength reinforcing material; performing a first preset number of impregnations with the first modified solution and drying; performing a second preset number of impregnations with the second modified solution and drying; and performing a third preset number of impregnations with the second modified solution and drying to obtain the second intermediate.

[0015] In this embodiment, a modified poly(3,4-ethylenedioxythiophene) solution is used to improve the overall performance of the second cathode layer. First, a first modified solution is used to impregnate and form the interior of the second cathode layer, which is electrically connected to the first cathode layer. The first modified material includes a conductive reinforcing material and low-particle-size PEDOT:PSS colloidal particles, which helps to increase the capacitance output and thus the capacitance of the capacitor. Next, a second modified solution is used to impregnate and form the middle portion of the second cathode layer. The second modified solution includes a bonding reinforcing material, which helps to improve the connection strength between the interior and exterior of the second cathode layer, thus improving the voltage withstand capability of the capacitor. Finally, a third modified solution is used to form the outermost layer of the second cathode layer. The third modified solution includes a strength reinforcing material, which increases the adhesion of the third modified solution to the anode core and the mechanical strength of the formed film, thereby improving the coating and protection capabilities of the polymer in the second cathode layer for the aluminum anode core, resulting in a capacitor with higher voltage withstand capability.

[0016] In one embodiment, the step of generating a first cathode layer on the anode body to obtain a first intermediate includes: obtaining a pretreatment solution, an oxidant solution, and a polymer monomer solution; impregnating the anode body with the pretreatment solution and drying it; impregnating the anode body with the oxidant solution and drying it; repeating the following first process a fourth preset number of times: impregnating the anode body with the polymer monomer solution and drying it; impregnating the anode body with the oxidant solution and drying it; wherein the pretreatment solution and the polymer monomer solution include benzodifurandione, and the concentration of benzodifurandione in the pretreatment solution is less than the concentration of benzodifurandione in the polymer monomer solution; the oxidant solution is used to react with the benzodifurandione to generate the poly(benzodifurandione).

[0017] In this embodiment, the monomer of benzodifurandione reacts with an oxidant to generate a polymer of benzodifurandione, namely a poly(benzodifurandione) layer. When generating the poly(benzodifurandione) layer, it is not directly generated using a polymer monomer solution containing benzodifurandione, but rather pretreated with a pretreatment solution. The concentration of benzodifurandione in the pretreatment solution is lower than that in the polymer monomer solution; that is, a lower concentration solution is used for pretreatment. This method is to reduce the initial reaction rate, which avoids the polymer growing too quickly and clogging the pores of the anode body, resulting in a loss of capacitance. Therefore, this pretreatment helps to improve the capacitance extraction rate of the capacitor core and improve the performance of the capacitor made from the capacitor core.

[0018] In one embodiment, the pretreatment solution further includes silanes and / or polyhydroxy substances, wherein the silanes include one or more of the following: γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0019] In this embodiment, the first cathode layer and the anode body are made of different materials. Based on this, silane-based substances are added to the pretreatment solution to enhance the connection strength between the first cathode layer and the anode body, reduce the possibility of peeling, and improve the resistance of the capacitor core and the capacitor made from it to external environmental influences.

[0020] Secondly, embodiments of this application provide a capacitor manufacturing method, comprising: manufacturing a capacitor core by the manufacturing method as described in any one of the first aspects; and encapsulating the capacitor core to obtain an electrolytic capacitor.

[0021] Thirdly, embodiments of this application provide a capacitor core, comprising: an anode body, a first cathode layer, a second cathode layer, and a conductive layer; the first cathode layer covers the surface of the anode body; the first cathode layer is a poly(benzodifuran dione) layer; the second cathode layer is on top of the first cathode layer; the second cathode layer is a poly(3,4-ethylenedioxythiophene) thin film layer; and the conductive layer covers the second cathode layer.

[0022] In one embodiment, the capacitor core further includes a connecting layer; the connecting layer is located between the first cathode layer and the second cathode layer, and is used to chemically bond the first cathode layer and the second cathode layer.

[0023] Fourthly, embodiments of this application provide an electrolytic capacitor, including the capacitor core and encapsulation body described in the third aspect; the capacitor core is located within the encapsulation body.

[0024] Fifthly, embodiments of this application provide an electronic product that includes an electrolytic capacitor as described in the fourth aspect. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1This is a schematic diagram of an existing chip capacitor core; Figure 2 A flowchart illustrating a method for manufacturing a capacitor core according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a capacitor core provided in an embodiment of this application; Figure 4 For the existing Figure 4 A schematic diagram of a poly(benzodifuran dione) layer; Figure 5 This is a schematic diagram of a poly(3,4-ethylenedioxythiophene) thin film layer provided in an embodiment of this application.

[0027] Icons: Anode 11; Insulating layer 12; Cathode layer 13; Graphite layer 14; Silver layer 15; First cathode layer 31; Second cathode layer 32; Connecting layer 33. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] First, for ease of understanding, the structure of an electrolytic capacitor will be explained here. An electrolytic capacitor consists of a capacitor core and a package. The electrolytic capacitor includes one or more capacitor cores, which provide the capacitance of the electrolytic capacitor, and the package is used to encapsulate and protect the capacitor core.

[0030] The capacitor core includes an anode, a cathode, an insulating layer between the anode and cathode, and a conductive layer on the outer surface of the cathode. The anode can be a metal such as aluminum or tantalum, and the insulating layer is an oxide of the anode material, such as aluminum oxide or tantalum oxide. The insulating layer, also called the dielectric layer, is used to isolate the anode material and the cathode layer, allowing capacitance to form between them.

[0031] The cathode is coated on an insulating layer and is formed from an electrolyte. Various materials can be used; please refer to existing technologies for details, which will not be elaborated upon here. A conductive layer is used to coat the cathode. The conductive layer may include a graphite layer and a silver layer.

[0032] Please see Figure 1 , Figure 1This is a schematic diagram of a conventional sheet capacitor core. Taking this sheet capacitor core as an example, from the bottom to the outside, the layers are: anode 11, insulating layer 12, cathode layer 13, graphite layer 14, and silver layer 15. The cathode layer 13 covers a portion of the anode 11, so that the uncovered anode portion serves as the positive electrode of the capacitor, and the cathode portion is led out through the graphite layer 14 and the silver layer 15 to serve as the cathode of the capacitor. The above is merely an example; for specific details, please refer to the structure of existing electrolytic capacitors.

[0033] Next, the capacitor core, capacitor, and manufacturing method provided in the embodiments of this application will be described in detail. It should be noted that the manufacturing method provided in this application is applicable to the manufacture of different types of capacitors, including but not limited to capacitors with sheet, block, wound, and columnar structures.

[0034] Please see Figure 2 , Figure 2 This is a flowchart illustrating a method for manufacturing a capacitor core according to an embodiment of this application. The method includes: S210, Obtain the anode body.

[0035] In the embodiments of this application, the anode body can be the anode of various types of capacitors, such as the sheet anode of a sheet capacitor, the anode block of a block capacitor, etc., and there is no limitation herein.

[0036] In the embodiments of this application, the size of the anode body is matched with the size requirements of the capacitor core of the capacitor to be manufactured, and no limitation is imposed here.

[0037] In the embodiments of this application, the anode body can be prepared using existing technologies, such as cutting and die-casting anodes and then performing corresponding physicochemical surface treatments. No limitations are imposed. In the embodiments of this application, the anode body can be pre-prepared and directly obtainable and usable.

[0038] In the embodiments of this application, the material used for the anode body is not limited; for example, it can be a single metal material such as aluminum or tantalum. Specific examples can be found in existing capacitor anode materials.

[0039] In the embodiments of this application, an oxide film is formed on the surface of the anode body. For example, the surface of the aluminum core is aluminum oxide, and the surface of the tantalum core is tantalum pentoxide. This oxide film can also be called an oxide layer, an insulating layer, or a dielectric layer. This oxide film is used to protect the internal anode material and to isolate the external cathode to form a capacitor. That is, the anode body obtained in this application includes not only the internal anode but also its external dielectric layer.

[0040] The shape, size, type, material, and manufacturing method of the anode body can be referenced from the prior art. The anode body can be any structure known to those skilled in the art. The above are merely examples and are not intended to be limiting.

[0041] S220, a first cathode layer is formed on the anode body to obtain the first intermediate.

[0042] In this embodiment, the first cathode layer is a poly(benzodifurandione) layer.

[0043] Poly(benzodifurandione) is an N-type conductive polymer material that does not corrode the dielectric layer on the anode surface. This effectively reduces the reliability degradation caused by dielectric corrosion, minimizes abnormally high leakage current due to insufficient insulation, and prevents capacitor breakdown, thus improving capacitor reliability. Furthermore, compared to some methods that use acidic solutions to synthesize poly(benzodifurandione), such as the synthesis of PEDOT (poly(3,4-ethylenedioxythiophene)), the synthesis of poly(benzodifurandione) does not require acidic solutions and does not damage the dielectric layer. This avoids situations where the capacitor's rated voltage decreases due to damage to the dielectric layer. For example, in a capacitor with identical requirements except for the cathode layer material, the rated voltage using PEDOT typically does not exceed 16V, while using poly(benzodifurandione) as the cathode layer can result in a rated voltage exceeding 25V.

[0044] Poly(benzodifurandione) exhibits high electrical conductivity; for example, its conductivity can exceed 2000 S / cm, higher than materials such as poly(3,4-ethylenedioxythiophene), and even surpassing the conductivity levels of other commonly used materials. Using poly(benzodifurandione) as the first cathode layer of the anode can help improve the ESR performance of the capacitor core and the capacitors made from it. Simultaneously, the higher conductivity also allows the cathode layer to draw out a larger capacitance, thereby increasing the capacitance of the capacitor core and the capacitor itself.

[0045] Poly(benzodifurandione) exhibits superior resistance to environmental impacts. For example, its thermal decomposition temperature is >380℃, and its conductivity decreases by less than 5% after 1000 hours of storage at 135℃. Therefore, using poly(benzodifurandione) as the cathode layer of a capacitor core allows the capacitor core and the resulting poly(benzodifurandione) capacitor to possess excellent thermal stability, high operating temperature, and long service life. Furthermore, its high conductivity and excellent resistance to environmental impacts also enable the first cathode layer to maintain superior long-term conductivity, ensuring good conductivity even under prolonged use.

[0046] In the embodiments of this application, the methods for forming the first cathode layer on the anode body include, but are not limited to, chemical methods, electrochemical methods, and physical methods. The chemical method, also known as in-situ chemical polymerization, involves sequentially impregnating the anode body with an oxidant and a monomer, and then subjecting the polymerization reaction under specific conditions to form a polymer cathode. The physical method involves repeatedly impregnating an anode block containing a guiding layer into a prepolymer dispersion, followed by heating and curing after each impregnation. The electrochemical method involves depositing the polymer on the anode body via electrolysis; the specific principle can be referenced from existing methods for forming cathode layers.

[0047] Different methods have different advantages and disadvantages. For example, chemical methods offer better capacity extraction and lower ESR, but suffer from poor polymer layer uniformity, poor coverage, and lower withstand voltage. Physical methods allow for easy thickness control and can be repeated multiple times to obtain a dense cathode layer, resulting in higher withstand voltage, but lower capacity extraction is due to the larger dispersion particle size. Electrochemical methods offer excellent coverage, effectively covering the anode surface and reducing ESR, but have lower withstand voltage.

[0048] In some embodiments of this application, a method for forming a first cathode layer by chemical in-situ polymerization is also provided to further improve the uniformity and density of the cathode layer, so as to better cover the surface of the dielectric layer and the pores of the porous anode body.

[0049] In this embodiment, generating a first cathode layer on the anode body to obtain a first intermediate may include: obtaining a pretreatment solution, an oxidant solution, and a polymer monomer solution; impregnating the anode body with the pretreatment solution and drying it; impregnating the anode body with the oxidant solution and drying it; repeating the following first process a fourth preset number of times: impregnating the anode body with the polymer monomer solution and drying it; impregnating the anode body with the oxidant solution and drying it.

[0050] In-situ chemical polymerization involves impregnating a polymer monomer with an oxidant to induce a polymerization reaction, thereby generating a polymer cathode. Therefore, in this embodiment, an oxidant solution and a polymer monomer solution including a benzodifurandione monomer are required. The oxidant solution is used to react with the benzodifurandione to generate poly(benzodifurandione).

[0051] Based on this, the polymer monomer solution of this application can be one or more of benzodifurandione and N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, alcohol solvents and ester solvents.

[0052] Accordingly, the oxidant solution is a mixture of at least one of organic quinones, phosphomolybdic acid, peroxides, metal salts, persulfates, perborates, and perbenzoic acids with at least one of amide solvents, sulfoxide / sulfone solvents, alcohols, esters, alicyclic hydrocarbon solvents, halogenated hydrocarbon solvents, ether solvents, and ketone solvents.

[0053] During the formation of the first cathode layer, if the initial polymerization rate is too fast, the polymer may grow too quickly, clogging the pores of the anode and causing a loss of capacity. Therefore, in the embodiments of this application, a pretreatment solution is used for pretreatment. That is, the anode is first impregnated with the pretreatment solution and dried, and then impregnated with an oxidant solution and dried, completing one polymerization reaction using the pretreatment solution.

[0054] In this embodiment, both the pretreatment solution and the polymer monomer solution comprise benzodifurandione, and the concentration of benzodifurandione in the pretreatment solution is lower than the concentration of benzodifurandione in the polymer monomer solution. For example, in some embodiments, the pretreatment solution may contain 0.1 wt% to 10 wt% benzodifurandione, and its solvent may be one or more of water, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, alcohol solvents, and ester solvents.

[0055] In this embodiment, impregnation with a low-concentration pretreatment solution helps to reduce the initial reaction rate, thereby preventing the polymer from growing too quickly and clogging the pores of the anode body, resulting in a loss of capacity. This, in turn, helps to improve the performance of the capacitor core and the capacitor made from it.

[0056] The anode body and the first cathode layer are made of different materials. The anode body is an inorganic material, while the poly(benzodifuran dione) is an organic material. Compared to the same material, the bonding between different materials may be poor. Therefore, it is necessary to enhance the connection strength between the anode body and the first cathode layer.

[0057] In some embodiments of this application, the pretreatment solution further includes silanes. For example, 0.1 wt% to 5 wt% of one or more of (γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane) may be added to the pretreatment solution.

[0058] Accordingly, the pretreatment solution may include: 0.1wt%-10wt% of benzodifuran dione, 0.1wt%-5wt% of (one or more of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane), wherein the solvent is (one or more of water, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, alcohol solvents and ester solvents).

[0059] Silanes are commonly used to bond inorganic and organic materials, enhancing the connection strength through chemical bonds and interactions. Therefore, in the embodiments of this application, adding silanes to the pretreatment solution can effectively strengthen the connection between the dielectric layer on the anode and the first cathode layer, thereby improving the performance of the capacitor core and the capacitor made from it.

[0060] The pretreatment solution may also include polyhydroxy substances, including but not limited to polyvinyl alcohol, polyethylene glycol, and erythritol. The pretreatment solution may also include bifunctional substances such as isocyanates. No restrictions are imposed here.

[0061] In the above embodiments, during the formation of the first cathode layer, the impregnation with the pretreatment solution and drying, and the impregnation with the oxidant solution and drying are generally performed once, but can be performed more times according to actual needs, and are not limited here.

[0062] In this process, the number of times the fourth preset number of times can be executed can be between 1 and 22. Specifically, the thickness of the first cathode layer can be determined according to the requirements of the capacitor size, performance, etc., and then the fourth preset number of times can be determined based on the thickness of the first cathode layer. The specific number of times is not limited here.

[0063] In the above embodiments, the drying temperature range can be 40℃-180℃. Similarly, the specific temperature can be determined based on factors such as the size and performance of the capacitor, the current thickness of the first cathode layer, and the reaction rate requirements, and is not limited here.

[0064] S230, a second cathode layer is generated on the first cathode layer of the first intermediate to obtain the second intermediate.

[0065] The capacitor core provided in this application includes two cathode layers, namely a first cathode layer and a second cathode layer. The second cathode layer is a poly(3,4-ethylenedioxythiophene) thin film layer, that is, there is a poly(3,4-ethylenedioxythiophene) thin film layer on top of the poly(benzodifuran dione) layer.

[0066] In the embodiments of this application, the poly(3,4-ethylenedioxythiophene) film layer may be a modified poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid film layer, or a modified PEDOT:PSS film layer.

[0067] For ease of understanding, the cathode layer structure will again be explained using a chip capacitor core as an example. Please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of the structure of a capacitor core provided in an embodiment of this application. In this embodiment, the anode body includes an anode 11 and an insulating layer 12. A first cathode layer 31 is in contact with the anode body and is used to directly cover the anode body. A second cathode layer 32 is on top of the first cathode layer 31 and covers the first cathode layer 31.

[0068] The aforementioned first cathode layer formed by poly(benzodifurandione) exhibits good performance in terms of conductivity, high temperature resistance, moisture resistance, and capacitance extraction rate. However, poly(benzodifurandione) still has some drawbacks, namely, poor mechanical resistance of the conductive polymer and poor edge coverage of the cathode layer. Poor mechanical resistance of the conductive polymer refers to the poor resistance of the N-type conductive polymer formed by poly(benzodifurandione) on the capacitor anode to external stress, making it prone to cracking. This leads to a decrease in the yield of capacitors prepared using this method and an increase in leakage current. Poor edge coverage of the cathode layer refers to the difficulty in achieving complete coverage of the capacitor anode. For example, it is difficult to achieve dense coverage of the edges of aluminum foil and tantalum cores, thus increasing the risk of direct contact between the graphite layer and the silver layer and the capacitor anode core. If the graphite layer or silver layer directly contacts the anode core, it will cause a sharp drop in the capacitor's withstand voltage, resulting in a decrease in the capacitor's reliability and voltage withstand capability.

[0069] For example, please see Figure 4 , Figure 4 For the existing Figure 4 A schematic diagram of a poly(benzodifurandione) layer. The left side shows a surface view of the poly(benzodifurandione). Figure 4 The right side shows the interface diagram of the poly(benzodifurandione) layer. As shown in the surface diagram, there are some cracks on the surface of the poly(benzodifurandione) layer. As shown in the cross-sectional diagram, there are large gaps between the poly(benzodifurandione) layer and the anode body, and the coating is uneven.

[0070] To address this problem, this application addresses the issue by generating a cathode layer made of poly(benzodioxythiophene) on top of a first cathode layer, thereby leveraging the properties of poly(benzodioxythiophene) to overcome the defects present in the poly(benzodifurandione) layer.

[0071] Compared to poly(benzodifurandione), poly(3,4-ethylenedioxythiophene) exhibits superior film-forming properties, enabling better coating of the anode. Please refer to [link to relevant documentation]. Figure 5 , Figure 5 This is a schematic diagram of a poly(3,4-ethylenedioxythiophene) thin film layer provided in an embodiment of this application. Figure 5 The left side shows a surface view of the poly(3,4-ethylenedioxythiophene) thin film. Figure 5 The right side shows a cross-sectional view of the poly(3,4-ethylenedioxythiophene) thin film. As shown in the surface diagram, compared to... Figure 4 The surface diagram shown. Figure 5 The number of cracks on the surface shown is significantly reduced. Comparing this to the interface diagram, Figure 5 The cross-sectional image shown shows that the poly(3,4-ethylenedioxythiophene) film layer is more uniform, denser, and has stronger coating properties.

[0072] Therefore, in the embodiments of this application, in addition to the poly(benzodifuran dione) layer, poly(3,4-ethylenedioxythiophene) is also used to form a poly(3,4-ethylenedioxythiophene) thin film layer. The poly(3,4-ethylenedioxythiophene) layer can improve the mechanical resistance of the capacitor core and more uniformly and densely coat the anode body, thus solving the defects of the poly(benzodifuran dione) layer.

[0073] In the embodiments of this application, the poly(3,4-ethylenedioxythiophene) thin film layer can be generated using chemical, electrochemical, or physical methods. Specific methods can be referred to in the prior art and are not limited herein. The process for generating the second cathode layer can also refer to the prior art. For example, coating processes such as impregnation, roller coating, printing, and coating can be used to coat the anode body of the first cathode layer with various monomer materials of poly(3,4-ethylenedioxythiophene).

[0074] To further improve capacitor performance, a modified 3,4-ethylenedioxythiophene monomer solution can also be used to further enhance the performance of the capacitor core and the capacitors made from it.

[0075] For example, in some of these embodiments, the prepolymerized modified solution includes a first modified solution, a second modified solution, and a third modified solution, all of which include an aqueous dispersion of 3,4-ethylenedioxythiophene. The first modified solution includes a conductive reinforcing material, the second modified solution includes a bonding reinforcing material, and the third modified solution includes a strength reinforcing material.

[0076] For example, in one embodiment, the first modified solution contains 1 wt%-5 wt% of an aqueous dispersion of 3,4-ethylenedioxythiophene, PEDOT:PSS, and 1 wt%-10 wt% of DMSO (dimethyl sulfoxide), which can act as a conductivity enhancer for PEDOT:PSS.

[0077] The second modified solution may contain: 1 wt%-5 wt% PEDOT:PSS, 1 wt%-10 wt% organic solvent (one or more of N,N-dimethylformamide, dimethyl sulfoxide, ethylene glycol, tetrahydrofuran, sorbitol, methanol, isopropanol, and glycerol), and 0.1 wt%-35 wt% of (one or more of ethylene glycol, glycerol, polyethylene glycol, polyglycerol, diglycerol, triglycerol, and tetraglycerol).

[0078] The third modified solution may contain: 1 wt%-5 wt% PEDOT:PSS, 1 wt%-10 wt% organic solvent (one or more of N,N-dimethylformamide, dimethyl sulfoxide, ethylene glycol, tetrahydrofuran, sorbitol, methanol, isopropanol, and glycerol), and 0.1 wt%-10 wt% water-soluble polymer resin (including but not limited to one or more of polyurethane, polyacrylic acid resin, water-soluble modified phenolic resin, hydroxypropyl methylcellulose, polyvinyl alcohol, and polyvinylpyrrolidone). The water-soluble polymer resin is used to increase strength and is a strength-enhancing material. In other embodiments, other types of strength-enhancing materials may also be used, which are not limited herein.

[0079] Accordingly, generating a second cathode layer on top of the first cathode layer of the first intermediate may include: obtaining a prepolymerized modified solution of poly(3,4-ethylenedioxythiophene); performing a first preset number of impregnations with the first modified solution and drying; performing a second preset number of impregnations with the second modified solution and drying; and performing a third preset number of impregnations with the second modified solution and drying to obtain the second intermediate.

[0080] In the embodiments of this application, the first preset number of times, the second preset number of times, and the third preset number of times can be configured according to the performance and requirements of the capacitor. For example, the range of the first preset number of times is 1-5, the range of the second preset number of times is 1-10, and the range of the third preset number of times is 1-10. The specific number of times is not limited here.

[0081] The first modification solution can improve the capacitance extraction rate of the capacitor. The second modification solution can strengthen the bond strength between the polymers formed by the first and third modification solutions, thereby improving the voltage withstand capability of the capacitor core and the capacitor. The third modification solution can increase the mechanical strength and film-forming properties of the formed film, allowing for a more complete coating of the polymer film layer, increasing the structural strength of the cathode, and improving the overall voltage withstand capability and stress resistance of the core.

[0082] Poly(3,4-ethylenedioxythiophene) is a cathode layer material currently used in electrolytic capacitors. However, it still has some drawbacks. For example, the synthesis of poly(3,4-ethylenedioxythiophene) requires the use of an acidic solution. This acidic solution contains a large number of sulfonic acid functional groups and is highly corrosive. The acidic solution will corrode the dielectric layer of the anode, thereby affecting the voltage withstand capability of the capacitor.

[0083] Meanwhile, this material is highly hygroscopic, making it prone to swelling and absorbing moisture in humid air. This can lead to problems such as separation of the cathode layer from the anode and corrosion, impacting the reliability of the capacitor. During manufacturing, the material requires washing to remove byproducts, which also contributes to its moisture absorption, resulting in a porous structure that is easily detached.

[0084] Furthermore, the material has a relatively large particle size; some high-specific-capacity tantalum powders and aluminum foils have particle sizes larger than the pore size of the anode body, making it difficult to completely fill the anode body. In addition, poly(3,4-ethylenedioxythiophene) will also cause dedoping of the poly(3,4-ethylenedioxythiophene) layer during repeated charge and discharge, thereby degrading its conductivity.

[0085] Poly(benzodifurandione) has advantages such as moisture resistance, high temperature resistance, non-corrosion of the anode, high conductivity and long-term retention. Therefore, in the embodiments of this application, a poly(benzodifurandione) layer is used as the inner layer of the cathode layer on the anode body, and a PEDOT:PSS thin film layer is used as the outer layer of the cathode layer. The advantages and disadvantages of the two cathode layers complement each other, which can effectively improve the performance of the capacitor core and the capacitor made therefrom, as well as improve the yield rate of production.

[0086] The first cathode layer and the second cathode layer are also made of two different materials. At the same time, as mentioned earlier, poly(3,4-ethylenedioxythiophene) is not resistant to moisture and is prone to peeling. This will lead to increased leakage current, increased risk of failure, decreased yield, reduced capacitor reliability, and increased production costs.

[0087] Based on this, in some embodiments of this application, generating a second cathode layer on top of the first cathode layer of the first intermediate may include: generating a connecting layer on the surface of the first cathode layer; generating a second cathode layer on the connecting layer so that the connecting layer is chemically bonded to the first cathode layer and the second cathode layer.

[0088] Please see Figure 3 In the embodiments of this application, a connecting layer 33 is further provided between the first cathode layer 31 and the second cathode layer 32. The connecting layer 33 can chemically bond the first cathode layer 31 and the second cathode layer 32 to improve the connection strength between the first cathode layer 31 and the second cathode layer 32, thereby reducing the occurrence of moisture absorption and peeling of the second cathode layer 32 and increasing the long-term reliability of the manufactured capacitor core and capacitor.

[0089] In some embodiments of this application, forming a bonding layer on the surface of the first cathode layer includes: coating the surface of the first cathode layer with a bonding layer solution based on a preset coating process to form a bonding layer.

[0090] In the embodiments of this application, the pre-coating process includes, but is not limited to, methods such as dipping, roller coating, printing, and plating to apply the bonding layer solution to the anode body after the first cathode layer has been coated. Specific methods of the coating process can be found in the prior art and will not be elaborated upon here.

[0091] In embodiments of this application, the linker layer solution comprises silane-based substances and / or polyhydroxy substances. Accordingly, the linker layer 33 also comprises one or more of silane-based substances and polyhydroxy substances.

[0092] In some embodiments of this application, the silane substance includes one or more of the following: γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0093] For example, the linker layer solution is a solution containing 0.1 wt% to 5 wt% of one or more of (γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane), and its solvent is one or more of (water, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, alcohol solvents, and ester solvents).

[0094] Polyhydroxy substances include, but are not limited to, polyvinyl alcohol, polyethylene glycol, and erythritol. Furthermore, the linker layer solution may also include bifunctional substances such as isocyanates.

[0095] In this embodiment, the connection layer can effectively improve the connection strength between the first cathode layer and the second cathode layer. At the same time, it can also effectively reduce the occurrence of the second cathode layer peeling off due to water absorption, which helps to improve the overall performance of the capacitor.

[0096] S240, based on the second intermediate component for manufacturing capacitor cores.

[0097] In this embodiment of the application, manufacturing a capacitor core based on a second intermediate component may include: impregnating a second cathode layer with conductive graphite and drying it to form a graphite layer on the surface of the second cathode layer; and then impregnating the second cathode layer with a conductive silver paste layer to form a silver layer on the surface of the graphite layer. The methods for forming the graphite layer and the silver layer described above can be found in existing technologies and will not be elaborated upon here.

[0098] In the above embodiments, the cathode layer of the capacitor core comprises two layers: a first cathode layer and a second cathode layer. The first cathode layer is the inner layer, and the second cathode layer is the outer layer. The inner layer is a poly(benzodifurandione) layer. Poly(benzodifurandione) has high conductivity and long-term conductivity retention, which can effectively improve the ESR performance of the capacitor core and the capacitor. Furthermore, poly(benzodifurandione) has high thermal stability and a high thermal decomposition temperature, enabling its use at high temperatures and contributing to extended service life. Poly(benzodifurandione) is moisture-resistant and does not deteriorate in high-temperature and high-humidity environments. Moreover, poly(benzodifurandione) is an N-type conductive polymer material. Compared to poly(3,4-ethylenedioxythiophene PEDOT:PSS), poly(benzodifurandione) does not corrode the anode material, thus avoiding damage to the dielectric layer on the anode body, thereby contributing to an increase in the rated voltage of the capacitor. Therefore, using poly(benzodifurandione) as the first cathode layer can effectively improve the performance of the capacitor core. To address the inherent defects of poly(benzodifurandione), namely its poor resistance to external stress and poor encapsulation, in the embodiments of this application, a second cathode layer is formed on top of the first cathode layer to encapsulate and protect the poly(benzodifurandione) layer. The second cathode layer is a poly(3,4-ethylenedioxythiophene) PEDOT:PSS thin film. The PEDOT:PSS film exhibits high elasticity, high mechanical strength, and high thermal stability, enabling it to form a complete conductive film encapsulating the capacitor anode, thus withstanding the stress during processing to prevent damage to the dielectric layer, thereby improving capacitor manufacturing yield and contributing to further increasing the capacitor's withstand voltage. Simultaneously, to avoid the moisture absorption and peeling defects inherent in PEDOT:PSS, a poly(benzodifurandione) layer is used in the inner layer to address these defects. PEDOT:PSS has the property of corroding the anode, and poly(benzodifurandione) also has better conductivity. Therefore, compared with PEDOT:PSS, using a poly(benzodifurandione) layer as the inner layer can help improve capacitance extraction rate and conductivity, thereby helping to improve the overall conductivity of the cathode layer. Therefore, in this embodiment, a poly(benzodifurandione) layer is used as the inner layer of the cathode layer on the anode, and a PEDOT:PSS thin film layer is used as the outer layer of the cathode layer. The advantages and disadvantages of the two cathode layers complement each other, which can effectively improve the performance of the capacitor core and the capacitor made from it, as well as improve the yield rate of manufacturing.

[0099] The aforementioned capacitor core can be used to manufacture electrolytic capacitors. Therefore, based on the same inventive concept, this application also provides a method for manufacturing an electrolytic capacitor, the method comprising: A capacitor core is manufactured using manufacturing methods S210-S230; the capacitor core is then encapsulated to obtain an electrolytic capacitor.

[0100] In the embodiments of this application, the capacitor core coated with graphite silver paste can be assembled and packaged, and positive and negative electrodes can be led out. The assembly can be a single anode or multiple anodes stacked together. The packaging can be any packaging method well known in the art, including but not limited to metal casing packaging, epoxy resin encapsulation, etc. Specific details can be found in the prior art, and will not be elaborated further here.

[0101] In addition, after the encapsulation is completed, the manufacturing method of the electrolytic capacitor may also include: testing the electrolytic capacitor to obtain an electrolytic capacitor that passes the test.

[0102] The testing methods include, but are not limited to, electrical performance testing and external stress testing, such as applying voltage for testing and high-temperature aging testing, in order to screen out defective products.

[0103] The encapsulation and testing processes described above can be referenced from existing technologies and will not be elaborated upon here. The capacitor core obtained through the aforementioned embodiments, when used to manufacture an electrolytic capacitor, can effectively improve the performance of the electrolytic capacitor.

[0104] Next, the method for manufacturing the capacitor provided in this application will be described in conjunction with the methods provided in the above embodiments.

[0105] First, the anode body is obtained. Taking a chip capacitor as an example, the preparation of the anode body includes: cutting the aluminum foil into specified sizes and welding it onto a steel strip; applying a separating adhesive to a fixed position on the cut aluminum foil; and immersing the product coated with the separating adhesive into the forming solution for further forming.

[0106] Then, a first cathode layer is formed on the anode body. Pretreatment is performed by first impregnating the anode body with a pretreatment solution and then drying it, followed by impregnation with an oxidant solution and then drying it. Then, a first process is executed for a fourth predetermined number of rounds. The first process includes: impregnating the anode body with a polymer monomer solution and then drying it; impregnating the anode body with an oxidant solution and then drying it, thereby obtaining a first intermediate. The pretreatment solution, polymer monomer solution, and oxidant solution can be referenced in the aforementioned embodiments, and the drying temperature can also be referenced in the aforementioned embodiments, and will not be elaborated here.

[0107] Then, based on a preset coating process, a bonding layer solution is coated onto the surface of the first cathode layer to form a bonding layer.

[0108] Then, a second cathode layer is formed on the connecting layer, so that the connecting layer chemically bonds the first cathode layer and the second cathode layer. This includes: performing a first preset number of immersions in the first modified solution and drying; performing a second preset number of immersions in the second modified solution and drying; and performing a third preset number of immersions in the second modified solution and drying to obtain a second intermediate.

[0109] Finally, the capacitor core is manufactured based on the second intermediate component, and the capacitor core is packaged to obtain an electrolytic capacitor. The electrolytic capacitor is then tested to screen out defective products, thus completing the entire manufacturing process of the electrolytic capacitor.

[0110] To facilitate understanding of the performance improvements of the capacitors provided in this application, a comparative explanation is provided here in conjunction with capacitors of different types of cathode layer materials.

[0111] According to Embodiment 1 of this application, the manufacturing process of the electrolytic capacitor includes: immersing the anode body in a pretreatment solution and drying it at 120°C for 2 minutes, then immersing the anode body in an oxidant solution and drying it at 120°C for 2 minutes. Next, the anode body A is sequentially immersed in a polymer monomer solution and dried at 120°C for 1 minute, then immersed in an oxidant solution and dried at 120°C for 1 minute, repeating this polymer monomer solution-oxidant solution process 6 times to obtain an anode body coated with a first cathode layer, i.e., obtaining a first intermediate component. The intermediate component is immersed in a connecting layer solution and dried at 150°C for 30 minutes to form a connecting layer. Then, the first intermediate component with the connecting layer is immersed in the first modified solution and dried at 120°C for 30 minutes, repeating this process twice. Then, the first intermediate component is immersed in a second modified solution and dried at 120°C for 30 minutes, repeating this process 3 times. Then, the first intermediate component is immersed in a third modified solution and dried at 150°C for 30 minutes, repeating this process twice, to obtain a second intermediate component. The second intermediate component is coated with a first conductive layer of graphite and a second conductive layer of silver paste to obtain a capacitor core. Multiple capacitor cores are stacked, and their positive and negative terminals are led out, then packaged and screened to obtain a finished capacitor. Its four parameters are then tested. The four parameters include: CAP (capacitance), DF (dissipation tangent), ESR (equivalent series resistance), and LC (leakage current).

[0112] The cathode layer of Comparative Example 1 is a single poly(benzodifurandione) layer. The manufacturing process of Comparative Example 1 includes: immersing anode body A in an aqueous solution containing 1% γ-glycidyl etheroxypropyltrimethoxysilane and drying it at 150°C for 30 minutes to functionalize the surface of the anode body; then immersing anode body A sequentially in an ethanol solution of benzodifurandione and drying it at 120°C for one minute, then immersing it in a dimethyl sulfoxide solution of tetramethylbenzoquinone and drying it at 120°C for one minute, repeating this process 10 times; then immersing anode body A in an outer film layer solution, which is an N,N-dimethylacetamide solution containing benzodifurandione and tetramethylbenzoquinone; then coating anode body A with a first conductive layer of graphite and a second conductive layer of silver paste to obtain capacitor core B; stacking multiple capacitor cores B, leading out their positive and negative electrodes, encapsulating them, and screening them to obtain finished capacitors, and testing their four parameters. Among them, due to the low withstand voltage of Comparative Example 1, all capacitors broke down during the production process and could not be made into capacitors with a rated voltage of 35V.

[0113] The cathode layer of Comparative Example 2 is a poly(3,4-ethylenedioxythiophene) layer. The manufacturing process of Comparative Example 2 includes: immersing anode body A in a solution containing 1% γ- The anode body was surface functionalized by immersing it in an aqueous solution of glycidyl etheroxypropyltrimethoxysilane and drying it at 150°C for 30 minutes. Then, the anode body A was immersed in a self-doped PEDOT conductive polymer solution and dried at 120°C for 30 minutes, repeating this process four times. Next, the anode body A was immersed in a PEDOT:PSS aqueous dispersion with a particle size D50 = 30 nm and dried at 120°C for 30 minutes, repeating this process ten times. Then, the anode body A was immersed in an aqueous solution containing polyglycerol and dried at 150°C for 30 minutes, repeating this process twice. Finally, the anode body A was sequentially immersed in an adhesive solution and dried at 150°C for 30 minutes, then immersed in a high-viscosity PEDOT:PSS aqueous dispersion and dried at 150°C for 30 minutes, repeating this process twice. The anode body A was then coated with a first conductive layer of graphite and a second conductive layer of silver paste to obtain capacitor core C. Multiple capacitor cores C were stacked, their positive and negative electrodes were led out, and they were packaged and screened to obtain the finished capacitor. Its four parameters were then tested.

[0114] Please refer to Table 1, which compares the electrical parameters of the comparative example and the embodiment before and after the dual 85 power-on:

[0115] Table 1. Comparison of electrical parameters before and after powering on the comparative examples and embodiments (85). "Double 85" refers to the capacitor being in a temperature of 85°C and a humidity of 85%RH. As shown in Table 1, the capacitor of Embodiment 1 provided in this application has a smaller equivalent series resistance and leakage current than the capacitor of Comparative Example 2 under similar capacitance conditions. After working for 1000 hours, the capacitor of Embodiment 1 provided in this application can still work normally, while the capacitor of Comparative Example 2 has cracked.

[0116] Please refer to Table 2, which compares the electrical parameters of the comparative example and Example 1 before and after 135℃ / 2000h.

[0117]

[0118] Table 2 Comparison of electrical parameters before and after 2000 h at 135℃ for the comparative example and the example. As shown in Table 2, the capacitor provided in Embodiment 1 of this application still has superior performance. Compared with the capacitor in Comparative Embodiment 2, the capacitor in Embodiment 1 of this application has a smaller equivalent series resistance and leakage current when the capacitance is similar. After working for 2000 hours, the capacitor in Embodiment 1 of this application can still work normally, while the capacitor in Comparative Embodiment 2 has gradually shown signs of breakdown.

[0119] Among them, the capacitors prepared in Comparative Example 1 had low withstand voltage and all broke down during the production process, making it impossible to prepare capacitors with a rated voltage of 35V. Therefore, there is no corresponding comparison table.

[0120] Based on the same inventive concept, this application also provides a capacitor core, which includes: an anode body, a first cathode layer, a second cathode layer, and a conductive layer.

[0121] The first cathode layer covers the surface of the anode body; the first cathode layer is a poly(benzodifuran dione) layer. The second cathode layer is on top of the first cathode layer; the second cathode layer is a poly(3,4-ethylenedioxythiophene) thin film layer. A conductive layer covers the second cathode layer.

[0122] In one embodiment, the capacitor core further includes a connecting layer; the connecting layer is located between the first cathode layer and the second cathode layer, and is used to chemically bond the first cathode layer and the second cathode layer.

[0123] In the embodiments of this application, the capacitor core may be block-shaped, sheet-shaped, column-shaped, or wound, and the specific structure is not limited herein.

[0124] The structure and performance of this capacitor core can be referred to the aforementioned capacitor core manufacturing process, and will not be repeated here.

[0125] Based on the same inventive concept, this application also provides an electrolytic capacitor, including a capacitor core and a package body provided / manufactured as described in the foregoing embodiments, wherein the capacitor core is located within the package body.

[0126] Based on the same inventive concept, this application also provides an electronic product that includes the electrolytic capacitor provided in the foregoing embodiments. This electronic product includes, but is not limited to, various functional modules, circuits, or other products using the aforementioned electrolytic capacitor. The above embodiments can be freely combined without conflict, and the resulting embodiments are covered within the protection scope of this application.

[0127] The above detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0128] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0129] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0130] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for manufacturing a capacitor core, characterized in that, include: Obtain the anode body; A first cathode layer is formed on the anode body to obtain a first intermediate component; The first cathode layer is a poly(benzodifurandione) layer; A second cathode layer is formed on the first cathode layer of the first intermediate to obtain a second intermediate; the second cathode layer is a poly(3,4-ethylenedioxythiophene) thin film layer. The capacitor core is manufactured based on the second intermediate.

2. The method for manufacturing a capacitor core according to claim 1, characterized in that, Forming a second cathode layer on top of the first cathode layer of the first intermediate includes: A bonding layer is formed on the surface of the first cathode layer; A second cathode layer is formed on the bonding layer so that the bonding layer chemically bonds the first cathode layer and the second cathode layer.

3. The method for manufacturing a capacitor core according to claim 2, characterized in that, A bonding layer is formed on the surface of the first cathode layer, including: The bonding layer is formed by coating the surface of the first cathode layer with a bonding layer solution based on a preset coating process. The connecting layer solution includes silanes and / or polyhydroxy substances.

4. The method for manufacturing a capacitor core according to claim 3, characterized in that, The silanes include one or more of the following: γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

5. The method for manufacturing a capacitor core according to claim 1, characterized in that, The step of generating a second cathode layer on top of the first cathode layer of the first intermediate includes: A prepolymerized modified solution of the poly(3,4-ethylenedioxythiophene) is obtained; the prepolymerized modified solution includes a first modified solution, a second modified solution, and a third modified solution; the first modified solution, the second modified solution, and the third modified solution all include an aqueous dispersion of 3,4-ethylenedioxythiophene, and the first modified solution includes a conductive reinforcing material, the second modified solution includes a bonding reinforcing material, and the third modified solution includes a strength reinforcing material; The process involves immersing the first modified solution in the solution and then drying it a first preset number of times. Perform the second preset number of immersions in the second modified solution and then dry them; The second modified solution is immersed and dried a third preset number of times to obtain the second intermediate.

6. The method for manufacturing a capacitor core according to any one of claims 1-5, characterized in that, The process of forming a first cathode layer on the anode body to obtain a first intermediate includes: Obtain pretreatment solution, oxidant solution, and polymer monomer solution; The anode body is impregnated with the pretreatment solution and then dried. The anode body is impregnated with the oxidant solution and then dried. Repeat the first process the fourth preset number of times: impregnate the anode body with the polymer monomer solution and dry it; impregnate the anode body with the oxidant solution and dry it; The pretreatment solution and the polymer monomer solution include benzodifurandione, and the concentration of benzodifurandione in the pretreatment solution is less than the concentration of benzodifurandione in the polymer monomer solution. The oxidant solution is used to react with the benzodifurandione to generate the poly(benzodifurandione).

7. The method for manufacturing a capacitor core according to claim 6, characterized in that, The pretreatment solution further includes silanes, including one or more of the following: γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

8. A method for manufacturing a capacitor, characterized in that, include: The capacitor core is manufactured by the manufacturing method according to any one of claims 1-7; The capacitor core is then encapsulated to obtain an electrolytic capacitor.

9. A capacitor core, characterized in that, include: Anode body, first cathode layer, second cathode layer, conductive layer; The first cathode layer covers the surface of the anode body; The first cathode layer is a poly(benzodifurandione) layer; The second cathode layer is located above the first cathode layer; the second cathode layer is a poly(3,4-ethylenedioxythiophene) thin film layer. The conductive layer covers the second cathode layer.

10. The capacitor core according to claim 9, characterized in that, The capacitor core further includes: a connecting layer; The connecting layer is located between the first cathode layer and the second cathode layer, and is used to chemically bond the first cathode layer and the second cathode layer.

11. An electrolytic capacitor, characterized in that, include: The capacitor core and package as described in claim 9 or 10; The capacitor core is housed within the package.

12. An electronic product, characterized in that, include: The electrolytic capacitor as described in claim 11.

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