A highly conductive composite carbon fiber cloth based on plant reticulate leaf veins, its preparation method and application

Abstract

This invention discloses a highly conductive composite carbon fiber fabric based on plant vein mesh, its preparation method, and its applications. Carbon fibers, possessing good conductivity and flexibility, are used as yarns for the vein portion, and a leaf vein-like structure is woven on a loom. The composite process imparts high conductivity to the vein portion. The vein portion forms the inner layer, while graphene fiber fabric, made from graphene, forms the outer layer to address the issue of weak interactions between carbon-based fibers. Finally, the entire fabric is manufactured using a hot-pressing process. This invention, through its plant vein mesh structure, enables the fabric to possess both high conductivity and high fault tolerance. This flexible, highly conductive composite carbon fiber fabric solves the problem that ordinary carbon fiber materials cannot simultaneously possess flexibility, high specific surface area, and high conductivity.

Description

Technical Field

[0001] This invention relates to the field of artificial spinning technology, specifically to a highly conductive composite carbon fiber cloth based on plant reticulated leaf veins, its preparation method, and its application. Background Technology

[0002] Carbon fiber conductive cloth, as a high-performance functional material, possesses excellent conductivity and mechanical strength, but its large-scale application is still limited by three bottlenecks:

[0003] (1) Rigidity and flexibility cannot be achieved at the same time: after high-temperature carbonization (1000~1500℃), the modulus of polyacrylonitrile-based carbon fiber is significantly improved, but the orientation of molecular chains leads to a decrease in toughness, and brittle fracture is likely to occur when the bending radius is <5 mm.

[0004] (2) Interfacial bonding defects: Carbon fiber surface energy <40 mJ / m 2 Its chemical inertness results in an interfacial shear strength of <15 MPa between it and the resin matrix or functional coating (such as metal, graphene) (only 1 / 5 of that of copper foil composites), even after repeated bending 10 times. 4 The subsequent conductive layer peeling rate is >90%;

[0005] (3) Functional and scenario separation: Unmodified carbon cloth has a contact angle of >120°, signal response delay of >500 ms in body fluid / sweat environment (biosensor requirement <100 ms), and porosity <5% leads to loss of breathability (wearable scenario requirement >40%).

[0006] Traditional graphene nonwoven fabrics are mainly prepared by vacuum filtration or spray deposition of graphene oxide (GO) solutions to form continuous sheet structures (such as thin films or paper-like materials). While these materials possess high conductivity (10⁻⁶),... 4 -10 5 However, its two-dimensional layered stacked structure has the following obvious defects: (S / m),

[0007] (a) Intrinsic brittleness: The lamellar layers are bonded only by van der Waals forces, and cracking occurs when the bending radius is <5 mm;

[0008] (b) Structural-functional incompatibility: Dense stacking results in a porosity of <40%, making it impossible to simultaneously satisfy both air permeability (medical dressings require >60%) and absorbency (sensor interfaces require >70 μm). 2 Multiple requirements, including specific surface area ( / g) and resin wettability (composite materials need to have a permeability of >80%);

[0009] (c) Poor scalability: The solution deposition rate is only 0.1–0.5 μm / min, and it takes more than 3 hours to prepare a 100 μm thick film. Large-area finished products are prone to edge warping. For example, when the area is greater than 1 m², the edge warping is greater than 15° (industrial applications require less than 5°).

[0010] In summary, existing technologies have fallen into a vicious cycle where "increased conductivity leads to decreased flexibility, which in turn reduces functionality and consequently worsens manufacturability." A novel structure is urgently needed to break through the two-dimensional stacking paradigm, escape the vicious cycle, and thus solve the aforementioned technical problems. Summary of the Invention

[0011] To address the problems of the prior art, this invention provides a highly conductive composite carbon fiber cloth based on plant reticulate leaf veins, its preparation method, and its application.

[0012] The technical solution adopted in this invention is as follows:

[0013] A highly conductive composite carbon fiber cloth based on plant reticulated leaf veins, comprising:

[0014] Carbon fiber inner layer: carbon fiber matrix with a hierarchical conductive network that mimics plant leaf veins;

[0015] Graphene outer layer: Graphene fibers randomly interlocked to form a conductive network;

[0016] The inner carbon fiber layer and the outer graphene layer are hot-pressed together to form a highly conductive composite carbon fiber cloth with a synergistic conductive structure.

[0017] Furthermore, the plant leaf vein hierarchical conductive network includes a main vein, primary branches, and secondary branches. The main vein is connected to an external power input terminal and transmits electrical signals to the primary branches. The primary branches extend to the functional area and distribute electrical signals to the secondary branches. The secondary branches are arranged in parallel, and adjacent secondary branches are connected through an electronically controlled switch module.

[0018] Furthermore, the width of the main vein is preferably 2-4 mm, the width of the first-order branch vein is 0.5-1 mm, and the width of the second-order branch vein is 0.1-0.3 mm.

[0019] Furthermore, the secondary branch is equipped with a fault-tolerant control circuit, including a current sensor and a comparator. The current sensor monitors the on / off state of the branch in real time. When the current value of the current branch is detected to be lower than the threshold, the comparator triggers the field-effect transistor switch of the adjacent branch to turn on. The field-effect transistor is preferably of metal-oxide-semiconductor (MOS) type.

[0020] The above-mentioned method for preparing composite carbon fiber cloth involves fusing the inner carbon fiber layer and the outer graphene layer through a hot-pressing process, forming a structure where the inner carbon fiber layer is a sandwich layer and the two sides are graphene outer layers. The inner carbon fiber layer consists of 5 to 10 layers, and the outer graphene layer on each side consists of 1 to 3 layers. A stepped temperature increase method is used during the hot-pressing process. Preferably, a 5-inner-2-outer stack is used for hot-pressing, that is, the inner carbon fiber layer has 5 layers, and the outer graphene layer on each side has 1 layer, for a total of 2 outer graphene layers.

[0021] Furthermore, the above-mentioned stepwise heating method is specifically as follows:

[0022] The first stage of preheating and pre-compression: starting from room temperature, the temperature is increased to 60~90℃, the pressure is controlled at 0.5~1MPa, and the heating time is controlled at 10~15 minutes. The purpose is to preheat the material, soften the matrix, reduce the viscosity, which is conducive to subsequent compaction and the discharge of internal gases / volatiles, so as to make the temperature more uniform.

[0023] The second stage of heating and pressurization: the temperature is increased from 60~90℃ to 150~200℃, the pressure is increased to 1~3MPa, the heating time is controlled at 15~20min, after the target temperature is reached, the pressure is increased to 3~6MPa, and the temperature is maintained for 10-15 minutes.

[0024] The third stage of heating and full pressure: the temperature is increased from 150~200℃ to above 250℃ (preferably 250~350℃), the pressure is increased to 6~8MPa, the heating time is controlled at 10~20min, after reaching the target temperature, the pressure is increased to 8~10MPa, and the constant temperature is maintained for 20-30 minutes to complete the high-temperature curing;

[0025] The fourth stage of cooling: reduce the temperature from above 250℃ to below 80℃, reduce the pressure to 2~3 MPa, then reduce the temperature to below 60℃, and then depressurize and remove the parts.

[0026] Furthermore, the method for preparing the carbon fiber inner layer includes the following steps:

[0027] S1. Carbon fiber is subjected to ultrasonic treatment with hydrochloric acid solution and low-temperature plasma activation;

[0028] S2. Gradient composite graphene oxide (GO) coating layer and reduced graphene oxide (rGO) conductive layer;

[0029] S3. Silver nanowires are incorporated into the rGO conductive layer, with the mass ratio of silver nanowires to rGO being 1:8~15 (preferably 1:10~12).

[0030] S4. The pattern of imitation plant leaf veins is woven into shape and then cured by hot pressing with polyamide lamination.

[0031] The aforementioned "four-square diagram" refers to a digital pattern generated in textile design software to guide weaving. This pattern uses regular squares as the basic unit, with each square corresponding to a yarn guide hole on the loom. By planning the arrangement and direction of the yarns within the squares, it simulates the hierarchical network shape of the main veins and branch veins of plant leaves.

[0032] More specifically, the method for preparing the carbon fiber inner layer includes the following steps:

[0033] (1) Carbon fiber pretreatment: The carbon fiber is immersed in 0.5~2mol / L hydrochloric acid solution (solid-liquid mass ratio of 1:10~15) and ultrasonically treated for 20~50 minutes to remove surface impurities and increase surface active sites. Low temperature plasma treatment is carried out under argon atmosphere (power 100~200W, time 3~8 min) to introduce oxygen-containing functional groups to enhance the interfacial bonding with graphene, and pretreated carbon fiber is obtained.

[0034] (2) Improved Hummers method for GO preparation: Graphite powder and concentrated nitric acid (mass ratio 1:2~4) were stirred in an ice bath for 10~15 hours, and after centrifugation and washing, the mixture was dispersed in xylene and ultrasonically treated for 10~30 minutes to obtain GO dispersion;

[0035] (3) Preparation of rGO dispersion: GO dispersion and ethylenediamine were reacted hydrothermally at 150-200℃ for 4-8 hours at a mass ratio of 1:1~3 to obtain rGO dispersion. Pyridine was added as a dopant, and the concentration of pyridine in the dispersion was controlled to improve the carrier mobility of rGO.

[0036] (4) Gradient composite first layer: The pretreated carbon fiber obtained in step (1) is immersed in GO solution (solid-liquid mass ratio is 1:80~120), stirred at 50~80℃ for 0.5~1.5 hours, ultrasonically assisted impregnation for 1~4 hours, and dried to form a GO coating layer with a thickness of 180~220nm;

[0037] (5) Gradient composite second layer: rGO is directionally deposited on the surface of GO coating layer by electrophoretic deposition, and silver nanowires are introduced as conductive bridges. The mass ratio of silver nanowires to rGO is 1:8~15 (preferably 1:10~12) to enhance the three-dimensional conductive network.

[0038] (6) The features of plant leaf vein tissue are implanted into the inner layer and represented in the form of a square diagram. Then, a composite carbon fiber layer is woven out using a loom.

[0039] (7) Using polyamide (PA) as the matrix, composite fibers are laminated and stacked (5-10 layers), and hot-pressed to achieve interfacial cross-linking to obtain carbon fiber inner layer. The hot-pressing temperature is 180~280℃, the hot-pressing pressure is 6~10MPa, and the hot-pressing time is 1~4 hours.

[0040] Furthermore, in step (5), the silver nanowires have a diameter of 25~35 nm (preferably 30 nm) and an aspect ratio >1000, forming a three-dimensional conductive bridging network.

[0041] Furthermore, the method for preparing the graphene outer layer includes the following steps:

[0042] Step 1: Wet spinning of GO short fibers, controlling the length to 20-50 mm and the diameter to 40-300 micrometers;

[0043] Step 2: Self-assemble in an ethanol-water solution to form a randomly overlapping GO fiber network;

[0044] Step 3: Gradient annealing in an inert atmosphere to achieve interface fusion.

[0045] More specifically, the preparation method of the graphene outer layer includes the following steps:

[0046] (a) Preparation of graphene oxide short fibers: Graphene oxide (GO) was dispersed in N,N-dimethylformamide (DMF) to form a spinning solution (mass-volume ratio of 1:25~40 g / ml) using wet spinning technology. The spinning solution was injected into an ethyl acetate coagulation bath using an injection pump. The rotation speed of the coagulation bath was adjusted to 40-420 rpm, and the injection speed ratio was 1:140-420. The fiber breaking length was controlled to be 20-50 mm and the diameter to be 40-300 micrometers to obtain GO short fibers. The short fibers were collected by vacuum filtration, dried and used for later use.

[0047] (b) Wet dispersion and interfacial fusion: The GO short fibers obtained in step (a) are redispersed in an ethanol-water solution (the volume ratio of water to ethanol is 1:1-3:1). A uniform suspension is formed by high-speed shearing and stirring. Dynamic filtration and deposition are performed using a mesh with a pore size of 400-600 micrometers. Solvent evaporation induces the self-assembly of π-π bonds between fibers to form a randomly overlapping GO fiber network (GOFF). In this process, the solvent polarity is adjusted by ethanol to inhibit the volume shrinkage caused by fiber swelling.

[0048] (c) High-temperature reduction and structural densification: GOFF is subjected to gradient thermal annealing in an inert atmosphere to achieve GO reduction and fiber interface fusion. High-temperature treatment promotes the repair of graphene sheet defects, and graphitization enhances the mechanical interlocking between fibers to obtain the outer layer of graphene.

[0049] Furthermore, it also includes a polytetrafluoroethylene microporous layer coated on the surface of the GO fiber network, the thickness of the polytetrafluoroethylene microporous layer being 0.04~0.07 mm and the contact angle being >150°.

[0050] The aforementioned highly conductive composite carbon fiber cloth, when applied to doubly-fed asynchronous wind turbines, can suppress the damage caused by bearing electrolytic corrosion.

[0051] Furthermore, the specific method of the above application is as follows: the above-mentioned highly conductive composite carbon fiber cloth is cut into a ring-shaped gasket and embedded in the mating surface between the bearing cover and the housing of the doubly fed asynchronous wind turbine. When the bearing is running, the static charge accumulated due to electromagnetic induction is introduced into the housing grounding system through the low resistance path of the gasket, so as to avoid the charge from discharging through the bearing raceway and forming electrolytic corrosion.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) This invention integrates the plant-like mesh leaf vein structure into the fabric, constructs a biomimetic conductive network with multi-level branches in the fabric, significantly improves the overall conductivity, and has a higher structural fault tolerance during operation, ensuring stable performance.

[0054] (2) The inner layer uses carbon fiber with excellent conductivity, heat resistance and chemical resistance as the yarn substrate; the outer layer is composite with reduced graphene impregnation liquid, which effectively overcomes the shortcomings of carbon fiber itself, such as insufficient toughness and poor bending resistance, and achieves complementary advantages of material properties.

[0055] (3) Graphene oxide (Go) is synthesized using the Hummers method, which has mature technology, high yield and excellent hydrophilicity of the product, which facilitates subsequent dispersion and compounding. GO is efficiently reduced by hydrazine hydrate (N2H4) at 80~100℃, which quickly removes oxygen-containing functional groups and restores the sp² carbon network, significantly improving electrical conductivity. It also has the advantages of low impurities, strong process compatibility and low cost. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the high-conductivity composite carbon fiber fabric structure based on the plant's mesh-like leaf veins, according to the present invention.

[0057] Figure 2 The present invention relates to a plant leaf vein-inspired tetrahedral pattern in the inner layer of a highly conductive composite carbon fiber fabric based on plant vein networks. The "tetrahedral pattern" refers to a digital pattern generated in textile design software to guide weaving.

[0058] Figure 3 This is the installation location of the highly conductive composite carbon fiber cloth based on plant reticulated leaf veins provided by the present invention.

[0059] Figure 4 This invention provides an installation method for highly conductive composite carbon fiber cloth based on plant reticulated leaf veins.

[0060] Figure 5 This is a photograph of the carbon fiber inner layer obtained in Example 1.

[0061] Figure 6 This is a photograph of the outer layer of graphene obtained in Example 1.

[0062] Figure 7 This is a photograph of the highly conductive composite carbon fiber cloth obtained in Example 1.

[0063] Among them, 1. Graphene outer layer, 2. Carbon fiber inner layer, 3. Bearing position, 4. Carbon fiber cloth position. Detailed Implementation

[0064] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

[0065] In one embodiment, the product is applied to a doubly-fed asynchronous wind turbine to suppress the damage caused by bearing electrolytic corrosion. Specifically, the highly conductive fabric is cut into an annular gasket and embedded in the mating surface between the bearing cover and the casing of the doubly-fed asynchronous wind turbine (installation position as shown in the image). Figure 3 As shown), static charge accumulated by electromagnetic induction during bearing operation is conducted to the housing grounding system through the low-resistance path of the fabric liner, preventing charge from discharging through the bearing raceway and causing electrolytic corrosion (installation method as shown). Figure 4 (As shown).

[0066] Example 1

[0067] A highly conductive composite carbon fiber cloth based on plant reticulated leaf veins includes the following steps:

[0068] Using carbon fiber, which has good conductivity and flexibility, as the yarn for the leaf vein section, a structure mimicking plant leaf veins is woven on a loom. Through composite processing, the leaf vein section achieves high conductivity. The leaf vein section forms the inner layer, while graphene fiber fabric, made from graphene, forms the outer layer. Finally, a hot-pressing process fuses the carbon fiber inner layer and the graphene outer layer to complete the fabric manufacturing process (its structural diagram is shown below). Figure 1 As shown in the figure, considering the high strength required for operation inside the doubly fed asynchronous wind turbine, an inner five-outer two stack is used for hot pressing, and a stepped heating method is adopted during the hot pressing process.

[0069] The preparation method of the carbon fiber inner layer specifically includes the following steps:

[0070] S1, Carbon fiber pretreatment: General T300 grade carbon fiber is immersed in 1 mol / L hydrochloric acid solution (solid-liquid mass ratio of 1:15) and ultrasonically treated for 30 minutes to remove surface impurities and increase surface active sites. Low-temperature plasma treatment is carried out under argon atmosphere (power 100W, time 5min) to introduce oxygen-containing functional groups to enhance the interfacial bonding with graphene.

[0071] S2, using the modified Hummers method: graphite powder and concentrated nitric acid (mass ratio 1:3) were stirred in an ice bath for 12 hours, and after centrifugation and washing, the mixture was dispersed in xylene and ultrasonically treated (frequency 50kHz, power 80W, time 20min) to obtain a highly dispersed GO solution.

[0072] S3, GO dispersion (concentration 2 mg / ml) and ethylenediamine (mass ratio 1:1.5) were hydrothermally reacted at 180℃ for 6 hours to obtain rGO dispersion. Pyridine (0.1 mol / L) was added as a dopant to improve the carrier mobility of rGO.

[0073] S4, Gradient Composite First Layer: Pretreated carbon fibers are immersed in GO solution (solid-liquid mass ratio 1:100), stirred at 60°C for 1 hour, and then ultrasonically impregnated (power 50W, time 2h). Vacuum drying at 50°C for 12 hours forms a GO coating layer with a thickness of about 200nm.

[0074] S5, Gradient Composite Second Layer: rGO is directionally deposited on the surface of the GO coating layer by electrophoretic deposition (voltage 5V, time 30min), and silver nanowires (diameter 30nm, aspect ratio >1000) are introduced as conductive bridges. The silver nanowires and rGO are mixed at a mass ratio of 1:10 to enhance the three-dimensional conductive network.

[0075] S6, the characteristics of plant reticulate leaf venation tissue are implanted into the inner layer and represented in the form of a quadrilateral diagram using simulation software (e.g.) Figure 2 As shown in the figure, the initial version of the carbon fiber inner layer is then woven on a loom.

[0076] S7 uses polyamide (PA) as the matrix, and composite fibers are laminated and stacked, and then hot-pressed to obtain a carbon fiber inner layer (such as...). Figure 5 As shown), the hot pressing parameters are: temperature 180℃, pressure 8MPa, and time 2 hours. Hot pressing achieves interfacial cross-linking.

[0077] The method for preparing the graphene outer layer includes the following steps:

[0078] (1) Preparation of graphene oxide short fibers: Graphene oxide (GO) was dispersed in N,N-dimethylformamide (DMF) to form a spinning solution (mass-volume ratio 1:35 g / ml) using wet spinning technology. The spinning solution was injected into an ethyl acetate coagulation bath using an injection pump. By adjusting the rotation speed of the coagulation bath (300 rpm) and the injection speed ratio (1:280), the fibers were controlled to break into short fibers (20-40 mm in length and 40-200 micrometers in diameter). The short fibers were collected by vacuum filtration and dried at 60°C for later use.

[0079] (2) Wet dispersion and interface fusion: GO short fibers are redispersed in an ethanol-water solution (ethanol and water volume ratio is 1:1), and a uniform suspension is formed by high-speed shearing and stirring. Dynamic filtration and deposition are performed using a 500-micron mesh. Solvent evaporation induces the self-assembly of π-π bonds between fibers to form a randomly overlapping GO fiber network (GOFF). In this process, the solvent polarity is adjusted by ethanol to inhibit the volume shrinkage caused by fiber swelling.

[0080] (3) High-temperature reduction and structural densification: Under an inert atmosphere (N2), GOFF is subjected to segmented gradient thermal annealing to reduce GO and achieve fiber interface fusion, densification, and graphitization. The temperature-time program is as follows (taking room temperature of 25℃ as an example, with a temperature control error ≤ ±2℃):

[0081] Heating section ①: Heating from room temperature 25℃ to 200℃ at a rate of 5℃ / min (heating time is 35 min); maintaining the temperature at 200℃ for 40 min to achieve dehydration and stabilization.

[0082] Heating stage ②: Heating from 200℃ to 500℃ at a rate of 3℃ / min (heating time is 100 min); holding at 500℃ for 90 min to achieve deep reduction.

[0083] Heating stage ③: Heating from 500℃ to 800℃ at a rate of 5℃ / min (heating time is 60 min); holding at 800℃ for 30 min to achieve high-temperature graphitization.

[0084] Heating stage ④: Heating from 800℃ to 1200℃ at a rate of 5℃ / min (heating time is 80 min); holding at 1200℃ for 40 min to achieve deep graphitization.

[0085] Cooling: The furnace was cooled to room temperature under an inert atmosphere (no faster than 5°C / min, and the actual curve was recorded).

[0086] To achieve GO reduction and fiber interface fusion, high-temperature treatment promotes the repair of graphene sheet defects, while graphitization enhances the mechanical interlocking between fibers, resulting in the acquisition of the graphene outer layer (such as...). Figure 6 (As shown).

[0087] The aforementioned carbon fiber inner layer and graphene outer layer are hot-pressed together to obtain a highly conductive composite carbon fiber cloth (such as...). Figure 7 (As shown).

[0088] Under the same test conditions (25℃, four-probe in-plane conductivity, and laser scintillation method in-plane thermal conductivity), the in-plane conductivity of a typical sample can reach (1.20±0.2)×10⁻⁶. 6 S / m, in-plane thermal conductivity is (9.0±1.0)×10 2 W·m -1 ·K -1 .

[0089] Example 2

[0090] A highly conductive composite carbon fiber cloth based on plant reticulated leaf veins includes the following steps:

[0091] Carbon fibers, known for their excellent conductivity and flexibility, are used as yarns for the leaf vein section, and a structure mimicking plant leaf veins is woven on a loom. Through composite processing, the leaf vein section achieves high conductivity. The leaf vein section forms the inner layer, while graphene fiber fabric, made from graphene, forms the outer layer. Finally, a hot-pressing process fuses the carbon fiber inner layer and the graphene outer layer to complete the fabric manufacturing. Considering the high strength required for operation inside a doubly-fed asynchronous wind turbine, a five-inner-two-outer stacking method is used for hot pressing, employing a stepped temperature increase method during the process.

[0092] The preparation method of the carbon fiber inner layer specifically includes the following steps:

[0093] S1, Carbon fiber pretreatment: High modulus M40J grade carbon fiber is immersed in 0.5mol / L hydrochloric acid solution (solid-liquid mass ratio of 1:15) and ultrasonically treated for 30 minutes to remove surface impurities and increase surface active sites. Low temperature plasma treatment is carried out in argon atmosphere (power 150W, time 5min) to introduce oxygen-containing functional groups to enhance the interfacial bonding with graphene.

[0094] S2, using the modified Hummers method: graphite powder and concentrated nitric acid (mass ratio 1:3) were stirred in an ice bath for 12 hours, and after centrifugation and washing, the mixture was dispersed in xylene and ultrasonically treated (frequency 50kHz, power 80W, time 20min) to obtain a highly dispersed GO solution.

[0095] S3, GO dispersion (concentration 2 mg / ml) and ethylenediamine (mass ratio 1:1.5) were hydrothermally reacted at 180℃ for 6 hours to obtain rGO dispersion. Pyridine (0.1 mol / L) was added as a dopant to improve the carrier mobility of rGO.

[0096] S4, Gradient Composite First Layer: Pretreated carbon fibers are immersed in GO solution (solid-liquid mass ratio 1:100), stirred at 60°C for 1 hour, and then ultrasonically impregnated (power 50W, time 2h). Vacuum drying at 50°C for 12 hours forms a GO coating layer with a thickness of about 200nm.

[0097] S5, Gradient Composite Second Layer: rGO is directionally deposited on the surface of the GO coating layer by electrophoretic deposition (voltage 5V, time 30min), and silver nanowires (diameter 30nm, aspect ratio >1000) are introduced as conductive bridges. The silver nanowires and rGO are mixed at a mass ratio of 1:10 to enhance the three-dimensional conductive network.

[0098] S6, the characteristics of plant reticulate leaf venation tissue are implanted into the inner layer and represented in the form of a quadrilateral diagram using simulation software (e.g.) Figure 2 As shown in the figure, the initial version of the carbon fiber inner layer is then woven on a loom.

[0099] S7 uses polyamide (PA) as the matrix, and composite fibers are laminated and stacked, and then hot-pressed to obtain the carbon fiber inner layer. The hot-pressing parameters are: temperature 180℃, pressure 8MPa, and time 2 hours. Hot pressing achieves interfacial cross-linking.

[0100] The method for preparing the graphene outer layer includes the following steps:

[0101] (1) Preparation of graphene oxide short fibers: Graphene oxide (GO) was dispersed in N,N-dimethylformamide (DMF) to form a spinning solution (mass-volume ratio 1:35 g / ml) using wet spinning technology. The spinning solution was injected into an ethyl acetate coagulation bath using an injection pump. By adjusting the rotation speed of the coagulation bath (300 rpm) and the injection speed ratio (1:280), the fibers were controlled to break into short fibers (20-40 mm in length and 40-200 micrometers in diameter). The short fibers were collected by vacuum filtration and dried at 60°C for later use.

[0102] (2) Wet dispersion and interface fusion: GO short fibers are redispersed in an ethanol-water solution (ethanol and water volume ratio is 1:1), and a uniform suspension is formed by high-speed shearing and stirring. Dynamic filtration and deposition are performed using a 500-micron mesh. Solvent evaporation induces the self-assembly of π-π bonds between fibers to form a randomly overlapping GO fiber network (GOFF). In this process, the solvent polarity is adjusted by ethanol to inhibit the volume shrinkage caused by fiber swelling.

[0103] (3) High-temperature reduction and structural densification: Under an inert atmosphere (N2), GOFF is subjected to segmented gradient thermal annealing to reduce GO and achieve fiber interface fusion, densification, and graphitization. The temperature-time program is as follows (taking room temperature of 25℃ as an example, with a temperature control error ≤ ±2℃):

[0104] Heating section ①: Heating from room temperature 25℃ to 200℃ at a rate of 5℃ / min (heating time is 35 min); maintaining the temperature at 200℃ for 40 min to achieve dehydration and stabilization.

[0105] Heating stage ②: Heating from 200℃ to 500℃ at a rate of 3℃ / min (heating time is 100 min); holding at 500℃ for 90 min to achieve deep reduction.

[0106] Heating stage ③: Heating from 500℃ to 800℃ at a rate of 5℃ / min (heating time is 60 min); holding at 800℃ for 30 min to achieve high-temperature graphitization.

[0107] Heating stage ④: Heating from 800℃ to 1200℃ at a rate of 5℃ / min (heating time is 80 min); holding at 1200℃ for 40 min to achieve deep graphitization.

[0108] Cooling: The furnace was cooled to room temperature under an inert atmosphere (no faster than 5°C / min, and the actual curve was recorded).

[0109] The process achieves GO reduction and fiber interface fusion, high-temperature treatment promotes the repair of graphene sheet defects, and graphitization enhances the mechanical interlocking between fibers to obtain the outer layer of graphene.

[0110] The aforementioned carbon fiber inner layer and graphene outer layer are hot-pressed together to obtain a highly conductive composite carbon fiber cloth.

[0111] Under the same test conditions (25℃, four-probe in-plane conductivity, and laser scintillation method in-plane thermal conductivity), the in-plane conductivity of a typical sample can reach (1.10±0.2)×10⁻⁶. 6 S / m, in-plane thermal conductivity is (8.5±1.0)×10 2 W·m -1 ·K -1 .

[0112] Example 3

[0113] A highly conductive composite carbon fiber cloth based on plant reticulated leaf veins includes the following steps:

[0114] Carbon fibers, known for their excellent conductivity and flexibility, are used as yarns for the leaf vein section, and a structure mimicking plant leaf veins is woven on a loom. Through composite processing, the leaf vein section achieves high conductivity. The leaf vein section forms the inner layer, while graphene fiber fabric, made from graphene, forms the outer layer. Finally, a hot-pressing process fuses the carbon fiber inner layer and the graphene outer layer to complete the fabric manufacturing. Considering the high strength required for operation inside a doubly-fed asynchronous wind turbine, a five-inner-two-outer stacking method is used for hot pressing, employing a stepped temperature increase method during the process.

[0115] The preparation method of the carbon fiber inner layer specifically includes the following steps:

[0116] S1, Carbon fiber pretreatment: High modulus M40J grade carbon fiber is immersed in 1 mol / L hydrochloric acid solution (solid-liquid mass ratio of 1:15) and ultrasonically treated for 30 minutes to remove surface impurities and increase surface active sites. Low temperature plasma treatment is carried out under argon atmosphere (power 100W, time 5min) to introduce oxygen-containing functional groups to enhance the interfacial bonding with graphene.

[0117] S2, using the modified Hummers method: graphite powder and concentrated nitric acid (mass ratio 1:3) were stirred in an ice bath for 12 hours, and after centrifugation and washing, the mixture was dispersed in xylene and ultrasonically treated (frequency 50kHz, power 80W, time 20min) to obtain a highly dispersed GO solution.

[0118] S3, GO dispersion (concentration 2 mg / ml) and ethylenediamine (mass ratio 1:1.5) were hydrothermally reacted at 180℃ for 6 hours to obtain rGO dispersion. Pyridine (0.1 mol / L) was added as a dopant to improve the carrier mobility of rGO.

[0119] S4, Gradient Composite First Layer: Pretreated carbon fibers are immersed in GO solution (solid-liquid mass ratio 1:100), stirred at 60°C for 1 hour, and then ultrasonically impregnated (power 50W, time 2h). Vacuum drying at 50°C for 12 hours forms a GO coating layer with a thickness of about 200nm.

[0120] S5, Gradient Composite Second Layer: rGO is directionally deposited on the surface of the GO coating layer by electrophoretic deposition (voltage 5V, time 30min), and silver nanowires (diameter 30nm, aspect ratio >1000) are introduced as conductive bridges. The silver nanowires and rGO are mixed at a mass ratio of 1:10 to enhance the three-dimensional conductive network.

[0121] S6, the characteristics of plant reticulate leaf venation tissue are implanted into the inner layer and represented in the form of a quadrilateral diagram using simulation software (e.g.) Figure 2 As shown in the figure, the initial version of the carbon fiber inner layer is then woven on a loom.

[0122] S7 uses polyamide (PA) as the matrix, and composite fibers are laminated and stacked, and then hot-pressed to obtain the carbon fiber inner layer. The hot-pressing parameters are: temperature 250℃, pressure 10MPa, and time 2 hours. Hot pressing achieves interfacial cross-linking.

[0123] The method for preparing the graphene outer layer includes the following steps:

[0124] (1) Preparation of graphene oxide short fibers: Graphene oxide (GO) was dispersed in N,N-dimethylformamide (DMF) to form a spinning solution (mass-volume ratio 1:35 g / ml) using wet spinning technology. The spinning solution was injected into an ethyl acetate coagulation bath using an injection pump. By adjusting the rotation speed of the coagulation bath (300 rpm) and the injection speed ratio (1:280), the fibers were controlled to break into short fibers (20-40 mm in length and 40-200 micrometers in diameter). The short fibers were collected by vacuum filtration and dried at 60°C for later use.

[0125] (2) Wet dispersion and interface fusion: GO short fibers are redispersed in an ethanol-water solution (ethanol and water volume ratio is 1:1), and a uniform suspension is formed by high-speed shearing and stirring. Dynamic filtration and deposition are performed using a 500-micron mesh. Solvent evaporation induces the self-assembly of π-π bonds between fibers to form a randomly overlapping GO fiber network (GOFF). In this process, the solvent polarity is adjusted by ethanol to inhibit the volume shrinkage caused by fiber swelling.

[0126] (3) High-temperature reduction and structural densification: Under an inert atmosphere (N2), GOFF is subjected to segmented gradient thermal annealing to reduce GO and achieve fiber interface fusion, densification, and graphitization. The temperature-time program is as follows (taking room temperature of 25℃ as an example, with a temperature control error ≤ ±2℃):

[0127] Heating section ①: Heating from room temperature 25℃ to 200℃ at a rate of 5℃ / min (heating time is 35 min); maintaining the temperature at 200℃ for 40 min to achieve dehydration and stabilization.

[0128] Heating stage ②: Heating from 200℃ to 500℃ at a rate of 3℃ / min (heating time is 100 min); holding at 500℃ for 90 min to achieve deep reduction.

[0129] Heating stage ③: Heating from 500℃ to 800℃ at a rate of 5℃ / min (heating time is 60 min); holding at 800℃ for 30 min to achieve high-temperature graphitization.

[0130] Heating stage ④: Heating from 800℃ to 1200℃ at a rate of 5℃ / min (heating time is 80 min); holding at 1200℃ for 40 min to achieve deep graphitization.

[0131] Cooling: The furnace was cooled to room temperature under an inert atmosphere (no faster than 5°C / min, and the actual curve was recorded).

[0132] Achieving GO reduction and fiber interface fusion: High-temperature treatment promotes the repair of graphene sheet defects, while graphitization enhances the mechanical interlocking between fibers to obtain the outer layer of graphene.

[0133] The aforementioned carbon fiber inner layer and graphene outer layer are hot-pressed together to obtain a highly conductive composite carbon fiber cloth.

[0134] Under the same test conditions (25℃, four-probe in-plane conductivity, and laser scintillation method for in-plane thermal conductivity), the in-plane conductivity of a typical sample is (1.25±0.15)×10⁻⁶. 6 S / m, in-plane thermal conductivity is (9.5±1.0)×10 2 W·m -1 ·K -1 .

[0135] Example 4

[0136] A highly conductive composite carbon fiber cloth based on plant reticulated leaf veins includes the following steps:

[0137] Carbon fibers, known for their excellent conductivity and flexibility, are used as yarns for the leaf vein section, and a structure mimicking plant leaf veins is woven on a loom. Through composite processing, the leaf vein section achieves high conductivity. The leaf vein section forms the inner layer, while graphene fiber fabric, made from graphene, forms the outer layer. Finally, a hot-pressing process fuses the carbon fiber inner layer and the graphene outer layer to complete the fabric manufacturing. Considering the high strength required for operation inside a doubly-fed asynchronous wind turbine, a five-inner-two-outer stacking method is used for hot pressing, employing a stepped temperature increase method during the process.

[0138] The method for preparing the carbon fiber inner layer specifically includes the following steps:

[0139] S1, Carbon fiber pretreatment: High modulus M40J grade carbon fiber is immersed in 1 mol / L hydrochloric acid solution (solid-liquid mass ratio of 1:15) and ultrasonically treated for 30 minutes to remove surface impurities and increase surface active sites. Low temperature plasma treatment is carried out under argon atmosphere (power 100W, time 5min) to introduce oxygen-containing functional groups to enhance the interfacial bonding with graphene.

[0140] S2, using the modified Hummers method: graphite powder and concentrated nitric acid (mass ratio 1:3) were stirred in an ice bath for 12 hours, and after centrifugation and washing, the mixture was dispersed in xylene and ultrasonically treated (frequency 50kHz, power 80W, time 20min) to obtain a highly dispersed GO solution.

[0141] S3, GO dispersion (concentration 2 mg / ml) and ethylenediamine (mass ratio 1:1.5) were hydrothermally reacted at 180℃ for 6 hours to obtain rGO dispersion. Pyridine (0.1 mol / L) was added as a dopant to improve the carrier mobility of rGO.

[0142] S4, Gradient Composite First Layer: Pretreated carbon fibers are immersed in GO solution (solid-liquid mass ratio 1:100), stirred at 60°C for 1 hour, and then ultrasonically impregnated (power 50W, time 2h). Vacuum drying at 50°C for 12 hours forms a GO coating layer with a thickness of about 200nm.

[0143] S5, Gradient Composite Second Layer: rGO is directionally deposited on the surface of the GO coating layer by electrophoretic deposition (voltage 5V, time 30min), and silver nanowires (diameter 30nm, aspect ratio >1000) are introduced as conductive bridges. The silver nanowires and rGO are mixed at a mass ratio of 1:10 to enhance the three-dimensional conductive network.

[0144] S6, the characteristics of plant reticulate leaf venation tissue are implanted into the inner layer and represented in the form of a quadrilateral diagram using simulation software (e.g.) Figure 2 As shown in the figure, the initial version of the carbon fiber inner layer is then woven on a loom.

[0145] S7 uses polyamide (PA) as the matrix, and composite fibers are laminated and stacked, and then hot-pressed to obtain the carbon fiber inner layer. The hot-pressing parameters are: temperature 180℃, pressure 8MPa, and time 2 hours. Hot pressing achieves interfacial cross-linking.

[0146] The method for preparing the graphene outer layer includes the following steps:

[0147] (1) Preparation of graphene oxide short fibers: Graphene oxide (GO) was dispersed in N,N-dimethylformamide (DMF) to form a spinning solution (mass-volume ratio 1:35 g / ml) using wet spinning technology. The spinning solution was injected into an ethyl acetate coagulation bath using an injection pump. By adjusting the rotation speed of the coagulation bath (300 rpm) and the injection speed ratio (1:280), the fibers were broken into short fibers (about 50 mm in length and 100-300 micrometers in diameter). The short fibers were collected by vacuum filtration and dried at 60°C for later use.

[0148] (2) Wet dispersion and interface fusion: GO short fibers are redispersed in an ethanol-water solution (ethanol and water volume ratio is 1:1), and a uniform suspension is formed by high-speed shearing and stirring. Dynamic filtration and deposition are performed using a 500-micron mesh. Solvent evaporation induces the self-assembly of π-π bonds between fibers to form a randomly overlapping GO fiber network (GOFF). In this process, the solvent polarity is adjusted by ethanol to inhibit the volume shrinkage caused by fiber swelling.

[0149] (3) High-temperature reduction and structural densification: Under an inert atmosphere (N2), GOFF is subjected to segmented gradient thermal annealing to reduce GO and achieve fiber interface fusion, densification, and graphitization. The temperature-time program is as follows (taking room temperature of 25℃ as an example, with a temperature control error ≤ ±2℃):

[0150] Heating section ①: Heating from room temperature 25℃ to 200℃ at a rate of 5℃ / min (heating time is 35 min); maintaining the temperature at 200℃ for 40 min to achieve dehydration and stabilization.

[0151] Heating stage ②: Heating from 200℃ to 500℃ at a rate of 3℃ / min (heating time is 100 min); holding at 500℃ for 90 min to achieve deep reduction.

[0152] Heating stage ③: Heating from 500℃ to 800℃ at a rate of 5℃ / min (heating time is 60 min); holding at 800℃ for 30 min to achieve high-temperature graphitization.

[0153] Heating stage ④: Heating from 800℃ to 1200℃ at a rate of 5℃ / min (heating time is 80 min); holding at 1200℃ for 40 min to achieve deep graphitization.

[0154] Cooling: The furnace was cooled to room temperature under an inert atmosphere (no faster than 5°C / min, and the actual curve was recorded).

[0155] Achieving GO reduction and fiber interface fusion: High-temperature treatment promotes the repair of graphene sheet defects, while graphitization enhances the mechanical interlocking between fibers to obtain the outer layer of graphene.

[0156] The aforementioned carbon fiber inner layer and graphene outer layer are hot-pressed together to obtain a highly conductive composite carbon fiber cloth.

[0157] Under the same test conditions (25℃, four-probe in-plane conductivity, laser scintillation method in-plane thermal conductivity), the in-plane conductivity of a typical sample can reach (1.00±0.20)×10⁻⁶. 6 S / m, in-plane thermal conductivity is (9.5±1.0)×10 2 W·m -1 ·K -1 .

[0158] Example 5

[0159] A highly conductive composite carbon fiber cloth based on plant reticulated leaf veins includes the following steps:

[0160] Carbon fibers, known for their excellent conductivity and flexibility, are used as yarns for the leaf vein section, and a structure mimicking plant leaf veins is woven on a loom. Through composite processing, the leaf vein section achieves high conductivity. The leaf vein section forms the inner layer, while graphene fiber fabric, made from graphene, forms the outer layer. Finally, a hot-pressing process fuses the carbon fiber inner layer and the graphene outer layer to complete the fabric manufacturing. Considering the high strength required for operation inside a doubly-fed asynchronous wind turbine, a five-inner-two-outer stacking method is used for hot pressing, employing a stepped temperature increase method during the process.

[0161] The method for preparing the carbon fiber inner layer specifically includes the following steps:

[0162] S1, Carbon fiber pretreatment: High modulus M40J grade carbon fiber is immersed in 1 mol / L hydrochloric acid solution (solid-liquid mass ratio of 1:15) and ultrasonically treated for 30 minutes to remove surface impurities and increase surface active sites. Low temperature plasma treatment is carried out under argon atmosphere (power 100W, time 5min) to introduce oxygen-containing functional groups to enhance the interfacial bonding with graphene.

[0163] S2, using the modified Hummers method: graphite powder and concentrated nitric acid (mass ratio 1:3) were stirred in an ice bath for 12 hours, and after centrifugation and washing, the mixture was dispersed in xylene and ultrasonically treated (frequency 50kHz, power 80W, time 20min) to obtain a highly dispersed GO solution.

[0164] S3, GO dispersion (concentration 2 mg / ml) and ethylenediamine (mass ratio 1:1.5) were hydrothermally reacted at 180℃ for 6 hours to obtain rGO dispersion. Pyridine (0.1 mol / L) was added as a dopant to improve the carrier mobility of rGO.

[0165] S4, Gradient Composite First Layer: Pretreated carbon fibers are immersed in GO solution (solid-liquid mass ratio 1:100), stirred at 60°C for 1 hour, and then ultrasonically impregnated (power 50W, time 2h). Vacuum drying at 50°C for 12 hours forms a GO coating layer with a thickness of about 200nm.

[0166] S5, Gradient Composite Second Layer: rGO is directionally deposited on the surface of the GO coating layer by electrophoretic deposition (voltage 5V, time 30min), and silver nanowires (diameter 30nm, aspect ratio >1000) are introduced as conductive bridges. The silver nanowires and rGO are mixed at a mass ratio of 1:10 to enhance the three-dimensional conductive network.

[0167] S6, the characteristics of plant reticulate leaf venation tissue are implanted into the inner layer and represented in the form of a quadrilateral diagram using simulation software (e.g.) Figure 2 As shown in the figure, the initial version of the carbon fiber inner layer is then woven on a loom.

[0168] S7 uses polyamide (PA) as the matrix, and composite fibers are laminated and stacked, and then hot-pressed to obtain the carbon fiber inner layer. The hot-pressing parameters are: temperature 180℃, pressure 8MPa, and time 2 hours. Hot pressing achieves interfacial cross-linking.

[0169] The method for preparing the graphene outer layer includes the following steps:

[0170] (1) Preparation of graphene oxide short fibers: Graphene oxide (GO) was dispersed in N,N-dimethylformamide (DMF) to form a spinning solution (mass-volume ratio 1:35 g / ml) using wet spinning technology. The spinning solution was injected into an ethyl acetate coagulation bath using an injection pump. By adjusting the rotation speed of the coagulation bath (300 rpm) and the injection speed ratio (1:280), the fibers were controlled to break into short fibers (20-40 mm in length and 40-200 micrometers in diameter). The short fibers were collected by vacuum filtration and dried at 60°C for later use.

[0171] (2) Wet dispersion and interface fusion: GO short fibers were redispersed in an ethanol-water solution (ethanol to water volume ratio of 1:1), and a uniform suspension was formed by high-speed shearing and stirring. Dynamic filtration and deposition were performed using a 500-micron mesh. Solvent evaporation was used to induce the self-assembly of π-π bonds between fibers to form a randomly overlapping GO fiber network (GOFF). In this process, the solvent polarity was adjusted by ethanol to inhibit the volume shrinkage caused by fiber swelling. Considering the presence of lubricating oil in the working environment of the doubly fed asynchronous wind turbine, a 0.05 mm polytetrafluoroethylene microporous layer (contact angle > 150°, to prevent oil penetration) was coated on the surface of the GO fiber network.

[0172] (3) High-temperature reduction and structural densification: Under an inert atmosphere (N2), GOFF is subjected to segmented gradient thermal annealing to reduce GO and achieve fiber interface fusion, densification, and graphitization. The temperature-time program is as follows (taking room temperature of 25℃ as an example, with a temperature control error ≤ ±2℃):

[0173] Heating section ①: Heating from room temperature 25℃ to 200℃ at a rate of 5℃ / min (heating time is 35 min); maintaining the temperature at 200℃ for 40 min to achieve dehydration and stabilization.

[0174] Heating stage ②: Heating from 200℃ to 500℃ at a rate of 3℃ / min (heating time is 100 min); holding at 500℃ for 90 min to achieve deep reduction.

[0175] Heating stage ③: Heating from 500℃ to 800℃ at a rate of 5℃ / min (heating time is 60 min); holding at 800℃ for 30 min to achieve high-temperature graphitization.

[0176] Heating stage ④: Heating from 800℃ to 1200℃ at a rate of 5℃ / min (heating time is 80 min); holding at 1200℃ for 40 min to achieve deep graphitization.

[0177] Cooling: The furnace was cooled to room temperature under an inert atmosphere (no faster than 5°C / min, and the actual curve was recorded).

[0178] Achieving GO reduction and fiber interface fusion: High-temperature treatment promotes the repair of graphene sheet defects, while graphitization enhances the mechanical interlocking between fibers to obtain the outer layer of graphene.

[0179] The aforementioned carbon fiber inner layer and graphene outer layer are hot-pressed together to obtain a highly conductive composite carbon fiber cloth.

[0180] Under the same test conditions (25℃, four-probe in-plane conductivity, and laser scintillation method in-plane thermal conductivity), the in-plane conductivity of a typical sample can reach (1.05±0.15)×10⁻⁶. 6 S / m, in-plane thermal conductivity is (7.8±0.8)×10 2 W·m -1 ·K -1 .

Claims

1. A highly conductive composite carbon fiber cloth based on plant reticulated leaf veins, characterized in that, include: Carbon fiber inner layer: carbon fiber matrix with a hierarchical conductive network that mimics plant leaf veins; Graphene outer layer: Graphene fibers randomly interlocked to form a conductive network; The inner carbon fiber layer and the outer graphene layer are hot-pressed together to form a highly conductive composite carbon fiber cloth with a synergistic conductive structure. The plant-like leaf vein hierarchical conductive network includes a main vein, primary branches, and secondary branches. The main vein is connected to an external power input terminal and transmits electrical signals to the primary branches. The primary branches extend to the functional area and distribute electrical signals to the secondary branches. The secondary branches are arranged in parallel, and adjacent secondary branches are connected by an electronically controlled switch module.

2. The highly conductive composite carbon fiber cloth based on plant reticulated leaf veins according to claim 1, characterized in that, The main vein is ≥2 mm wide, the first-order branch veins are 0.5-1 mm wide, and the second-order branch veins are 0.1-0.3 mm wide.

3. The highly conductive composite carbon fiber cloth based on plant reticulated leaf veins according to claim 1, characterized in that, The secondary branch is equipped with a fault-tolerant control circuit, including a current sensor and a comparator. The current sensor monitors the on / off status of the branch in real time. When the current value of the current branch is detected to be lower than the threshold, the comparator triggers the field-effect transistor switch of the adjacent branch to turn on.

4. The method for preparing the highly conductive composite carbon fiber cloth according to any one of claims 1 to 3, characterized in that, The carbon fiber inner layer and the graphene outer layer are fused together by a hot-pressing process to form a structure in which the carbon fiber inner layer is sandwiched between two graphene outer layers on each side. The carbon fiber inner layer has 5 to 10 layers, and the graphene outer layer on each side has 1 to 3 layers.

5. The preparation method according to claim 4, characterized in that, The method for preparing the carbon fiber inner layer includes the following steps: S1. Carbon fiber is subjected to ultrasonic treatment with hydrochloric acid solution and low-temperature plasma activation; S2. Gradient composite GO coating layer and rGO conductive layer; S3. Silver nanowires are doped into the rGO conductive layer, with a mass ratio of silver nanowires to rGO of 1:8~15; S4. The pattern of imitation plant leaf veins is woven into shape and then cured by hot pressing with polyamide lamination.

6. The preparation method according to claim 4, characterized in that, The method for preparing the graphene outer layer includes the following steps: Step 1: Wet spinning of GO short fibers, controlling the length to 20-50 mm and the diameter to 40-300 micrometers; Step 2: Self-assemble in an ethanol-water solution to form a randomly overlapping GO fiber network; Step 3: Gradient annealing in an inert atmosphere to achieve interface fusion.

7. The preparation method according to claim 6, characterized in that, It also includes a GO fiber network surface coated with a polytetrafluoroethylene microporous layer, the thickness of which is 0.04~0.07 mm and the contact angle is >150°.

8. An application characterized in that, The high conductivity composite carbon fiber cloth according to any one of claims 1 to 3 or the high conductivity composite carbon fiber cloth obtained by the preparation method according to any one of claims 4 to 7 is applied to a doubly-fed asynchronous wind turbine.

9. The application according to claim 8, characterized in that, The specific method of the application is as follows: cut the highly conductive composite carbon fiber cloth into a ring-shaped pad and embed it into the joint surface between the bearing cover and the housing of the doubly fed asynchronous wind turbine generator.

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