Preparation method of conductive binder for solid-state battery electrode

Abstract

The invention provides a preparation method of a conductive binder for a solid-state battery electrode, which is characterized by comprising the following steps: S1, dissolving a conductive agent in an organic solvent to prepare a solution; s2, adding a polymer binder into the solution in the step S1, stirring and dispersing to prepare an electrostatic spinning solution; s3, preparing conductive nanofibers from the electrostatic spinning solution prepared in the step S2 by adopting an airflow-assisted electrostatic spinning process; and S4, carrying out heat treatment on the conductive nanofiber prepared in the step S3, and then grinding and dispersing to obtain the conductive binder. The conductive material is added into the polymer binder, the nanofiber-state conductive binder is directly prepared through the airflow-assisted electrostatic spinning process, when the conductive binder is applied to a solid-state battery electrode, space transmission channels are enriched through conductive nanofibers of the conductive binder, a transmission path is shortened, and the energy storage performance of the battery is enhanced; and high-rate and high-capacity electricity storage is realized.

Description

Technical Field

[0001] The present invention relates to the field of manufacturing battery materials, and in particular to a method for preparing a conductive adhesive for solid-state battery electrodes. Background Art

[0002] With the rapid development of electric vehicles and smart grids, it has become difficult to simultaneously improve the safety and energy density of traditional lithium-ion batteries. Thanks to the high chemical and electrochemical stability, thermal stability, and mechanical strength of solid electrolytes, all-solid-state lithium batteries have become a key development focus for new electrochemical energy storage devices, balancing high energy density with high safety.

[0003] The interface between solid electrolytes and electrodes has become a core challenge in the development of the solid-state battery industry, urgently requiring innovations in material systems and manufacturing methods. In recent years, the rapid development of sulfide solid electrolytes has partially addressed the drawback of insufficient intrinsic conductivity in solid-state batteries. The electrode sheets in solid-state batteries assembled with sulfide solid electrolytes are typically fabricated using either wet or dry coating techniques. Dry coating offers significant advantages, as it eliminates the need to consider solvent emissions and recovery after scale-up. The binder used in dry coating is typically e-PTFE powder, which is mixed with the electrode material, fiberized by high-speed stirring, thoroughly mixed with the electrode material, and then pressed into a membrane. The fibrous e-PTFE acts as a binder, thereby improving the mechanical properties of the powder. However, due to the poor conductivity of e-PTFE, it can create significant internal resistance in the electrode sheet and can easily lead to crystallization at the interface of the e-PTFE material, compromising battery safety and lifespan. Therefore, the industry has adopted the method of coating e-PTFE with a conductive agent to enhance the conductivity of e-PTFE fibers, but this method is complex and costly.

[0004] Patent CN202410268741.1 discloses a dry-process sheet-making process for the positive electrode of a sodium-ion battery, which prepares the positive electrode sheet by mixing a positive electrode material, a conductive agent and a binder, wherein the binder is prepared into nanofibers by electrostatic spinning. This patent uses an electrostatic spinning nozzle directly on the mixer, spraying electrostatically spun nanofibers while stirring, and mixing the nanofibers into the powder material. The nanofibers prepared by this patent and the e-PTFE used in the traditional method cannot solve the problem of the conductivity of the binder fiber, and it is still necessary to add a conductive agent material when mixing with the electrode material. Moreover, this patent only simplifies the performance of the stirring equipment, but the production efficiency of electrostatic spinning is low. The nozzle is directly installed on the stirring equipment, and the production efficiency is low, which is not conducive to large-scale production.

[0005] Therefore, a new method for manufacturing electrode materials is urgently needed to solve the above technical problems. Summary of the Invention

[0006] The main purpose of the present invention is to propose a method for preparing a conductive adhesive for solid-state battery electrodes. The prepared conductive adhesive can improve the interface performance between solid-state battery electrodes and electrolytes, thereby improving the efficiency of electron and ion transmission.

[0007] To achieve the above object, the present invention provides a method for preparing a conductive adhesive for solid-state battery electrodes, characterized in that: S1. dissolving a conductive agent in an organic solvent to prepare a solution; S2, adding a polymer binder to the solution in step S1, stirring and dispersing, and preparing an electrospinning solution; S3, preparing conductive nanofibers by using the electrospinning solution prepared in step S2 through an airflow-assisted electrospinning process; S4. Heat-treating the conductive nanofibers obtained in step S3, and then grinding and dispersing them to obtain the conductive adhesive.

[0008] The present invention adds a conductive material to a polymer binder and prepares a conductive binder in a nanofiber state. When applied to solid-state battery electrodes, the amount of binder used can be increased and the internal resistance of the material can be reduced. The conductive nanofibers of the conductive binder are used to enrich the spatial transmission channels and shorten the transmission path to enhance the battery energy storage performance and achieve high-rate and high-capacity power storage.

[0009] Preferably, the conductive agent is at least one of carbon nanotubes, nanographite and graphene.

[0010] Preferably, the polymer binder is at least one of polyvinylidene fluoride (FVDF) and polyacrylonitrile (PAN).

[0011] Preferably, the organic solvent is dimethylformamide (DMF) or dimethylacetamide (DMAC).

[0012] Preferably, the mass ratio of the conductive agent to the polymer binder is 80-99.9:10-20.

[0013] Preferably, in step S2, the solid content of the electrospinning solution is 1-20%.

[0014] Preferably, in step S3, the airflow-assisted electrospinning process parameters are: positive electrode voltage is 15~30kV, negative electrode voltage is -3~-0.5kV, liquid supply rate of the nozzle is 1~10mL / hr, auxiliary airflow flow rate is 10~50L / min, the distance from the nozzle to the collecting plate is 10~15cm, the ambient temperature is 20~30℃, and the ambient humidity is <55%.

[0015] Preferably, in step S4, the average particle size of the conductive adhesive is less than 1 mm.

[0016] Preferably, in step S4, the grinding and dispersion is performed by dry grinding, comprising the following steps: placing a predetermined amount of the conductive nanofibers into a reaction vessel for grinding at a rotation speed of 3000 r / min and a grinding time of 5 min, and sieving to obtain the conductive adhesive.

[0017] Preferably, in step S4, the grinding and dispersion is performed using a water milling method, comprising the following steps: adding a predetermined amount of the conductive nanofibers and deionized water to a reaction kettle, and grinding at successively increasing speeds: (a) 2000 r / min for 30 minutes, (b) 4000 r / min for 30 minutes, and (c) 6000 r / min for 60 minutes. The ground conductive nanofibers are then drained and dried at 60°C for 60 minutes, and then further dried at 80°C for 60 minutes, thereby obtaining the conductive adhesive.

[0018] Compared to existing technologies, this invention offers at least the following advantages: It breaks through technical barriers by directly mixing a conductive agent and a polymer binder to form an electrospinning solution. Using an airflow-assisted electrospinning process, it successfully collects and obtains a dispersed conductive nanofiber binder with a controllable morphology and structure, enabling its application in solid-state battery electrodes and helping to improve the energy storage performance of solid-state batteries. The conductive binder preparation method provided by this invention boasts high production efficiency and stable performance, meeting the needs of mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is an electron microscope image (2 μm) of the conductive nanofibers obtained in step S3 of Example 1; Figure 2 : This is an electron microscope image (10 μm) of the conductive adhesive obtained in Example 1; Figure 3 : This is an electron microscope image (10 μm) of the conductive adhesive obtained in Example 2; Figure 4 : This is an electron microscope image of the conductive adhesive obtained in Example 2 (200 nm); Figure 5 This is a physical picture of the powdered conductive adhesive obtained in Example 1; Figure 6 This is a physical picture of the powdered conductive adhesive obtained in Example 2; Figure 7 This is an electron microscope image (1 μm) of the conductive nanofibers obtained in step S3 of Comparative Example 1; Figure 8 : This is an electron microscope image (2 μm) of the conductive adhesive obtained in Comparative Example 1; Figure 9 This is an electron microscope image (20 μm) of the conductive nanofibers obtained in step S3 of Comparative Example 2; Figure 10 This is an electron microscope image (10 μm) of the conductive nanofibers obtained in step S3 of Comparative Example 3.

[0021] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other unless there is a conflict. At the same time, the raw materials mentioned below that are not described in detail are all commercially available products; the process steps or preparation methods not mentioned in detail are all process steps or preparation methods known to those skilled in the art.

[0023] The present invention discloses a method for preparing a conductive adhesive for solid-state battery electrodes, which is characterized by: S1. Dissolving a conductive agent in an organic solvent to form a solution; wherein the conductive agent may be at least one of carbon nanotubes, nanographite, and graphene. The organic solvent may be dimethylformamide or dimethylacetamide; S2. Adding a polymer binder to the solution of step S1, stirring and dispersing the mixture to form an electrospinning solution; wherein the polymer binder can be at least one of polyvinylidene fluoride and polyacrylonitrile. The mass ratio of the conductive agent to the polymer binder is 80-99.9:10-20; S3, preparing conductive nanofibers by using the electrospinning solution prepared in step S2 through an airflow-assisted electrospinning process; S4. Heat-treating the conductive nanofibers obtained in step S3, and then grinding and dispersing them to obtain the conductive adhesive.

[0024] Specifically, the preparation process of steps S1 and S2 includes: repeatedly adding a conductive agent in small amounts to a weighed organic solvent and stirring for 5 minutes, then repeatedly adding a polymer binder in small amounts and stirring in a sealed container for at least 12 hours to obtain a uniform electrospinning solution. The solid content of the electrospinning solution is controlled to be 1-20%.

[0025] In step S3, the parameters of the airflow-assisted electrospinning process are as follows: the positive electrode electrostatic voltage is 15 to 30 kV, the negative electrode electrostatic voltage is -3 to -0.5 kV, the liquid supply rate of the nozzle is 1 to 10 mL / hr, the auxiliary airflow flow rate is 10 to 50 L / min, the distance from the nozzle to the collecting plate is 10 to 15 cm, the ambient temperature is 20 to 30 ° C, and the ambient humidity is <55%.

[0026] It should be noted that directly mixing the conductive agent and the polymer binder to prepare the electrospinning solution increases the conductivity and makes it more difficult to produce the wire due to the presence of the conductive agent material. Accordingly, it is necessary to reduce the solution concentration. However, the reduced concentration will cause the electrospun nanofibers to be deposited on the collecting plate and then cannot be completely cured and dried, resulting in increased difficulty in collecting the nanofibers, and easily causing agglomeration and knotting. The material is unevenly distributed, which is not conducive to subsequent dispersion, thereby affecting product quality. However, the conductive binder used in solid-state battery electrodes has high requirements for the morphology of the nanofibers. How to efficiently prepare high-quality conductive nanofibers is one of the technical difficulties of the present invention. The present invention adopts an airflow-assisted electrospinning process, which accurately controls the temperature and humidity of the spinning process and utilizes auxiliary airflow as conduction to avoid the electrospun conductive nanofibers from being directly deposited. This overcomes the problem that the conductive nanofibers are difficult to disperse by clumping together, increases the flight time of the conductive nanofibers in the air, and promotes the volatilization of the solvent. At the same time, the suspended conductive nanofibers are easy to shrink to form a bead chain structure, and the purpose of releasing the charge is achieved by changing the flight trajectory of the conductive nanofibers, which is more conducive to the collection of high-quality finished conductive nanofibers. By precisely controlling the above-mentioned process parameters, bead-chain-shaped conductive nanofibers can be obtained, the conductive material can be wrapped in the nanofibers, and good conductivity can be provided.

[0027] In step S4, the conductive nanofibers can be ground and dispersed using either dry grinding or water grinding. Dry grinding and dispersion include placing a predetermined amount of conductive nanofibers in a reactor and grinding them (at 3000 rpm for 5 minutes), repeatedly grinding and sieving the conductive fiber particles to obtain a powdered conductive binder with a particle size of less than 1 mm. Water grinding and dispersion include adding a predetermined amount of conductive nanofibers and deionized water to a reactor and increasing the speed of grinding in sequence: (a) grinding at 2000 rpm for 30 minutes, (b) grinding at 4000 rpm for 30 minutes, and (c) grinding at 6000 rpm for 60 minutes. The ground conductive nanofibers are then drained and dried, dried at 60°C for 60 minutes, and then dried at 80°C for 60 minutes, to obtain a powdered conductive binder with a particle size of less than 1 mm.

[0028] The following examples are further listed to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the scope of protection of the present invention. The specific process parameters of the following examples are also only examples within a suitable range, that is, those skilled in the art can make selections within a suitable range through the description herein, and are not intended to be limited to the specific numerical values ​​of the examples below. For those in the examples where specific conditions are not specified, proceed according to conventional conditions or the conditions recommended by the manufacturer.

[0029] Example 1 A method for preparing a conductive adhesive for solid-state battery electrodes, characterized in that: S1. Add 5‰ graphite to 94.5% DMF in small amounts several times according to the formula ratio, stir for 5 minutes until dissolved, and prepare a solution; S2. Add 4% PVDF to the solution in step S1, seal and stir for more than 12 hours to prepare an electrospinning solution; S3. Using the electrospinning solution prepared in step S2, conductive nanofibers are prepared using an airflow-assisted electrospinning process; wherein the airflow-assisted electrospinning process parameters are: a positive voltage of 15 kV, a negative voltage of -1.3 kV, and a liquid supply rate of 4 mL / hr to the nozzle; the release paper is fixed on a collection roll and the rotation rate is set to 2 r / min and the collection distance is 15 cm; the spinning environment parameters are controlled as follows: temperature <30°C, humidity <55%, and the auxiliary airflow pressure is set to 0.2 MPa to ensure an airflow rate of 20 L / min; S4. The conductive nanofibers produced in step S3 are dried multiple times (60 minutes at 60°C) until the weight of the conductive nanofibers no longer decreases. A water mill is used for dispersion: a predetermined amount of conductive nanofibers and deionized water are placed in a reaction kettle and the speed of grinding is increased sequentially: (a) 2000 r / min for 30 minutes, (b) 4000 r / min for 30 minutes, and (c) 6000 r / min for 60 minutes. The ground conductive nanofibers are then drained and dried at 60°C for 60 minutes, followed by drying at 80°C for 60 minutes to obtain a powdered conductive binder with a particle size of less than 1 mm.

[0030] Example 2 A method for preparing a conductive adhesive for solid-state battery electrodes, characterized in that: S1. Add 5‰ graphite to 94.5% DMF in small amounts several times according to the formula ratio, stir for 5 minutes until dissolved, and prepare a solution; S2. Add 4% PVDF to the solution in step S1, seal and stir for more than 12 hours to prepare an electrospinning solution; S3. Using the electrospinning solution prepared in step S2, conductive nanofibers are prepared using an airflow-assisted electrospinning process; wherein the airflow-assisted electrospinning process parameters are: a positive voltage of 15 kV, a negative voltage of -1.3 kV, and a liquid supply rate of 4 mL / hr to the nozzle; the release paper is fixed on a collection roll and the rotation rate is set to 2 r / min and the collection distance is 15 cm; the spinning environment parameters are controlled as follows: temperature <30°C, humidity <55%, and the auxiliary airflow pressure is set to 0.2 MPa to ensure an airflow rate of 20 L / min; S4. The conductive nanofibers prepared in step S3 are dried multiple times (at 60°C for 60 minutes) until the weight of the conductive nanofibers no longer decreases. Dry grinding and dispersion are performed by placing a predetermined amount of conductive nanofibers in a reaction vessel and grinding them (at 3000 rpm for 5 minutes). The conductive fiber particles are repeatedly ground and sieved to obtain a powdered conductive binder with a particle size of less than 1 mm.

[0031] Comparative Example 1 The electrospinning process in this comparative example adopts a conventional electrospinning process without auxiliary airflow. Specifically: A method for preparing a conductive adhesive for solid-state battery electrodes, characterized in that: S1. Add 5‰ graphite to 94.5% DMF in small amounts several times according to the formula ratio, stir for 5 minutes until dissolved, and prepare a solution; S2. Add 4% PVDF to the solution in step S1, seal and stir for more than 12 hours to prepare an electrospinning solution; S3. Using the electrospinning solution prepared in step S2, conductive nanofibers are prepared using an airflow-assisted electrospinning process; the airflow-assisted electrospinning process parameters are as follows: a positive voltage of 15 kV, a negative voltage of -1.3 kV, and a liquid supply rate of 4 mL / hr to the nozzle; the release paper is fixed on a collection roll and set to a rotation rate of 2 r / min and a collection distance of 15 cm; the spinning environment parameters are controlled as follows: temperature <30° C., and humidity <55%; S4. The conductive nanofibers produced in step S3 are dried multiple times (60 minutes at 60°C) until the weight of the conductive nanofibers no longer decreases. A water mill is used for dispersion: a predetermined amount of conductive nanofibers and deionized water are placed in a reaction kettle and the speed of grinding is increased sequentially: (a) 2000 r / min for 30 minutes, (b) 4000 r / min for 30 minutes, and (c) 6000 r / min for 60 minutes. The ground conductive nanofibers are then drained and dried at 60°C for 60 minutes, followed by drying at 80°C for 60 minutes to obtain a powdered conductive binder with a particle size of less than 1 mm.

[0032] Comparative Example 2 A method for preparing a conductive adhesive for solid-state battery electrodes, characterized in that: S1. Add 5‰ graphite to 94.5% DMF in small amounts several times according to the formula ratio, stir for 5 minutes until dissolved, and prepare a solution; S2. Add 4% PVDF to the solution in step S1, seal and stir for more than 12 hours to prepare an electrospinning solution; S3. Using the electrospinning solution prepared in step S2, conductive nanofibers are prepared using an airflow-assisted electrospinning process; wherein the airflow-assisted electrospinning process parameters are: a positive voltage of 15 kV, a negative voltage of -1.3 kV, and a liquid supply rate of 4 mL / hr to the nozzle; fixing the release paper on a collection roll and setting the rotation rate to 2 r / min and the collection distance to 15 cm; controlling the spinning environment parameters: temperature of 40° C., humidity <55%, and setting the auxiliary airflow pressure to 0.2 MPa to ensure an airflow rate of 20 L / min; S4. The conductive nanofibers produced in step S3 were dried multiple times (60°C, 60 min) until the weight of the conductive nanofibers ceased to decrease. Grinding was performed using the same water milling method as in Example 1 and the same dry milling method as in Example 2, but both failed to disperse the conductive nanofibers, and no powdered conductive adhesive was obtained.

[0033] Comparative Example 3 A method for preparing a conductive adhesive for solid-state battery electrodes, characterized in that: S1. Add 5‰ graphite to 94.5% DMF in small amounts several times according to the formula ratio, stir for 5 minutes until dissolved, and prepare a solution; S2. Add 4% PVDF to the solution in step S1, seal and stir for more than 12 hours to prepare an electrospinning solution; S3. Using the electrospinning solution prepared in step S2, conductive nanofibers are prepared using an airflow-assisted electrospinning process; wherein the airflow-assisted electrospinning process parameters are: a positive voltage of 15 kV, a negative voltage of -1.3 kV, and a liquid supply rate of 4 mL / hr to the nozzle; fixing the release paper on a collection roll and setting the rotation rate to 2 r / min and the collection distance to 15 cm; controlling the spinning environment parameters: temperature <35°C, humidity 65%, and setting the auxiliary airflow pressure to 0.2 MPa to ensure an airflow rate of 20 L / min; S4. The conductive nanofibers produced in step S3 were dried multiple times (60°C, 60 min) until the weight of the conductive nanofibers ceased to decrease. Grinding was performed using the same water milling method as in Example 1 and the same dry milling method as in Example 2, but both failed to disperse the conductive nanofibers, and no powdered conductive adhesive was obtained.

[0034] The square resistance of the conductive nanofibers obtained in step S3 of Examples 1-2 and Comparative Examples 1-3 was detected. The testing method included pressing the conductive nanofibers into sheets with an applied pressure of 10 MPa, and detecting the square resistance of the conductive nanofibers after pressing. The test results are shown in Table 1.

[0035] Table 1 The sheet resistance of the conductive adhesives in Examples 1-2 and Comparative Example 1 was measured (Note: Since powdered conductive adhesives were unavailable for Comparative Examples 2 and 3, no test data is available). The testing method involved pressing the powdered conductive adhesive into a tablet at a pressure of 10 MPa and measuring the sheet resistance of the tableted conductive adhesive. The test results are shown in Table 2.

[0036] Table 2 like Figure 1 As shown in the figure, the conductive nanofibers prepared in Example 1 are in the shape of beads. The nanofibers can form a good three-dimensional coating on the conductive material. After water milling, the conductive nanofibers are obtained as shown in the figure. Figure 2 and Figure 5 As shown in the conductive adhesive. Figure 3 and Figure 4 As shown, the conductive adhesive nanofibers prepared in Example 2 are evenly dispersed and have the best fiber morphology. Figure 6This is a photo of a conductive adhesive produced by dry grinding. Tables 1 and 2 show that the sheet resistance of the conductive nanofibers is 50-58 kΩ / □. The sheet resistance of the conductive adhesive significantly decreases after either water or dry grinding. Dry grinding, in particular, yields an even lower sheet resistance of 5 kΩ / □, making it more suitable for solid-state battery electrodes.

[0037] like Figure 7 As shown, in Comparative Example 1, conventional electrospinning process was used without airflow assistance, and no bead chain-like conductive nanofibers were formed, resulting in the inability to disperse the material evenly during subsequent grinding. Figure 8 As shown, the performance of the conductive adhesive is affected. The data in Tables 1 and 2 show that although the block resistance of the conductive nanofibers prepared in Comparative Example 1 is not much different from that in Examples 1 and 2, the block resistance of the conductive adhesive prepared after subsequent grinding and dispersion is higher and cannot meet expectations.

[0038] like Figure 9 and Figure 10 As shown, since the electrospinning parameters of Comparative Example 2 were adjusted to a temperature of 40°C and a humidity of less than 55%, the electrospinning parameters of Comparative Example 3 were adjusted to a temperature of less than 35°C and a humidity of 65%. The conductive nanofibers collected in Comparative Examples 2 and 3 were all bonded into blocks with poor fiber morphology, resulting in the inability to grind and disperse them subsequently, and no conductive adhesive was made.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing a conductive adhesive for solid-state battery electrodes, characterized in that: S1. dissolving a conductive agent in an organic solvent to prepare a solution; S2, adding a polymer binder to the solution in step S1, stirring and dispersing, and preparing an electrospinning solution; S3, preparing conductive nanofibers by using the electrospinning solution prepared in step S2 through an airflow-assisted electrospinning process; S4. Heat-treating the conductive nanofibers obtained in step S3, and then grinding and dispersing them to obtain the conductive adhesive.

2. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: The conductive agent is at least one of carbon nanotubes, nanographite and graphene.

3. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: The polymer binder is at least one of polyvinylidene fluoride and polyacrylonitrile.

4. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: The organic solvent is one of dimethylformamide or dimethylacetamide.

5. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: The mass ratio of the conductive agent to the polymer binder is 80-99.9:10-20.

6. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: In step S2, the solid content of the electrospinning solution is 1-20%.

7. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: In step S3, the airflow-assisted electrospinning process parameters are: positive electrode voltage of 15 to 30 kV, negative electrode voltage of -3 to -0.5 kV, liquid supply rate of the nozzle of 1 to 10 mL / hr, auxiliary airflow flow rate of 10 to 50 L / min, distance from the nozzle to the collecting plate of 10 to 15 cm, ambient temperature of 20 to 30 ° C, and ambient humidity of <55%.

8. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: In step S4, the average particle size of the conductive adhesive is less than 1 mm.

9. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: In step S4, the grinding and dispersion adopts a dry grinding method, which includes the following steps: putting a certain amount of the conductive nanofibers into a reactor for grinding, wherein the rotation speed is 3000 r / min, the grinding time is 5 minutes, and the conductive adhesive is obtained after sieving.

10. The method for preparing a conductive adhesive for solid-state battery electrodes according to claim 1, wherein: In step S4, the grinding and dispersion is carried out by a water milling method, comprising the following steps: adding a fixed amount of the conductive nanofibers and deionized water into a reaction kettle, and grinding by increasing the speed in sequence: (a) grinding at 2000 r / min for 30 min, (b) grinding at 4000 r / min for 30 min, and (c) grinding at 6000 r / min for 60 min; The ground conductive nanofibers were then drained and dried at 60° C. for 60 minutes, and then further dried at 80° C. for 60 minutes to obtain the conductive adhesive.

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