Fibrous conductive agent for solvent-free system and method for preparing fibrous conductive agent by applying bicontinuous phase structure

Abstract

In order to overcome the defects that when an existing conductive carbon material is applied to dry-method electrode preparation, the conductive carbon material cannot be effectively dispersed under the action of shearing force, and the conductivity cannot be normally exerted, the invention provides a fibrous conductive agent which is a composite fibrous conductive agent composed of a conductive carbon material and a high-molecular compound in a mass ratio of (0.1-2): 1, or a fibrous conductive carbon material, the method for preparing the fibrous conductive agent by using the bicontinuous phase structure comprises the following steps: preparing a conductive carbon dispersion; melting and mixing the conductive carbon dispersion and the polymer A to obtain M1; melting, mixing, extruding, stretching and quenching the M1, a polymer B and a compatilizer to obtain M2, controlling the processing temperature to enable A and B to form a bicontinuous structure, and positioning conductive carbon in A and at the interface of A and B; and dissolving out the polymer B and the compatilizer in the M2, and drying and crushing to obtain the composite fibrous conductive agent. The fibrous conductive agent disclosed by the invention is wholly loose and can be uniformly dispersed under the shearing force of dry-method electrode preparation, so that the effective exertion of the conductivity is ensured.

Description

Technical Field

[0001] The present invention relates to the field of conductive materials, in particular to a fibrous conductive agent for a solvent-free system and a method for preparing the fibrous conductive agent by using a dual-continuous phase structure. Background Art

[0002] Dry electrode manufacturing technology is a solvent-free electrode manufacturing method that directly presses the electrode active material, conductive agent powder, and binder onto a metal current collector to form the electrode. Compared to the wet method, dry electrode manufacturing technology does not require a large factory floor to dry the solvent, reducing capital and labor costs required for the factory and being more environmentally friendly.

[0003] However, existing high-performance conductive agents, such as carbon nanotubes, graphene and other conductive carbon materials, are nanomaterials. The interaction forces between nanomaterials, such as entanglement and stacking, and the shear force used in the commonly used dry electrode preparation technology cannot evenly disperse these conductive carbon materials in the electrode active material, and cannot exert the conductive properties of the conductive carbon materials, thereby affecting the properties of the prepared electrode.

[0004] Therefore, it is necessary to provide a conductive agent for a solvent-free system, which can be effectively dispersed under the shear force during the dry electrode preparation process, thereby ensuring the properties of the prepared electrode. Summary of the Invention

[0005] The present invention overcomes the shortcomings of the prior art in which conductive carbon materials cannot be effectively dispersed under the action of shear force when used as conductive agents in the dry electrode preparation process, resulting in the inability to exert normal conductive properties and affecting the electrode properties. It provides a fibrous conductive agent for a solvent-free system and a method for preparing a fibrous conductive agent using a dual-continuous phase structure.

[0006] The technical solution adopted by the present invention to achieve the first invention purpose is: a fibrous conductive agent for a solvent-free system, which is: a composite fibrous conductive agent composed of a conductive carbon material and a polymer compound, or a fibrous conductive carbon material; in the composite fibrous conductive agent, the mass ratio of the conductive carbon material to the polymer compound is (0.1~2):1.

[0007] The beneficial effect of the fibrous conductive agent of the present invention is: providing a fibrous conductive agent containing conductive carbon material, the fibrous conductive agent can be evenly dispersed under the shear force of dry electrode preparation, effectively avoiding the agglomeration of nanomaterials, ensuring the effective performance of the conductive properties of the conductive agent, and then ensuring the conductivity of the battery electrode, which is beneficial to the application of nano conductive carbon materials.

[0008] The technical solution adopted by the present invention to achieve the second invention object is: a method for preparing a fibrous conductive agent using a dual-continuous phase structure. When the fibrous conductive agent is a composite fibrous conductive agent composed of a conductive carbon material and a polymer compound in the above technical solution, the preparation method includes the following steps:

[0009] S1, pretreating the conductive carbon material with a dispersant to obtain a conductive carbon material dispersion containing the conductive carbon material and the dispersant;

[0010] S2, melt-mixing the conductive carbon material dispersion obtained in step S1 with a high-melting-point polymer compound A to obtain a mixture M1;

[0011] The melting point of the polymer compound A: Tm high ≥ 130°C;

[0012] The polymer compound A is a non-polar polymer compound;

[0013] S3, adding the low melting point polymer compound B and the compatibilizer to the mixture M1 obtained in step S2, melt mixing, then melt extruding, stretching, and quenching to obtain a mixture M2;

[0014] The melting point of the polymer compound B is: Tm≤100°C;

[0015] The polymer compound B is a polar polymer compound;

[0016] In step S3, the processing temperatures of melt mixing and melt extrusion of the mixture M1, the polymer compound B, and the compatibilizer are controlled respectively, so that the polymer compounds A and B in the obtained mixture M2 form a bicontinuous phase structure, and the conductive carbon material is located in the polymer compound A and at the interface between the polymer compounds A and B;

[0017] S4. Dissolve the polymer compound B and the dispersant in the mixture M2 obtained in step S3 to obtain a mixture M3, which is then dried and crushed to obtain a composite fibrous conductive agent composed of the conductive carbon material and the polymer compound A.

[0018] Furthermore, when the fibrous conductive agent is the fibrous conductive carbon material described in the above technical solution, the preparation method further includes the following steps: S5, calcining the composite fibrous conductive agent obtained in step S4 at 300-600°C to obtain a fibrous conductive carbon material.

[0019] The method of preparing a fibrous conductive agent using a dual-continuous phase structure of the present invention has the following beneficial effects: (1) based on the difference in melting point and polarity of polymer compounds A and B, a fibrous composite conductive agent is prepared by in-situ fiberization of the polymer mixture during the melting process, and then a fibrous conductive carbon material is obtained by calcination. Since both conductive agents are fibrous, they are easily dispersed under shear force during the dry electrode preparation process, thereby ensuring the effective performance of the conductive performance;

[0020] (2) Both polymer compound A and the conductive carbon material are non-polar materials, which is conducive to the formation of a co-melt between the two. Polymer compound B is a non-polar material, which prevents the conductive carbon material dispersed in polymer compound A from diffusing into polymer compound B in the preparation step S3. Moreover, when polymer compound B and A are mixed and melted, no co-solvent phenomenon occurs, which is conducive to the formation of a bicontinuous phase.

[0021] (3) In the preparation step S3, in the mixture M2 formed, the polymer compound A and the polymer compound B form a dual-continuous phase structure, and the conductive carbon material is located in the polymer compound A and at the interface between the polymer compound A and the polymer compound B. The polymer compound B and the dispersant are then dissolved, and the composite fibrous conductive agent obtained after drying and crushing has no agglomeration, tight entanglement, or mutual adhesion between the fibers of the conductive agent. The conductive agent is loose as a whole, which is conducive to the effective performance of the conductive agent and is easy to disperse during application.

[0022] (4) The fibrous conductive carbon material obtained by the preparation method of the present invention is a single conductive carbon material formed by calcining a loosely structured composite fibrous conductive agent to remove the polymer compound. There is a certain distance between the fibers of the conductive carbon material. Compared with the original conductive carbon material raw material, the fibrous conductive carbon material has higher dispersibility and is more conducive to the conductivity when used. In addition, due to the higher carbon content, the application advantages are higher.

[0023] (5) The fibrous conductive agent obtained by the preparation method of the present invention is suitable for use in solvent-free systems, generally in dry electrode preparation, conductive plastic preparation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attachment Figure 1 This is the SEM image of conductive agent 1.

[0025] Attachment Figure 2 This is the SEM image of the electrode prepared with conductive agent 1.

[0026] Attachment Figure 3 This is the SEM image of conductive agent 2.

[0027] Attachment Figure 4 This is the SEM image of conductive agent 3.

[0028] The present invention will be further described below through specific embodiments. DETAILED DESCRIPTION

[0029] Conductive carbon materials are typically used as conductive agents in dry electrode preparation. Conductive carbon materials include carbon nanotubes, graphene, conductive carbon black, graphite, and carbon fibers. One or more of these materials can be selected for dry electrode preparation. While conductive carbon materials offer excellent conductivity, their nanoscale size makes them prone to aggregation and stacking, making them difficult to disperse, hindering their application in dry electrode preparation.

[0030] To this end, the present invention provides a fibrous conductive agent for a solvent-free system, comprising a composite fibrous conductive agent composed of a conductive carbon material and a polymer compound, or a fibrous conductive carbon material; the composite conductive fibrous conductive agent comprises a mass ratio of the conductive carbon material to the polymer compound of (0.1-2):1. The fibrous conductive agent easily and evenly disperses under the shear force of dry electrode preparation, effectively resolving the difficulty in dispersing the original conductive carbon material during application and making it suitable for dry electrode preparation.

[0031] In order to ensure the content of the conductive carbon material when the dry electrode is used, the mass ratio of the conductive carbon material to the polymer compound in the composite conductive fibrous conductive agent is preferably (0.8-2):1.

[0032] Preferably, the polymer compound in the composite fiber-shaped conductive agent is a non-polar polymer compound. Since the conductive carbon material is also a non-polar substance, the non-polar polymer compound and the non-polar carbon material are easy to form a co-melt and are easy to combine.

[0033] The present invention adopts a dual-continuous phase structure to prepare a fibrous conductive agent. When the fibrous conductive agent is a composite fibrous conductive agent composed of a conductive carbon material and a polymer compound, the preparation method thereof comprises the following steps:

[0034] S1. Pretreating the conductive carbon material with a dispersant to obtain a conductive carbon material dispersion containing the conductive carbon material and the dispersant;

[0035] S2. Melting and mixing the conductive carbon material dispersion obtained in step S1 with a high-melting-point polymer compound A to obtain a mixture M1; the high-molecular compound A used has a melting point of: Tm high ≥ 130° C.; the high-molecular compound A is a non-polar high-molecular compound;

[0036] S3, adding a low-melting-point polymer B and a compatibilizer to the mixture M1 obtained in step S2, melt-mixing, and then melt-extruding, stretching, and quenching to obtain a mixture M2; the melting point of the polymer B used is: Tm is lower than 100° C.; the polymer B is a polar polymer compound;

[0037] In step S3, the processing temperatures of melt mixing and melt extrusion of the mixture M1, the polymer compound B, and the compatibilizer are controlled respectively, so that the polymer compounds A and B in the obtained mixture M2 form a bicontinuous phase structure, and the conductive carbon material is located in the polymer compound A and at the interface between the polymer compounds A and B;

[0038] S4. Dissolve the polymer compound B and the dispersant in the mixture M2 obtained in step S3 to obtain a mixture M3, which is then dried and crushed to obtain a composite fibrous conductive agent composed of the conductive carbon material and the polymer compound A.

[0039] When the fibrous conductive agent is a fibrous conductive carbon material, based on the preparation method of the composite fibrous conductive agent, the following steps are further included: S5, calcining the composite fibrous conductive agent obtained in step S4 at 300-600°C to obtain a fibrous conductive carbon material.

[0040] In step S1 of the above preparation method, the method of pretreating the conductive carbon material with a dispersant is:

[0041] S1.1. Mix the conductive carbon material, dispersant, and solvent in a mass ratio of (0.1-15):(0.1-5):(50-99) to obtain a pre-dispersion liquid;

[0042] S1.2. Sand-mill or high-pressure homogenize the pre-dispersed solution obtained in step S1.1 to obtain a conductive carbon material slurry;

[0043] S1.3. Dry the conductive carbon material slurry obtained in step S1.2 to obtain a solid and crush it to obtain a conductive carbon material dispersion containing the conductive carbon material and the dispersant.

[0044] When the dispersant is PVP, the obtained conductive carbon material dispersion is: conductive carbon material-PVP, which has a higher dispersion degree than the original conductive carbon material and is easy to use.

[0045] In step S2 of the above preparation method, the mass ratio of the conductive carbon material dispersion to the polymer compound A is preferably (0.1-2):1, and the polymer compound A is PP (polypropylene) and / or PE. PP and PE have stable properties, a wide molecular weight range, and a controllable melting point. Moreover, PP, PE, and the conductive carbon material, such as carbon nanotubes, are all non-polar materials, making them easy to form a co-melt.

[0046] The conductive carbon material dispersion and the polymer compound A are melt-mixed using an internal mixer or a recyclable twin-screw extruder. The processing time of the melt-mixing is 0.5 to 2 hours.

[0047] In step S3 of the above preparation method, the mass ratio of the added mixture M1, the polymer compound B, and the compatibilizer is (5-30):(70-95):(0-5).

[0048] Polymer B is EVA and / or PEO. EVA and PEO have lower melting points than PP and PE, creating a state where polymer A is non-molten and polymer B is molten. In this state, the conductive carbon material dispersed within polymer A does not diffuse into polymer B. EVA and PEO are polar materials and are not easily mixed with PP and PE, resulting in a co-continuous phase. The compatibilizer, typically PP-g-MAH (maleic anhydride grafted polypropylene), allows for controlled blending of polymers A and B, facilitating the formation of a smaller-scale co-continuous phase structure.

[0049] The melting point of polymer compound A is Tm high ≥ 130°C, and the melting point of polymer compound B is Tm low ≤ 100°C. The melting point difference between the two phases is the basic condition for forming a bicontinuous phase. The melting point difference between polymer compounds A and B is preferably: Tm high - Tm low ≥ 30°C.

[0050] In addition, in step S3, in order to prepare a mixture M2 in which polymer compounds A and B form a dual-continuous phase structure, the processing temperatures of melt mixing and melt extrusion of the mixture M1 with the polymer compound B and the compatibilizer need to be controlled respectively. Preferably, these two temperatures are: (1) Tm low < processing temperature of melt mixing of the mixture M1 with the polymer compound B and the compatibilizer < Tm high. Further preferably, the processing temperature of melt mixing of the mixture M1 with the polymer compound B and the compatibilizer is: Tm low + 50°C; (2) the processing temperature of melt extrusion of the mixture after melt mixing of the mixture M1 with the polymer compound B and the compatibilizer is: Tm low ± 10°C.

[0051] At the processing temperature for melt mixing the mixture M1 and the polymer compound B in step S3, the viscosity ratio of the mixture M1 to the polymer compound B is less than 0.7. Within this viscosity ratio range, the polymer compound A in the mixture M1 is more likely to form a cocontinuous phase with the polymer B. The melt mixing processing time is 0.5 to 2 hours.

[0052] In step S3, the melt-mixed mixture M1 and the polymer compound B are melt-extruded, stretched by a traction device with a stretching ratio of 2 to 10 times, and then quenched to form a mixture M2. In the mixture M2, the polymer compound A and the polymer compound B form a dual-continuous phase structure, and the conductive carbon material is located in the polymer compound A and at the interface between the polymer compound A and the polymer compound B. The phase composed of the polymer compound A and the conductive carbon material dispersion in the mixture M2 is fibrous, and the fiber diameter is 100nm to 5000nm. In step S4 of the above preparation method, a solvent is required to dissolve the polymer compound B and the dispersant in the mixture M2 obtained in step S3, and the undissolved part is taken out to obtain the mixture M3. After drying, a composite fibrous conductive agent composed of the conductive carbon material and the polymer compound A is obtained; the solvent used is generally toluene.

[0053] The present invention is further analyzed below through the following examples and comparative examples.

[0054] Example 1

[0055] The conductive carbon material is selected as carbon nanotubes.

[0056] A carbon nanotube dispersion was prepared as follows: 50 g, 10 g, and 940 g of carbon nanotubes (CNTs), PVP, and water were mixed using a homogenizing emulsifier pump at 20,000 RPM to obtain a pre-dispersion. The pre-dispersion was then mixed uniformly using a high-pressure homogenizer at 100 MPa to obtain a carbon tube slurry. The carbon tube slurry was then placed in an oven and dried at 80°C for 24 hours. The solid was then mechanically crushed to obtain 60 g of a carbon tube-treated powder (carbon tube dispersion).

[0057] Preparation of composite fiber conductive agent: After preheating the internal mixer to 190°C, add 60g of PP into the internal mixer, with the internal mixer rotor speed at 30RPM, add 60g of carbon tube dispersion, and mix for 30 minutes;

[0058] After that, the heating function of the internal mixer was turned off, and 400 g of EVA resin (vinyl acetate content of about 30%) and 5 g of compatibilizer (maleic anhydride grafted PP, PP-g-MAH) were added to the internal mixer. At the same time, the rotor speed of the internal mixer was adjusted to 10 RPM. The mixture was mixed uniformly at 150°C for one hour, and the rotor was stopped. After cooling to room temperature, the mixture was removed.

[0059] The extruder was preheated to 150°C and the mixture was added to the extruder. The extrusion port temperature was controlled at 90°C, the screw speed was 30 RPM, and the circular extrusion port diameter was 5 mm. After extrusion, the material was stretched in a tractor at a stretch ratio of approximately 5x. After stretching, it was immediately immersed in cold water to cool down, obtaining a CNT / PVP / PP / EVA / PP-g-MAH composite fiber.

[0060] The composite fiber was then immersed in toluene. The PVP EVA in the fiber was dissolved by immersing it in 1 L of toluene at room temperature. The undissolved portion was removed and dried in an oven at 50°C to obtain CNT / PP microfibers, which were recorded as conductive agent 1.

[0061] Example 2

[0062] Conductive agent 1 obtained in Example 1 was transferred to a tube furnace, the temperature was set to 300° C., and the temperature was kept for 2 hours to obtain CNT microfibers, which were recorded as conductive agent 2.

[0063] Comparative Example 1

[0064] According to the method for preparing a carbon nanotube dispersion in Example 1, a carbon nanotube dispersion was prepared and recorded as conductive agent 3.

[0065] Comparative analysis of SEM photos of conductive agents 1, 2, and 3: (1) Figure 1 , the entanglement tightness between the CNT / PP microfibers of the conductive agent 1 is low, and there is a certain gap between the fibers, which is convenient for subsequent shear stirring and dispersion; (2) Figure 3 , the conductive agent 2 is treated at high temperature, and as the PP decomposes, the entanglement between the CNT fibers is reduced, the clustering is reduced, and the gaps between the fibers are further increased, making it easier to disperse by shearing in the future; (3) Figure 4 The CNTs in the conductive carbon nanotube dispersion are tightly adhered together, stacked on top of each other, and partially in agglomerate. Therefore, the fibrous conductive agent CNT / PP microfibers and fibrous conductive carbon materials (fibrous CNTs) of the present invention overcome the drawback of the original carbon nanotubes being difficult to disperse.

[0066] Figure 2 This is the SEM image of the electrode piece prepared by dry electrode using conductive agent 1. It can be seen that under the shear force during the dry electrode preparation process, the fibrous conductive agent is further dispersed in the positive electrode main material, which is conducive to the effective performance of its conductivity.

[0067] Conductive agents 1, 2, and 3 were used to prepare dry electrodes, and the electrode sheet resistivity of the obtained dry electrodes was measured. The amount of conductive agent added (g) was added according to the content of effective conductive material (i.e., carbon nanotubes) in the conductive agent. The carbon nanotube content in the three conductive agents was 5.9 g. The addition amounts of the positive electrode main material and the binder were the same. The test results of the electrode sheet resistivity are shown in Table 1.

[0068] Table 1 Comparison of test results of electrodes prepared by three conductive agents

[0069] sample Conductive agent 1 Conductive agent 2 Conductive agent 3 Conductive agent addition amount (g) 12.98 5.9 7.09 Amount of positive electrode main material added (g) 400 400 400 Binder addition amount (g) 9.57 9.57 9.57 Electrode resistivity (Ω·cm) 31.22 30.22 45.5

[0070] From the analysis of Table 1, it can be seen that: (1) when the content of effective conductive material is the same, the properties of the electrodes prepared by using conductive agent 1 and conductive agent 2 are significantly better than those of the electrode prepared by using only the conductive agent dispersion dispersed with PVP. It can be seen that the fibrous conductive carbon material obtained by the method of the present invention for preparing a fibrous conductive agent using a dual-continuous phase structure has better dispersibility and conductivity than the untreated conductive carbon material; (2) The properties of the electrode prepared by conductive agent 2 are slightly better than those of the electrode prepared by using conductive agent 1. The reason may be that the fibrous conductive carbon material in the conductive agent 2 after calcination is looser and does not contain additional polymer compounds, which is conducive to more effective conductivity of the conductive carbon material.

Claims

1. A fibrous conductive agent for a solvent-free system, characterized in that: The fibrous conductive agent is a composite fibrous conductive agent composed of a conductive carbon material and a polymer compound, or a fibrous conductive carbon material; In the composite fiber-shaped conductive agent, the mass ratio of the conductive carbon material to the polymer compound is (0.1-2):

1.

2. The fibrous conductive agent for a solvent-free system according to claim 1, characterized in that: The conductive carbon material is one or more of carbon nanotubes, graphene, conductive carbon black, graphite, and carbon fiber; And / or the polymer compound in the composite fiber-shaped conductive agent is: a non-polar polymer compound; And / or in the composite fibrous conductive agent, the mass ratio of the conductive carbon material to the polymer compound is (0.8-2):

1.

3. A method for preparing a fibrous conductive agent using a bicontinuous phase structure, characterized in that: When the fibrous conductive agent is a composite fibrous conductive agent composed of the conductive carbon material and a polymer compound as claimed in claim 1 or 2, the preparation method of the fibrous conductive agent comprises the following steps: S1. Pretreating the conductive carbon material with a dispersant to obtain a conductive carbon material dispersion containing the conductive carbon material and the dispersant; S2, melt-mixing the conductive carbon material dispersion obtained in step S1 with a high-melting-point polymer compound A to obtain a mixture M1; The melting point of the polymer compound A: Tm high ≥ 130°C; The polymer compound A is a non-polar polymer compound; S3, adding the low melting point polymer compound B and the compatibilizer to the mixture M1 obtained in step S2, melt mixing, then melt extruding, stretching, and quenching to obtain a mixture M2; The melting point of the polymer compound B: Tm is lower than or equal to 100°C; The polymer compound B is a polar polymer compound; In step S3, the processing temperatures of melt mixing and melt extrusion of the mixture M1, the polymer compound B, and the compatibilizer are controlled respectively, so that the polymer compounds A and B in the obtained mixture M2 form a bicontinuous phase structure, and the conductive carbon material is located in the polymer compound A and at the interface between the polymer compounds A and B; S4. Dissolve the polymer compound B and the dispersant in the mixture M2 obtained in step S3 to obtain a mixture M3, which is then dried and crushed to obtain a composite fibrous conductive agent composed of the conductive carbon material and the polymer compound A.

4. The method for preparing a fibrous conductive agent using a bicontinuous phase structure according to claim 3, wherein: When the fibrous conductive agent is the fibrous conductive carbon material according to claim 1 or 2, the preparation method of the fibrous conductive agent further comprises the following steps: S5. calcining the composite fibrous conductive agent obtained in step S4 at 300-600° C. to obtain a fibrous conductive carbon material.

5. A method for preparing a fibrous conductive agent using a bicontinuous phase structure according to claim 3 or 4, characterized in that: The conductive carbon material dispersion is: conductive carbon material-PVP; The polymer compound A is PP and / or PE; The polymer compound B is EVA and / or PEO; The compatibilizer is PP-g-MAH.

6. A method for preparing a fibrous conductive agent using a bicontinuous phase structure according to claim 3 or 4, characterized in that: In the step S1, the method of pretreating the conductive carbon material with a dispersant is: S1.

1. Mix the conductive carbon material, dispersant, and solvent in a mass ratio of (0.1-15):(0.1-5):(50-99) to obtain a pre-dispersion liquid; S1.

2. The pre-dispersed liquid obtained in step S1.1 is mixed uniformly by sand milling or high-pressure homogenization to obtain a conductive carbon material slurry; S1.

3. Dry the conductive carbon material slurry obtained in step S1.2 to obtain a solid and crush it to obtain a conductive carbon material dispersion containing the conductive carbon material and a dispersant.

7. A method for preparing a fibrous conductive agent using a bicontinuous phase structure according to claim 3 or 4, characterized in that: In the step S2, the conductive carbon material dispersion and the polymer compound A are melt-mixed in a mass ratio of (0.1-2):1; In the step S3, the mass ratio of the added mixture M1, polymer compound B, and compatibilizer is (5-30):(70-95):(0-5); In the step S3, when the mixture M1 and the polymer compound B are melt-mixed, the viscosity ratio of the mixture M1 to the polymer compound B is less than 0.7; The melting point difference between the polymer compounds A and B is: Tm high - Tm low ≥ 30°C.

8. The method for preparing a fibrous conductive agent using a bicontinuous phase structure according to claim 3 or 4, characterized in that: In the step S3, Tm low < the processing temperature of melt mixing of the mixture M1, the polymer compound B, and the compatibilizer < Tm high; In the step S3, the processing temperature of the mixture obtained by melt-mixing the mixture M1, the polymer compound B and the compatibilizer during melt extrusion is: Tm low ±10°C.

9. The method for preparing a fibrous conductive agent using a bicontinuous phase structure according to claim 8, characterized in that: In the step S3, the processing temperature for melt mixing of the mixture M1, the polymer compound B and the compatibilizer is: Tm low + 50°C.

10. The method for preparing a fibrous conductive agent using a bicontinuous phase structure according to claim 3 or 4, characterized in that: In the step S4, a solvent is used to dissolve the polymer compound B and the dispersant in the mixture M2 obtained in the step S3, and the undissolved part is taken out, dried, and crushed to obtain a composite fibrous conductive agent composed of the conductive carbon material and the polymer compound A; the solvent used is toluene.

Images