Preparation method of super-gravity enhanced battery electrode slurry

Abstract

The invention discloses a preparation method of super-gravity enhanced battery electrode slurry, and relates to the technical field of preparation of lithium ion / sodium ion battery electrode slurry, and the preparation method is characterized by comprising the following steps: S1, pre-dispersing raw materials, and mixing an active substance, a conductive agent and a binder in proportion at a low speed; s2, wetting and kneading the solvent step by step, adding the solvent in batches, firstly injecting part of the solvent for low-speed wetting and mixing, then gradually supplementing the solvent, and kneading to form a dough-shaped homogeneous material with viscoelastic characteristics; s3, supergravity enhanced dispersion: feeding the material into a supergravity reactor through a conveying pump, adding the residual solvent, and carrying out dispersion treatment under a supergravity field generated by high-speed rotation to prepare primary slurry; and S4, post-treatment: transferring the primary slurry to vacuum defoaming equipment to obtain the uniform, stable and low-defect electrode slurry, and the preparation method of the super-gravity enhanced battery electrode slurry can significantly improve the slurry mixing efficiency and the slurry performance.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion / sodium-ion battery manufacturing technology, and in particular to a method for preparing a supergravity-enhanced battery electrode slurry. Background Technology

[0002] The preparation (slurry mixing) of sodium-ion / lithium-ion battery electrode slurry is a core step in the electrode manufacturing process. Its goal is to achieve uniform dispersion of positive / negative electrode active materials, conductive agents and binders at the micro-nano scale in a solvent system to form a slurry that meets the rheological properties required for coating.

[0003] High-performance electrode slurries must simultaneously meet the following key indicators: 1. Dispersion uniformity: no local agglomeration of active materials and conductive agents; 2. Rheological stability: stable viscosity range; 3. Process compatibility: controllable solid content, no sedimentation or phase separation. The quality of the slurry directly determines the quality of the conductive network construction of the electrode, thus affecting the battery's capacity utilization, rate performance, and cycle life.

[0004] The existing mainstream planetary stirring process has the following technical bottlenecks: Low dispersion efficiency: It relies on macroscopic shear force, which makes it difficult to depolymerize soft agglomerates of nano-conductive agents. The resistivity of the slurry increases by 30-50% compared with the theoretical value (see CN113571725A), which restricts high-rate performance; High energy consumption and cost: High-hardness active materials (such as silicon-based anodes) require 4-8 hours to disperse, with unit energy consumption >20 kWh / t, accounting for more than 40% of the electrode manufacturing cost; High solid content process failure: Uneven solvent distribution at high solid content induces dry spot defects (see CN115831972A), resulting in coating surface density fluctuation >5%, which limits the improvement of energy density. Summary of the Invention

[0005] To address the problems of uneven dispersion, high energy consumption, and failure due to high solid content in existing electrode slurry preparation processes, the present invention aims to provide a method for preparing a supergravity-enhanced battery electrode slurry, which significantly improves slurry mixing efficiency and slurry performance.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for preparing a supergravity-enhanced battery electrode slurry includes the following steps: (1) Raw material predispersion The active material, conductive agent, and binder are first dry premixed at a speed of 100-500 rpm for 10-30 minutes.

[0007] The raw material pre-dispersion of the present invention adopts dry mixing at low speed, the purpose of which is to initially deagglomerate the agglomerates, achieve pre-dispersion and inhibit agglomeration.

[0008] Preferably, in step (1): The active material is selected from any one of the following: layered oxide cathode material or polyanion cathode material for sodium-ion batteries; layered oxide cathode material or lithium iron phosphate cathode material for lithium-ion batteries; hard carbon anode material or graphite anode material.

[0009] The conductive agent is selected from any one of carbon black, carbon nanotubes, graphene, or conductive polymers.

[0010] The adhesive is selected from any one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), or sodium carboxymethyl cellulose (CMC).

[0011] (2) Solvent stepwise wetting and kneading After the material is processed in step (1), solvent is added in batches. First, a portion of the solvent is injected for low-speed wetting and mixing, and then the solvent is gradually added. After kneading, a homogeneous material with dough-like viscoelastic properties is formed.

[0012] Preferably, in step (2): The solvent is N-methylpyrrolidone (NMP), dimethylacetamide (DMAc), or deionized water.

[0013] The total amount of solvent used is 70%-110% of the total mass of solids.

[0014] The solvent is added in batches: first, 40%-60% of the total solvent mass is added, and low-speed wetting and mixing is performed at 100-500 rpm for 30-120 minutes; then, 10%-20% of the total solvent mass is added, and mixing continues for 30-120 minutes within the same speed range; finally, another 10%-20% of the total solvent mass is added, and mixing is performed while maintaining the aforementioned speed and time conditions; through the above steps, the total amount of solvent added accounts for 80%-90% of the total solvent usage.

[0015] (3) Hypergravity-enhanced dispersion The homogeneous material prepared in step (2) is fed into a supergravity reactor, and the remaining solvent (10-20%) is added. The supergravity enhanced dispersion treatment is carried out at a speed of 500-3000 rpm to obtain a preliminary slurry.

[0016] Preferably, in step (3): The hypergravity factor of the hypergravity reactor is 100-2000×g, and the processing flow rate is 10-200L / h.

[0017] (4) Post-processing The slurry prepared in step (3) is introduced into a vacuum degassing device and simultaneously degassed and homogenized under vacuum conditions of -0.08 to 0.095 MPa and auxiliary stirring of 100 to 3000 rpm to obtain a supergravity-enhanced battery electrode slurry.

[0018] This invention also provides a method for preparing a supergravity-enhanced battery electrode slurry, applicable to NFPP sodium cathode slurry, comprising the following steps: (1) Weighing raw materials The active material NFPP powder, the conductive agent superconducting carbon black, and the binder polyvinylidene fluoride are precisely weighed according to the mass ratio. (2) Solvent stepwise wetting and kneading The solvent used is N-methyl-2-pyrrolidone, and the total amount of solvent used is 100% of the total mass of the solid. First, 60% of the NMP solvent and all the conductive agent were added to a container and dispersed at a high speed of 600 r / min for 120 minutes to obtain a uniform conductive agent slurry. Then, the active material NFPP and the binder PVDF were added, and the rotation speed was adjusted to 500 r / min, and mixing was continued for 90 minutes to form a preliminary paste. Finally, the solvent was added in two batches, each time adding 15% of the total mass of NMP. (3) Hypergravity-enhanced dispersion The homogeneous paste obtained in step (2) is transferred to a hypergravity reaction device. The rotation speed is set to 2500 rpm and the hypergravity factor is 700×g. During the process of the material flowing through the high gravity field, the remaining NMP solvent in step (2) is added simultaneously to strengthen the dispersion process for at least 90 minutes. (4) Post-processing After being dispersed by hypergravity, the slurry is immediately introduced into a vacuum degassing device with stirring function after being output from the device. The vacuum system is turned on to reduce the absolute pressure in the degassing chamber to about -0.08 MPa. Under this vacuum condition, the stirring paddle is started to carry out the vacuum dynamic degassing process for at least 30 minutes. After degassing is completed, the slurry is filtered and screened to finally obtain the hypergravity-enhanced battery electrode slurry.

[0019] The beneficial effects of this invention are as follows: This invention provides a method for synthesizing battery electrode slurry based on hypergravity field enhancement. The method utilizes the centrifugal force field generated by a hypergravity reactor to achieve microscopic mixing enhancement. Its mechanism and beneficial effects are as follows: Micro-mixing enhancement: The hypergravity field causes the fluid to form a nanoscale liquid film, which significantly improves the mass transfer efficiency.

[0020] Leap in dispersion performance: Synergistically enhanced shear force and turbulence intensity reduce dispersion time to less than 30% of conventional processes.

[0021] Structural optimization: The uniformity of dispersion of active materials and conductive agents is improved by >40%, the porosity is reduced by 15-30%, and the electrode conductive network is constructed more completely.

[0022] High versatility: Applicable to a variety of active materials in sodium / lithium-ion batteries (layered oxides, polyanionic compounds, hard carbon, etc.).

[0023] The present invention will be further described below with reference to specific embodiments. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments, but the present invention is not limited to the following embodiments. Unless otherwise specified, the raw materials and reagents used in the embodiments are all existing technologies in the field or commercially available products.

[0025] In the following embodiments, the supergravity reaction device adopts the RPB-301 rotating packed bed reactor from Beijing University of Chemical Technology, and the vacuum degassing equipment adopts the SIE-ME050.

[0026] The hypergravity reaction device of this invention can perform hypergravity field dispersion treatment under hypergravity factors of 100-2000×g, achieving three-stage dispersion of materials: Liquid film breakage: The material is stretched into a submicron-sized liquid film (thickness <1μm) by centrifugal force. Turbulence enhancement: The shear rate within the packing layer can reach 10. 4 -10 5 s -1 Completely depolymerizes nano-conductive agent aggregates; Dynamic control: Adjust the rotation speed in stages according to viscosity changes (500-1000 rpm during wetting period, 1500-3000 rpm during dispersion period). The formula for calculating the hypergravity factor is as follows: RCF=1.118×10 -5 ×r×(N) 2 .

[0027] In the formula, RCF is the relative centrifugal force, i.e., the hypergravity factor, and its unit is "×g".

[0028] r: Centrifugation radius, which is the distance from the center of the centrifuge shaft to the bottom of the sample tube, in centimeters.

[0029] N: Rotor speed, measured in revolutions per minute.

[0030] Example 1

[0031] This embodiment mainly involves the synthesis of layered oxide sodium cathode slurry under hypergravity. To demonstrate the universality of the hypergravity process, a PVDF / NMP oil-based binder system is used for illustration. This system is also suitable for layered oxide materials that are sensitive to moisture or need to operate under high voltage. The specific steps are as follows: S1: Raw material predispersion The layered oxide sodium nickel iron manganese oxide (NaNi) is used as the active material. 1 / 3 Fe 1 / 3 Mn 1 / 3 O2 powder, conductive superconducting carbon black (Super P), and binder polyvinylidene fluoride (PVDF) are precisely weighed at a mass ratio of 93:3:4. These three solid components are then added together into the mixing container of a planetary mixer. Under low-speed mixing conditions (setting the revolution speed to approximately 100 r / min), a dry powder premixing process is performed, continuing mixing for at least 30 minutes to ensure initial uniform dispersion of the solid powder.

[0032] S2: Solvent stepwise wetting and kneading After premixing, N-methyl-2-pyrrolidone (NMP) organic solvent is added to the mixing container in stages, with the total amount of solvent being 70% of the total solid mass.

[0033] First, add solvent equivalent to 50% of the total mass of NMP, adjust the mixer to revolution mode, and increase the speed to 300 r / min for wetting and dispersing. Continue running for 30 minutes to fully wet the solid powder and form a preliminary paste. Then, while maintaining this stirring mode, add solvent twice, each time adding 15% of the total NMP. During this process, the material undergoes continuous shearing and kneading, and its rheological state gradually transforms from a powder-paste mixture to a homogeneous "dough-like" paste with significant viscoelasticity, achieving preliminary homogenization and fusion of the components.

[0034] S3: Supergravity Enhanced Dispersion The homogeneous paste obtained in step S2 is transferred to a high-gravity reactor. The core rotor speed of the reactor is set to 2000 rpm, and the high-gravity factor is set to 450 × g. The material is continuously pumped into the high-gravity field region of the reactor at a constant rate of 50 L / h using a mechanical transfer pump. While the material flows through the high-gravity field, the remaining NMP solvent (20% of the total NMP mass) from step S2 is simultaneously added. During this process, the material undergoes high-intensity shearing, microscale mixing, and efficient mass transfer; this enhanced dispersion process continues for at least 60 minutes.

[0035] S4: Post-processing After being dispersed by ultragravity, the slurry is immediately introduced into a vacuum degassing device equipped with a stirring function. The vacuum system is turned on to reduce the absolute pressure in the degassing chamber to approximately -0.08 MPa. While maintaining this vacuum level, the stirring paddle is started (set to a speed of approximately 1000 rpm) to perform a vacuum dynamic degassing process for at least 30 minutes. After degassing, the slurry is filtered and sieved through a screen with a specified aperture to remove any trace amounts of large particle agglomerates or mechanical impurities, ultimately obtaining a sodium-ion battery cathode slurry with high uniformity and high stability that meets coating requirements.

[0036] Example 2

[0037] This embodiment mainly involves the synthesis of NFPP sodium electrode slurry under hypergravity conditions. The specific steps are as follows: S1: Raw material weighing The active material, polyanionic compound composite sodium iron phosphate (Na4Fe3(PO4)2P2O7) powder, the conductive agent, superconducting carbon black (Super P), and the binder, polyvinylidene fluoride (PVDF), were accurately weighed at a mass ratio of 94:3:3.

[0038] S2: Solvent stepwise wetting and kneading The solvent used is N-methyl-2-pyrrolidone (NMP), and the total amount of solvent used is 100% of the total mass of the solid.

[0039] First, 60% of the total mass of NMP solvent and all of the conductive agent Super P were added to a container and dispersed at a high speed of 600 r / min for 120 minutes to obtain a uniform conductive agent slurry. Then, the active material NFPP and the binder PVDF were added, and the rotation speed was adjusted to 500 r / min, and mixing continued for 90 minutes to form a preliminary paste. Finally, solvent was added twice, each time at 15% of the total mass of NMP. During this process, the material underwent continuous shearing and kneading, and its rheological state gradually changed from a powder-paste mixture to a homogeneous "dough-like" paste with significant viscoelasticity, achieving preliminary homogenization and fusion of the components.

[0040] S3: Supergravity Enhanced Dispersion The homogeneous paste obtained in step S2 is transferred to a high-gravity reactor. The core rotor speed of this reactor is set to 2500 rpm, the high-gravity factor to 700 × g, and the material is continuously pumped into the high-gravity field region of the reactor at a constant rate of 40 L / h using a mechanical transfer pump. While the material flows through the high-gravity field, the remaining NMP solvent (20% of the total NMP mass) from step S2 is simultaneously added. During this process, the material undergoes high-intensity shearing, microscale mixing, and efficient mass transfer; this enhanced dispersion process continues for at least 90 minutes.

[0041] S4: Post-processing After being dispersed by ultragravity, the slurry is immediately introduced into a vacuum degassing device equipped with a stirring function. The vacuum system is activated, reducing the absolute pressure inside the degassing chamber to approximately -0.08 MPa. While maintaining this vacuum level, the stirring paddle is started (set to a speed of approximately 1000 rpm) to perform a dynamic vacuum degassing process for at least 30 minutes. After degassing, the slurry is filtered and sieved through a screen with a specified aperture to remove any trace amounts of large particle agglomerates or mechanical impurities, ultimately obtaining a sodium-ion battery cathode slurry with high uniformity and high stability that meets coating requirements.

[0042] Example 3

[0043] This embodiment mainly involves the synthesis of hard carbon anode slurry under ultragravity conditions. The specific steps are as follows: S1: Raw material predispersion The active material hard carbon (HC) powder, the conductive agent superconducting carbon black (Super P), carbon nanotubes (CNTs), and the binder sodium carboxymethyl cellulose (CMC) were precisely weighed at a mass ratio of 92:3:1:4. The solid components were added to the mixing container of a planetary mixer and dry pre-dispersed for ≥30 minutes at low speed (approximately 100 r / min) to achieve preliminary homogenization of the components.

[0044] S2: Solvent stepwise wetting and kneading After premixing, deionized water is added to the mixing container in steps as a solvent, with the total amount of solvent being 110% of the total mass of the solid.

[0045] First, add 60% of the total solvent mass and increase the rotation speed to 300 r / min for 600 minutes to wet and disperse, forming a uniform paste. Then, maintaining this rotation speed, add the remaining solvent in two additions, each time adding 15% of the total solvent mass. During this process, the material is continuously sheared and kneaded, gradually transforming into a viscoelastic homogeneous paste.

[0046] S3: Supergravity Enhanced Dispersion The homogeneous paste obtained in step S2 is transferred to a high-gravity reactor. The core rotor speed of this reactor is set to 2000 rpm, the high-gravity factor to 450 × g, and the material is continuously pumped into the high-gravity field region of the reactor at a constant rate of 50 L / h using a mechanical transfer pump. During the flow of the material through the high-gravity field, the remaining deionized water solvent (10% of the total solvent mass) from step S2 is simultaneously added. During this process, the material undergoes high-intensity shearing, microscale mixing, and efficient mass transfer; this enhanced dispersion process continues for at least 60 minutes.

[0047] S4: Post-processing After being dispersed by ultragravity, the slurry is immediately introduced into a vacuum degassing device equipped with stirring function. The vacuum system is activated, reducing the absolute pressure in the degassing chamber to approximately -0.08 MPa. While maintaining this vacuum level, high-speed (1000 r / min) degassing is performed for 10 minutes to break large air bubbles, followed by degassing at 500 r / min for ≥20 minutes to eliminate microbubbles. After degassing, the slurry is filtered and sieved through a screen with a specified aperture to remove any trace amounts of large particle agglomerates or mechanical impurities, ultimately obtaining a highly uniform and stable sodium-ion battery cathode slurry that meets coating requirements.

[0048] Example 4

[0049] This embodiment aims to illustrate that the supergravity-enhanced dispersion process is suitable for the preparation of lithium-ion battery cathode slurry. The specific steps are as follows: S1: Raw material predispersion The active material, layered nickel cobalt manganese oxide (NCM) powder, the conductive agent, superconducting carbon black (Super P), carbon nanotubes (CNTs), and the binder, polyvinylidene fluoride (PVDF), were precisely weighed at a mass ratio of 94:2:1:3. The solid components were then placed into a planetary mixer container protected by an inert gas (N2) and dry pre-dispersed at low speed (approximately 100 r / min) for ≥30 minutes to achieve preliminary homogenization of the components.

[0050] S2: Solvent stepwise wetting and kneading After premixing, the organic solvent N-methyl-2-pyrrolidone (NMP) is added to the mixing container in stages, with the total amount of solvent being 80% of the total solid mass.

[0051] First, solvent equal to 40% of the total mass of NMP was added. The mixer was then set to revolution mode and the speed increased to 400 r / min for wetting and dispersing. This process was continued for 30 minutes to fully wet the solid powder and form a preliminary paste. Subsequently, while maintaining the stirring mode, solvent was added twice, each time at 20% of the total mass of NMP. During this process, the material underwent continuous shearing and kneading, and its rheological state gradually changed from a powder-paste mixture to a homogeneous "dough-like" paste with significant viscoelasticity, achieving the initial homogenization and fusion of the components.

[0052] S3: Supergravity Enhanced Dispersion The homogeneous paste obtained in step S2 is transferred to a high-gravity reactor. The core rotor speed of this reactor is set to 2000 rpm, the high-gravity factor to 450 × g, and the material is continuously pumped into the high-gravity field region of the reactor at a constant rate of 50 L / h using a mechanical transfer pump. While the material flows through the high-gravity field, the remaining NMP solvent (20% of the total NMP mass) from step S2 is simultaneously added. During this process, the material undergoes high-intensity shearing, microscale mixing, and efficient mass transfer; this enhanced dispersion process continues for at least 60 minutes.

[0053] S4: Post-processing After being dispersed under enhanced gravity, the slurry is immediately introduced into a vacuum degassing device equipped with stirring function. The vacuum system is activated, reducing the absolute pressure inside the degassing chamber to approximately -0.095 MPa. While maintaining this vacuum level, high-speed (1000 r / min) degassing is performed for 10 minutes to break large air bubbles, followed by degassing at 500 r / min for ≥20 minutes to eliminate microbubbles. After degassing, the slurry is filtered and sieved through a screen with a specified aperture to remove any trace amounts of large particle agglomerates or mechanical impurities, ultimately obtaining a lithium-ion battery cathode slurry with high uniformity and high stability that meets coating requirements.

[0054] Comparative Example 1: Conventional Synthetic Oxygen Sodium Electrode Slurry The preparation method is the same as in Example 1, except that step S3 does not use a supergravity device, but instead uses a planetary mixer to disperse the mixture in a mixing container at 400 r / min (revolution) + 1500 r / min (rotation) for 6 hours.

[0055] Comparative Example 2: Conventionally synthesized NFPP sodium cathode slurry The preparation method is the same as in Example 2, except that step S3 does not use a supergravity device, but instead uses a planetary mixer to disperse the mixture in a mixing container at 400 r / min (revolution) + 1500 r / min (rotation) for 6 hours.

[0056] Comparative Example 3: Conventional Synthetic Hard Carbon Anode Slurry The preparation method is the same as in Example 3, except that step S3 does not use a supergravity device, but instead uses a planetary mixer to disperse the mixture in a mixing container at 400 r / min (revolution) + 1500 r / min (rotation) for 6 hours.

[0057] Comparative Example 4: Conventional Synthetic Layered Oxide Lithium-ion Battery Cathode Slurry The preparation method is the same as in Example 4, except that step S3 does not use a supergravity device, but instead uses a planetary mixer to disperse the mixture in a mixing container at 400 r / min (revolution) + 1500 r / min (rotation) for 6 hours.

[0058] Performance testing: Solid content test: The solid content test adopts thermogravimetric analysis. The procedure is as follows: accurately weigh a small amount of slurry sample (denoted as M1) and place it in a weighing bottle or petri dish that has been constant-weighted. Then place it in an oven that has been heated to 105±5℃ and continue heating. After the sample is completely dry, transfer it to a desiccator to cool to room temperature, and accurately weigh the mass of the remaining solid material again (denoted as M2). Finally, calculate the solid content of the slurry using the formula (M2 / M1 × 100%).

[0059] Viscosity test: Viscosity testing mainly uses a rotational viscometer, and the procedure is as follows: the well-stirred slurry sample is placed into a sufficiently large beaker, a suitable rotor (No. 5) is selected and inserted into the sample at a fixed speed (60 rpm); the instrument is started under constant temperature conditions of 25°C, and the viscosity value is recorded after the reading stabilizes. This procedure needs to be repeated several times to ensure the repeatability and accuracy of the results. The solid content and viscosity data of Examples 1-4 and Comparative Examples 1-4 are tested.

[0060] The test results are shown in Table 1.

[0061] Table 1 .

[0062] analyze: As shown in Table 1, this invention achieves micro-mixing enhancement through the centrifugal force field generated by the supergravity reactor, significantly improving the mixing efficiency and slurry performance, while reducing the equipment volume by more than 50%.

[0063] (1) Slurry mixing efficiency By comparing the mixing time of Example 1 and Comparative Example 1, it can be found that the present invention significantly improves the mixing efficiency. The mixing time using the supergravity device is 1 hour, while the mixing time of the traditional planetary mixer mixing container is 6 hours, resulting in a significant improvement in mixing efficiency.

[0064] (2) Slurry properties As can be seen from the comparison in Table 1, the micro-mixing enhancement achieved by the centrifugal force field generated by the supergravity reactor significantly improves the viscosity properties of the slurry.

[0065] (3) Equipment volume Because high-gravity reactors generate enormous centrifugal force through high-speed rotating packing or structures, their mixing intensity is far higher than that of planetary mixers that rely on the revolution of a large disc and the rotation of impellers. Therefore, they do not require large stirred tanks and slow diffusion processes, and can achieve the same or even better mixing results in a much smaller equipment volume (50% reduction in equipment volume).

[0066] The above embodiments are merely illustrative examples of the present invention and do not constitute a limitation on the scope of protection of the present invention. The scope of protection of the present invention shall be determined by the claims.

Claims

1. A method for preparing a supergravity-enhanced battery electrode slurry, characterized in that, Includes the following steps: (1) Raw material predispersion The active material, conductive agent, and binder are first dry premixed at a speed of 100-500 rpm for 10-30 minutes. (2) Solvent stepwise wetting and kneading After the material is processed in step (1), solvent is added in batches. First, a portion of the solvent is injected for low-speed wetting and mixing, and then the solvent is gradually added. After kneading, a homogeneous material with dough-like viscoelastic properties is formed. (3) Hypergravity-enhanced dispersion The homogeneous material prepared in step (2) is fed into a supergravity reactor, the remaining solvent is added, and supergravity enhanced dispersion is carried out at a speed of 500-3000 rpm to obtain a preliminary slurry. (4) Post-processing The slurry prepared in step (3) is introduced into a vacuum degassing device and simultaneously degassed and homogenized under vacuum conditions of -0.08 to 0.095 MPa and auxiliary stirring of 100 to 3000 rpm to obtain a supergravity-enhanced battery electrode slurry.

2. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (1): the active material is selected from any one of the layered oxide cathode material or polyanion cathode material of sodium-ion battery; layered oxide cathode material or lithium iron phosphate cathode material of lithium-ion battery; hard carbon anode material or graphite anode material.

3. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (1): the conductive agent is selected from any one of carbon black, carbon nanotubes, graphene or conductive polymer.

4. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (1): the adhesive is selected from any one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), or sodium carboxymethyl cellulose (CMC).

5. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (2): the solvent is N-methylpyrrolidone (NMP), dimethylacetamide (DMAc), or deionized water.

6. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (2): the total amount of solvent used is 70%-110% of the total mass of solids.

7. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (2): the solvent is added in batches: first, 40%-60% of the total solvent mass is added and wetting and mixing is performed at a low speed of 100-500 rpm for 30-120 minutes; then, 10%-20% of the total solvent mass is added and mixing is continued for 30-120 minutes at the same speed range; finally, another 10%-20% of the total solvent mass is added and mixing is performed while maintaining the aforementioned speed and time conditions; after the above steps, the total amount of solvent added accounts for 80%-90% of the total amount of solvent used.

8. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (3): the hypergravity factor of the hypergravity reactor is 100-2000×g, and the processing flow rate is 10-200L / h.

9. The method for preparing a supergravity-enhanced battery electrode slurry according to claim 1, characterized in that: In step (3): the remaining solvent is added at 10-20% of the total solvent mass.

10. A method for preparing a supergravity-enhanced battery electrode slurry, characterized in that, Includes the following steps: (1) Weighing raw materials The active material NFPP powder, the conductive agent superconducting carbon black, and the binder polyvinylidene fluoride are precisely weighed according to the mass ratio. (2) Solvent stepwise wetting and kneading The solvent used is N-methyl-2-pyrrolidone, and the total amount of solvent used is 100% of the total mass of the solid. First, 60% of the NMP solvent and all the conductive agent were added to a container and dispersed at a high speed of 600 r / min for 120 minutes to obtain a uniform conductive agent slurry. Then, the active material NFPP and the binder PVDF were added, and the rotation speed was adjusted to 500 r / min, and mixing was continued for 90 minutes to form a preliminary paste. Finally, the solvent was added in two batches, each time adding 15% of the total mass of NMP. (3) Hypergravity-enhanced dispersion The homogeneous paste obtained in step (2) is transferred to a hypergravity reaction device. The rotation speed is set to 2500 rpm and the hypergravity factor is 700×g. During the process of the material flowing through the high gravity field, the remaining NMP solvent in step (2) is added simultaneously to strengthen the dispersion process for at least 90 minutes. (4) Post-processing After being dispersed by hypergravity, the slurry is immediately introduced into a vacuum degassing device with stirring function after being output from the device. The vacuum system is turned on to reduce the absolute pressure in the degassing chamber to about -0.08 MPa. Under this vacuum condition, the stirring paddle is started to carry out the vacuum dynamic degassing process for at least 30 minutes. After degassing is completed, the slurry is filtered and screened to finally obtain the hypergravity-enhanced battery electrode slurry.