A lithium battery negative electrode homogenizing method based on a circulating high-efficiency pulper

Abstract

The application discloses a kind of lithium battery negative electrode uniform slurry method based on circulating high-efficiency pulper, including the following steps: powder premixing, powder-liquid mixing dispersion, circulating homogenization, additive dispersion, binder compounding and vacuum treatment five steps.Powder-liquid dispersion stage defines linear velocity 21~23m / s, pump flow L=3S;With main shaft torque 70% as threshold value, automatically adjust the discharging rate, halve feeding when overload and reduce feeding speed;Collaborate 7~10 ℃ cold water, control slurry temperature in 50 ℃ by temperature control formula;Real-time calculation of plugging coefficient K, automatically slow down to prevent jamming when abnormal.The process under powder solid content 58%~61%, solid content 53%~56% of discharge, only 110min per batch slurry making.This scheme does not need to transform equipment, can stably realize high solid content slurry making, solve slurry sedimentation, equipment overload shutdown problem, shorten production cycle, slurry performance is qualified, adapt to large-scale industrial production.

Description

Technical Field

[0001] This application relates to the field of lithium battery anode slurry preparation technology, specifically to a lithium battery anode slurry preparation method based on a circulating high-efficiency slurry mixer. Background Technology

[0002] The circulating high-efficiency pulping machine is the core equipment for homogenizing lithium battery anode slurry. Through the synergistic effect of high shear between the stator and rotor and material circulation, it achieves thorough dispersion and homogenization of the anode powder, solvent, and additives, which is crucial for ensuring the quality of the anode slurry and battery performance. Currently, the industry commonly uses dry and wet pulping processes to adapt to this equipment. However, traditional processes have many drawbacks, including poor equipment stability, limited production efficiency, and difficulty in balancing high-solids pulping with safe equipment operation. Specific problems are as follows: (1) In order to prevent equipment jamming, the existing circulating high-efficiency pulping machine negative electrode dry pulping process generally adopts a low solid content powder feeding method, with powder solid content <58% and discharge solid content <53%. Low solid content pulp will increase the load of subsequent thickening process, prolong the pulping cycle, reduce production efficiency, and also affect the stability of subsequent coating and drying processes, which cannot meet the needs of industrial high-efficiency mass production; (2) Some enterprises use a high solids content of 58%-61% powder feeding method, but the traditional process does not have a matching viscosity control and discharge optimization scheme. When the high solids content powder is fed, the viscosity of the slurry increases sharply and the fluidity deteriorates. Slurry sludge accumulation and powder agglomeration occur in the dispersion chamber and pipeline. The operating torque of the equipment increases significantly, and overload alarms and shutdowns occur frequently, which disrupts the continuity of production and increases operation and maintenance costs and slurry loss. (3) The existing wet circulating high-efficiency pulping process takes about 200 minutes per batch, which is low in production efficiency and difficult to meet the needs of large-scale mass production.

[0003] In summary, traditional processes cannot simultaneously achieve high solids content powdering, dynamic adjustment, viscosity control, and high-efficiency production. Currently, there is no effective solution, so it is necessary to improve traditional processes. Summary of the Invention

[0004] In view of the aforementioned background technology, the existing dry pulping process for negative electrodes using a low-solids-content powder feeding method increases the load on subsequent concentration processes, prolongs the pulping cycle, reduces production efficiency, and also affects the stability of subsequent coating and drying processes; the high-solids-content powder feeding method causes a sharp increase in slurry viscosity, poor fluidity, slurry accumulation and powder agglomeration inside the dispersion chamber and pipelines, a significant increase in equipment operating torque, frequent overload alarms and shutdowns, disrupting production continuity, increasing maintenance costs and slurry loss; and the existing wet circulating high-efficiency pulping process has low production efficiency. The purpose of this invention is to provide a lithium battery negative electrode homogenization method based on a circulating high-efficiency pulping machine.

[0005] To achieve the objectives of this invention, the technical solution provided by this invention is as follows: A method for homogenizing lithium battery anode slurry based on a circulating high-efficiency slurry mixer, used for dry slurry preparation of lithium battery anode, includes the following steps: Step S1: Powder premixing step; Step S2: Powder-liquid mixing and dispersion step; In step S2, the following settings are made: (1) Dispersion linear velocity The flow rate of the circulating pump is 21m / s-23m / s. satisfy: ; By increasing the dispersion linear velocity and coordinating it with a suitable circulating pump flow rate, the discharge speed of high-viscosity slurry in the dispersion chamber is accelerated, avoiding the local accumulation and retention of powder in the dispersion chamber to form agglomerates, thus solving the equipment jamming problem caused by poor material discharge. (2) The real-time torque of the main shaft of the dispersing mechanism of the circulating high-efficiency pulper The critical threshold is the powder feeding speed. The formula for segmented automatic control is: ;in, Used as the baseline powder feeding speed; (3) By controlling the dispersion linear velocity and cold water temperature Controlling slurry temperature To avoid the risk of sodium carboxymethyl cellulose failure caused by excessive temperature in the slurry, the formula is as follows: Among them, the temperature of cold water Temperature: 7℃-10℃; Step S3: Powder-liquid homogenization and circulation dispersion step; Step S4: Additive dispersing step; Step S5: Adhesive addition and final vacuum treatment; The method also includes real-time calculation of the blockage coefficient. and according to The steps for processing; The calculation formula is as follows: ;when When the operating condition is determined to be in a safe and stable state, with no risk of material blockage or machine jamming; when When an abnormal operating condition is detected, the parameter adjustment mechanism is automatically triggered, and the feeding speed is reduced to... Revert to a safe range.

[0006] This linkage mechanism can instantly reduce the amount of powder fed per unit time, quickly reduce the operating load of the dispersing mechanism, dynamically release the torque pressure of the equipment, avoid equipment alarms, shutdowns and jamming caused by continuous torque exceeding the limit, and achieve adaptive load adjustment. Furthermore, the aforementioned It is 70%.

[0007] Furthermore, in step S2, the following settings are also made: the initial solid content of the powder feeding stage is 58%-61%, and the solid content of the output is 53%-56%.

[0008] The initial solids content of the negative electrode slurry during the powder feeding stage is controlled at 58-61%, and the final solids content is controlled at 53-56%. By increasing the overall solids content of the slurry during the powder feeding stage, the overall final solids content is increased. This reduces the risk of high-solids content powder instantly entering the dispersion chamber and forming a high-viscosity gel, and avoids torque alarms and equipment jamming caused by excessive viscosity.

[0009] Furthermore, when the real-time torque of the main shaft of the dispersing mechanism of the circulating high-efficiency pulper... At this time, it is determined that the load of the dispersing mechanism is normal, and the benchmark powder feeding speed is maintained. =10kg / min powder feeding, corresponding to a rotary valve reference speed of 4r / min and a feed screw reference speed of 12r / min; when the real-time torque of the main shaft of the dispersing mechanism of the circulating high-efficiency pulper is... If the dispersing mechanism is deemed overloaded, the powder feeding speed will be halved. Simultaneously, the rotary valve speed was reduced to 2 r / min and the feed screw speed was reduced to 6 r / min.

[0010] Further, in step S1, the following materials are added sequentially to the premixing tank: conductive carbon: 2.20 kg, sodium carboxymethyl cellulose: 1.96 kg, graphite: 211.33 kg, the high mixing speed is set to 25 rpm, and the mixing time is 15 min to obtain a uniformly mixed dry powder.

[0011] Further, step S2 includes the following steps: Step S2.1: Add 137.2 kg of deionized water to the circulation tank as a solvent base; Step S2.2: Start the circulation pump and disperse for 40 minutes; Step S2.3: Open the rotary valve and the feeding screw to mix the powder and liquid until the powder feeding is finished; keep the cooling water on throughout this process.

[0012] Furthermore, in step S3, after the powder-liquid mixing is completed, the slurry enters the single-cycle dispersion process: maintaining the circulation pump flow rate at 60L / min and the dispersion linear velocity at 21m / s, circulating and dispersing for 20min to complete the initial dispersion.

[0013] Further, in step S4, butanediol and PAA 35kg are added to the slurry and then circulated and dispersed: the circulation pump flow rate is 60L / min, the dispersion linear velocity is 21m / s, and the circulation and dispersion lasts for 20min.

[0014] Further, in step S5, after adding 5 kg of SBR binder, a circulating dispersion process is carried out: the circulation pump flow rate is adjusted to 30 L / min, the dispersion linear velocity is adjusted to 5 m / s, and the circulation dispersion is carried out for 15 min; after slurry formation, the buffer tank is vacuum treated to complete the slurry preparation.

[0015] Furthermore, in step S5, the buffer tank is vacuum treated in the following manner: vacuum time ≥ 60 min, vacuum degree ≤ -85 kPa, and stirring speed 20 rpm.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Adapting to high solids content powder and ensuring continuous production: Through the synergistic effect of high dispersion linear velocity and small flow circulation, the slurry accumulation and agglomeration under high solids content powder conditions are avoided, and the problems of equipment torque soaring and frequent overload alarm shutdown are solved, so as to achieve stable slurry preparation under high solids content powder and ensure continuous production. (2) Dynamically adapt to viscosity fluctuations and avoid sudden jamming: Establish a load-linked powder feeding speed control mechanism to realize real-time adaptation of feeding parameters and instantaneous slurry viscosity fluctuations, solve the problems of traditional processes without dynamic load adjustment, easy to cause instantaneous torque overload and sudden jamming, and extend the service life of equipment.

[0017] (3) It greatly improves production efficiency and saves pulping time: Through the three-in-one collaborative technical solution of source solid content control, dispersion parameter optimization and torque linkage dynamic speed regulation, the pulping time is controlled at 110 min, which saves 80 min compared with the traditional wet circulating high-efficiency pulping process.

[0018] (4) Solve the problem of low solid content and improve production efficiency: Increase the solid content of the powder to 58%-61% and control the solid content of the output to 53-56%, effectively solve the defects of low solid content of powder and output in the existing process, reduce the load of subsequent concentration process, shorten the production cycle, improve pulping production efficiency, and meet the needs of industrial high-efficiency production.

[0019] (5) Strong process compatibility and easy to promote: This invention does not require hardware modification of the existing circulating pulping machine. The above technical effects can be achieved by optimizing the process parameters. It is compatible with the existing negative electrode homogenization production line and has good industrial application prospects. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the method flow provided in an embodiment of the present invention; Figure 2 This is a schematic diagram showing the load conditions of the circulating high-efficiency pulping machine in an embodiment of the present invention; Figure 3 This is a schematic diagram of the load condition of the circulating high-efficiency pulping machine in Comparative Example 1 of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Example This invention uses graphite as the active material, sodium carboxymethyl cellulose and conductive carbon as additives, and SBR as a binder. A circulating high-efficiency pulping machine is used to complete the homogenization process. The process flow diagram is shown below. Figure 1 As shown, the specific steps include the following: Step S1: Powder premixing. The following materials are added sequentially to the premixing tank: conductive carbon: 2.20 kg (tolerance ±0.01 kg), sodium carboxymethyl cellulose: 1.96 kg (tolerance ±0.01 kg), graphite: 211.33 kg (tolerance ±0.42 kg). The high-speed mixing chamber is set to 25 rpm, and the mixing time is 15 min to obtain a uniformly mixed dry-based powder. Step S2: Powder-liquid mixing and dispersion, including the following steps: Step S2.1: Add 137.2 kg (tolerance ±0.27 kg) of deionized water to the circulation tank as a solvent base; Step S2.2: Start the circulation pump, set the circulation pump flow rate to 60 L / min, the dispersion linear velocity to 21 m / s, and the dispersion time to 40 min; Step S2.3: Open the rotary valve and feed screw, set the powder feeding speed (rotary valve 4 r / min, feed coefficient 12 r / min), and mix the powder and liquid until the powder feeding is complete; during this stage, control the slurry solid content to 61%; when the equipment torque reaches 70%, immediately reduce the rotary valve speed to 2 r / min and the feed coefficient to 6 r / min to reduce the powder feed rate and relieve torque pressure until the torque is maintained below 65%. Keep the cooling water running throughout this process to avoid the risk of sodium carboxymethyl cellulose failure due to slurry overheating.

[0023] Step S3: Homogenize the powder-liquid mixture. After the powder-liquid mixture is completed, the slurry enters the single-circulation dispersion process: maintain the circulation pump flow rate at 60 L / min and the dispersion linear velocity at 21 m / s, and circulate for 20 min to complete the initial dispersion.

[0024] Step S4: Additives and viscosity optimization. Add 0.85 kg (tolerance ±0.01 kg) of butanediol and 35 kg (tolerance ±0.10 kg) of PAA to the slurry and then perform circulation dispersion: circulation pump flow rate 60 L / min, dispersion linear velocity 21 m / s, circulation dispersion for 20 min.

[0025] Step S5: Adding binder and final treatment. After adding 5 kg of SBR binder (tolerance ±0.01 kg), a circulation dispersion process is carried out: the circulation pump flow rate is adjusted to 30 L / min, the dispersion linear velocity is adjusted to 5 m / s, and the circulation dispersion is carried out for 15 min; after slurry formation, the buffer tank is vacuum treated: vacuum time ≥60 min, vacuum degree ≤-85 Kpa, stirring speed 20 rpm, to complete the slurry preparation.

[0026] In this embodiment, no equipment torque over-limit alarms, jamming, or material blockage occurred during the powder feeding process, and the torque was consistently maintained below 70%, the slurry temperature was ≤50℃, and the load condition of the circulating high-efficiency pulper was as follows. Figure 2 As shown, the slurry viscosity is 5520 mPa·s, the solid content is 56%, and the fineness is 27 μm, all within the process requirements. This effectively solves the problems of equipment jamming and slurry overheating caused by high solid content powder discharge in circulating pulpers.

[0027] Comparative Example 1 The homogenization process of the negative electrode slurry in this comparative example is the same as that in the embodiment, except that in step 2, the slurry solid content is designed to be 58%, the dispersion linear velocity is 18 m / s, the circulation pump flow rate is 80 L / min, and the rotary valve speed is maintained at 4 r / min and the feeding coefficient is 12 r / min during the powder feeding process. Specifically, it includes the following steps: Step S1: Powder premixing. Add the following materials sequentially to the premixing tank: conductive carbon: 2.20 kg (tolerance ±0.01 kg), sodium carboxymethyl cellulose: 1.96 kg (tolerance ±0.01 kg), graphite: 211.33 kg (tolerance ±0.42 kg). Set the high-speed mixing chamber to 25 rpm and the mixing time to 15 min to obtain a uniformly mixed dry powder.

[0028] Step S2: Initial dispersion of powder and liquid mixture.

[0029] Step S2.1: Add 159 kg (tolerance ±0.32 kg) of deionized water to the circulation tank as a solvent base; Step S2.2: Start the circulation pump, set the circulation pump flow rate to 80 L / min and the dispersion linear velocity to 18 m / s; Step S2.3: Open the rotary valve and feed screw, set the powder feeding speed (rotary valve 4 r / min, feed coefficient 12 r / min), and mix the powder and liquid until the powder feeding is completed; during this stage, control the slurry solid content to be 58%; during the powder feeding process, maintain the rotary valve speed at 4 r / min and the feed coefficient at 12 r / min. Throughout this process, maintain the temperature control at 25℃ when the cold water valve is open and at 20℃ when the cold water valve is closed.

[0030] Step S3: Homogenize the powder-liquid mixture. After the powder-liquid mixture is completed, the slurry enters the single-circulation dispersion process: maintain the circulation pump flow rate at 60 L / min and the dispersion linear velocity at 21 m / s, and circulate for 20 min to complete the initial dispersion.

[0031] Step S4: Additives and viscosity optimization. Add 0.85 kg (tolerance ±0.01 kg) of butanediol and 35 kg (tolerance ±0.10 kg) of PAA to the slurry and then perform circulation dispersion: circulation pump flow rate 60 L / min, dispersion linear velocity 21 m / s, circulation dispersion for 20 min.

[0032] Step S5: Adding binder and final treatment. After adding 5 kg of SBR binder (tolerance ±0.01 kg), a circulation dispersion process is carried out: the circulation pump flow rate is adjusted to 30 L / min, the dispersion linear velocity is adjusted to 5 m / s, and the circulation dispersion is carried out for 15 min; after slurry formation, the buffer tank is vacuum treated: vacuum time ≥60 min, vacuum degree ≤-85 Kpa, stirring speed 20 rpm, to complete the slurry preparation.

[0033] In this comparative example, when 33kg of powder remained in step 2, the equipment's torque reached 100% alarm, preventing the slurry in the dispersion chamber from being discharged and thus preventing the equipment from starting. Therefore, steps S3 / S4 / S5 were not continued. The load condition of the circulating high-efficiency pulping machine is as follows: Figure 3 As shown.

[0034] Comparative Example 2 The homogenization process of the negative electrode slurry in this comparative example is the same as that in the embodiment, the powders are mixed in step S1 and then mixed with liquid in step S2. In comparative example 2, to avoid excessive equipment load, in step S1, 10% graphite is first mixed with all other powders and then initially dispersed with all liquids. After dispersion, a conductive adhesive with 14% solids content is obtained. Then, the remaining 90% graphite is added a second time and mixed and dispersed with the conductive adhesive. The specific steps include the following: Step S1: Powder premixing. Add the following materials sequentially to the premixing tank: conductive carbon: 2.20 kg (tolerance ±0.01 kg), sodium carboxymethyl cellulose: 1.96 kg (tolerance ±0.01 kg), graphite: 21.133 kg (tolerance ±0.04 kg). Set the high-speed mixing chamber to 25 rpm and the mixing time to 15 min to obtain a uniformly mixed dry powder.

[0035] Step S2: Initial dispersion of powder and liquid mixture.

[0036] Step S2.1: Add 159 kg (tolerance ±0.32 kg) of deionized water to the circulation tank as a solvent base; Step S2.2: Start the circulation pump, set the circulation pump flow rate to 80 L / min, the dispersion linear velocity to 21 m / s, and the dispersion time to 60 min; Step S2.3: Open the rotary valve and feed screw, set the powder feeding speed (rotary valve 4 r / min, feed coefficient 12 r / min), and mix the powder and liquid until the powder feeding is completed; during this stage, control the slurry solid content to be 15.8%; during the powder feeding process, maintain the rotary valve speed at 4 r / min and the feed coefficient at 12 r / min. Throughout this process, maintain the temperature control at 25℃ when the cold water valve is open and at 20℃ when the cold water valve is closed.

[0037] Step S3: Secondary powder-liquid mixing and initial dispersion.

[0038] Step S3.1: Add the remaining 190 kg of graphite to the premixing chamber and begin feeding the powder; Step S3.2: Start the circulation pump, set the circulation pump flow rate to 80 L / min, the dispersion linear velocity to 21 m / s, and the dispersion time to 60 min; Step S3.3: Open the rotary valve and feed screw, set the powder feeding speed (rotary valve 4 r / min, feed coefficient 12 r / min), and mix the powder and liquid until the powder feeding is completed; during this stage of powder feeding, the slurry solid content is 57.5%; during the powder feeding process, maintain the rotary valve speed at 4 r / min and the feed coefficient at 12 r / min. Throughout this process, maintain the temperature control at 25℃ when the cold water valve is open and at 20℃ when the cold water valve is closed.

[0039] Step S4: Homogenize the powder-liquid mixture. After the powder-liquid mixture is mixed, the slurry enters a single-circulation dispersion process: maintain the circulation pump flow rate at 60 L / min and the dispersion linear velocity at 21 m / s, and circulate for 20 min to complete the initial dispersion.

[0040] Step S5: Additives and viscosity optimization. Add 0.85 kg (tolerance ±0.01 kg) of butanediol and 35 kg (tolerance ±0.10 kg) of PAA to the slurry and then perform circulation dispersion: circulation pump flow rate 60 L / min, dispersion linear velocity 21 m / s, circulation dispersion for 20 min.

[0041] Step S6: Adding binder and final treatment. After adding 5 kg of SBR binder (tolerance ±0.01 kg), a circulation dispersion process is carried out: the circulation pump flow rate is adjusted to 30 L / min, the dispersion linear velocity is adjusted to 5 m / s, and the circulation dispersion is carried out for 15 min; after slurry formation, the buffer tank is vacuum treated: vacuum time ≥60 min, vacuum degree ≤-85 Kpa, stirring speed 20 rpm, to complete the slurry preparation.

[0042] In this comparative example, no equipment torque over-limit alarm, jamming, or material blockage occurred during the powder feeding process, and the torque was always maintained below 70%. The slurry temperature was ≤50℃. The parameters are compared with those of the example and Comparative Example 1, as shown in Table 1. The slurry viscosity was 4300 mPa·s, the solid content was 52.6%, and the fineness was 29 μm, all within the process requirements. However, the pulping time was as high as 190 min, while the pulping time of the example can be reduced by 80 min.

[0043] Table 1

[0044] Finally, it should be noted that the above embodiments are merely illustrative and explanatory of the present invention, and are not intended to limit the present invention to the scope of the described embodiments. Furthermore, those skilled in the art will understand that the present invention is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of the present invention, all of which fall within the scope of protection claimed by the present invention.

Claims

1. A method for homogenizing lithium battery negative electrode slurry based on a circulating high-efficiency pulping machine, used for dry pulping of lithium battery negative electrode, characterized in that, Includes the following steps: Step S1: Powder premixing step; Step S2: Powder-liquid mixing and dispersion step; In step S2, the following settings are made: (1) Dispersion linear velocity The flow rate of the circulating pump is 21m / s-23m / s. satisfy: ; (2) The real-time torque of the main shaft of the dispersing mechanism of the circulating high-efficiency pulper The critical threshold is the powder feeding speed. The formula for segmented automatic control is: ;in, Used as the baseline powder feeding speed; (3) By controlling the dispersion linear velocity and cold water temperature Controlling slurry temperature The formula is as follows: Among them, the temperature of cold water Temperature: 7℃-10℃; Step S3: Powder-liquid homogenization and circulation dispersion step; Step S4: Additive dispersing step; Step S5: Adhesive addition and final vacuum treatment; The method also includes real-time calculation of the blockage coefficient. and according to The steps for processing; The calculation formula is as follows: ;when When the operating condition is determined to be in a safe and stable state, with no risk of material blockage or machine jamming; when When an abnormal operating condition is detected, the parameter adjustment mechanism is automatically triggered, and the feeding speed is reduced to... Revert to a safe range.

2. The method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 1, characterized in that, The It is 70%.

3. The method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 2, characterized in that, In step S2, the following settings are also made: the initial solid content of the powder feeding stage is 58%-61%, and the solid content of the output is 53%-56%.

4. The method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 3, characterized in that, When the real-time torque of the main shaft of the dispersing mechanism of the circulating high-efficiency pulping machine... At this time, it is determined that the load of the dispersing mechanism is normal, and the benchmark powder feeding speed is maintained. =10kg / min powder feeding, corresponding to a rotary valve reference speed of 4r / min and a feed screw reference speed of 12r / min; when the real-time torque of the main shaft of the dispersing mechanism of the circulating high-efficiency pulper is... If the dispersing mechanism is deemed overloaded, the powder feeding speed will be halved. Simultaneously, the rotary valve speed was reduced to 2 r / min and the feed screw speed was reduced to 6 r / min.

5. The method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 4, characterized in that, In step S1, the following materials are added sequentially to the premix tank: conductive carbon: 2.20 kg, sodium carboxymethyl cellulose: 1.96 kg, graphite: 211.33 kg, the high mixing speed is set to 25 rpm, and the mixing time is 15 min to obtain a uniformly mixed dry powder.

6. The method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 5, characterized in that, Step S2 includes the following steps: Step S2.1: Add 137.2 kg of deionized water to the circulation tank as a solvent base; Step S2.2: Start the circulation pump and disperse for 40 minutes; Step S2.3: Open the rotary valve and the feeding screw to mix the powder and liquid until the powder feeding is finished; keep the cooling water on throughout this process.

7. The method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 6, characterized in that, In step S3, after the powder-liquid mixing is completed, the slurry enters the single-cycle dispersion process: maintaining the circulation pump flow rate at 60L / min and the dispersion linear velocity at 21m / s, circulating and dispersing for 20min to complete the initial dispersion.

8. The method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 7, characterized in that, In step S4, butanediol and PAA 35kg are added to the slurry and then circulated and dispersed: the circulation pump flow rate is 60L / min, the dispersion linear velocity is 21m / s, and the circulation and dispersion lasts for 20min.

9. A method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 8, characterized in that, In step S5, after adding 5 kg of SBR binder, a circulating dispersion process is carried out: the circulation pump flow rate is adjusted to 30 L / min, the dispersion linear velocity is adjusted to 5 m / s, and the circulation dispersion is carried out for 15 min; after slurry formation, the buffer tank is vacuum treated to complete the slurry preparation.

10. A method for homogenizing lithium battery negative electrode based on a circulating high-efficiency pulping machine according to claim 9, characterized in that, In step S5, the buffer tank is vacuum treated in the following manner: vacuum time ≥ 60 min, vacuum degree ≤ -85 kPa, stirring speed 20 rpm.

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