Equipment for preparing high-combination-degree lithium battery silicon-carbon negative electrode material and preparation method of high-combination-degree lithium battery silicon-carbon negative electrode material

Abstract

The invention belongs to the technical field of preparation of lithium ion battery silicon-carbon negative electrode materials, and relates to equipment for preparing a high-combination-degree lithium battery silicon-carbon negative electrode material and a preparation method, the equipment comprises a mixing tower, a plurality of mixing areas are arranged in the mixing tower, a feeding device is arranged at the top of the mixing tower, and a discharging device is arranged at the bottom of the mixing tower. A batching box communicated with the mixing area is arranged on one side of the mixing area, and a discharging pipe and a guide plate matched with the discharging pipe are mounted at the bottom of the mixing area. The device is easy to operate and convenient to use, different steps of the carbon-silicon material can be conveniently operated at the same time, the operation conditions can be adjusted, and people can conveniently use the device.

Description

Technical Field

[0001] The present invention relates to the field of equipment for preparing negative electrode materials for lithium batteries, and in particular to equipment and a method for preparing silicon-carbon negative electrode materials for lithium batteries with high bonding strength. Background Art

[0002] With the rapid development of the economy, the global energy situation is becoming increasingly severe. The demand for traditional disposable energy such as coal and oil continues to increase, and at the same time, the damage to the global ecological environment is also intensifying. Therefore, the development and application of clean, low-carbon, environmentally friendly and renewable energy has become a topic that mankind urgently needs to explore together. With the development of energy storage technology, the application of renewable energy such as wind energy and solar energy has been greatly improved. At present, lithium-ion batteries, which are the most popular energy storage batteries, have been widely used in portable electronic devices such as notebooks and smartphones. However, in order to realize the application of lithium-ion batteries in environmentally friendly, clean and pollution-free new energy vehicles, it is extremely urgent to develop a new generation of lithium-ion batteries with high energy, high power density and high safety performance. Due to its high lithium storage capacity and abundant resources, silicon materials are considered to be one of the ideal candidate materials for the development of a new generation of lithium-ion battery negative electrode materials with high specific energy and high power density.

[0003] The preparation of existing lithium battery silicon-carbon negative electrode materials is generally carried out through multiple devices. During the operation, the materials need to be transferred between the various devices. The operation is cumbersome and easily leads to waste of resources. Therefore, there is an urgent need to provide a device for preparing high-binding silicon-carbon negative electrode materials for lithium batteries. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of existing lithium battery silicon-carbon negative electrode materials, which are generally prepared by multiple devices, and require material transfer between each device during operation, which is cumbersome and easily leads to waste of resources. A device and preparation method for preparing high-binding silicon-carbon negative electrode materials for lithium batteries are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for preparing high-binding silicon-carbon negative electrode materials for lithium batteries, the device comprising a mixing tower, wherein a plurality of mixing zones are provided in the mixing tower, a feeding device is provided at the top of the mixing tower, a batching box connected to the mixing zone is provided on one side of the mixing zone, and a discharge pipe and a guide plate cooperating with the discharge pipe are installed at the bottom of the mixing zone.

[0007] By setting up multiple mixing zones, materials can be mixed in stages or layers to ensure that the materials are mixed more evenly and fully. This regional mixing method helps to improve mixing efficiency, making the composition distribution of the final product more uniform, thereby improving battery performance. The batching box set on one side of each mixing zone allows for precise metering and addition of materials required for different mixing stages. This helps to accurately control the composition ratio of silicon-carbon negative electrode materials and ensure the consistency of quality and performance of each batch of products. The discharge pipe and guide plate design installed at the bottom of the mixing zone help to optimize the flow path of the material and prevent the material from being blocked or accumulated during the mixing process. The mutual cooperation between the guide plate and the discharge pipe can guide the material to transfer smoothly from one mixing zone to the next processing stage, ensuring the continuity and efficiency of the mixing process. The parallel operation of multiple mixing zones also further shortens the production cycle and improves overall production capacity.

[0008] Preferably, the batching box and the mixing zone are connected through a conduit at the bottom of the batching box, a material passing mechanism is provided on the batching box, a rotating rod is provided inside the mixing tower, the material passing mechanism is transmission-connected to the rotating rod, the material passing mechanism includes a guide rod, the guide rod is slidably mounted on the batching box, a stopper is slidably connected to the bottom inner wall of the mixing zone, the stopper is fixedly connected to the corresponding guide rod, and the guide rod and the conduit cooperate with each other.

[0009] Through the transmission connection between the material feeding mechanism and the rotating rod, the guide rod can be controlled by rotating the rotating rod to slide, thereby controlling the position of the stopper. The interaction between the stopper and the guide tube can precisely control the timing and flow rate of material flowing from the batching box through the guide tube into the mixing zone, ensuring the accuracy and timeliness of material addition and facilitating the optimization of mixing results.

[0010] Preferably, a first motor is fixedly installed on the top of the mixing tower, a rotating rod is fixedly installed on the output shaft of the first motor, a plurality of stirring rods are fixedly installed on the rotating rod, a second motor and a positioning seat are fixedly installed on one side of the mixing tower, an active rod is rotatably connected to the positioning seat, the active rod is fixedly connected to the output shaft of the second motor, a plurality of cams are fixedly installed on the rotating rod, the cams and corresponding blocks cooperate with each other, and a sliding groove is provided at the bottom of the mixing zone, a sliding rod is fixedly installed on the inner wall of the sliding groove, a moving block is slidably connected to the sliding rod, the moving block is fixedly connected to the stop block, and a return spring is fixedly installed on one side of the moving block, and one end of the return spring is fixedly connected to the inner wall of the sliding groove.

[0011] The first motor drives the rotating rod to rotate, and the multiple stirring rods on the rod rotate accordingly, efficiently stirring and mixing the materials in the mixing zone. This structure ensures that the materials are thoroughly mixed in the mixing zone, improving mixing efficiency and uniformity, and facilitating the production of high-quality, highly bonded silicon-carbon negative electrode materials for lithium batteries. The second motor drives the active rod to rotate, which, through the interaction of a cam and a stopper, controls the upward and downward movement of the stopper within the sliding groove. This structure enables automated control of material flow, allowing flexible adjustment of the timing and amount of material addition according to production needs, further improving production efficiency and product quality. The combination of the sliding groove, sliding rod, moving block, and return spring provides stable and reliable support and guidance for the stopper. This structure not only ensures the stability and accuracy of the stopper during movement, but also, through the elastic action of the return spring, enables automatic reset of the stopper, improving the reliability and service life of the equipment. The coordinated operation of the first and second motors enables precise control of material mixing and flow.

[0012] Preferably, heating plates are fixedly installed on the inner walls of both sides of the mixing zone, a first valve is provided on the feed pipe, a distribution pipe is installed on one side of the mixing zone, a second valve is provided on the distribution pipe, and a discharge pipe is installed at the bottom of the mixing tower.

[0013] Heating plates installed on the inner walls of the mixing zone heat the materials within, ensuring they maintain the appropriate temperature during mixing, helping to improve mixing efficiency and product quality. The first valve on the feed pipe and the second valve on the distribution pipe flexibly control the flow path and timing of the materials. By opening or closing these valves, the transfer of materials between the different mixing zones and their final discharge from the mixing tower can be precisely controlled.

[0014] Preferably, a transmission mechanism is provided on the outside of the mixing tower, and the transmission mechanism includes multiple external gear rings, which are rotatably installed on the outside of the mixing tower, and multiple driving gears are fixedly installed on the active rod, and the driving gears are meshed with the corresponding external gear rings.

[0015] The transmission mechanism's design meshes the active gear on the active rod with the outer ring gear, causing the outer ring gear to rotate outside the mixing tower. This rotational motion not only increases the mixing force of materials within the mixing tower but also promotes even distribution within the mixing zone, thereby enhancing mixing efficiency. The rotation of the outer ring gear also promotes material flow within the mixing zone, helping to prevent accumulation and dead spots during the mixing process.

[0016] Preferably, a ventilation mechanism is provided in the mixing zone, and the transmission mechanism is in transmission connection with the ventilation mechanism; the ventilation mechanism includes two air guide boxes, and air guide boxes are installed on both sides of the mixing zone, and a fixing rod is fixedly installed on the inner wall of the air guide box, and a positioning shaft is rotatably connected to the fixing rod, and fan blades are fixedly installed on the positioning shaft; two dustproof nets are installed on the inner wall of the air guide box, and the dustproof nets cooperate with the corresponding fan blades.

[0017] The ventilation mechanism generates airflow through the rotation of the fan blades, which helps improve air circulation in the mixing zone. This not only promotes the uniform distribution of materials during the mixing process, but also makes the airflow in the mixing zone more stable, helping to reduce material splashing and accumulation caused by airflow fluctuations. It also reduces the humidity and temperature gradients in the mixing zone, thereby improving mixing efficiency and product quality. Because the transmission mechanism is connected to the ventilation mechanism, the rotational power of the active rod can be used to drive the fan blades to rotate, without the need for an additional power source. The dust screen installed on the inner wall of the air guide box can effectively block external dust and impurities from entering the mixing zone, thereby preventing material contamination.

[0018] Preferably, multiple air guide boxes on the same side are rotatably connected to the same transmission rod, multiple first bevel gears are fixedly mounted on the transmission rod, a second bevel gear is fixedly mounted on the positioning shaft, and the first bevel gears and the second bevel gears are meshed with each other.

[0019] By rotating multiple air guide boxes on the same side and connecting them to a common drive rod, and utilizing the meshing relationship between the first and second bevel gears, multiple fan blades can be driven simultaneously. This design simplifies the transmission structure and reduces the number of transmission components, thereby reducing equipment complexity and maintenance costs.

[0020] Preferably, a connecting box is connected to the positioning shaft, and the connecting box is rotatably connected to the corresponding transmission rod; a plurality of driven gears are fixedly mounted on the transmission rod, and the outer gear ring is meshed with the corresponding two driven gears.

[0021] The connecting box design provides a secure connection point between the positioning shaft and the transmission rod. By enhancing structural stability and optimizing power transmission, the connecting box reduces wear and damage caused by vibration, friction, and other factors during operation. The meshing of multiple driven gears fixed to the transmission rod with the external gear ring ensures a more stable and efficient transmission.

[0022] Preferably, the outer side of the mixing tower is provided with multiple annular grooves, with two positioning blocks slidably connected to the inner walls of each groove. The positioning blocks are fixedly connected to the corresponding outer gear rings. The cooperation between the annular grooves and the positioning blocks allows the outer gear rings to be more securely mounted on the outer side of the mixing tower. This structure not only improves the installation precision of the outer gear rings but also enhances the stability of the entire transmission mechanism, ensuring the reliability and safety of the equipment during high-speed operation.

[0023] The present invention also provides a method for preparing a silicon-carbon negative electrode material for a lithium battery, using the above-mentioned device, the method comprising the following steps:

[0024] Nano-silicon powder and a base liquid containing stearic acid are introduced into a mixing tower through a feeding device, and isopropyl alcohol is introduced into the mixing zone through a batching box;

[0025] The raw materials are stirred, mixed and heated. After sufficient reaction, the reacted materials are discharged through a guide plate and a discharge pipe to obtain a lithium battery silicon-carbon negative electrode material.

[0026] Different raw materials are introduced into the mixing tower separately through the feed device and the batching box, allowing for staged or layered mixing, ensuring more uniform and thorough mixing. The discharge pipe and guide plate installed at the bottom of the mixing zone ensure smooth material discharge, reducing blockage and residue, and improving production efficiency. During the discharge process, the guide plate and discharge pipe help maintain material uniformity, preventing stratification or separation, and ensuring consistent product quality.

[0027] Beneficial effects

[0028] This solution is equipped with multiple mixing zones and multiple batching boxes, so that the materials can be added and mixed at different preparation steps, and can be processed separately. Different processing conditions can be applied to different steps, and this structure can improve the processing efficiency by 400%.

[0029] Due to the mutual cooperation between the cam and the stopper, and under the action of the return spring and the moving block, the guide rod can be driven to move back and forth. The moving guide rod can clear the ingredients on the conduit, which can prevent the ingredients or reactants in the ingredient box from being blocked, affecting the processing quality of the silicon-carbon negative electrode material of the lithium battery;

[0030] Due to the mutual engagement between the outer gear ring and the driven gear, and the mutual engagement between the first bevel gear and the second bevel gear, the rotating outer gear ring can drive multiple positioning shafts to rotate, and then drive the fan blades to air-dry the carbon-silicon negative electrode material in the mixing tower.

[0031] The present invention solves the problem of low efficiency caused by the current step-by-step synthesis of silicon-carbon negative electrodes through integrated equipment. At the same time, it includes multiple groups of mixing tower structures, which increases the degree of contact between materials in the reaction process and makes the materials more evenly mixed. Traditional silicon-carbon negative electrodes have repeated heating and cooling processes during the circulation process, and there is an oxidation risk in the material flow process. The integrated design can reduce the problem of contact between the process products and the external environment, so that the prepared products have the characteristics of high binding degree. The present invention is simple to operate and easy to use. It can facilitate the simultaneous operation of different steps of carbon-silicon materials and can adjust the operating conditions for easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the front cross-sectional structure of an apparatus for preparing a high-binding silicon-carbon negative electrode material for lithium batteries proposed in the present invention;

[0033] Figure 2 This is a schematic side cross-sectional structural diagram of an apparatus for preparing a high-binding silicon-carbon negative electrode material for lithium batteries proposed in the present invention;

[0034] Figure 3 This is a schematic diagram of a top-view cross-sectional structure of an apparatus for preparing a high-binding silicon-carbon negative electrode material for lithium batteries proposed in the present invention;

[0035] Figure 4 This is a side structural schematic diagram of an apparatus for preparing a high-binding silicon-carbon negative electrode material for lithium batteries proposed in the present invention;

[0036] Figure 5 This is a schematic structural diagram of part A of an apparatus for preparing a high-binding silicon-carbon negative electrode material for lithium batteries proposed in the present invention;

[0037] Figure 6 This is a schematic structural diagram of part B of an apparatus for preparing a high-bonding silicon-carbon negative electrode material for lithium batteries proposed in the present invention.

[0038] In the figure: 1. Mixing tower; 2. Mixing zone; 3. Feed hopper; 4. Discharge pipe; 5. First valve; 6. Distribution pipe; 7. Second valve; 8. Dispensing box; 9. Conduit; 10. Guide plate; 11. First motor; 12. Rotating rod; 13. Stirring rod; 14. Heating plate; 15. Discharge pipe; 16. Air guide box; 17. Fixing rod; 18. Positioning shaft; 19. Fan blade; 20. Dust screen; 21. Transmission rod ; 22. First bevel gear; 23. Second bevel gear; 24. Connecting box; 25. External gear ring; 26. Driven gear; 27. Second motor; 28. Active rod; 29. Active gear; 30. Positioning seat; 31. Annular groove; 32. Positioning block; 33. Stop block; 34. Sliding groove; 35. Sliding rod; 36. Moving block; 37. Return spring; 38. Cam; 39. Guide rod; 40. Support leg. DETAILED DESCRIPTION

[0039] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all the embodiments.

[0040] Example 1

[0041] Reference Figures 1-6 , a device for preparing high-binding silicon-carbon negative electrode materials for lithium batteries,

[0042] The equipment includes a mixing tower 1, which is provided with multiple mixing zones 2. A feed hopper 3 is fixedly installed on the top of the mixing tower 1, and multiple batching boxes 8 are fixedly installed on one side of the mixing tower 1. A conduit 9 is installed at the bottom of the batching box 8, and the conduit 9 cooperates with the corresponding mixing zone 2. Heating plates 14 are fixedly installed on the inner walls of both sides of the mixing zone 2. A discharge pipe 4 is installed at the bottom of the mixing zone 2, and a first valve 5 is provided on the discharge pipe 4. A distribution pipe 6 is installed on one side of the mixing zone 2, and a second valve 7 is provided on the distribution pipe 6. A guide plate 10 is installed on the inner wall of the bottom of the mixing zone 2, and the guide plate 10 cooperates with the corresponding discharge pipe 4. The bottom of the mixing tower 1 is provided with a discharge pipe 4. The material pipe 15 and the bottom of the mixing tower 1 are fixedly installed with four symmetrically arranged supporting legs 40, the top of the mixing tower 1 is fixedly installed with a first motor 11, the output shaft of the first motor 11 is fixedly installed with a rotating rod 12, and a plurality of stirring rods 13 are fixedly installed on the rotating rod 12. A material passing mechanism is provided on the material box 8, and the material passing mechanism is transmission-connected to the rotating rod 12. A second motor 27 and a positioning seat 30 are fixedly installed on one side of the mixing tower 1, and an active rod 28 is rotatably connected to the positioning seat 30, and the active rod 28 is fixedly connected to the output shaft of the second motor 27. A transmission mechanism is provided on the outside of the mixing tower 1, and a ventilation mechanism is provided in the mixing zone 2, and the transmission mechanism is transmission-connected to the ventilation mechanism.

[0043] In this embodiment, the material passing mechanism includes a guide rod 39, which is slidably mounted on the ingredient box 8, and a stopper 33 is slidably connected to the inner wall of the bottom of the mixing zone 2, and the stopper 33 is fixedly connected to the corresponding guide rod 39. The guide rod 39 cooperates with the conduit 9, and a plurality of cams 38 are fixedly mounted on the rotating rod 12, and the cams 38 cooperate with the corresponding stoppers 33. A sliding groove 34 is provided at the bottom of the mixing zone 2, and a sliding rod 35 is fixedly mounted on the inner wall of the sliding groove 34. A moving block 36 is slidably connected to the sliding rod 35, and the moving block 36 is fixedly connected to the stopper 33, and a return spring 37 is fixedly mounted on one side of the moving block 36, and one end of the return spring 37 is fixedly connected to the inner wall of the sliding groove 34.

[0044] In this embodiment, the ventilation mechanism includes two air guide boxes 16, and air guide boxes 16 are installed on both sides of the mixing zone 2. A fixing rod 17 is fixedly installed on the inner wall of the air guide box 16, and a positioning shaft 18 is rotatably connected to the fixing rod 17, and a fan blade 19 is fixedly installed on the positioning shaft 18. Multiple air guide boxes 16 on the same side are rotatably connected to the same transmission rod 21, and multiple first bevel gears 22 are fixedly installed on the transmission rod 21. A second bevel gear 23 is fixedly installed on the positioning shaft 18, and the first bevel gear 22 and the second bevel gear 23 are meshed with each other. A connecting box 24 is connected to the positioning shaft 18, and the connecting box 24 is rotatably connected to the corresponding transmission rod 21. A plurality of driven gears 26 are fixedly installed on the transmission rod 21, and the outer gear ring 25 is meshed with the corresponding two driven gears 26. Two dustproof nets 20 are installed on the inner wall of the air guide box 16, and the dustproof nets 20 cooperate with the corresponding fan blades 19.

[0045] In this embodiment, the transmission mechanism includes a plurality of external gear rings 25, which are rotatably mounted on the outside of the mixing tower 1. A plurality of driving gears 29 are fixedly mounted on the active rod 28, and the driving gears 29 are meshed with the corresponding external gear rings 25. A plurality of annular grooves 31 are provided on the outside of the mixing tower 1, and two positioning blocks 32 are slidably connected to the inner walls of the annular grooves 31, and the positioning blocks 32 are fixedly connected to the corresponding external gear rings 25.

[0046] Working principle: during operation, the nano silicon powder is fed into the mixing tower 1 through the feed hopper 3, the first motor 11 switch is started, the output shaft of the first motor 11 drives the rotating rod 12 to rotate, the rotating rod 12 drives the stirring rod 13 to rotate, the rotating stirring rod 13 stirs and mixes the silicon powder in the mixing zone 2, and heats the silicon powder in the mixing zone 2 through the heating plate 14. When the next operation is required, the first valve 5 is opened, and the first valve 5 exports the silicon powder in the mixing zone 2 through the discharge pipe 4. At the same time, the ingredient box 8 can introduce different ingredients into different mixing zones 2, and the rotating rotating rod 12 cooperates with the cam 38 and the block 33, and drives the guide rod 39 to move back and forth under the action of the reset spring 37 and the moving block 36. The moving guide rod 39 clears the conduit 9 in the ingredient box 8 back and forth, thereby preventing the ingredient box 8 from When blockage occurs at the connection with the conduit 9 and it is necessary to export the silicon powder in advance, the corresponding second valve 7 is opened, and the second valve 7 exports the silicon powder in different mixing zones 2, which is convenient for operation. When the silicon powder in the mixing zone 2 needs to be air-dried, the second motor 27 switch is started, and the output shaft of the second motor 27 drives the active rod 28 to rotate. The active rod 28 drives the outer gear ring 25 to rotate through the mutual engagement of the active gear 29 and the outer gear ring 25. The outer gear ring 25 drives the driven gear 26 to rotate, and the driven gear 26 drives the transmission rod 21 to rotate. The transmission rod 21 drives the positioning shaft 18 to rotate through the mutual engagement of the first bevel gear 22 and the second bevel gear 23. The positioning shaft 18 drives the fan blades 19 to rotate. The rotating fan blades 19 form air flow, so that the silicon powder in the mixing zone 2 can be blown dry, which is convenient for later preparation.

[0047] Example 2

[0048] The difference between Example 2 and Example 1 is that a filtering mechanism is provided on the feed hopper 3. The setting of the filtering mechanism can facilitate filtering the incoming silicon powder, thereby facilitating improving the quality of the silicon-carbon negative electrode material of the lithium battery.

[0049] Example 3

[0050] A method for preparing a silicon-carbon negative electrode material for a lithium battery, using the device described in Example 1 or Example 2 as a mixing device, the method comprising the following steps:

[0051] S1: 10% wt nano-silicon powder and base liquid are introduced into a mixing tower 1 through a feed hopper 3, and 12% wt isopropyl alcohol is introduced into different mixing zones 2 through a batching box 8; the base liquid contains stearic acid;

[0052] S2: different areas are heated to different temperatures by the heating plate 14, the first motor 11 switch is started, the output shaft of the first motor 11 drives the rotating rod 12 to rotate, the rotating rod 12 drives the stirring rod 13 to rotate, the rotating stirring rod 13 stirs and mixes the silicon powder in the mixing area 2, and the silicon powder in the mixing area 2 is heated by the heating plate 14, the heating temperature is 120℃-150℃, the heating time is 10min-12min, when the next step is required, the isopropyl alcohol is heated to 350℃-4 00℃, stearic acid is heated to 320℃-350℃, and the first valve 5 is opened in sequence. The first valve 5 discharges the silicon powder in the mixing zone 2 through the discharge pipe 4. At the same time, the ingredient box 8 introduces different ingredients into multiple mixing zones 2. At the same time, the first motor 11 drives the rotating rod 12 to rotate at a speed of 200r / min. The rotating rod 12 drives the stirring rod 13 to stir the solution in the mixing zone 2. The processing time is: nano silicon powder 6min, isopropyl alcohol 3min, the rotating rotating rod 12 is connected to the gear through the cam 38. The blocks 33 cooperate with each other, and under the action of the return spring 37 and the moving block 36, the guide rod 39 is driven to move back and forth. The movable guide rod 39 clears the conduit 9 in the batching box 8 back and forth to prevent the connection between the batching box 8 and the conduit 9 from being blocked. When it is necessary to export in advance, the corresponding second valve 7 is opened, and the second valve 7 exports the silicon powder in the mixing zone 2, thereby facilitating operation. When the silicon powder in the mixing zone 2 needs to be air-dried, the second motor 27 switch is started, and the output shaft of the second motor 27 drives the main The movable rod 28 rotates, and the active rod 28 drives the outer gear ring 25 to rotate through the mutual engagement of the active gear 29 and the outer gear ring 25. The outer gear ring 25 drives the driven gear 26 to rotate, and the driven gear 26 drives the transmission rod 21 to rotate. The transmission rod 21 drives the positioning shaft 18 to rotate through the mutual engagement of the first bevel gear 22 and the second bevel gear 23. The positioning shaft 18 drives the fan blades 19 to rotate. The rotating fan blades 19 form an air flow, thereby being able to blow and dry the silicon powder in the mixing zone 2, which is convenient for later preparation;

[0053] S3: After mixing, 6.5% wt stearic acid was heated for 2 minutes to perform a mixing operation, and hot nitrogen was added to react;

[0054] S4: Finally, add 1.2%wt graphite, heat the graphite at 200℃-220℃ and mix it, and finally calcine it at 800℃ for 20 minutes, crush it, filter it and remove the magnetism, and form a silicon-carbon negative electrode material.

[0055] The above is only a preferred specific implementation method of this embodiment, but the protection scope of this embodiment is not limited to this. Any technician familiar with this technical field can make equivalent replacements or changes based on the technical solution and inventive concept of this embodiment within the technical scope disclosed in this embodiment, and they should be covered by the protection scope of this embodiment.

Claims

1. A device for preparing a high-binding silicon-carbon negative electrode material for lithium batteries, characterized in that: The equipment comprises a mixing tower (1), wherein a plurality of mixing zones (2) are provided in the mixing tower (1), a feeding device is provided at the top of the mixing tower (1), a batching box (8) in communication with the mixing zone (2) is provided on one side of the mixing zone (2), and a discharge pipe (4) and a guide plate (10) cooperating with the discharge pipe (4) are installed at the bottom of the mixing zone (2).

2. The device for preparing a high-binding silicon-carbon negative electrode material for lithium batteries according to claim 1, characterized in that: The batching box (8) and the mixing zone (2) are connected through a conduit (9) at the bottom of the batching box (8). A material passing mechanism is provided on the batching box (8). A rotating rod (12) is provided inside the mixing tower (1). The material passing mechanism is transmission-connected to the rotating rod (12). The material passing mechanism includes a guide rod (39). The guide rod (39) is slidably mounted on the batching box (8). A stopper (33) is slidably connected to the inner wall of the bottom of the mixing zone (2). The stopper (33) is fixedly connected to the corresponding guide rod (39). The guide rod (39) and the conduit (9) cooperate with each other.

3. The device for preparing a high-binding silicon-carbon negative electrode material for lithium batteries according to claim 1, characterized in that: A first motor (11) is fixedly mounted on the top of the mixing tower (1), a rotating rod (12) is fixedly mounted on the output shaft of the first motor (11), and a plurality of stirring rods (13) are fixedly mounted on the rotating rod (12). A second motor (27) and a positioning seat (30) are fixedly mounted on one side of the mixing tower (1), an active rod (28) is rotatably connected to the positioning seat (30), and the active rod (28) is fixedly connected to the output shaft of the second motor (27). A plurality of cams (38) are provided, the cams (38) cooperate with corresponding blocks (33), and a sliding groove (34) is provided at the bottom of the mixing zone (2). A sliding rod (35) is fixedly installed on the inner wall of the sliding groove (34), a moving block (36) is slidably connected to the sliding rod (35), the moving block (36) is fixedly connected to the block (33), and a return spring (37) is fixedly installed on one side of the moving block (36), and one end of the return spring (37) is fixedly connected to the inner wall of the sliding groove (34).

4. The device for preparing a high-binding silicon-carbon negative electrode material for lithium batteries according to claim 1, characterized in that: Heating plates (14) are fixedly mounted on the inner walls of both sides of the mixing zone (2), a first valve (5) is provided on the feed pipe (4), a distribution pipe (6) is installed on one side of the mixing zone (2), a second valve (7) is provided on the distribution pipe (6), and a discharge pipe (15) is installed at the bottom of the mixing tower (1).

5. The device for preparing a high-bonding silicon-carbon negative electrode material for lithium batteries according to claim 3, characterized in that: A transmission mechanism is provided on the outside of the mixing tower (1), the transmission mechanism comprising a plurality of external gear rings (25), the plurality of external gear rings (25) being rotatably mounted on the outside of the mixing tower (1), a plurality of driving gears (29) being fixedly mounted on the active rod (28), the driving gears (29) being meshed with the corresponding external gear rings (25).

6. The device for preparing a high-bonding silicon-carbon negative electrode material for lithium batteries according to claim 5, characterized in that: A ventilation mechanism is provided in the mixing zone (2), and the transmission mechanism is in transmission connection with the ventilation mechanism; the ventilation mechanism comprises two air guide boxes (16), each of which is installed on both sides of the mixing zone (2); a fixing rod (17) is fixedly installed on the inner wall of the air guide box (16), a positioning shaft (18) is rotatably connected to the fixing rod (17), and a fan blade (19) is fixedly installed on the positioning shaft (18); two dustproof nets (20) are installed on the inner wall of the air guide box (16), and the dustproof nets (20) cooperate with the corresponding fan blades (19).

7. The device for preparing a high-binding silicon-carbon negative electrode material for lithium batteries according to claim 6, characterized in that: The plurality of air guide boxes (16) on the same side are rotatably connected to a common transmission rod (21), a plurality of first bevel gears (22) are fixedly mounted on the transmission rod (21), a second bevel gear (23) is fixedly mounted on the positioning shaft (18), and the first bevel gears (22) and the second bevel gears (23) are meshed with each other.

8. The device for preparing a high-bonding silicon-carbon negative electrode material for lithium batteries according to claim 7, characterized in that: The positioning shaft (18) is connected to a connecting box (24), which is rotatably connected to a corresponding transmission rod (21); a plurality of driven gears (26) are fixedly mounted on the transmission rod (21), and an outer gear ring (25) is meshed with two corresponding driven gears (26).

9. The device for preparing a high-bonding silicon-carbon negative electrode material for lithium batteries according to claim 5, characterized in that: A plurality of annular slots (31) are provided on the outer side of the mixing tower (1), and two positioning blocks (32) are slidably connected to the inner walls of the annular slots (31), and the positioning blocks (32) are fixedly connected to corresponding outer gear rings (25).

10. A method for preparing a lithium battery silicon-carbon negative electrode material, characterized in that: Using the device according to any one of claims 1 to 9, the method comprises the following steps: Nano-silicon powder and a base liquid containing stearic acid are introduced into a mixing tower (1) through a feeding device, and isopropyl alcohol is introduced into a mixing zone (2) through a batching box (8); The raw materials are stirred, mixed and heated, and after sufficient reaction, the reacted materials are discharged through the guide plate (10) and the discharge pipe (4) to obtain the lithium battery silicon-carbon negative electrode material.

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