Preparation device and method of carbon nanotube coated porous silicon structure

Abstract

The invention discloses a preparation device and method of a carbon nanotube coated porous silicon structure, and relates to the technical field of battery materials, the preparation device comprises a main body and a processing mechanism fixed on the main body and used for reducing the particle size of a silicon-based material, the main body is provided with an annular screen and a baffle plate, the annular screen is rotatably connected to the main body, and the baffle plate is fixed on the main body. The processing mechanism is arranged in the annular screen; the baffle is rotationally connected to the annular screen, the baffle has a material blocking state and a discharging state when rotating along with the annular screen, and when the baffle is located below the processing mechanism, the baffle is in the material blocking state so as to drive unqualified materials to ascend. According to the preparation device and method for the carbon nano tube coated porous silicon structure, materials discharged from the treatment mechanism can be screened through the rotating annular screen, and unqualified materials ascend along with the baffle in the material blocking state till the baffle moves to the position above the treatment mechanism, and then the unqualified materials are put into the treatment mechanism again.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery materials, in particular to a preparation device and method of a carbon nanotube-coated porous silicon structure. BACKGROUND

[0002] The theoretical specific capacity of graphite is 372 mA·h / g (about 365), and the corresponding lithium ion battery energy density has limited space for improvement. Silicon-based negative electrode materials are the first choice for the next generation due to their high theoretical specific capacity (4200 mA·h / g at high temperature and 3580 mA·h / g at room temperature).

[0003] For example, a patent document with the name "Carbon nanotube reinforced carbon-coated porous silicon / alloy composite material and preparation" with the authorization announcement number CN118693272B and the authorization announcement date December 31, 2024, the preparation method of which includes: adding a precursor into softened pitch, stirring uniformly, then rolling into a thin sheet through a rolling machine, cooling, crushing, then high-temperature carbonization, ball milling, and sieving; finally, chemical vapor deposition. In the obtained carbon nanotube reinforced carbon-coated porous silicon / alloy composite material, the carbon-coated nanoporous silicon and the nanosilicon alloy are connected by carbon nanotubes and are uniformly dispersed in the carbon-coated shell; and the material has excellent electrochemical performance as a negative electrode material.

[0004] In the prior art, multiple crushing or grinding treatments are required when processing silicon-based materials, and there are particle size requirements during processing. Therefore, most crushing or grinding devices need to be used with a screen, and the unqualified materials screened out also need to be crushed or ground again. Obviously, the reprocessing of unqualified materials is cumbersome. SUMMARY

[0005] The application aims to provide a preparation device and method of a carbon nanotube-coated porous silicon structure to solve the above problems in the prior art.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: A preparation device of a carbon nanotube-coated porous silicon structure, comprising a main body and a processing mechanism for reducing the particle size of silicon-based materials and fixed on the main body, the main body is provided with: An annular screen is rotationally connected to the main body, and the processing mechanism is arranged in the annular screen; A baffle is rotationally connected to the annular screen, and the baffle has a blocking state and a discharging state when rotating with the annular screen. When the baffle is located below the processing mechanism, the baffle is in the blocking state to drive the unqualified materials to rise. After the baffle moves above the processing mechanism, the baffle switches to the discharging state to make the materials fall into the processing mechanism.

[0007] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that a circulating cavity is formed on the main body, and a ring-shaped screen is rotatably connected in the circulating cavity.

[0008] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that a ring-shaped fence is formed on the ring-shaped screen.

[0009] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that a gap is left between the outer wall of the ring-shaped screen and the inner wall of the circulating cavity.

[0010] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that a feeding port is formed on the top of the processing mechanism, and a discharging port is formed on the bottom of the processing mechanism.

[0011] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that a feeding channel is formed on the main body and communicates with the circulating cavity, the feeding channel extends into the feeding port, and a discharging port is formed on the bottom of the main body and communicates with the circulating cavity.

[0012] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that a brush roller is arranged in the ring-shaped screen, a connecting rod is hingedly connected to the end of the brush roller, the connecting rod is hingedly connected to the baffle, and a first elastic member is arranged between the connecting rod and the baffle.

[0013] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that when the baffle rises with the ring-shaped screen, the baffle switches to a material blocking state to drive the brush roller away from the baffle, thereby driving the material on the ring-shaped screen away from the baffle; with the rotation of the ring-shaped screen, the material again approaches the baffle under the action of gravity, and the material is repeatedly screened in this way.

[0014] The preparation device of the carbon nanotube coated porous silicon structure is characterized in that when the baffle rises above the processing mechanism, the baffle switches to a discharging state to drive the brush roller to approach the baffle, and at the same time, the brush roller can clean the ring-shaped screen.

[0015] A preparation method of a carbon nanotube coated porous silicon structure, which is based on any one of the preparation devices of the carbon nanotube coated porous silicon structure, comprises the following steps: S1, treating the silicon powder by grinding, acid washing and solvent cleaning to obtain silicon powder with uniform particle size and a particle size of less than 50 microns; S2, treating the silicon powder with a mixed acid of hydrofluoric acid, nitric acid, hydrochloric acid, sulfuric acid, hydrogen peroxide or a combination thereof to obtain porous silicon; S3, dispersing the carbon nanotube, mixing and stirring the carbon nanotube and the porous silicon, and finally passing the stirred mixed liquid through a long heating belt with a front plate until the solvent evaporates more than 80% to form a block structure; S4, the block structure in the above step is crushed by a crusher, and the crushed material is rolled in a roller for 2 hours; S5, the carbon nanotube, graphite, carbon black, carbon fiber, graphene oxide, porous carbon, pitch and other material combinations are coated by a coating machine; S6, finally, the product is formed through the processes of depolymerization, sintering, crushing, screening and magnetic removal.

[0016] In the above technical solution, the preparation device and method of the carbon nanotube coated porous silicon structure are provided. The rotating annular screen can screen the discharged material in the treatment mechanism, so that the material with a larger particle size is left in the screen. With the rotation of the screen, the unqualified material rises with the baffle in the blocking state. When the baffle moves to the top of the treatment mechanism, the baffle is switched to the discharging state, so that the unqualified material is re-put into the treatment mechanism. Thus, a cycle is formed to improve the efficiency of crushing or grinding the material to the target particle size. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments or prior art of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the present application. Other drawings can also be obtained by those skilled in the art according to these drawings.

[0018] Figure 1 The overall structure schematic diagram provided by the embodiment of the present application is provided. Figure 2 The feeding channel structure schematic diagram provided by another embodiment of the present application is provided. Figure 3 The brush roller structure schematic diagram provided by another embodiment of the present application is provided. Figure 4 The baffle structure schematic diagram provided by another embodiment of the present application is provided. Figure 5 The annular friction plate structure schematic diagram provided by another embodiment of the present application is provided. Figure 6 The arc-shaped limiting plate structure schematic diagram provided by another embodiment of the present application is provided. Figure 7 The stop block structure schematic diagram provided by another embodiment of the present application is provided.

[0019] Explanation of reference signs: 1, main body; 2, treatment mechanism; 3, annular screen; 4, baffle; 5, circulation cavity; 6, annular fence; 7, feeding channel; 8, discharge port; 9, brush roller; 10, connecting rod; 11, connecting shaft; 12, extension; 13, annular friction plate; 14, friction wheel; 15, arc-shaped limiting plate; 16, stop block; 17, connecting column. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Reference Figures 1-7 This invention provides a device for preparing a porous silicon structure coated with carbon nanotubes, including a main body 1 and a processing mechanism 2 fixed on the main body 1 for reducing the particle size of silicon-based materials. The main body 1 is provided with an annular screen 3 and a baffle 4. The annular screen 3 is rotatably connected to the main body 1, and the processing mechanism 2 is disposed inside the annular screen 3. The baffle 4 is rotatably connected to the annular screen 3. When the baffle 4 rotates with the annular screen 3, it has a material blocking state and a material discharging state. When the baffle 4 is below the processing mechanism 2, the baffle 4 is in the material blocking state to drive unqualified materials to rise. After the baffle 4 moves above the processing mechanism 2, the baffle 4 switches to the material discharging state so that the materials fall into the processing mechanism 2.

[0022] Specifically, the processing unit 2 can be a pulverizer or grinder from the existing technology to grind the silicon-based material to the required particle size range as needed. In the process of preparing carbon nanotube-coated porous silicon structures, the material needs to be processed through the processing unit 2 multiple times. Since most steps have requirements on the particle size of the material, a screen will be set up to work in conjunction with the processing unit 2. Obviously, the unqualified material on the screen needs to be processed in a centralized manner, which is quite cumbersome. The innovation of this invention lies in the following: an annular screen 3 and a baffle 4 are provided on the main body 1, and the processing mechanism 2 is placed inside the annular screen 3. The material discharged from the processing mechanism 2 is screened by the rotating annular screen 3 (the main body 1 is provided with a drive mechanism for rotating the annular screen 3, which is prior art and is not shown in the figure, so it will not be described in detail here). Qualified material is discharged outside the annular screen 3, while unqualified material remains inside the annular screen 3. During the rotation of the annular screen 3, the baffle 4, which is in the material blocking state, can rotate with the annular screen 3 and bring the unqualified material above the processing mechanism 2. Then, the baffle 4 switches to the discharge state (a rotating structure such as a motor can be provided on the annular screen 3 to drive the baffle 4 to rotate) so that the material is put back into the processing mechanism 2. In this way, a material processing cycle is formed, which maximizes the efficiency of material processing.

[0023] In still another embodiment of the present application, further, the main body 1 is provided with a circulating cavity 5, the annular screen 3 is rotatably connected in the circulating cavity 5, and the processing mechanism 2 is fixed on the inner wall of the circulating cavity 5. The annular screen 3 is provided with an annular fence 6. A gap is left between the outer wall of the annular screen 3 and the inner wall of the circulating cavity 5. Specifically, the outer wall of the processing mechanism 2 is fixed on the inner wall of the circulating cavity 5 through a fixing frame or the like, so that the processing mechanism 2 is stably located inside the annular screen 3; the annular screen 3 is integrally formed in a ring shape, and both sides thereof are provided with the annular fence 6, the inner diameter of the annular fence 6 is smaller than the inner diameter of the annular screen 3, so that the annular fence 6 can block the materials, and the materials falling down without being screened can be avoided as much as possible; the edge of the circumferential surface of the annular screen 3 and the side surface of the annular fence 6 are in contact with the circulating cavity 5 (that is, the annular screen 3 is rotatably connected with the circulating cavity 5 through the part), and a certain gap is left between the circumferential surface of the annular screen 3 and the inner wall of the circulating cavity 5, so that the qualified materials screened by the annular screen 3 can fall into the circulating cavity 5 and be concentrated and discharged.

[0024] Preferably, the processing mechanism 2 is provided with a feeding port at the top and a discharging port at the bottom. The main body 1 is provided with a feeding channel 7 communicating with the circulating cavity 5, the feeding channel 7 extends into the feeding port, and the main body 1 is provided with a discharging port 8 communicating with the circulating cavity 5 at the bottom. Specifically, the feeding channel 7 is formed at the top of one side of the main body 1, the width of the feeding port is greater than the width of the annular screen 3, so that the feeding channel 7 can extend into the feeding port without affecting the operation of the annular screen 3 and the like; the width of the discharging port is smaller than the width of the annular screen 3, so that the materials discharged from the discharging port can be prevented from falling outside the annular screen 3 as much as possible; the screened materials fall into the circulating cavity 5, and the discharging port 8 is formed at the bottom of the circulating cavity 5, so that the materials with qualified particle size can be discharged through the discharging port 8 under the action of gravity.

[0025] Further, the annular screen 3 is provided with a brush roller 9, the end of the brush roller 9 is hingedly connected with a connecting rod 10, the connecting rod 10 is hingedly connected with the baffle 4, and a first elastic member is arranged between the connecting rod 10 and the baffle 4. Specifically, the brush roller 9 is provided with a connecting shaft 11 along the axial direction thereof, the connecting shaft 11 is arranged on the annular fence 6, and the outer wall of the brush roller 9 is in contact with the inner wall of the annular screen 3; the connecting rod 10 is hingedly connected with the connecting shaft 11, and the connecting rod 10 is located on the side of the annular fence 6 away from the annular screen 3, so as to prevent the connecting rod 10 from interfering with the annular fence 6; a plurality of groups of the baffle 4 and the brush roller 9 are arranged in an annular array on the annular fence 6; in this embodiment, the first elastic member can be a torsion spring structure (not shown) in the prior art, so as to force the connecting rod 10 to be close to the baffle 4, thereby driving the connecting shaft 11 to be arranged on the annular fence 6; in the process of driving the baffle 4 to rotate through a motor or the like, the connecting rod 10 can drive the connecting shaft 11 to move along the annular fence 6, so as to clean the materials on the annular fence 6 through the brush roller 9.

[0026] With such an arrangement, in the process of the baffle 4 rising with the annular screen 3, the baffle 4 switches to the material blocking state to drive the brush roller 9 away from the baffle 4, so as to drive the material on the annular screen 3 away from the baffle 4; with the rotation of the annular screen 3, the material again approaches the baffle 4 under the action of gravity, so as to repeatedly screen the material. After the baffle 4 rises above the processing mechanism 2, the baffle 4 switches to the discharging state to drive the brush roller 9 to approach the baffle 4, and at the same time, the brush roller 9 can clean the annular screen 3. The advantage is that when the driving mechanism drives the annular screen 3 to rotate, the baffle 4 rises with the annular screen 3 to lift the material above the processing mechanism 2 (as shown in Figure 3 , the screen rotates counterclockwise, and the right baffle 4 drives the material to rise), in the process, the material first falls uniformly between the adjacent two baffles 4 through the discharging port, at this time, the material can be screened through the annular screen 3; with the rotation of the annular screen 3, the baffle 4 switches the state and drives the brush roller 9 to move, so as to drive the material away from the corresponding baffle 4 through the brush roller 9, in this process, the material can be screened again; with the rotation of the annular screen 3, the material approaches the corresponding baffle 4 under the action of gravity (the surface of the brush roller 9 is a brush structure, which has a gap for the material to pass through), in this process, the material can be screened again; until the baffle 4 moves to above the processing mechanism 2, the baffle 4 switches to the discharging state (as shown in Figure 4 , the right baffle 4 switches the state to the left position to complete the state switching), to put the unqualified material left on the annular screen 3 into the feeding port of the processing mechanism 2, and in this process, the brush roller 9 can approach the corresponding baffle 4 to clean the annular screen 3, so as to avoid the material left on the annular screen 3 as much as possible.

[0027] In another embodiment of the present application, as an alternative to the first elastic member forcing the connecting rod 10 to approach the baffle 4, preferably, the annular enclosure 6 is provided with a plurality of extensions 12, the plurality of extensions 12 are fixed with an annular friction plate 13, the end of the brush roller 9 is fixed with a friction wheel 14, the friction wheel 14 and the annular friction plate 13 are matched, and the first elastic member is used to force the connecting rod 10 to move away from the baffle 4. Specifically, the annular friction plate 13, the annular enclosure 6 and the annular screen 3 are coaxially arranged, the annular friction plate 13 is located on the side of the connecting rod 10 away from the annular enclosure 6, and interference between the structures is avoided as much as possible; the friction wheel 14 is located on the side of the connecting rod 10 away from the annular enclosure 6 and is fixed on the connecting shaft 11, the friction wheel 14 is in transmission connection with the outer wall of the annular friction plate 13; in this embodiment, the first elastic member can be a torsion spring structure (not shown) in the prior art, which is used to force the connecting rod 10 to move away from the baffle 4, so as to drive the connecting shaft 11 and the annular enclosure 6 to separate and drive the friction wheel 14 and the annular friction plate 13 to be in transmission connection (in this embodiment, the connecting shaft 11 does not interfere with the annular enclosure 6, but the outer wall of the brush roller 9 still contacts the annular screen 3), so that the connecting shaft 11 and the annular enclosure 6 are avoided to interfere, and in the process of moving of the brush roller 9, the annular friction plate 13 can drive the friction wheel 14, the connecting shaft 11 and the brush roller 9 to rotate synchronously.

[0028] The advantage of such an arrangement is that when the baffle 4 switches to the material blocking state, the brush roller 9 moves away from the corresponding baffle 4, and in the process of moving away, the brush roller 9 rotates to sweep the material away from the corresponding baffle 4 (as shown in Figure 5 , in the process of moving from the left side to the right side, the brush roller 9 moves away from the corresponding baffle 4 and rotates counterclockwise), further improving the screening efficiency; when the baffle 4 switches to the discharging state, the brush roller 9 approaches the corresponding baffle 4, and the brush roller 9 can rotate to improve the efficiency of sweeping the material.

[0029] In another embodiment of the present application, as an alternative to the first elastic member forcing the connecting rod 10 to approach the baffle 4, preferably, the annular enclosure 6 is provided with a plurality of extensions 12, the plurality of extensions 12 are fixed with an annular friction plate 13, the end of the brush roller 9 is fixed with a friction wheel 14, the friction wheel 14 and the annular friction plate 13 are matched, and the first elastic member is used to force the connecting rod 10 to move away from the baffle 4. Specifically, the annular friction plate 13, the annular enclosure 6 and the annular screen 3 are coaxially arranged, the annular friction plate 13 is located on the side of the connecting rod 10 away from the annular enclosure 6, and interference between the structures is avoided as much as possible; the friction wheel 14 is located on the side of the connecting rod 10 away from the annular enclosure 6 and is fixed on the connecting shaft 11, the friction wheel 14 is in transmission connection with the outer wall of the annular friction plate 13; in this embodiment, the first elastic member can be a torsion spring structure (not shown) in the prior art, which is used to force the connecting rod 10 to move away from the baffle 4, so as to drive the connecting shaft 11 and the annular enclosure 6 to separate and drive the friction wheel 14 and the annular friction plate 13 to be in transmission connection (in this embodiment, the connecting shaft 11 does not interfere with the annular enclosure 6, but the outer wall of the brush roller 9 still contacts the annular screen 3), so that the connecting shaft 11 and the annular enclosure 6 are avoided to interfere, and in the process of moving of the brush roller 9, the annular friction plate 13 can drive the friction wheel 14, the connecting shaft 11 and the brush roller 9 to rotate synchronously. Figure 6 Figure 6 ​The state of the right side baffle 4); the end of the connecting rod 10 close to the baffle 4 is configured with a connecting column 17 arranged along the axial direction of the connecting shaft 11, the connecting column 17 and the connecting rod 10 are rotationally connected with the connecting shaft 11, the connecting column 17 extends to the plane where the arc-shaped limiting plate 15 and the stop block 16 are located, during the rotation of the ring-shaped screen 3, the right upper connecting column 17 and the stop block 16 are in contact (as shown in Figure 7 , the corresponding connecting column 17 and the stop block 16 on the right side baffle 4 are in contact), so as to force the baffle 4 to rotate to the discharging state, in the process, the first elastic member and the second elastic member store elastic potential energy, then the connecting column 17 passes the stop block 16 and contacts the outer wall of the arc-shaped limiting plate 15, the baffle 4 remains in the discharging state, until the connecting column 17 is separated from the arc-shaped limiting plate 15 (as shown in Figure 6 , the corresponding connecting column 17 on the right side baffle 4 is separated from the arc-shaped limiting plate 15), the baffle 4 rotates to the blocking state under the action of the first elastic member and the second elastic member.

[0030] In this way, during the rotation of the ring-shaped screen 3, the plurality of baffles 4 can be passively switched between states based on their relative positions with the arc-shaped limiting plate 15, so that the baffle 4 can be switched from the discharging state to the blocking state at the bottom to drive the material in the ring-shaped screen 3 to rise, and switched from the blocking state to the discharging state at the top to re-enter the unqualified material screened out into the processing mechanism 2. The advantage is that during the rotation of the ring-shaped screen 3, the baffle 4 can be passively switched between states based on the arc-shaped limiting plate 15 and other structures to adapt to the screening and circulation of the material. Compared with the original technical solution of setting multiple motors on the ring-shaped screen 3 to drive multiple baffles 4 to rotate, the technical solution in the embodiment greatly reduces the cost and improves the automation degree of the device.

[0031] The application also provides a preparation method of a carbon nanotube-coated porous silicon structure, which is based on the preparation device of any one of the above and comprises the following steps: S1, treating silicon powder by grinding, acid pickling and solvent cleaning to obtain silicon powder with uniform particle size and a particle size of less than 50 microns; S2, treating the silicon powder with hydrofluoric acid, nitric acid, hydrochloric acid, sulfuric acid, hydrogen peroxide or a mixed acid combined thereof to obtain porous silicon (preferably, the proportion of the mixed acid is hydrofluoric acid:nitric acid:hydrogen peroxide = 10:3:1); S3, dispersing carbon nanotubes (this is a prior art, and the dispersion method described in the patent with the publication number CN117566729A can be selected), then mixing and stirring the carbon nanotubes and the porous silicon, and finally passing the stirred mixed liquid through a long heating belt with a front plate, controlling the front plate well, and making the mixed liquid present a rolling motion on the heating belt until the solvent is evaporated by more than 80% and a block structure is presented; S4, crushing the block structure in the above step by a crusher, and then rolling the crushed material in a roller for 2 hours; S5, combining carbon nanotubes, graphite, carbon black, carbon fibers, graphene oxide, porous carbon, pitch and other materials to perform coating by a coating machine (preferably, carbon nanotubes:graphene:pitch = 1:2:5); and S6, finally forming a product (i.e., a carbon nanotube-coated porous silicon structure) by the processes of depolymerization, sintering, crushing, screening and magnetic removal. Specifically, in the particle size reduction process of the silicon powder or silicon-based material in the above steps, the preparation device of any one of the above can be used for treatment.

[0032] The above only describes certain exemplary embodiments of the application in a descriptive manner, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the application.

Claims

1. An apparatus for preparing a carbon nanotube-coated porous silicon structure, comprising a main body and a processing mechanism fixed to the main body and used to reduce the particle size of a silicon-based material, characterized in that, The main body is provided with: An annular screen is rotationally connected to the main body, and the processing mechanism is arranged in the annular screen; A baffle is rotationally connected to the annular screen, and the baffle has a material blocking state and a material discharging state when the baffle rotates with the annular screen. When the baffle is located below the processing mechanism, the baffle is in the material blocking state to drive the unqualified material to rise. After the baffle moves above the processing mechanism, the baffle switches to the material discharging state to allow the material to fall into the processing mechanism.

2. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 1, wherein The main body is provided with a circulation cavity, and the annular screen is rotationally connected to the circulation cavity, and the processing mechanism is fixed to the inner wall of the circulation cavity.

3. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 1, wherein The annular screen is provided with an annular baffle.

4. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 2, wherein A gap is left between the outer wall of the annular screen and the inner wall of the circulation cavity.

5. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 2, wherein The processing mechanism is provided with an inlet at the top and an outlet at the bottom.

6. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 5, wherein The main body is provided with a feeding channel communicating with the circulation cavity, and the feeding channel extends into the inlet. The main body is provided with a discharge port communicating with the circulation cavity at the bottom.

7. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 1, wherein A brush roller is arranged in the annular screen, and a connecting rod is hingedly connected to the end of the brush roller. The connecting rod is hingedly connected to the baffle, and a first elastic member is arranged between the connecting rod and the baffle.

8. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 7, wherein During the lifting of the baffle with the annular screen, the baffle switches to the material blocking state to drive the brush roller away from the baffle, thereby driving the material on the annular screen away from the baffle. With the rotation of the annular screen, the material again approaches the baffle under the action of gravity, thereby repeatedly screening the material.

9. The device for preparing a carbon nanotube-coated porous silicon structure according to claim 8, wherein After the baffle is lifted above the processing mechanism, the baffle switches to the material discharging state to drive the brush roller to approach the baffle. At the same time, the brush roller can clean the annular screen.

10. A method for the production of a carbon nanotube-coated porous silicon structure, based on the production device for a carbon nanotube-coated porous silicon structure according to any one of claims 1 to 9, characterized in that The method comprises the following steps: S1. The silicon powder is treated by grinding, pickling and solvent cleaning to obtain silicon powder with uniform particle size and a particle size of less than 50 microns; S2. The silicon powder is treated by a mixed acid of hydrofluoric acid, nitric acid, hydrochloric acid, sulfuric acid, hydrogen peroxide or a combination thereof to obtain porous silicon; S3. The carbon nanotubes are dispersed, then the carbon nanotubes and the porous silicon are mixed and stirred, and finally the stirred mixture is passed through a long heating strip with a front plate until the solvent evaporates by more than 80%, forming a block structure; S4. The block structure in the above step is crushed by a crusher, and then the crushed material is rolled in a roller for 2 hours; S5. The carbon nanotube, graphite, carbon black, carbon fiber, graphene oxide, porous carbon, asphalt and other materials are combined and coated by a coating machine; S6. Finally, the product is formed by the processes of depolymerization, sintering, crushing, screening and magnetic removal.

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