Composite material and preparation device thereof

Abstract

The utility model provides a composite material and a preparation device thereof, and the preparation device comprises a rotary furnace which is provided with a cavity structure for filling a substrate material; the rotating shaft penetrates in the length direction of the rotary furnace and is of a hollow structure, an air inlet is formed in one end of the rotating shaft, and the other end of the rotating shaft is in a closed state; the lifting plates are arranged on a shaft body of the rotating shaft; wherein the lifting plates comprise solid lifting plates and lifting plates with holes, and the lifting plates with holes are communicated with the hollow structure of the rotating shaft. The rotary furnace has the characteristics of safety and mass production, the fluidized bed can enable materials to be in full contact with gas, and the rotary furnace and the fluidized bed are combined, so that mass production can be realized while uniform deposition is ensured. Wherein the lifting plate with the holes is arranged on the rotating shaft, and when the substrate material passes through the lifting plate with the holes, the introduced silicon source or carbon source gas can form a fluidization effect, so that the substrate material is in full contact with the gas, and the deposition uniformity is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to negative material production and manufacturing technical field, specifically, relate to a kind of composite material and its preparation device. BACKGROUND

[0002] Gas deposition technology (CVD) is widely used in negative material, especially in using silicon source gas to prepare silicon-carbon material, and in using carbon source gas to carry out surface deposition coating. At present, the equipment selected for realizing CVD technology mainly includes rotary furnace and fluidized bed. In the rotary furnace, part of the materials always gather in the bottom layer of the materials and tightly contact with the furnace tube during the turning process, so that these materials cannot be in full contact with the related gas along with the rotation of the furnace tube, resulting in uneven reaction. The fluidized bed has a single gas inlet, and the gas flow is concentrated and unevenly distributed, which can easily produce bubbles, increase gas consumption and make the reaction uneven. In addition, the fluidized bed cannot solve the problem of mass production. When the amount of materials to be processed reaches ton level, the effect of fluidization by gas is not good, and the reaction will be uneven.

[0003] Therefore, it is urgent to provide a preparation device for preparing composite material to solve the problem of uneven deposition of composite material in the prior art. SUMMARY

[0004] The utility model aims at providing a composite material preparation device to solve the problem of uneven deposition in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides a composite material preparation device, which comprises a rotary furnace having a cavity structure to fill the base material; a rotating shaft is arranged along the length direction of the rotary furnace, the rotating shaft is a hollow structure, one end of the rotating shaft is provided with a gas inlet, and the other end of the rotating shaft is in a closed state; a plurality of lifting plates are arranged on the shaft body of the rotating shaft; wherein the lifting plates include solid lifting plates and perforated lifting plates, and the perforated lifting plates are in communication with the hollow structure of the rotating shaft.

[0006] The composite material preparation device provided by the utility model has the lifting plates arranged on the shaft body of the rotating shaft, and the lifting plates include solid lifting plates and perforated lifting plates. This structural design utilizes the principles of physical stirring and material lifting, increases the contact area between the materials and the gas, and improves the speed of chemical reaction. The perforated lifting plates can communicate with the silicon source gas or the carbon source gas, which makes the gas required for the reaction uniformly distributed in the base material, thereby improving the efficiency of the reaction and the quality of the material.

[0007] The rotary furnace has the characteristics of safety and mass production, and the fluidized bed can be in full contact with the gas. The composite material preparation device combines the rotary furnace and the fluidized bed, which can ensure uniform deposition and mass production. The gas inlet is arranged on the rotating shaft to directly introduce the external gas into the cavity of the rotating shaft, and the hollow structure of the rotating shaft is used to directly transport the gas to the perforated paddle. The perforated paddle is arranged on the rotating shaft, and when the base material passes through the perforated paddle, the introduced silicon source gas or carbon source gas can form a fluidization effect, so that the base material is in full contact with the gas, and the deposition effect is enhanced. At the same time, the rotating shaft can also be stirred to avoid the base material flowing outward or accumulating on one side during the gas phase deposition process.

[0008] The hollow structure of the rotating shaft allows the gas or other medium to be directly transmitted through the shaft body, and the communication between the rotating shaft and the perforated paddle ensures that the silicon source gas or carbon source gas is directly transported from the center of the rotating shaft to the perforated paddle, which allows the gas to be uniformly distributed to each perforated paddle, so that the gas is more uniformly contacted with the base material, improving the efficiency of the chemical reaction and solving the problem of uneven deposition. In addition, the design of the entire system reduces the number of additional pipes and connectors, improves the simplicity of operation and the reliability of the system, and reduces maintenance costs and system complexity.

[0009] The end of the rotating shaft away from the gas inlet is in a closed state, which can not only avoid the deposition gas being directly discharged to the outside, but also increase the pressure in the rotating shaft to ensure that the deposition gas is sent to the cavity structure of the rotary furnace through the holes of the perforated paddle. In addition, the increased pressure in the rotating shaft can also improve the fluidization effect of the deposition gas.

[0010] In any of the above technical solutions, the gas inlet is connected with a gas pressurizing assembly.

[0011] The gas pressurizing assembly connected with the gas inlet can adjust the pressure of the gas before inputting to ensure that the flow rate and pressure of the gas in the entire system are maintained in the optimal state, which helps the base material to form a small fluidized bed near the perforated paddle, so that the base material is in full contact with the gas source, and the efficiency and effect of the chemical reaction are ensured.

[0012] In any of the above technical solutions, the preparation device further comprises: a gas outlet, the gas outlet is arranged on the end of the rotary furnace away from the gas inlet, and the gas outlet is in communication with the internal space of the rotary furnace.

[0013] The outtake is arranged at the end of the rotary furnace far from the intake, forming a flow path of the gas in the rotary furnace, which helps to achieve a more uniform reaction process, thereby improving the efficiency of the reaction and the quality of the product. The outtake is used for the exhaust gas discharge in the furnace, and the outtake is directly communicated with the internal space of the rotary furnace, which ensures that the gas can be smoothly discharged from the rotary furnace, helps to maintain the pressure balance in the furnace, and avoids causing safety hazards.

[0014] In any of the above technical solutions, the outtake is arranged at the periphery of the rotating shaft.

[0015] By arranging the outtake at the periphery of the rotating shaft and arranging the outtake at the end of the rotary furnace far from the intake, on the one hand, the outtake is ensured not to be communicated with the hollow structure of the rotating shaft, and on the other hand, the exhaust gas in the rotary furnace can be discharged through the outtake. Avoiding the communication between the outtake and the hollow structure of the rotating shaft is to avoid the gas entering from the intake being directly discharged to the outside without entering the cavity structure of the rotary furnace, thereby effectively utilizing the deposition gas required for preparing the composite material.

[0016] In any of the above technical solutions, the height of the solid lifting plate relative to the rotating shaft is greater than the height of the hole lifting plate relative to the rotating shaft.

[0017] The lifting plate is used to stir the base material in the rotary furnace, helping the base material to be uniformly heated and promoting the chemical reaction. By arranging the height of the solid lifting plate relative to the rotating shaft to be greater than the height of the hole lifting plate relative to the rotating shaft, the solid lifting plate lifts the base material, and in this process, the base material is in full contact with the gas discharged by the hole lifting plate, improving the uniformity of deposition. Through the layered lifting plate design, the over-accumulation or caking of the base material on the hole lifting plate can be avoided, and the occurrence of safety hazards is reduced.

[0018] In any of the above technical solutions, the solid lifting plate and the hole lifting plate are arranged in intervals.

[0019] The solid lifting plate is mainly used to strongly push or lift the material, and the hole lifting plate allows the gas to pass through the holes and contact the base material more effectively. By arranging in intervals, it is ensured that there are solid lifting plates on both sides of a hole lifting plate, so that the base material is stirred by the solid lifting plate, and the gas discharged by the hole lifting plate can be in more uniform contact with the base material, achieving uniform deposition and effectively reducing energy consumption. The interval arrangement can also prevent the accumulation and blockage of the base material on the hole lifting plate, reducing safety hazards.

[0020] In any of the above technical solutions, the rotating shaft is provided with solid lifting plates at both ends.

[0021] The solid lifting blades are mainly used for forcibly pushing or lifting the materials during the processing, and the solid lifting blades are arranged at the two ends of the rotating shaft, so that the base materials in the rotary furnace can be fully stirred, so that the silicon source gas or the carbon source gas is uniformly deposited on the base materials. Since the solid lifting blades are uniformly distributed at the two ends of the rotating shaft, mechanical wear caused by uneven loading of the materials can be reduced, the service life of the equipment is prolonged, and the maintenance cost is reduced.

[0022] In any of the technical solutions, a heating assembly is arranged around the rotary furnace.

[0023] The heating assembly is arranged around the rotary furnace and is used for providing additional heating capacity, so as to ensure that the silicon source gas or the carbon source gas is cracked and deposited on the base materials. By arranging the heating assembly around the rotary furnace, the heat energy can be more effectively utilized, the loss of heat in the transmission process is reduced, and the overall thermal efficiency is improved. Uniform heat distribution helps to ensure the processing quality of the materials and avoid inconsistent performance of the materials caused by uneven temperature.

[0024] The utility model discloses still provide a kind of composite material, composite material is prepared using the preparation device as described above.

[0025] Under the premise of ensuring safety, the preparation device can be mass-produced, and the uniformity of gas deposition can be ensured through the ingenious design of the equipment structure, so as to prepare a composite material with excellent performance. During the preparation process, the cracked silicon source or carbon source is uniformly deposited on the base material, so as to ensure that the composite material has excellent performance, and when used as a negative electrode material for lithium batteries, the lithium batteries have better stable cycle performance and higher coulomb efficiency.

[0026] In any of the technical solutions, the base material includes at least one of porous carbon, MOFs and graphene; and / or the rotating shaft is communicated with the silicon source gas or the carbon source gas.

[0027] Porous carbon has a high specific surface area and excellent chemical stability. Metal-organic frameworks (MOFs) are a kind of porous material composed of metal ions or clusters and organic ligands connected by coordination bonds, with highly adjustable pore structure and functionality. Graphene is a two-dimensional material composed of single-layer carbon atoms arranged in a honeycomb structure, with extremely high electrical conductivity, thermal conductivity and mechanical strength. The silicon-carbon material prepared from these high-specific-surface-area materials enables the negative electrode material to have higher energy density and cycle performance.

[0028] The perforated lifting blades are arranged on the rotating shaft, and the rotating shaft is communicated with the silicon source gas or the carbon source gas. Further, the deposition gas flows out from the perforated lifting blades, and the silicon source gas or the carbon source gas introduced through the perforated lifting blades can form a fluidization effect, thereby enabling the base material to be in full contact with the gas and enhancing the deposition effect.

[0029] The technical scheme of the utility model can achieve the following technical effects:

[0030] (1) The utility model combines the advantages of safety and mass production in a rotary furnace and full contact between materials and gas in a fluidized bed, and through the design of the rotating shaft with the hole lifting plate, the hole lifting plate is connected to the gas and passes between the materials to form a fluidization effect, ensuring that the materials can be fully contacted with the gas and enhancing the deposition effect; at the same time, the rotating shaft can also be stirred to avoid the materials flowing outward or accumulating on one side under the rotation of the furnace body during the gas phase deposition process.

[0031] (2) Through the design of the interval between the solid lifting plate and the hole lifting plate and the different sizes of the two, the hole lifting plate does not participate in the stirring, ensuring that there will be no safety accidents due to the blocking of the holes by the materials.

[0032] (3) The rotary furnace is used as the shape of the entire furnace body design, which can realize large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A structure diagram of a composite material preparation device is provided for the embodiments of the utility model.

[0034] MARKS OF THE DRAWINGS:

[0035] 100-rotary furnace; 200-rotating shaft; 210-gas inlet; 300-lifting plate; 310-solid lifting plate; 320-hole lifting plate; 321-hole; 400-gas outlet. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings.

[0037] In the prior art, the problem of uneven deposition is solved by increasing the stirring speed and stirring mode in the rotary furnace, or increasing the amount of gas and multi-pipeline gas in the fluidized bed, but the problem is not fundamentally solved. In addition, the practicability of the device is not considered from the perspective of safety in the prior art.

[0038] As Figure 1The embodiment of the utility model provides a kind of composite material preparation device, preparation device includes: rotary furnace 100, rotary furnace 100 is equipped with cavity structure to fill base material;Rotary shaft 200, rotary shaft 200 is through setting along the length direction of rotary furnace 100, rotary shaft 200 is hollow structure, one end of rotary shaft 200 is equipped with air inlet 210, the other end of rotary shaft 200 is closed state;Material lifting plate 300, several material lifting plates 300 are set on the shaft body of rotary shaft 200;Wherein, material lifting plate 300 includes solid material lifting plate 310 and hole material lifting plate 320, hole material lifting plate 320 is communicated with the hollow structure of rotary shaft 200.

[0039] The composite material preparation device provided by the utility model has the advantages that the material lifting plate 300 is fixed on the shaft body of the rotary shaft 200, the material lifting plate 300 includes the solid material lifting plate 310 and the hole material lifting plate 320, the structure design utilizes the principle of physical stirring and material lifting, the contact area of the material and the hot gas flow is increased, and the thermal efficiency and the speed of chemical reaction are improved.

[0040] The rotary furnace 100 has the characteristics of safety and mass production, the fluidized bed can be in full contact with the material and the gas, the composite material preparation device combines the rotary furnace 100 and the fluidized bed, and can realize mass production while ensuring uniform deposition. The gas inlet 210 is arranged on the rotary shaft 200 to directly introduce the external gas into the cavity of the rotary shaft 200, and the hollow structure of the rotary shaft 200 is used to directly convey the gas to the hole material lifting plate 320. The hole material lifting plate 320 is arranged on the rotary shaft 200, and when the base material passes through the hole material lifting plate 320, the introduced silicon source gas or carbon source gas can form a fluidization effect, so that the base material is in full contact with the gas, the deposition effect is enhanced, and the rotary shaft 200 can also be stirred to avoid the base material flowing outward or accumulating on one side during the gas phase deposition process.

[0041] Specifically, the silicon-carbon material is one of the composite materials, when the silicon-carbon material is prepared by using the gas phase deposition technology, the carbon-based material is used as the base material, and then the silicon source gas is cracked at a certain temperature by using the gas phase deposition technology. After the silicon source gas is in full contact with the carbon-based material by using the preparation device, the nanosilicon particles obtained by cracking the silicon source gas are deposited in the interior and surface of the porous carbon. After the deposition is completed, the silicon source gas is switched to the carbon source gas, and the carbon layer generated by cracking the carbon source gas at a certain temperature can be coated on the above-mentioned material, so that the silicon-carbon material with good coating is obtained.

[0042] The hollow structure of the rotating shaft 200 allows the gas or other medium to be directly transmitted through the shaft body. The communication between the rotating shaft 200 and the perforated lifter plate 320 ensures that the silicon source gas or the carbon source gas is directly transported from the center of the rotating shaft 200 to the perforated lifter plate 320, which allows the gas to be uniformly distributed to each perforated lifter plate 320, so that the gas can more uniformly contact the base material, improve the efficiency of the chemical reaction, and solve the problem of uneven deposition. In addition, the design of the entire system reduces the number of additional pipes and connectors, improves the convenience of operation and the reliability of the system, and reduces the maintenance cost and system complexity.

[0043] It should be noted that the connection mode of the solid lifter plate 310 and the rotating shaft 200 is not connected internally, and the connection mode of the perforated lifter plate 320 and the rotating shaft 200 is internally connected. The gas can enter through the gas inlet 210 of the rotating shaft 200, and then be sprayed through the holes 321 on the perforated lifter plate 320.

[0044] The end of the rotating shaft 200 away from the gas inlet 210 is in a closed state, which can not only prevent the deposition gas from being directly discharged to the outside, but also increase the pressure in the rotating shaft 200, so as to ensure that the deposition gas is sent to the cavity structure of the rotary furnace 100 through the holes of the perforated lifter plate 320. In addition, due to the increase of the pressure in the rotating shaft 200, the fluidization effect of the deposition gas can be improved.

[0045] In some embodiments of the present application, the gas inlet 210 is connected with a gas pressurizing assembly.

[0046] Through the gas pressurizing assembly connected with the gas inlet 210, the pressure of the gas can be adjusted before being input, so as to ensure that the flow rate and pressure of the gas in the entire system are maintained in an optimal state, which helps to form a small fluidized bed near the perforated lifter plate 320, so that the base material can be fully contacted with the gas source, and the efficiency and effect of the chemical reaction are ensured.

[0047] In some embodiments of the present application, the preparation device further comprises: a gas outlet 400, which is arranged at the end of the rotary furnace 100 away from the gas inlet 210, and the gas outlet 400 is in communication with the internal space of the rotary furnace 100.

[0048] The gas outlet 400 is arranged at the end of the rotary furnace 100 away from the gas inlet 210, which forms the flow path of the gas in the rotary furnace 100, and helps to realize a more uniform reaction process, thereby improving the efficiency of the reaction and the quality of the product. The gas outlet 400 is used for exhaust gas discharge in the furnace, and the gas outlet 400 is directly communicated with the internal space of the rotary furnace 100, which ensures that the gas can be smoothly discharged from the rotary furnace 100, and helps to maintain the gas pressure balance in the furnace, avoiding safety hazards.

[0049] In some embodiments of the present application, the gas outlet 400 is arranged on the periphery of the rotating shaft 200.

[0050] By arranging the gas outlet 400 on the periphery of the rotating shaft 200 and on the end of the rotary furnace 100 away from the gas inlet 210, on the one hand, the gas outlet 400 is ensured not to communicate with the hollow structure of the rotating shaft 200, and on the other hand, the tail gas in the rotary furnace 100 can be discharged through the gas outlet 400. Avoiding the communication between the gas outlet 400 and the hollow structure of the rotating shaft 200 aims to avoid the gas entering through the gas inlet 210 being directly discharged to the outside without entering the cavity structure of the rotary furnace 100, thereby effectively utilizing the deposition gas required for the preparation of composite materials.

[0051] In some embodiments of the present application, the height of the solid lifting plate 310 relative to the rotating shaft 200 is greater than the height of the perforated lifting plate 320 relative to the rotating shaft 200.

[0052] The lifting plate 300 is used to stir the base material in the rotary furnace 100, helping the base material to be uniformly heated and promoting chemical reactions. By arranging the height of the solid lifting plate 310 relative to the rotating shaft 200 to be greater than the height of the perforated lifting plate 320, the solid lifting plate 310 lifts the base material, and in the process, the base material is in full contact with the gas dispersed by the perforated lifting plate 320, improving the uniformity of deposition. Through the layered design of the lifting plate 300, excessive accumulation or caking of the base material on the perforated lifting plate 320 can be avoided, reducing the occurrence of safety hazards.

[0053] In some embodiments of the present application, the solid lifting plate 310 and the perforated lifting plate 320 are arranged in intervals.

[0054] The solid lifting plate 310 is mainly used to strongly push or lift the material, while the perforated lifting plate 320 allows the gas to pass through the holes 321 and contact the base material more effectively. By arranging in intervals, it is ensured that both sides of a perforated lifting plate 320 have solid lifting plates 310, so that the base material is stirred by the solid lifting plate 310 while the gas introduced by the perforated lifting plate 320 can be in more uniform contact with the base material, achieving uniform deposition and effectively reducing energy consumption. Interval arrangement can also prevent the accumulation and clogging of the base material on the perforated lifting plate 320, reducing safety hazards.

[0055] In some embodiments of the present application, the rotating shaft 200 is provided with solid lifting plates 310 at both ends.

[0056] The solid lifting plate 310 is mainly used for forcibly pushing or lifting the material during the processing process. The solid lifting plate 310 is arranged at both ends of the rotating shaft 200, so that the base material in the rotary furnace 100 can be fully stirred, and the silicon source gas or the carbon source gas is uniformly deposited on the base material. Since the solid lifting plate 310 is uniformly distributed at both ends of the rotating shaft 200, mechanical wear caused by uneven loading of the material can be reduced, the service life of the equipment is prolonged, and the maintenance cost is reduced.

[0057] In some embodiments of the present application, a heating assembly is arranged around the rotary furnace 100.

[0058] The heating assembly is arranged around the rotary furnace 100 and is used to provide additional heating capacity to ensure that the silicon source gas or the carbon source gas is cracked and deposited on the base material. By arranging the heating assembly around the rotary furnace 100, the heat energy can be more effectively utilized, the heat loss in the transmission process is reduced, and the overall thermal efficiency is improved. Uniform heat distribution helps to ensure the processing quality of the material and avoid inconsistent performance of the material caused by uneven temperature. Preferably, the heating method can adopt one of electric heating, gas heating or magnetic induction heating.

[0059] During the stirring of the material, the hole lifting plate 320 can send the silicon source gas or the carbon source gas from the hole 321 into the rotary furnace 100, so that the gas is cracked and uniformly deposited inside the porous base material. By setting the size of the hole 321 to be smaller than the size of the base material, it is ensured that the base material will not block the hole 321 during stirring, avoiding uneven coating and safety problems.

[0060] The embodiment of the utility model provides a kind of composite material, composite material is prepared using the preparation device as described above.

[0061] Under the premise of ensuring safety, the preparation device can be mass-produced, and the uniformity of gas phase deposition can be ensured by the ingenious design of the equipment structure, so as to prepare a composite material with excellent performance. During the preparation process, the cracked silicon source or carbon source is uniformly deposited on the base material, so as to ensure that the composite material has excellent performance, and when it is used as a negative electrode material for lithium batteries, the lithium batteries have better stable cycle performance and higher coulomb efficiency.

[0062] In some embodiments of the present application, the base material includes at least one of porous carbon, MOFs and graphene; and / or the rotating shaft is communicated with the silicon source gas or the carbon source gas.

[0063] Porous carbon has high specific surface area and excellent chemical stability. Metal organic framework (MOF) is a kind of porous material composed of metal ions or clusters and organic ligands through coordination bond, which has highly adjustable pore structure and functionality. Graphene is a two-dimensional material composed of single-layer carbon atoms arranged in a honeycomb structure, which has extremely high electrical conductivity, thermal conductivity and mechanical strength. The silicon-carbon material prepared by these high specific surface area materials makes the negative electrode material have higher energy density and cycle performance.

[0064] The perforated paddle is arranged on the rotating shaft, and the rotating shaft is communicated with the silicon source gas or the carbon source gas. Further, the deposition gas flows out from the perforated paddle, and the silicon source gas or the carbon source gas is introduced to form a fluidization effect when the perforated paddle passes through the base material, so that the base material is fully contacted with the gas, and the deposition effect is enhanced.

[0065] The silicon source gas is used for depositing a thin film or structure containing silicon. The carbon source gas is used to provide carbon elements to support the growth or modification of carbon-based composite materials. By controlling the interaction between the base material and the gas, the microstructure and macroscopic performance of the material can be precisely controlled, such as carbon nanotubes or graphene produced by CVD technology. Preferably, the silicon source gas includes at least one of silane, disilane, dichlorosilane, trichlorosilane, tetrachlorosilane, dibromosilane, tribromosilane and tetrabromosilane; and the carbon source gas includes at least one of methane, ethane, propane, ethylene, acetylene, gaseous benzene, gaseous toluene, gaseous xylene, gaseous ethanol and gaseous acetone.

[0066] Embodiment 1

[0067] The embodiment of the utility model provides a kind of preparation method of silicon-carbon material, preparation is carried out using above preparation device, as follows specifically:

[0068] In the preparation of silicon-carbon material, the rotary furnace 100 is filled with porous carbon material, then inert gas is introduced from the gas inlet 210 and sent out from the gas outlet 400 to replace the oxygen in the furnace body, so as to ensure that the oxygen content is less than 50ppm, then the silicon source gas is introduced into the furnace body, the gas passes through the gas booster assembly and enters the furnace body along the hollow rotating shaft 200 with one end closed, the rotating shaft 200 is opened, the porous carbon in the furnace body is turned over, the solid lifting plate 310 slowly lifts the porous carbon, and the pressurized gas enters the furnace body through the perforated lifting plate 320 and fully contacts with the porous carbon. Because the gas is pressurized, a small fluidized bed is formed near the perforated lifting plate 320, so that the porous carbon can fully contact with the gas source; at the same time, because the size of the solid lifting plate 310 is larger than that of the perforated lifting plate 320, the porous carbon in the furnace will not be stacked above the perforated lifting plate 320 to block the holes 321, so as to avoid uneven coating and safety problems. Then the furnace body is heated, the gas source in the furnace body will be cracked, and the nanometer silicon particles produced by the cracking of silane will deposit in the porous carbon. After the surface of the porous carbon is covered with enough nanometer silicon particles, the gas source is switched from the silicon source to the carbon source, and the carbon layer is deposited in the above-mentioned manner, so that the prepared silicon-carbon material can be obtained.

[0069] Although the utility model discloses as above, but the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be the range limited by claim.

Claims

1. A composite material preparation device, characterized in that: The preparation device comprises: A rotary kiln (100), wherein the rotary kiln (100) is provided with a cavity structure for filling a base material; a rotating shaft (200), the rotating shaft (200) being arranged to penetrate along the length direction of the rotary kiln (100), the rotating shaft (200) being a hollow structure, an air inlet (210) being provided at one end of the rotating shaft (200), and the other end of the rotating shaft (200) being in a closed state; A material lifting plate (300), wherein a plurality of the material lifting plates (300) are arranged on the shaft of the rotating shaft (200); The lifting plate (300) comprises a solid lifting plate (310) and a perforated lifting plate (320), and the perforated lifting plate (320) is connected to the hollow structure of the rotating shaft (200).

2. The preparation device according to claim 1, characterized in that The air inlet (210) is connected to a gas pressurizing component.

3. The preparation device according to claim 1, characterized in that The preparation device also includes: An air outlet (400) is provided on an end of the rotary kiln (100) away from the air inlet (210), and the air outlet (400) is communicated with the internal space of the rotary kiln (100).

4. The preparation device according to claim 3, characterized in that The air outlet (400) is arranged on the periphery of the rotating shaft (200).

5. The preparation device according to claim 1, characterized in that The height of the solid lifting plate (310) relative to the rotating shaft (200) is greater than the height of the perforated lifting plate (320) relative to the rotating shaft (200).

6. The preparation device according to claim 1, characterized in that The solid lifting plate (310) and the perforated lifting plate (320) are spaced apart.

7. The preparation device according to claim 6, characterized in that: The solid material lifting plates (310) are provided at both ends of the rotating shaft (200).

8. The preparation device according to claim 1, characterized in that A heating component is provided around the rotary kiln (100).

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