Preparation device of nano porous silicon-carbon composite negative electrode material

Abstract

The utility model provides a preparation device of a nano-porous silicon-carbon composite negative electrode material, and relates to the field of batteries, the preparation device comprises a stirring bin, the stirring bin is internally provided with a stirring assembly, and the stirring assembly is internally provided with a conduction assembly; the stirring assembly comprises a rotating shaft rotationally connected to the interior of the stirring bin, a plurality of groups of stirring pieces are arranged on the circumferential side of the rotating shaft, each stirring piece comprises a plurality of stirring barrels arranged at equal intervals, and the rotating shaft is hollow and communicates with the stirring barrels. By arranging the stirring assembly and the conduction assembly, when materials are stirred, the stirring assembly is driven to rotate to stir the materials, the stirring assembly and the conduction assembly are properly heated through a first electric heating piece and a second electric heating piece, then inert gas is injected into the stirring bin through the conduction assembly, and the materials are protected against oxidation; meanwhile, the drying effect is improved, mixing and drying of the materials are completed in the stirring bin, and the process is simpler, more convenient and faster.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a preparation device for a nano porous silicon-carbon composite negative electrode material. Background Art

[0002] Nanoporous silicon-carbon composite negative electrode material is a high-performance negative electrode material for lithium-ion batteries. It has continuous, open, and uniformly distributed nano-scale porous structure characteristics, which can effectively improve the electrochemical performance of silicon materials. Traditional preparation methods usually require the mixing and dispersion of multiple raw materials. This process requires the use of a stirring device to ensure that the various raw materials can be evenly mixed. The mixed wet materials need to be transferred to a drying device in subsequent processing for drying to remove excess water or solvent.

[0003] However, this transfer of raw materials not only increases the preparation steps, but may also introduce additional contamination or errors, thereby affecting the quality and performance of the final product, while affecting the low preparation efficiency.

[0004] For example, the Chinese invention patent (application number: 202211451986.5) discloses a method for preparing a high-purity nanoporous silicon and a silicon-carbon composite negative electrode material. The specification discloses that after grinding the cast silicon alloy to a micron size, the cast silicon alloy is placed in a muffle furnace for heat treatment in an air atmosphere, and the heat-treated sample is placed in an acidic solution for chemical corrosion to form a high-purity nanoporous silicon with continuous, open, and uniformly distributed pores, with a purity of 92.00~99.99%; polymerize a polymer compound on the surface of the nanoporous silicon, and then place the polymer compound in a tubular furnace under an inert protective atmosphere for pyrolysis to obtain a high-purity nanoporous silicon-carbon composite negative electrode material. The method provided by the invention with application number 202211451986.5 can simplify the production process of lithium-ion battery negative electrode materials while effectively improving the cycle performance and coulomb efficiency of lithium-ion battery negative electrode materials; the above patent can prove the defects of the prior art.

[0005] Therefore, we made improvements to this and proposed a preparation device for nanoporous silicon-carbon composite negative electrode materials. Utility Model Content

[0006] The purpose of the utility model is to address the problem that in the preparation of the existing traditional nano porous silicon-carbon composite negative electrode material, the raw materials need to be stirred and mixed before being transferred to a drying device, and this process is cumbersome and easily affects the product quality.

[0007] In order to achieve the above-mentioned utility model purpose and improve the above-mentioned problem, the utility model provides a preparation device of nanoporous silicon-carbon composite negative electrode material, including a stirring chamber, a stirring component is provided inside the stirring chamber, and a conduction component is provided inside the stirring component;

[0008] The stirring assembly includes a rotating shaft rotatably connected to the inside of the stirring chamber, a plurality of stirring members are arranged on the circumferential side of the rotating shaft, and the stirring members include a plurality of stirring barrels arranged at equal intervals, and the rotating shaft is hollow and connected to the stirring barrels;

[0009] The conduction component includes a No. 3 conduction tube fixed inside the rotating shaft, a No. 1 conduction tube fixedly inserted into one side of the No. 3 conduction tube is provided inside the mixing barrel, a No. 2 conduction tube is fixedly inserted into the top and bottom ends of the No. 1 conduction tube, ends of the No. 2 conduction tube and the No. 1 conduction tube are both connected to the outside of the mixing barrel, a No. 1 electric heating plate is provided outside the No. 1 conduction tube, and a No. 2 electric heating plate is provided outside the No. 3 conduction tube.

[0010] As a preferred technical solution of the present application, an exhaust assembly is provided on one side of the mixing chamber, and a conveying assembly is provided on the top of the mixing chamber.

[0011] As a preferred technical solution of the present application, the conveying assembly includes a mounting pipe fixedly inserted into the top of the mixing bin, a conveying pipe is fixedly provided at the top of the mounting pipe, the conveying pipe is connected to the interior of the mounting pipe, the mounting pipe and the top of the No. 3 conducting pipe extend through the rotating shaft to the top of the rotating shaft, and the mounting pipe and the No. 3 conducting pipe are rotatably connected via a straight-through rotating joint.

[0012] As a preferred technical solution of the present application, the exhaust assembly includes a transmission cylinder fixedly inserted into one side of the mixing bin, and a vacuum pump is provided on the transmission cylinder.

[0013] As a preferred technical solution of the present application, several of the mixing barrels are arranged at an angle.

[0014] As a preferred technical solution of the present application, a guide block located inside the third conducting tube is fixedly provided at the bottom end of the rotating shaft, and the top end of the guide block is conical.

[0015] As a preferred technical solution of the present application, a filter screen is fixedly provided inside the transmission cylinder, and the filter screen is located on a side of the vacuum pump close to the stirring chamber.

[0016] As a preferred technical solution of the present application, the No. 1 electric heating plate is located between the stirring barrel and the No. 1 conduction tube, and the No. 2 electric heating plate is located between the rotating shaft and the No. 3 conduction tube.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] In the scheme of this application:

[0019] 1. Through the provided stirring assembly and conduction assembly, when stirring the material, the material is stirred by driving the stirring assembly to rotate, the No. 1 electric heater and the No. 2 electric heater appropriately heat the stirring assembly and the conduction assembly, and then the inert gas is injected into the stirring chamber through the conduction assembly to protect the material from oxidation and improve the drying effect. The mixing and drying of the materials are completed inside the stirring chamber, making the process simpler and faster, and solving the problem in the prior art that the raw materials need to be stirred and mixed before being transferred to the drying device in the preparation of traditional nanoporous silicon-carbon composite negative electrode materials, and this process is cumbersome and easy to affect the product quality; BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a device for preparing a nanoporous silicon-carbon composite negative electrode material provided in this application;

[0021] Figure 2 A schematic diagram of the structure of a stirring assembly in a device for preparing a nanoporous silicon-carbon composite negative electrode material provided in the present application;

[0022] Figure 3 A schematic diagram of the side cross-sectional structure of a preparation device for the nanoporous silicon-carbon composite negative electrode material provided in the present application;

[0023] Figure 4 A schematic diagram of the side cross-sectional structure of a stirring assembly in a device for preparing a nanoporous silicon-carbon composite negative electrode material provided in the present application;

[0024] Figure 5 for Figure 4 A is an enlarged view of the middle image.

[0025] Indicated in the figure:

[0026] 1. Mixing chamber; 2. Mixing assembly; 21. Rotating shaft; 22. Mixing barrel; 3. Exhaust assembly; 31. Transmission cylinder; 32. Vacuum pump; 4. Support seat; 5. Motor; 6. Conduction assembly; 61. Conduction pipe No. 1; 62. Conduction pipe No. 2; 63. Conduction pipe No. 3; 601. Guide block; 71. Heater No. 1; 72. Heater No. 2; 9. Conveying assembly; 91. Mounting pipe; 92. Straight-through rotary joint; 93. Conveying pipe. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0028] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] Example 1

[0032] Please refer to Figure 1 , Figure 2 and Figure 3 , a preparation device of nanoporous silicon-carbon composite negative electrode material, comprising a stirring chamber 1, a motor 5 is fixedly provided at the bottom end of the stirring chamber 1, a support seat 4 is fixedly provided inside the motor 5, the support seat 4 is used to support and install the stirring chamber 1, and the stirring assembly 2 is driven by starting the support seat 4, so as to stir the raw materials inside the stirring chamber 1, the stirring assembly 2 is provided inside the stirring chamber 1, the stirring assembly 2 is provided inside the stirring assembly 2, a conduction assembly 6 is provided inside the stirring assembly 2, an exhaust assembly 3 is provided on one side of the stirring chamber 1, and a conveying assembly 9 is provided at the top of the stirring chamber 1;

[0033] A feed port is provided at the top of the mixing bin 1, and a sealing cover is provided on the feed port. The material is put into the mixing bin 1 through the feed port. A discharge port is provided at the lower side of the mixing bin 1, and an electric valve is provided on the discharge port. The material flows out by opening the electric valve. A No. 3 electric heating plate is provided outside the mixing bin 1. When the material needs to be heated, the No. 3 heating plate is started to heat the material.

[0034] Further, such as Figure 2 and Figure 3 As shown, the stirring assembly 2 includes a rotating shaft 21 rotatably connected to the inside of the stirring chamber 1, the rotating shaft 21 is connected to the output end of the motor 5 through a coupler, the coupler includes a permanent magnet No. 1 and a permanent magnet No. 2, the bottom end of the rotating shaft 21 is fixedly provided with a permanent magnet No. 1 of the coupler, the permanent magnet No. 1 is rotatably connected to the stirring chamber 1, the output end of the motor 5 is provided with a permanent magnet No. 2 of the coupler, the stirring chamber 1 is separated from the permanent magnet No. 1 and the permanent magnet No. 2, when the motor 5 is started, the magnetic force between the permanent magnet No. 1 and the permanent magnet No. 2 interacts with each other, thereby driving the rotating shaft 21 to rotate. A plurality of groups of stirring members are provided on the circumferential side of the rotating shaft 21, and the stirring members include a plurality of stirring barrels 22 arranged at equal intervals, and a variety of raw materials are stirred and mixed through the stirring barrels 22, and the rotating shaft 21 is hollow and connected to the stirring barrels 22.

[0035] Further, such as Figure 3 , Figure 4 and Figure 5 As shown, the conduction component 6 includes a No. 3 conduction tube 63 fixed inside the rotating shaft 21, and a No. 1 conduction tube 61 fixedly inserted on one side of the No. 3 conduction tube 63 is provided inside the mixing barrel 22. The top and bottom ends of the No. 1 conduction tube 61 are fixedly inserted with a No. 2 conduction tube 62, and the position of the No. 2 conduction tube 62 is relatively close to the rotating shaft 21. The ends of the No. 2 conduction tube 62 and the No. 1 conduction tube 61 are both connected to the outside of the mixing barrel 22. The No. 2 conduction tube 62 is used to transmit the gas inside the No. 3 conduction tube 63 to a position close to the center of the mixing chamber 1 to prevent the gas from only flowing out from the end of the No. 1 conduction tube 61 into the mixing chamber 1, resulting in the gas being only distributed on the inner wall of the mixing chamber 1, resulting in the problem of uneven distribution of the inert gas. The inert gas is transmitted to the inside of the mixing chamber 1 through the No. 1 conduction tube 61, and the inert gas is injected into the mixing chamber 1, which can protect the material from oxidation and also help to improve the drying effect.

[0036] Further, such as Figure 4 and Figure 5 As shown, the outside of the No. 1 conducting tube 61 is provided with a No. 1 electric heating plate 71, the outside of the No. 3 conducting tube 63 is provided with a No. 2 electric heating plate 72, and the inside of the No. 1 electric heating plate 71 and the No. 2 electric heating plate 72 are both provided with electric heating wires. By starting the No. 1 electric heating plate 71 and the No. 2 electric heating plate 72, the rotating shaft 21 and the mixing barrel 22 are heated to a proper temperature. The No. 1 electric heating plate 71 and the No. 2 electric heating plate 72 utilize the shape of the mixing component 2 dispersedly arranged inside the mixing bin 1 to heat the material, so that the heating is more uniform, and the material can be properly heated while being stirred, which helps to accelerate the drying process and improve production efficiency.

[0037] At the same time, the dried material can reduce the humidity of the material to prevent part of the material from sticking to the rotating shaft 21, the mixing barrel 22 and the inner wall of the mixing chamber 1 when the material is taken out. When the No. 1 heating plate 71 and the No. 2 heating plate 72 are heated, the No. 1 conduction tube 61, the No. 2 conduction tube 62 and the No. 3 conduction tube 63 are heated to an appropriate temperature, so that the inert gas has a certain temperature when entering the mixing chamber 1, which helps to improve the drying efficiency.

[0038] Example 2

[0039] The preparation device of the nanoporous silicon-carbon composite negative electrode material provided in Example 1 is further optimized. Specifically, Figure 1 and Figure 3As shown, the conveying component 9 includes a mounting pipe 91 fixedly inserted into the top of the mixing chamber 1, a conveying pipe 93 is fixedly provided at the top of the mounting pipe 91, a storage chamber for storing inert gas is provided outside the mixing chamber 1, and the conveying pipe 93 is used to connect with the storage chamber, and the inert gas is transmitted to the conduction component 6 by opening the valve and the air pump. The conveying pipe 93 is communicated with the interior of the mounting pipe 91, and the top of the mounting pipe 91 and the No. 3 conduction pipe 63 extend through the rotating shaft 21 to the top of the rotating shaft 21. The mounting pipe 91 and the No. 3 conduction pipe 63 are rotatably connected by a straight-through rotary joint 92, and the rotational connection is realized by the straight-through rotary joint 92 while the interior of the mounting pipe 91 is communicated with the interior of the No. 3 conduction pipe 63.

[0040] Further, such as Figure 1 and Figure 3 As shown, the exhaust assembly 3 includes a transmission cylinder 31 fixedly inserted into one side of the mixing chamber 1, and a vacuum pump 32 is provided on the transmission cylinder 31. By starting the vacuum pump 32, the air inside the mixing chamber 1 is sucked into the transmission cylinder 31, thereby creating a vacuum environment and reducing oxidation and contamination of the material during the drying process.

[0041] Example 3

[0042] The preparation device of the nanoporous silicon-carbon composite negative electrode material provided in Example 1 and Example 2 is further optimized, such as Figure 2 , Figure 4 and Figure 5 As shown, several mixing barrels 22 are arranged at an angle. The inclined arrangement of the mixing barrels 22 can prevent the raw materials from easily entering the interior of the No. 1 conducting tube 61 through the outlet of the No. 1 conducting tube 61, while the raw materials entering the interior of the No. 1 conducting tube 61 through the No. 2 conducting tube 62 will be thrown to the outlet of the No. 1 conducting tube 61 by the centrifugal force of the rotation of the shaft 21, and thus return to the interior of the mixing chamber 1.

[0043] Further, such as Figure 4 and Figure 5 As shown, a guide block 601 located inside the No. 3 conduction pipe 63 is fixedly provided at the bottom end of the rotating shaft 21, and the top of the guide block 601 is conical. When the gas flows to the bottom end of the No. 3 conduction pipe 63, it is guided by the top of the guide block 601 and flows smoothly into the No. 1 conduction pipe 61 on the side, thereby better cooperating with the inclined setting of the mixing barrel 22 and avoiding the gas from directly hitting the plane when flowing to the bottom end of the No. 3 conduction pipe 63, resulting in flow rate loss.

[0044] Further, such as Figure 3 As shown, a filter screen is fixedly provided inside the transmission cylinder 31 , and the filter screen is located on the side of the vacuum pump 32 close to the mixing chamber 1 , and the filter screen is used to prevent the material from being sucked into the vacuum pump 32 .

[0045] The use process of the preparation device of the nanoporous silicon-carbon composite negative electrode material provided by the utility model is as follows:

[0046] When the materials in the mixing chamber 1 need to be mixed, the motor 5 is started to drive the rotating shaft 21 and the plurality of mixing barrels 22 to rotate, thereby mixing the materials inside.

[0047] When the material needs to be stirred, it is dried at the same time. The vacuum pump 32 is started to put the stirring chamber 1 in a vacuum state to reduce oxidation and contamination of the material during the drying process. The No. 1 electric heater 71 and the No. 2 electric heater 72 are started to heat the stirring barrel 22, the rotating shaft 21 and the conductive component 6 to an appropriate temperature. Subsequently, the inert gas is transmitted to the inside of the No. 3 conductive pipe 63 through the conveying pipe 93 through the conveying component 9. The inert gas is evenly transmitted to the inside of the stirring chamber 1 through the No. 1 conductive pipe 61 and the No. 2 conductive pipe 62 to protect the material from oxidation and improve the drying effect. At this time, the motor 5 is started again to stir the material, so that the stirring barrel 22 with a certain temperature continuously stirs and passes through the material, thereby further improving the uniformity of the inert gas distribution and the drying effect, and completing the mixing, stirring and drying of the material more quickly.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A device for preparing a nanoporous silicon-carbon composite negative electrode material, characterized in that: It comprises a stirring chamber (1), a stirring component (2) is provided inside the stirring chamber (1), and a conduction component (6) is provided inside the stirring component (2); The stirring assembly (2) comprises a rotating shaft (21) rotatably connected to the inside of the stirring chamber (1); a plurality of stirring members are arranged on the circumferential side of the rotating shaft (21); the stirring members comprise a plurality of stirring barrels (22) arranged at equal intervals; the rotating shaft (21) is hollow and communicates with the stirring barrels (22); The conduction component (6) comprises a No. 3 conduction tube (63) fixed inside the rotating shaft (21); a No. 1 conduction tube (61) fixedly inserted into one side of the No. 3 conduction tube (63) is provided inside the mixing barrel (22); a No. 2 conduction tube (62) is fixedly inserted into the top and bottom ends of the No. 1 conduction tube (61); ends of the No. 2 conduction tube (62) and the No. 1 conduction tube (61) are both connected to the outside of the mixing barrel (22); a No. 1 electric heating plate (71) is provided outside the No. 1 conduction tube (61); and a No. 2 electric heating plate (72) is provided outside the No. 3 conduction tube (63).

2. The device for preparing a nanoporous silicon-carbon composite negative electrode material according to claim 1, characterized in that: An exhaust assembly (3) is provided on one side of the mixing chamber (1), and a conveying assembly (9) is provided on the top of the mixing chamber (1).

3. The device for preparing a nanoporous silicon-carbon composite negative electrode material according to claim 2, characterized in that: The conveying assembly (9) comprises a mounting tube (91) fixedly inserted into the top end of the mixing chamber (1); a conveying tube (93) is fixedly provided at the top end of the mounting tube (91); the conveying tube (93) is communicated with the interior of the mounting tube (91); the mounting tube (91) and the top end of the third conducting tube (63) pass through the rotating shaft (21) and extend to the top end of the rotating shaft (21); the mounting tube (91) and the third conducting tube (63) are rotatably connected via a straight-through rotating joint (92).

4. The device for preparing a nanoporous silicon-carbon composite negative electrode material according to claim 3, characterized in that: The exhaust assembly (3) comprises a transmission cylinder (31) fixedly inserted into one side of the mixing bin (1), and a vacuum pump (32) is provided on the transmission cylinder (31).

5. The device for preparing a nanoporous silicon-carbon composite negative electrode material according to claim 4, characterized in that: The plurality of mixing barrels (22) are arranged to be inclined.

6. The device for preparing a nanoporous silicon-carbon composite negative electrode material according to claim 5, characterized in that: A guide block (601) located inside the third conducting tube (63) is fixedly provided at the bottom end inside the rotating shaft (21), and the top end of the guide block (601) is conical.

7. The device for preparing a nanoporous silicon-carbon composite negative electrode material according to claim 6, characterized in that: A filter screen is fixedly provided inside the transmission cylinder (31), and the filter screen is located on a side of the vacuum pump (32) close to the stirring chamber (1).

8. The device for preparing a nanoporous silicon-carbon composite negative electrode material according to claim 7, characterized in that: The first electric heating plate (71) is located between the stirring barrel (22) and the first conducting tube (61), and the second electric heating plate (72) is located between the rotating shaft (21) and the third conducting tube (63).

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