Preparation device of nano silicon particles

Abstract

The invention relates to the technical field of nano silicon preparation, in particular to a nano silicon particle preparation device which comprises a muffle furnace used for heating reaction raw materials including magnesium powder and silicon dioxide powder; the stainless steel container is located in the muffle furnace, and the stainless steel container is used for containing reaction raw materials; one end of the thermocouple is connected to the interior of the stainless steel container through a wire, and the other end of the thermocouple is connected to the data collector; and the display is connected with the data acquisition unit. According to the preparation device of the nano silicon particles, the real-time reaction temperature of the reaction raw materials in the stainless steel container is fed back through the thermocouple, and the real-time reaction temperature is displayed on the display after being processed by the data collector, so that a worker can know and monitor the real-time reaction temperature in time, and the preparation success rate of the nano silicon particles is improved.

Description

Technical Field

[0001] The invention relates to the technical field of nano silicon preparation, and in particular to a device for preparing nano silicon particles. Background Art

[0002] At present, most of the schemes for preparing nano-silicon negative electrode materials for lithium-ion batteries are: first prepare nano-silicon grains, then compound them with other materials, and modify the composite materials by doping, structural preparation, MOF modification, etc., and finally obtain silicon-based composite materials with good conductivity and cyclability. The microstructure and physical and chemical properties of nano-silicon directly affect the physical and chemical properties of subsequent silicon-based materials. Therefore, the preparation of nano-silicon is extremely important. Common methods for preparing Si particles are: (1) vapor deposition method; (2) mechanical grinding method; (3) spray granulation technology; (4) liquid phase rapid cooling method; (5) plasma evaporation condensation method; (6) magnesium thermal reduction method.

[0003] The magnesium thermal reduction method for preparing silicon materials was proposed by scientist Bao in 2007. Magnesium thermal reduction has become a popular method for studying high-performance silicon-based materials due to its low-cost production, simple operation, simple raw materials and low energy consumption. This is a violent gas-solid reduction reaction. The reducing agent magnesium and the product nano-silicon are highly reactive and easily oxidized. The reaction process is very fast and produces a large amount of gaseous Mg. Therefore, the magnesium thermal reduction reaction has high requirements for the reaction device. However, when conducting Si particle preparation research, due to the temperature error of the muffle furnace, the displayed temperature does not represent the actual temperature in the furnace, which can easily increase the failure rate of sample preparation;

[0004] To this end, the present invention provides a device for accurately controlling and measuring the temperature of a reaction system when an exothermic reaction occurs. Summary of the invention

[0005] The purpose of the present invention is to provide a device for preparing nano-silicon particles to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for preparing nano silicon particles, comprising:

[0008] A muffle furnace, wherein the muffle furnace is used to heat reaction raw materials, wherein the reaction raw materials include magnesium powder and silicon dioxide powder;

[0009] A stainless steel container, the stainless steel container is located in the muffle furnace, and the stainless steel container is used to hold reaction raw materials;

[0010] A thermocouple, one end of which is connected to the inside of the stainless steel container through a wire, and the other end of which is connected to a data collector;

[0011] A display is connected to the data collector.

[0012] Preferably, the preparation device further comprises a quartz tube passing through the muffle furnace, the stainless steel container is placed inside the quartz tube, and argon gas pipelines are provided at both ends of the quartz tube.

[0013] Preferably, both ends of the quartz tube are connected with rubber plugs, and the argon gas pipeline is inserted into the rubber plugs.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] A nano-silicon particle preparation device provided in an embodiment of the present invention uses a thermocouple to feedback the real-time reaction temperature of the reaction raw materials in a stainless steel container, and displays the real-time reaction temperature on a display after being processed by a data acquisition device, so that the staff can timely understand and monitor the real-time reaction temperature, which is conducive to improving the success rate of nano-silicon particle preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a device for preparing nano-silicon particles provided in an embodiment of the present invention.

[0017] In the figure: 1. Muffle furnace; 2. Stainless steel container; 3. Thermocouple; 4. Data acquisition device; 5. Display; 6. Quartz tube; 7. Argon gas pipeline; 8. Rubber stopper. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Figure 1 The present invention provides a schematic diagram of a device for preparing nano silicon particles according to an embodiment of the present invention. Figure 1 As shown, the preparation device of the nano silicon particles comprises:

[0020] A muffle furnace 1, the muffle furnace 1 is used to heat the reaction raw materials, the reaction raw materials include magnesium powder and silicon dioxide powder;

[0021] A stainless steel container 2, the stainless steel container 2 is located in the muffle furnace 1, and the stainless steel container 2 is used to contain reaction raw materials;

[0022] A thermocouple 3, one end of which is connected to the inside of the stainless steel container 2 through a wire, and the other end of which is connected to a data collector 4;

[0023] Display 5 , which is connected to data collector 4 .

[0024] In an embodiment of the present invention, the nano-silicon particle preparation device feeds back the real-time reaction temperature of the magnesium powder and the silicon dioxide powder in the stainless steel container 2 through the thermocouple 3, and displays the real-time reaction temperature on the display 5 after being processed by the data acquisition device 4, so that the staff can timely understand and monitor the real-time reaction temperature, which is conducive to improving the success rate of the preparation of nano-silicon particles.

[0025] In one embodiment of the present invention, the nano-silicon particle preparation device further includes a quartz tube 6 penetrating the muffle furnace 1, the stainless steel container 2 is placed inside the quartz tube 6, and argon gas pipelines 7 are provided at both ends of the quartz tube 6. The quartz tube 6 has high temperature resistance and good thermal stability, so that the high temperature required for the reduction reaction of magnesium powder and silicon dioxide powder can be met and maintained; before the reduction reaction starts, argon gas is introduced through the argon gas pipeline 7 to isolate the air and prevent the magnesium powder from undergoing oxidation reaction.

[0026] Further, in one embodiment of the present invention, both ends of the quartz tube 6 of the nano-silicon particle preparation device are connected with rubber plugs 8, and the argon gas pipeline 7 is inserted on the rubber plugs 8. The rubber plugs 8 can play a sealing role and further isolate air from entering.

[0027] Working principle:

[0028] After magnesium powder and silicon dioxide powder are configured in a proportion according to process requirements, they are placed in a stainless steel container 2 inside a quartz tube 6. After the rubber plugs 8 at both ends of the quartz tube 6 are installed in place, argon gas is introduced through an argon gas pipeline 7 to isolate the air to prevent the magnesium powder from undergoing an oxidation reaction. The muffle furnace 1 is turned on to heat the magnesium powder and the silicon dioxide powder. During the reduction reaction, the real-time reaction temperature of the magnesium powder and the silicon dioxide powder in the stainless steel container 2 is fed back through a thermocouple 3. After being processed by a data acquisition device 4, the real-time reaction temperature is displayed on a display 5, so that the staff can timely understand and monitor the real-time reaction temperature, which is beneficial to improving the success rate of the preparation of nano silicon particles.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing nano silicon particles, characterized in that: include: A muffle furnace (1), wherein the muffle furnace (1) is used to heat reaction raw materials, wherein the reaction raw materials include magnesium powder and silicon dioxide powder; A stainless steel container (2), the stainless steel container (2) is located in the muffle furnace (1), and the stainless steel container (2) is used to contain reaction raw materials; A thermocouple (3), one end of which is connected to the inside of the stainless steel container (2) via a wire, and the other end of which is connected to a data acquisition device (4); A display (5), wherein the display (5) is connected to the data collector (4).

2. The device for preparing nano silicon particles according to claim 1, characterized in that: The preparation device also includes a quartz tube (6) passing through the muffle furnace, the stainless steel container (2) is placed inside the quartz tube (6), and argon gas pipelines (7) are provided at both ends of the quartz tube (6).

3. The device for preparing nano silicon particles according to claim 2, characterized in that: Both ends of the quartz tube (6) are connected to rubber stoppers (8), and the argon gas pipeline (7) is inserted into the rubber stoppers (8).

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