Reaction vessel and method for manufacturing battery material

Abstract

To provide a reaction vessel and a method for manufacturing a battery material that can suppress deterioration of battery quality.SOLUTION: A reaction vessel according to the present disclosure is a reaction vessel for manufacturing a battery material, and includes a first supply port 11 that supplies at least one of raw materials for the a battery material and a reaction solution of the raw material to the reaction vessel, a second supply port 12 that supplies a cleaning solution for cleaning the battery material and the reaction vessel to the reaction vessel, an exhaust port 14 that exhausts gas from the reaction vessel, a temperature adjustment unit 15 that adjusts the temperature of the reaction vessel, an agitation unit 16 that agitates the inside of the reaction vessel, and a filter 17 capable of filtering the battery materials produced in the reaction vessel.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a reaction vessel and a method for manufacturing battery materials. [Background technology]

[0002] Patent Document 1 discloses a manufacturing method for manufacturing a battery material from an alloy through a plurality of steps. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-044620 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors have found the following problems. In the manufacturing method disclosed in the above-mentioned Patent Document 1, the battery materials are exposed to the air between each step, which results in a problem of deterioration in battery quality. There was a problem.

[0005] The present disclosure has been made in consideration of the above circumstances, and provides a reaction vessel and a method for manufacturing a battery material that can suppress deterioration of battery quality. [Means for solving the problem]

[0006] The reaction vessel according to the present disclosure is a reaction vessel for manufacturing a battery material, and includes a first supply port for supplying at least one of raw materials for the battery material and a reaction solution of the raw materials to the reaction vessel, a second supply port for supplying a cleaning solution for cleaning the battery material and the reaction vessel to the reaction vessel, an exhaust port for exhausting gas from the reaction vessel, a temperature adjustment unit for adjusting the temperature of the reaction vessel, an agitation unit for agitating the inside of the reaction vessel, and a filter capable of filtering the battery material produced in the reaction vessel.

[0007] The reaction vessel according to the present disclosure allows each step in the production of battery materials to be carried out within a single reaction vessel. This prevents the battery materials from being exposed to the atmosphere, thereby preventing deterioration of battery quality.

[0008] The reaction vessel may further include an air inlet port for supplying gas to the reaction vessel, and a control unit capable of changing a permeation rate indicating a rate at which the reaction liquid permeates the filter, and the control unit may change the permeation rate by controlling the amount of gas supplied from the air inlet port and the amount of gas exhausted from the exhaust port. With this configuration, the permeation rate can be changed, and the filtration time can be changed.

[0009] The control unit may increase the permeation rate by increasing the amount of gas supplied through the gas supply port and decreasing the amount of gas exhausted through the exhaust port. By adopting such a configuration, the permeation rate can be increased and the filtration time can be shortened.

[0010] The manufacturing method of a battery material according to the present disclosure is a manufacturing method of a battery material that uses a reaction vessel equipped with a first supply port, a second supply port, an exhaust port, a temperature adjustment unit, an agitation unit, and a filter, and includes: a supply step of supplying at least one of raw materials for the battery material and a reaction solution of the raw materials from the first supply port; a reaction step of reacting the raw materials for the battery material and the reaction solution of the raw materials while adjusting the temperature of the reaction vessel with the temperature adjustment unit and stirring the inside of the reaction vessel with the agitation unit, and exhausting gas from the reaction vessel through the exhaust port; a filtration step of filtering the battery material produced in the reaction vessel with the filter; a cleaning step of supplying a cleaning solution from the second supply port and cleaning the battery material and the reaction vessel with the cleaning solution; and a drying step of drying the reaction vessel and the battery material while adjusting the temperature of the reaction vessel with the temperature adjustment unit.

[0011] In the method for producing a battery material according to the present disclosure, each step can be carried out in a single reaction vessel, which prevents the battery material from being exposed to the atmosphere and thus prevents deterioration of the battery quality. [Effects of the Invention]

[0012] The present disclosure provides a reaction vessel and a method for manufacturing a battery material that can suppress deterioration of battery quality. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a cross-sectional view of a reaction vessel according to the first embodiment. [Figure 2] 1 is a flowchart showing an example of a method for producing porous silicon. [Figure 3] 1 is a system diagram showing an outline of a porous silicon manufacturing facility. [Figure 4] FIG. 1 is a schematic view showing a part of a reaction vessel during the production of porous silicon. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present disclosure will be described below through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential means for solving the problems. For clarity of explanation, the following description and drawings have been omitted and simplified as appropriate. In each drawing, the same elements are given the same reference numerals, and repeated explanations are omitted as necessary.

[0015] Naturally, the right-handed xyz Cartesian coordinate system shown in the drawings is for the convenience of explaining the positional relationships of the components. Normally, the positive direction of the z axis is vertically upward, and the xy plane is the horizontal plane.

[0016] (Embodiment 1) <Reaction vessel> The configuration of the reaction vessel according to embodiment 1 will be described below with reference to Fig. 1. Fig. 1 is a cross-sectional view of the reaction vessel according to embodiment 1. As shown in Fig. 1, the reaction vessel 10 includes a first supply port 11, a second supply port 12, an air supply port 13, an exhaust port 14, a temperature adjustment unit 15, a stirring unit 16, a filter 17, an outlet port 18, and a control unit. The reaction vessel 10 is a reaction vessel for producing battery materials.

[0017] The first supply port 11 is a supply port for supplying at least one of raw materials for the battery material and a reaction solution of the raw materials for the battery material to the reaction vessel 10. In the example shown in FIG. 1 , the first supply port 11 is composed of a supply port 111, a supply port 112, and a supply port 113.

[0018] The supply port 111 is a supply port for supplying raw materials for the battery material to the reaction vessel 10. The supply ports 112 and 113 are supply ports for supplying a reaction solution of the raw materials for the battery material to the reaction vessel 10. As shown in FIG. 1 , a plurality of first supply ports 11 may be provided depending on the types of raw materials for the battery material and the reaction solution of the raw materials for the battery material.

[0019] 1, three first supply ports 11 are provided in the reaction vessel 10 so that the raw materials for the battery materials (one type) and the reaction solutions of the raw materials for the battery materials (two types) can be separately supplied to the reaction vessel 10. However, this is not limited thereto, and two first supply ports 11 (supply port 112 and supply port 113) may be provided in the reaction vessel 10 so that the raw materials for the battery materials (one type) can be prepared in advance in the reaction vessel 10 and the reaction solutions of the raw materials for the battery materials (two types) can be separately supplied to the reaction vessel 10. Furthermore, the first supply port 11 may be a single supply port that supplies the raw materials for the battery materials and the reaction solutions of the raw materials for the battery materials, that is, a single supply port that combines the supply ports 111, 112, and 113.

[0020] The second supply port 12 is a supply port for supplying a cleaning liquid to the reaction vessel 10 for cleaning the battery materials and the reaction vessel 10. The second supply port 12 may have a spray nozzle shape to facilitate cleaning of the battery materials.

[0021] In the reaction vessel 10 shown in FIG. 1, at least one of the raw materials for the battery material and the reaction solution of the raw materials for the battery material (supplied from the first supply port 11) and a cleaning solution (supplied from the second supply port 12) are supplied separately to the reaction vessel 10.

[0022] However, the present invention is not limited to this, and the reaction vessel 10 may be provided with a single supply port that combines the first supply port 11 and the second supply port 12. In this case, at least one of raw materials for the battery material and a reaction solution of the raw materials for the battery material, and a cleaning solution are supplied to the reaction vessel 10 from the single supply port.

[0023] The gas supply port 13 is a gas supply port that supplies gas to the reaction vessel 10. For example, the gas supply port 13 and a gas supply source (not shown in FIG. 1) are connected by a pipe (not shown in FIG. 1). The gas supplied from the gas supply source is supplied to the reaction vessel 10 from the gas supply port 13 through the pipe. The gas supply source is, for example, a gas cylinder filled with gas.

[0024] The exhaust port 14 is an exhaust port that exhausts gas from the reaction vessel 10. For example, the exhaust port 14 and a vacuum pump (not shown in FIG. 1) are connected by piping (not shown in FIG. 1). The gas in the reaction vessel 10 is exhausted from the exhaust port 14 through the piping by drawing a vacuum using the vacuum pump.

[0025] As shown in Fig. 1, exhaust ports 14 are provided at the top and bottom of the reaction vessel 10. The exhaust port 14 at the bottom of the reaction vessel 10 also serves as an outlet port 18, which will be described later. The exhaust ports 14 at the top and bottom of the reaction vessel 10 are connected to a vacuum pump (not shown in Fig. 1) via piping (not shown in Fig. 1). Details will be described later with reference to Fig. 3.

[0026] The temperature adjustment unit 15 adjusts the temperature of the reaction vessel 10. For example, the temperature adjustment unit 15 and a cold heat source (not shown in FIG. 1) are connected by piping (not shown in FIG. 1). The temperature of cold water or hot water is adjusted by the cold heat source. Then, the cold water or hot water is supplied to the temperature adjustment unit 15 through the piping. In this way, the temperature adjustment unit 15 adjusts the temperature of the reaction vessel 10. Furthermore, as shown in FIG. 1, the temperature adjustment unit 15 has a triple-pipe structure.

[0027] The stirring unit 16 stirs the inside of the reaction vessel 10. More specifically, the stirring unit 16 is composed of a stirring blade 161, a stirring magnet 162, and a drive magnet 163. The drive magnet 163 rotates by the power of a motor (not shown in FIG. 1) attached to the bottom of the reaction vessel 10. The stirring magnet 162 rotates in accordance with the rotation of the drive magnet 163. Then, in accordance with the rotation of the stirring magnet 162, the stirring blade 161 rotates, stirring the inside of the reaction vessel 10. In this way, the stirring unit 16 stirs the inside of the reaction vessel 10 in a non-contact manner.

[0028] Here, the stirring force of the stirring unit 16 is determined by the product of the distance from the center of the reaction vessel 10 to the stirring magnet 162 and the attractive forces of the stirring magnet 162 and the drive magnet 163. Therefore, the closer the stirring magnet 162 is placed to the outer periphery of the reaction vessel 10, the greater the distance from the center of the reaction vessel 10 to the stirring magnet 162, and therefore the greater the stirring force of the stirring unit 16. Furthermore, the closer the distance between the stirring magnet 162 and the drive magnet 163 is made and the greater the attractive forces of the stirring magnet 162 and the drive magnet 163 are, the greater the stirring force of the stirring unit 16.

[0029] The filter 17 is a filter capable of filtering the battery materials produced in the reaction vessel. The battery materials are collected by the filter 17. On the other hand, the reaction liquid and cleaning liquid in which at least some of the raw materials of the battery materials are dissolved are passed through the filter 17.

[0030] The filter 17 is attached to a filter frame 171. The filter 17 can be removed from the filter frame 171 and replaced by sliding the upper part of the reaction vessel 10 above the filter frame 171 upward (positive direction of the z-axis). By removing the filter 17 from the filter frame 171, the collected battery material can be taken out from the reaction vessel 10. The filter 17 is removed from the filter frame 171 after performing a predetermined number of cycles of steps ST1 to ST7, which will be described later.

[0031] Outlet port 18 is an outlet port through which the liquid that has permeated filter 17 is discharged to the outside of the reaction vessel. For example, outlet port 18 and a drain tank (not shown in FIG. 1) are connected by piping (not shown in FIG. 1). The liquid that has permeated filter 17 is drained from outlet port 18 and stored in the drain tank through the piping.

[0032] The control unit changes the permeation rate, which indicates the rate at which the liquid permeates through the filter 17. The control unit is attached to the reaction vessel 10. The control unit is omitted from FIG. 1. More specifically, the control unit changes the permeation rate by controlling the amount of gas supplied from the gas supply port 13 and the amount of gas exhausted from the exhaust port 14. For example, the control unit increases the amount of gas supplied from the gas supply port 13 and decreases the amount of gas exhausted from the exhaust port 14, thereby increasing the permeation rate.

[0033] In addition, when the gas inlet port 13 and the gas exhaust port 14 of the reaction vessel 10 are configured to be equipped with electromagnetic valves, the control unit may be configured to control the amount of gas supplied from the gas inlet port 13 and the amount of gas exhausted from the exhaust port 14 by controlling the opening and closing of the electromagnetic valves. Of course, the control unit may be configured to control the amount of gas supplied from the gas inlet port 13 and the amount of gas exhausted from the exhaust port 14 by controlling the gas supply source to which the gas inlet port 13 of the reaction vessel 10 is connected and the vacuum pump to which the exhaust port 14 is connected.

[0034] <Battery material manufacturing method> Next, a method for manufacturing a battery material will be described with reference to Figs. 2 to 4. Here, a method for manufacturing porous silicon will be described as an example of a battery material. Fig. 2 is a flow chart showing an example of a method for manufacturing porous silicon. Fig. 3 is a system diagram showing an outline of a porous silicon manufacturing facility. Fig. 4 is a schematic diagram showing a part of a reaction vessel during the production of porous silicon. Below, the reaction vessel 10 in Fig. 1 will be referred to as appropriate.

[0035] <Preparation process> First, as shown in FIG. 2, preparations are made to supply raw materials for porous silicon and a reaction solution for the raw materials for porous silicon (step ST1).

[0036] Here, the exhaust port 14 will be described in detail. As shown in Fig. 1, the exhaust port 14 is provided at the top and bottom of the reaction vessel 10. The exhaust ports 14 provided at the top and bottom of the reaction vessel 10 are both connected to a vacuum pump P1 by piping. By operating the open / close states of valves V1 and V6 shown in Fig. 3, air can be exhausted from the top and bottom of the reaction vessel 10 through the exhaust port 14.

[0037] Step ST1 will be described in detail. With valves V1 and V6 shown in Fig. 3 open, a vacuum is drawn from the exhaust port 14 (see Fig. 1) using a vacuum pump P1. Then, with valve V2 shown in Fig. 3 open, an inert gas such as argon AR1 is supplied to the reaction vessel 10 from the gas supply port 13. This fills the inside of the reaction vessel 10 with the inert gas, ensuring that the reaction vessel 10 is sealed off from the atmosphere.

[0038] <Supply process> Next, the porous silicon raw material and the reaction solution of the porous silicon raw material are supplied (step ST2). The porous silicon raw material is, for example, a lithium-silicon alloy. The reaction solution of the porous silicon raw material is, for example, mesitylene E2 or ethanol E1, as shown in FIG. 3. Mesitylene E2 is a solvent for lithium-silicon. Ethanol E1 is a lithium extractant.

[0039] As shown in Fig. 3, the alloying device A1 supplies a lithium-silicon alloy to a reaction vessel 10. Hereinafter, the lithium-silicon alloy will be referred to as lithium-silicon. The lithium-silicon is supplied to the reaction vessel 10 from a supply port 111 (see Fig. 1). The lithium-silicon is supplied, for example, in the form of a slurry.

[0040] 3, mesitylene E2 is supplied to the reaction vessel 10 by a pump or the like (not shown in FIG. 3) with the valve V5 open. Mesitylene E2 is supplied to the reaction vessel 10 from the supply port 112 (see FIG. 1).

[0041] 3, ethanol E1 is supplied to the reaction vessel 10 by a pump or the like (not shown in FIG. 3) with the valve V4 open. The ethanol E1 is supplied to the reaction vessel 10 from a supply port 113 (see FIG. 1). It is preferable to provide two supply ports, namely, a supply port 112 (see FIG. 1) and a supply port 113 (see FIG. 1), so that mesitylene E2 and ethanol E1 can be supplied separately to the reaction vessel 10.

[0042] The upper part of FIG. 4 shows a state in which lithium-silicon Li—Si, ethanol E1, and mesitylene E2 are supplied to the reaction vessel 10.

[0043] Here, a configuration has been described in which the porous silicon raw material (lithium-silicon) and the porous silicon raw material reaction liquid (ethanol, mesitylene) are supplied. However, the present invention is not limited to this, and a configuration may be adopted in which either the porous silicon raw material or the porous silicon raw material reaction liquid is previously charged into the reaction vessel 10, and the other of the porous silicon raw material or the porous silicon raw material reaction liquid is supplied.

[0044] <Reaction process> Next, as shown in Fig. 2, the porous silicon raw material and the reaction solution of the porous silicon raw material are reacted (step ST3). More specifically, the temperature of the reaction vessel 10 is adjusted by the temperature adjustment unit 15 (see Fig. 1), while the inside of the reaction vessel 10 is stirred by the stirring unit 16 (see Fig. 1). In the example shown in Fig. 3, the reaction vessel 10 (temperature adjustment unit) and the cold heat source C1 are connected by piping.

[0045] The middle part of Fig. 4 shows the state in which lithium-silicon Li-Si and ethanol E1 are reacting inside the reaction vessel 10. As shown in the middle part of Fig. 4, the reaction between ethanol E1 and lithium-silicon Li-Si causes the lithium-silicon Li-Si to separate into lithium Li and silicon Si. In other words, the ethanol E1 extracts the lithium Li from the lithium-silicon Li-Si. The lithium Li then dissolves in the ethanol E1. Furthermore, the lithium Li reacts with the ethanol E1 to generate hydrogen H1.

[0046] As shown in Figure 3, in order to exhaust hydrogen H1 (see the middle part of Figure 4), valve V1 is opened, and with valve V6 closed, a vacuum is drawn from exhaust port 14 (see Figure 1). This also makes it possible to suppress the generation of bubbles at liquid level M1 (see the middle part of Figure 4) due to hydrogen H1 (see the middle part of Figure 4). Furthermore, in order to reduce the heat of reaction between lithium Li and ethanol E1, the temperature of reaction vessel 10 is lowered by temperature adjustment unit 15 (see Figure 1).

[0047] <Filtration process> Next, as shown in FIG. 2, the porous silicon produced in the reaction vessel 10 is filtered by the filter 17 (see FIG. 1) (step ST4). The lower part of FIG. 4 shows the state in which the porous silicon P—Si produced inside the reaction vessel 10 has been filtered. As shown in the lower part of FIG. 4, the porous silicon P—Si is collected in the filter 17 (see FIG. 1). On the other hand, the ethanol E1 and mesitylene E2 in which lithium Li has been dissolved pass through the filter 17 (see FIG. 1). In this way, the porous silicon P—Si is separated from the ethanol E1 and mesitylene E2 by the filter 17 (see FIG. 1), and the porous silicon P—Si is filtered.

[0048] In addition, in the filtering step of step ST4, the control unit may perform filtering by increasing the filtering speed. More specifically, with valve V1 shown in Fig. 3 closed and valve V6 open, vacuum is drawn from exhaust port 14 (see Fig. 1). With valve V2 shown in Fig. 3 open, an inert gas such as argon AR1 is supplied to reaction vessel 10 through air supply port 13 (see Fig. 1).

[0049] That is, the control unit increases the amount of gas supplied from the gas supply port 13 (see FIG. 1) to pressurize the filter 17 (see FIG. 1) from above. The control unit decreases the amount of gas exhausted from the exhaust port 14 (see FIG. 1) at the bottom of the reaction vessel 10 to depressurize the filter 17 (see FIG. 1) from below. This allows the control unit to improve the filtration speed and shorten the filtration time.

[0050] The control unit increases the amount of gas supplied from the gas supply port 13 (see FIG. 1) to pressurize the upper part of the filter 17 (see FIG. 1). The control unit decreases the amount of gas exhausted from the exhaust port 14 (see FIG. 1) at the top of the reaction vessel 10. That is, the control unit controls the amount of gas supplied from the gas supply port 13 and the amount of gas exhausted from the exhaust port 14 at the top of the reaction vessel 10 so that the amount of gas supplied exceeds the amount of gas exhausted, thereby pressurizing the reaction vessel 10. Even with this configuration, the control unit can improve the filtration speed and therefore shorten the filtration time.

[0051] In this way, the control unit can change the permeation rate by controlling the amount of gas supplied from the gas supply port 13 and the amount of gas exhausted from the exhaust port 14.

[0052] Furthermore, in the filtering step of step ST4, in order to reduce the particle size of lithium Li that passes through filter 17 (see FIG. 1), stirring may be performed by stirrer 16 until just before the filtering step. This configuration also allows the filtration time to be shortened.

[0053] In the filtration step of step ST4, the ethanol E1 and mesitylene E2 that have permeated the filter 17 flow out of the reaction vessel 10 from the outlet port 18, as shown in Fig. 3. As shown in Fig. 3, the ethanol E1 and mesitylene E2 that have flowed out from the outlet port 18 are stored in the wastewater tank 30.

[0054] <Cleaning process> Next, as shown in FIG. 2, a cleaning liquid is supplied from the second supply port to clean the inside of the reaction vessel 10 and the porous silicon P—Si (step ST5). The cleaning liquid is, for example, acetone. More specifically, with the valve V3 shown in FIG. 3 open, acetone E3 is supplied to the reaction vessel 10 by a pump or the like (not shown in FIG. 3). Then, the stirring unit 16 (see FIG. 1) stirs the inside of the reaction vessel 10. This allows the slurry-like lithium-silicon Li—Si adhering to the inside of the reaction vessel 10 to be removed.

[0055] Furthermore, in the cleaning step of step ST5, even if the porous silicon P—Si is collected in the filter 17 (see FIG. 1), it is stirred up into the acetone E3 by the agitator 16 (see FIG. 1). As a result, the porous silicon P—Si is cleaned. After cleaning, the density of the porous silicon P—Si is greater than the density of acetone E3, so the porous silicon P—Si is again collected in the filter 17 (see FIG. 1).

[0056] <Drying process> Next, as shown in Fig. 2, the reaction vessel and the battery materials are dried (step ST6). More specifically, the reaction vessel 10 and the porous silicon P-Si are dried while adjusting the temperature of the reaction vessel 10 using the temperature adjustment unit 15 (see Fig. 1). Alternatively, with the valves V1 and V6 shown in Fig. 3 open, a vacuum may be drawn through the exhaust port 14 (see Fig. 1). This lowers the boiling point of acetone E3, making it easier for acetone E3 to evaporate.

[0057] Then, in the drying step of step 6, as shown in Fig. 3, acetone E3 flows out of the reaction vessel 10 from the outlet port 18 (see Fig. 1). As shown in Fig. 3, the acetone E3 flowing out from the outlet port 18 (see Fig. 1) is stored in the drainage tank 30.

[0058] As described above, in the method for producing a battery material according to the first embodiment, steps 1 to 6 can be carried out in one reaction vessel 10. This makes it possible to prevent the porous silicon, which is the battery material, from being exposed to the atmosphere. Therefore, in the method for producing a battery material according to the first embodiment, it is possible to prevent deterioration of the battery quality.

[0059] <Comparison with conventional battery material manufacturing methods> In the conventional battery material manufacturing method, steps 2 to 6 are each performed using separate manufacturing equipment. That is, in the conventional battery material manufacturing method, the manufacturing equipment is switched in the order of steps 2 to 6.

[0060] Therefore, in the conventional manufacturing method of battery materials, the battery materials are exposed to the atmosphere between each step, which results in a problem of deterioration in the quality of the battery.

[0061] Furthermore, in conventional battery material manufacturing methods, containers are sometimes replaced with new ones while some of the material from the previous process remains, and the next process is then carried out. This can lead to cross-contamination between the materials from the previous process and the materials from the next process, or to changes in the reaction ratios for producing the battery material in the next process. As a result, conventional battery material manufacturing methods have been unable to produce battery materials of accurate quality and quantity.

[0062] Furthermore, conventional methods for manufacturing battery materials required cleaning the inside of the manufacturing equipment for each process to avoid cross-contamination, which had the disadvantage of requiring time and effort as well as running costs for cleaning solutions.

[0063] Furthermore, in conventional battery material manufacturing methods, silicon oxide is formed when silicon Si is exposed to the container during standby after the reaction step (Step 3). Therefore, in conventional battery material manufacturing methods, a reaction solution that prevents gelation, such as acetic acid, is supplied to suppress the formation of silicon oxide.

[0064] However, in the method for producing a battery material according to embodiment 1, there is no need to switch production equipment between steps 1 to 6. In other words, in the method for producing a battery material according to embodiment 1, each step can be performed in a single reaction vessel. This makes it possible to prevent the battery material from being exposed to the atmosphere between steps. As a result, the method for producing a battery material according to embodiment 1 makes it possible to prevent deterioration of battery quality.

[0065] Furthermore, in the method for producing a battery material according to embodiment 1, no switching of production equipment is required between steps 1 to 6. Therefore, in the method for producing a battery material according to embodiment 1, there is no risk of materials from a previous step remaining and being used to carry out the next step. This prevents cross-contamination between materials from the previous step and materials in the next step, and prevents changes in the reaction ratios for producing the battery material in the next step. Therefore, the method for producing a battery material according to embodiment 1 allows battery materials to be produced with precision in both quality and quantity.

[0066] Furthermore, the method for producing a battery material according to embodiment 1 only requires the washing step of step 5, and no washing is required between each step, which reduces the labor and running costs for washing solutions.

[0067] Furthermore, in the method for producing a battery material according to embodiment 1, there is no need to switch production equipment between steps 1 to 6. This eliminates the risk of silicon Si being exposed to light during standby and forming silicon oxide. Therefore, the method for producing a battery material according to embodiment 1 does not require a reaction solution that prevents gelation, such as acetic acid, and the running costs for producing the battery material can be reduced.

[0068] In the method for producing a battery material according to embodiment 1, no switching of production equipment is required between steps 1 to 6. Therefore, the method for producing a battery material according to embodiment 1 can improve the yield.

[0069] 2 to 4 described above, porous silicon is used as an example of a battery material, and a method for producing a battery material using the reaction vessel 10 of FIG. 1 has been described. However, the reaction vessel 10 according to the first embodiment is not limited to being used in a method for producing porous silicon from a lithium-silicon alloy. The reaction vessel 10 according to the first embodiment may also be used in a method for producing porous silicon from an alloy such as magnesium (Mg)-silicon (Si). Furthermore, the reaction vessel according to the first embodiment may also be used in the production of a battery material that oxidizes when exposed to the atmosphere.

[0070] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure. [Explanation of symbols]

[0071] 10 Reaction vessel 11 First supply port 12 Second supply port 13 Air supply port 14 Exhaust port 15 Temperature adjustment section 16 Stirring section 17 Filters 18 Outlet Port 19 Control Unit 30 Drainage tank 111, 112, 113 supply ports 161 Stirring blade 162 Stirring magnet 163 Drive magnet 171 Filter Frame A1 Alloying equipment C1 Cold source AR1 Argon E1 Ethanol E2 Mesitylene E3 Acetone H1 Hydrogen Lithium Li―Si Lithium-Silicon M1 liquid level P―Si Porous silicon Si Silicon V1 to V6 valves

Claims

1. A reaction vessel for producing a battery material, a first supply port for supplying at least one of raw materials of battery materials and a reaction solution of the raw materials to the reaction vessel; a second supply port that supplies a cleaning solution to the reaction vessel for cleaning the battery material and the reaction vessel; an exhaust port for exhausting gas from the reaction vessel; a temperature adjusting unit that adjusts the temperature of the reaction vessel; a stirring unit that stirs the inside of the reaction vessel; a filter capable of filtering the battery material produced in the reaction vessel; Equipped with Reaction vessel.

2. an air supply port for supplying gas to the reaction vessel; a control unit capable of changing a permeation rate indicating a rate at which the reaction liquid permeates the filter; the control unit changes the permeation rate by controlling the amount of gas supplied from the gas supply port and the amount of gas exhausted from the exhaust port. The reaction vessel according to claim 1 .

3. the control unit increases the amount of gas supplied from the gas supply port and decreases the amount of gas exhausted from the exhaust port, thereby increasing the permeation rate. The reaction vessel according to claim 2.

4. A method for producing a battery material using a reaction vessel including a first supply port, a second supply port, an exhaust port, a temperature adjustment unit, a stirring unit, and a filter, the method comprising: a supply step of supplying at least one of raw materials for a battery material and a reaction solution of the raw materials from the first supply port; a reaction step of reacting raw materials of a battery material with a reaction solution of the raw materials while adjusting the temperature of the reaction vessel by the temperature adjusting unit and stirring the inside of the reaction vessel by the stirring unit, and exhausting gas from the reaction vessel through the exhaust port; a filtering step of filtering the battery material produced in the reaction vessel with the filter; a cleaning step of supplying a cleaning liquid from the second supply port and cleaning the battery material and the reaction vessel with the cleaning liquid; a drying step of drying the reaction vessel and the battery material while adjusting the temperature of the reaction vessel by the temperature adjustment unit; Equipped with Manufacturing methods for battery materials.

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