Sodium electric positive electrode material precursor synthesis device and sodium electric positive electrode material synthesis equipment

Abstract

The present disclosure provides a sodium battery positive electrode material precursor synthesis device and a sodium battery positive electrode material synthesis device. The sodium battery positive electrode material precursor synthesis device comprises a main reactor, a secondary reactor, a concentrator, a seed tank, a transfer tank and a centrifuge. The main reactor is formed with multiple feeding pipes, and an overflow port is formed at the top of the main reactor. The feeding port at the top of the secondary reactor is communicated with the overflow port, and the horizontal height of the feeding port is lower than that of the overflow port. The discharge port at the bottom of the secondary reactor is communicated with the main reactor through the concentrator. The seed tank is communicated with the main reactor, and the seed tank is used for placing small seed crystals with uniform particle size. The transfer tank is communicated with the concentrator. The centrifuge is communicated with the transfer tank. The device can prepare a sodium battery positive electrode material precursor with good uniformity, regular morphology and high pass rate.

Description

Technical Field

[0001] This disclosure relates to the field of sodium electrode material technology, and in particular to a sodium electrode material precursor synthesis apparatus and sodium electrode material synthesis equipment. Background Technology

[0002] Generally, the common methods for synthesizing sodium-ion cathode material precursors are continuous coprecipitation and intermittent coprecipitation. Intermittent coprecipitation suffers from low production efficiency, while continuous coprecipitation produces precursors with numerous microparticles on their surface, leading to uneven particle size and affecting the electrical properties of the sodium-ion cathode material.

[0003] Therefore, some scholars have proposed a production method similar to the ternary material precursor production system disclosed in Chinese Patent Document No. CN 112216835 B. By adjusting parameters such as temperature, pH value and stirring rate of the reaction system, the nucleation process can be precisely controlled and the target substance can be oriented to precipitate. That is, it mainly relies on the supersaturation of the solution for spontaneous nucleation.

[0004] However, when the solution system is in a highly supersaturated state, nucleation kinetics dominate, with a rate constant far exceeding that of the crystal growth process. This results in the formation of excessive crystal nuclei per unit time and a dramatic consumption of solute. As the solute concentration gradient flattens, the growth driving force decays exponentially, causing a large number of newly formed crystal nuclei to lose the conditions for continued development. While the initially formed crystal nuclei can grow sufficiently during the relatively solute-rich stage, the subsequently formed crystal nuclei are limited by the solute-depleted environment and cannot grow sufficiently. This leads to the final precursor particles exhibiting a dual distribution of "densely numerous small-sized particles" and "sparsely distributed large-sized particles," resulting in poor precursor particle size uniformity and a low precursor yield. For details, please refer to Figure 4 of the literature, which shows a large number of small-particle precursors. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a sodium electrode cathode material precursor synthesis apparatus and sodium electrode material synthesis equipment with good particle size uniformity, regular morphology and high yield.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] An apparatus for synthesizing sodium-ion cathode material precursors.

[0008] The main reactor has multiple feed pipes and an overflow port at the top.

[0009] The secondary reactor has a feed inlet at the top connected to the overflow outlet, and the feed inlet is at a lower level than the overflow outlet.

[0010] The concentrator is connected to the main reactor via the discharge port at the bottom of the secondary reactor.

[0011] A seed tank is connected to the main reactor and is used to place small seed crystals with uniform particle size.

[0012] The transfer tank is connected to the concentrator;

[0013] Centrifuge, connected to the transfer tank.

[0014] In one embodiment, the amount of the small seed crystals added is 1% to 10% of the mass percentage of the slurry.

[0015] In one embodiment, the overflow port is connected to the feed port of the secondary reactor via a pipeline.

[0016] In one embodiment, the pipeline is arranged to gradually slope downwards from the end closest to the main reactor to the end furthest from the main reactor.

[0017] In one embodiment, the tilt angle is 10°-55°.

[0018] In one embodiment, the sodium-ion cathode material precursor synthesis apparatus further includes multiple batching tanks, each of which is connected to the main reactor.

[0019] In one embodiment, there are three mixing tanks: a metal mixing tank, an ammonia tank, and a liquid alkali tank; there are three feed pipes, and the metal mixing tank, the ammonia tank, and the liquid alkali tank are connected to each feed pipe in a one-to-one correspondence.

[0020] In one embodiment, the sodium-ion cathode material precursor synthesis apparatus further includes a feed pipe and a pump. The feed pipe is disposed at the bottom of the main reactor, and the main reactor is connected to the secondary reactor through the feed pipe. The pump is disposed on the feed pipe.

[0021] In one embodiment, the sodium-ion cathode material precursor synthesis apparatus further includes a rotary kiln and a vibrating sieve, the vibrating sieve being connected to the centrifuge via the rotary kiln.

[0022] A sodium-ion cathode material synthesis apparatus, comprising the sodium-ion cathode material precursor synthesis apparatus described in any of the above embodiments.

[0023] Compared with the prior art, this disclosure has at least the following advantages:

[0024] 1) During use, the main reactor has multiple feed pipes, allowing different raw materials to enter the main reactor in batches through these pipes for mixing to obtain a slurry. Then, the seed tank is connected to the main reactor and is used to place small, uniformly sized seeds. These seeds can be fed into the main reactor for mixing, providing a crystalline substrate for the slurry. The surface of the uniformly sized seeds can adsorb solute molecules, accelerating solute deposition on their surface and reducing the probability of spontaneous nucleation under supersaturated conditions. This effectively suppresses the formation of new nuclei of different sizes, contributing to the preparation of precursor particles with uniform particle size, regular morphology, and high yield.

[0025] 2) As the liquid level in the main reactor increases, an overflow port is formed at the top of the main reactor. The feed port at the top of the secondary reactor is connected to the overflow port, and the horizontal height of the feed port is lower than that of the overflow port. This allows the main reactor to overflow into the secondary reactor, thereby ensuring that the slurry stays in the main reactor and the secondary reactor for a longer time during early nucleation. This further ensures that the precursor crystals produced have fewer defects and a narrower particle size distribution, which helps to improve the consistency and compaction density of the sodium electrode cathode material. In addition, the addition of the secondary reactor can effectively reduce the probability of spontaneous nucleation in the solution, which helps to generate precursors with fewer crystal defects and a narrower particle size distribution.

[0026] 3) When the secondary reactor reaches the preset liquid level, the discharge port at the bottom of the secondary reactor is connected to the main reactor through the thickener, allowing the slurry in the secondary reactor to be pumped into the thickener for concentration to remove a small amount of clear liquid, and then returned to the main reactor. This cycle continues continuously between the main reactor, the secondary reactor, and the thickener until the preset time has elapsed. Then, because the transfer tank is connected to the thickener, the thickener discharges the slurry into the transfer tank for aging. The slurry after aging will enter a centrifuge for centrifugal filtration, and the resulting filter residue is the precursor of the sodium-ion battery cathode material. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the circulation of the main reactor, secondary reactor, and concentrator according to an embodiment of the present invention;

[0029] Figure 2This is a schematic diagram of the structure of a sodium-ion cathode material precursor synthesis device according to an embodiment of the present invention;

[0030] Figure 3 for Figure 2 A magnified view of the area shown at point A in the middle.

[0031] Figure reference numerals: 10, Sodium-ion cathode material precursor synthesis device; 100, Main reactor; 110, Feed pipe; 120, Overflow port; 200, Secondary reactor; 300, Concentrator; 400, Seed tank; 500, Transfer tank; 600, Centrifuge; 710, Metal mixing tank; 720, Ammonia tank; 730, Liquid alkali tank; 810, Feed pipe; 820, Extraction pump; 910, Rotary kiln; 911, Hot kiln zone; 9111, Exhaust fan; 9112, Cyclone separator; 912, Cold kiln ambient temperature zone; 920, Vibrating sieve. Detailed Implementation

[0032] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0036] Please refer to 1 to Figure 3An embodiment of a sodium-ion battery cathode material precursor synthesis apparatus 10 includes a main reactor 100, a secondary reactor 200, a concentrator 300, a seed tank 400, a transfer tank 500, and a centrifuge 600. The main reactor 100 has multiple feed pipes 110, and an overflow port 120 is formed at its top. The feed port at the top of the secondary reactor 200 is connected to the overflow port 120, and the horizontal height of the feed port is lower than the horizontal height of the overflow port 120. The discharge port at the bottom of the secondary reactor 200 is connected to the main reactor 100 through the concentrator 300. The seed tank 400 is connected to the main reactor 100 and is used to place small, uniformly sized seed crystals. The transfer tank 500 is connected to the concentrator 300, and the centrifuge 600 is connected to the transfer tank 500.

[0037] It is understood that during use, since the main reactor 100 has multiple feed pipes 110, different raw materials can enter the main reactor 100 in batches through multiple feed pipes 110 for mixing to obtain a slurry. Then, since the seed tank 400 is connected to the main reactor 100, the seed tank 400 is used to place small crystals with uniform particle size, so that the small crystals with uniform particle size in the seed tank 400 can be fed into the main reactor 100 for mixing. The small crystals with uniform particle size can provide a crystallization substrate for the slurry in the main reactor 100, and the surface of the small crystals with uniform particle size can adsorb solute molecules, accelerate the deposition of solute on its surface, reduce the probability of spontaneous nucleation under supersaturation of solution, effectively suppress the generation of new crystal nuclei of different particle sizes, and help to prepare precursor particles with uniform particle size, regular morphology and high qualification rate.

[0038] Next, as the liquid level in the main reactor 100 increases, an overflow port 120 is formed at the top of the main reactor 100. The feed port at the top of the secondary reactor 200 is connected to the overflow port 120, and the horizontal height of the feed port is lower than the horizontal height of the overflow port 120. This allows the main reactor 100 to overflow into the secondary reactor 200, thereby ensuring that the slurry stays in the main reactor 100 and the secondary reactor 200 for a longer time during early nucleation. This further ensures that the precursor crystals produced have fewer defects and a narrower particle size distribution, which helps to improve the consistency and compaction density of the sodium electrode cathode material. In addition, the addition of the secondary reactor 200 can effectively reduce the probability of spontaneous nucleation in the solution, which helps to generate precursors with fewer crystal defects and a narrower particle size distribution.

[0039] Following this, once the secondary reactor 200 reaches the preset liquid level, the slurry in the secondary reactor 200 is fed into the thickener 300 for concentration to remove a small amount of clear liquid, as the outlet at the bottom of the secondary reactor 200 is connected to the main reactor 100 via the thickener 300. This process continues until the slurry returns to the main reactor 100. This cycle continues continuously between the main reactor 100, the secondary reactor 200, and the thickener 300 until the preset time has elapsed. Then, the transfer tank 500 is connected to the thickener 300, allowing the thickener 300 to discharge the slurry into the transfer tank 500 for aging. The aged slurry then enters the centrifuge 600 for centrifugal filtration, and the resulting filter residue is the precursor for the sodium-ion battery cathode material.

[0040] In one embodiment, the thickener 300 discharges material every 0.5-1 hour, so that the concentrated slurry enters the transfer tank 500 for aging.

[0041] like Figure 2 As shown, in one embodiment, the sodium-ion cathode material precursor synthesis apparatus 10 further includes multiple batching tanks, each of which is connected to the main reactor 100 to achieve the individual preparation of different raw materials.

[0042] In one embodiment, the size of the uniformly sized seed crystals can be selected according to the actual production needs of the operator. Specifically, the uniform particle size can be 100nm-500nm. Further, the operator can select particle sizes of 100nm, 110nm, 120nm, 130nm, 140nm, 200nm, 250nm, 300nm, 320nm, 400nm, ..., 500nm.

[0043] like Figure 2 As shown, in one embodiment, there are three mixing tanks: a metal mixing tank 710, an ammonia tank 720, and a liquid alkali tank 730. There are also three feed pipes 110. The metal mixing tank 710, the ammonia tank 720, and the liquid alkali tank 730 are connected to each feed pipe 110 in a one-to-one manner, so that the metal mixing tank 710, the ammonia tank 720, and the liquid alkali tank 730 can enter the main reactor 100 through the corresponding feed pipes 110 to prepare for the preparation of slurry.

[0044] In one embodiment, the molten metal in the metal mixing tank 710 is obtained by mixing pure water, nickel sulfate, ferric sulfate, manganese sulfate, and a solution of a doped metal M salt in a certain proportion. It is worth noting that the formulation of the molten metal and the aging treatment conditions in the transfer tank 500 are both prior art. Therefore, they are not specifically described in this disclosure.

[0045] In one embodiment, the amount of small seed crystals added accounts for 1% to 10% of the mass percentage of the slurry to ensure that the amount of small seed crystals added is relatively appropriate. In this way, while reducing the probability of spontaneous nucleation under supersaturation, it also ensures the rapid generation of sodium-ion cathode material precursors with uniform particle size and qualified quality within a preset time. This effectively avoids the problem that adding too many small seed crystals will prevent the rapid generation of sodium-ion cathode material precursors with uniform particle size and qualified quality within a preset time. At the same time, it also effectively avoids the problem that adding too few small seed crystals will prevent the slurry from having enough crystalline substrate, resulting in the probability of spontaneous nucleation under supersaturation in the solution, which would lead to poor particle size uniformity of the precursor and a low precursor qualification rate.

[0046] like Figure 3 As shown, in one embodiment, the overflow port 120 is connected to the feed port of the secondary reactor 200 via a pipeline to realize the overflow setting of slurry between the main reactor 100 and the secondary reactor 200.

[0047] like Figure 3 As shown, in one embodiment, the pipeline is arranged with a gradual downward inclination from the end near the main reactor 100 to the end away from the main reactor 100, to ensure that the slurry in the reactor can flow well into the secondary reactor 200. Specifically, in one embodiment, the angle of the inclination is 10°-55°.

[0048] It should be noted that since the overflow port 120 is located at the top of the main reactor 100, when the liquid level in the main reactor 100 drops to the overflow port 120, the slurry in the main reactor 100 cannot flow into the secondary main reactor 100 completely, that is, there is a discharge blind zone in the main reactor 100. Therefore, in one embodiment, the sodium-ion cathode material precursor synthesis apparatus 10 further includes a feed pipe 810 and a pump 820. The feed pipe 810 is disposed at the bottom of the main reactor 100, and the main reactor 100 is connected to the secondary reactor 200 through the feed pipe 810. The pump 820 is disposed on the feed pipe 810. When the raw materials are added in batches and the liquid level of the main reactor 100 drops to the overflow port 120, the pump 820 can be started to pump all the slurry below the overflow port 120 of the main reactor 100 into the secondary reactor 200, and then pumped into the thickener 300 for concentration and discharge to the transfer tank 500, effectively reducing the discharge blind zone of the main reactor 100.

[0049] It should also be noted that during the initial nucleation stage, due to the high concentration of the material mixture, the slurry system is prone to supersaturation, and the liquid level in the reactor is also high. At this time, natural overflow can be maintained between the main and secondary reactors 200. However, as the reaction progresses, especially after the raw materials are completely added in the final stage, when the liquid level in the main reactor 100 drops below the overflow port 120, the original overflow mechanism will no longer function properly. During this stage, the slurry in the main reactor 100 has completed the standard growth process of the precursor grains, enabling the added conveying pipes 810 and the extraction pump 820 to completely empty the residual slurry in the main reactor 100, thereby significantly improving the precursor production efficiency.

[0050] Of course, in other embodiments, the main reactor 100 can be connected to the transfer tank 500 through a pipeline to completely drain the residual slurry in the main reactor 100.

[0051] It is understandable that the sodium-ion cathode material precursor still contains residual moisture and small particulate matter after filtration by centrifuge 600. Therefore, in one embodiment, the sodium-ion cathode material precursor synthesis apparatus 10 further includes a rotary kiln 910 and a vibrating sieve 920. The vibrating sieve 920 is connected to the centrifuge 600 through the rotary kiln 910, enabling the added rotary kiln 910 to achieve better drying of the sodium-ion cathode material precursor and effectively remove residual moisture. The added vibrating sieve 920 can screen out unqualified particle sizes to ensure the preparation of sodium-ion cathode material precursors with uniform particle size and high pass rate.

[0052] In one embodiment, the rotary kiln 910 includes a hot kiln zone 911 and a cold kiln ambient temperature zone 912 that are interconnected. Specifically, the hot kiln zone 911 is a multi-stage drying zone with a temperature of 320.0℃-330.0℃. For example, the temperature of the first stage is 320.0℃; the temperature of the second stage is 330℃; the temperature of the third stage is 300℃; the temperature of the fourth stage is 300℃; the temperature of the fifth stage is 295℃; and the temperature of the sixth stage is 290℃. The conveying rate of the hot kiln zone 911 is 2.55 rpm to 3.85 rpm to achieve better drying of the sodium-ion battery cathode material precursor, thereby effectively removing residual moisture from the precursor. In particular, in conjunction with the conveying rate of the cold kiln ambient temperature zone 912, which is 2.10 rpm to 3.05 rpm, the zone can achieve better cooling of the dried sodium-ion battery cathode material precursor.

[0053] like Figure 2As shown, in one embodiment, the rotary kiln 910 further includes an induced draft fan 9111 and a cyclone separator 9112. The induced draft fan 9111 and the cyclone separator 9112 are respectively connected to the furnace head disposed in the hot kiln zone 911. In this way, some of the sodium-ion cathode material precursor particles that are raised in the hot kiln zone 911 are raised by the induced draft fan 9111 and enter the cyclone separator 9112. Since the cyclone separator 9112 separates the sodium-ion cathode material precursor particles with a particle size of less than 0.1 micrometers, the sodium-ion cathode material precursor particles with a qualified particle size return to the furnace head zone for drying, thereby improving the product yield of sodium-ion cathode material precursors.

[0054] In this disclosure, sodium-ion battery cathode material precursors with a particle size of less than 0.1 micrometers are ground and air-flow sieved to obtain small seed crystals with a uniform particle size of 80nm-90nm. These uniform seed crystals are then stored in a seed tank 400 for later use. This not only improves the recycling of sodium-ion battery cathode material precursors with a particle size of less than 0.1 micrometers and simplifies the operation, but also shortens the nucleation time of the subsequent sodium-ion battery cathode material precursors, thereby improving the preparation efficiency of sodium-ion battery cathode material precursors. At the same time, the addition of uniform seed crystals can provide a crystallization substrate for the slurry in the main reactor 100, and the surface of the uniform seed crystals can adsorb solute molecules, accelerating the deposition of solutes on their surface, reducing the probability of spontaneous nucleation under supersaturated solution conditions, and effectively suppressing the generation of new crystal nuclei of different particle sizes. This helps to prepare precursor particles with uniform particle size, regular morphology, and high yield.

[0055] In one embodiment, the vibrating sieve 920 has an amplitude of 4mm-6mm, a frequency of 700-900 times / min, and a mesh size of 2000-2500 to effectively remove larger particles of sodium-ion cathode material precursor, thereby ensuring that sodium-ion cathode material precursor with uniform particle size is obtained, that is, the D50 of sodium-ion cathode material precursor is 5um-8um, and the specific surface area is 0.5m2 / g-1.0m2 / g.

[0056] Similarly, in one embodiment, the sodium-ion cathode material precursor with larger particles is ground and air-flow sieved to obtain small seed crystals with uniform particle size of 100nm-500nm, and the small seed crystals with uniform particle size are stored in the seed cell 400 for later use.

[0057] It should be noted that, since the particle size of small crystals with uniform particle size of 80nm-90nm is smaller than that of small crystals with uniform particle size of 100nm-500nm, under the same phase addition conditions, when small crystals with uniform particle size of 80nm-90nm are selected, small particle agglomeration is more likely to occur in the main reactor 100, that is, poor dispersibility. Therefore, in this disclosure, small crystals with uniform particle size of 100nm-500nm are preferred to effectively reduce the problem of small particle agglomeration, thereby facilitating the preparation of precursor particles with uniform particle size, regular morphology and high yield.

[0058] This disclosure also provides a sodium-ion battery cathode material synthesis apparatus, including the sodium-ion battery cathode material precursor synthesis apparatus 10 described in any of the above embodiments. The sodium-ion battery cathode material synthesis apparatus further includes a sintering device, in which the sodium-ion battery cathode material precursor, sodium salt, and coating material of this disclosure are mixed to obtain a mixture. The mixture is then placed in the sintering device for high-temperature sintering. Following this, the high-temperature sintered mixture is ground and sieved to obtain the sodium-ion battery cathode material required for production. This sodium-ion battery cathode material not only has uniform particle size but also regular morphology, thereby improving the consistency and compaction density of the sodium-ion battery cathode material.

[0059] Compared with the prior art, this disclosure has at least the following advantages:

[0060] 1) During use, since the main reactor 100 has multiple feed pipes 110, different raw materials can enter the main reactor 100 in batches through multiple feed pipes 110 to mix and obtain a slurry; then, since the seed tank 400 is connected to the main reactor 100, the seed tank 400 is used to place small crystals with uniform particle size, so that the small crystals with uniform particle size in the seed tank 400 can be fed into the main reactor 100 for mixing, so that the added small crystals with uniform particle size can provide a crystallization substrate for the slurry in the main reactor 100, and the surface of the small crystals with uniform particle size can adsorb solute molecules, accelerate the deposition of solute on its surface, reduce the probability of spontaneous nucleation under supersaturation of solution, effectively suppress the generation of new crystal nuclei of different particle sizes, and help to prepare precursor particles with uniform particle size, regular morphology and high qualification rate.

[0061] 2) As the liquid level in the main reactor 100 increases, an overflow port 120 is formed at the top of the main reactor 100. The feed port at the top of the secondary reactor 200 is connected to the overflow port 120, and the horizontal height of the feed port is lower than the horizontal height of the overflow port 120. This allows the main reactor 100 to overflow into the secondary reactor 200, thereby ensuring that the slurry stays in the main reactor 100 and the secondary reactor 200 for a longer period during early nucleation. This further ensures that the precursor crystals produced have fewer defects and a narrower particle size distribution, which helps to improve the consistency and compaction density of the sodium electrode cathode material. In addition, the addition of the secondary reactor 200 can effectively reduce the probability of spontaneous nucleation in the solution, which helps to generate precursors with fewer crystal defects and a narrower particle size distribution.

[0062] 3) When the secondary reactor 200 reaches the preset liquid level, the discharge port at the bottom of the secondary reactor 200 is connected to the main reactor 100 through the thickener 300, allowing the slurry in the secondary reactor 200 to be pumped into the thickener 300 for concentration to remove a small amount of clear liquid, and then returned to the main reactor 100. This cycle continues continuously between the main reactor 100, the secondary reactor 200, and the thickener 300 until the preset time has elapsed. Then, because the transfer tank 500 is connected to the thickener 300, the thickener 300 discharges the slurry into the transfer tank 500 for aging. The slurry after aging will enter the centrifuge 600 for centrifugal filtration, and the resulting filter residue is the precursor of the sodium-ion battery cathode material.

[0063] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A device for synthesizing sodium-ion cathode material precursors, characterized in that, include: The main reactor has multiple feed pipes and an overflow port at the top. The main reactor is used to hold slurry. The secondary reactor has a feed inlet at the top connected to the overflow outlet, and the feed inlet is at a lower level than the overflow outlet. The concentrator is connected to the main reactor via the discharge port at the bottom of the secondary reactor. A seed tank is connected to the main reactor and is used to place small seed crystals with uniform particle size. The transfer tank is connected to the concentrator; Centrifuge, connected to the transfer tank.

2. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 1, characterized in that, The amount of the small seed crystals added accounts for 1% to 10% of the mass percentage of the slurry.

3. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 1, characterized in that, The overflow port is connected to the feed port of the secondary reactor via a pipeline.

4. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 3, characterized in that, The pipeline is arranged with a gradual downward slope from the end closest to the main reactor to the end furthest from the main reactor.

5. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 4, characterized in that, The tilt angle is set between 10° and 55°.

6. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 1, characterized in that, The sodium-ion cathode material precursor synthesis apparatus also includes multiple batching tanks, each of which is connected to the main reactor.

7. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 1, characterized in that, The number of multiple mixing tanks is three, namely a metal mixing tank, an ammonia tank, and a liquid alkali tank; the number of feed pipes is three, and the metal mixing tank, the ammonia tank, and the liquid alkali tank are connected to each feed pipe in a one-to-one correspondence.

8. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 1, characterized in that, The sodium-ion cathode material precursor synthesis apparatus further includes a feed pipe and a pump. The feed pipe is located at the bottom of the main reactor, which is connected to the secondary reactor via the feed pipe. The pump is located on the feed pipe.

9. The apparatus for synthesizing sodium-ion cathode material precursors according to claim 1, characterized in that, The sodium-ion cathode material precursor synthesis apparatus further includes a rotary kiln and a vibrating sieve, wherein the vibrating sieve is connected to the centrifuge via the rotary kiln.

10. A sodium-ion cathode material synthesis apparatus, characterized in that, The apparatus for synthesizing sodium-ion cathode material precursors according to any one of claims 1-9.

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