A reactor for preparing ternary positive electrode material precursor and its application

Abstract

The present invention relates to the field of chemical equipment technology, and in particular to a reactor for preparing a ternary positive electrode material precursor and its application, comprising a main body, a double-layer hollow guide barrel installed inside the main body, a stirring mechanism installed on the top of the main body, a hollow baffle installed on the inner wall of the main body, the double-layer hollow guide barrel comprising an inner liner, a partition fixedly connected to the outer ring of the inner liner, a microporous filter membrane fixedly connected to the outer ring of the inner liner, a liquid outlet hole opened on the inner wall of the inner liner, a guide barrel mother liquor discharge pipe fixedly connected to the top of the inner liner, and a metal salt solution inlet pipe fixedly connected to the top of the inner liner. In the present invention, the microporous filter membrane originally used for external thickener filtration is directly installed on the inner liner, which can achieve the same or even larger filtration area, help to form a high-concentration slurry system, increase the solid content, and avoid the adverse effects of the external thickener on particle uniformity.

Description

Technical Field

[0001] The present invention relates to the field of chemical equipment, and in particular to a reaction kettle for preparing a ternary positive electrode material precursor and application thereof. Background Art

[0002] With the rapid development of electric vehicles, portable electronic devices and recyclable energy storage systems, the demand for high-performance lithium-ion batteries continues to increase. As a key material, ternary precursors have broad market prospects. The preparation process and technical level of ternary precursors are constantly improving. The emergence of new processes such as the oxalate method and liquid phase method has significantly improved product performance and met the needs of different application scenarios.

[0003] The mainstream synthesis method in the industry is the liquid phase co-precipitation method, and the reactor structure has a great influence on the liquid phase co-precipitation method. However, when the existing synthesis system is used for precursor synthesis reaction, the slurry vortex force is uneven, the particle growth is uneven, and it is very easy to cause more crystal nuclei to be generated and not uniformly reagglomerated, resulting in irregular particle formation, low sphericity, wide particle size distribution and other problems.

[0004] The ternary precursor synthesis system in the industry generally uses a reactor connected to an external concentrator. The external concentrator occupies a large area and has poor air tightness. There are some dead corners inside the concentrator, which causes some particles to be unable to return to the reactor in time for growth. The precursor particles in the concentrator are prone to differences with the particles in the reactor, and the particle consistency is not high. In order to increase production capacity, companies will increase the concentration of metal salt solutions or feed flow rates. This method affects the local supersaturation of the reaction system and also brings about the problem of poor consistency in particle growth.

[0005] It can be seen that how to design a reactor with ternary precursors for batteries as the research object, form a stable vortex in the reaction system, avoid the adverse effects of an external concentrator on particle uniformity, and achieve uniform particle growth, high sphericity and narrow particle size distribution has become an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0006] In view of this, the present invention provides a reactor for preparing a ternary positive electrode material precursor and its application. The main technical problem to be solved is: taking the ternary precursor as the research object, a stable vortex is formed in the reaction system, so that the metal salt solution feed has good dispersion, avoiding the adverse effects of the external concentrator on the uniformity of the particles, and achieving the purpose of uniform particle growth, high sphericity and narrow particle size distribution, which is conducive to large-scale promotion and application.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a reaction kettle for preparing a ternary positive electrode material precursor, comprising a main body, a double-layer hollow flow guide barrel is installed inside the main body, a stirring mechanism is installed on the top of the main body, a hollow baffle is installed on the inner wall of the main body, the main body comprises a kettle body, a kettle cover is installed on the top of the kettle body, the double-layer hollow flow guide barrel comprises an inner liner, the top of the inner liner is fixedly connected to the inner top of the kettle cover, the outer ring of the inner liner is fixedly connected to a partition, the outer ring of the inner liner is fixedly connected to a microporous filter membrane, and the microporous filter membrane is located at On the outside of the partition, the inner wall of the inner tank is provided with a liquid outlet, a first inner cavity is formed between the inner tank and the partition, a second inner cavity is formed between the partition and the microporous filtration membrane, a mother liquor discharge pipe of the diversion barrel is fixedly connected to the top of the inner tank, the bottom of the mother liquor discharge pipe of the diversion barrel is located inside the first inner cavity, and the top of the mother liquor discharge pipe of the diversion barrel extends to the top of the kettle cover, a metal salt solution inlet pipe is fixedly connected to the top of the inner tank, the bottom of the metal salt solution inlet pipe is located inside the second inner cavity, and the top of the metal salt solution inlet pipe extends to the top of the kettle cover.

[0008] By adopting the above technical solution, the microporous filtration membrane originally used for external thickener filtration is directly installed on the inner tank, which can achieve the same or even larger filtration area, help form a high-concentration slurry system, increase the solid content, and avoid the adverse effects of the external thickener on particle uniformity.

[0009] As a further description of the above technical solution:

[0010] The outer surface of the kettle body is fixedly connected with a precipitant liquid inlet pipeline, the precipitant liquid inlet pipeline is located on the left side of the kettle body, one end of the precipitant liquid inlet pipeline is located inside the kettle body, the outer surface of the kettle body is fixedly connected with a complexing agent liquid inlet pipeline, the complexing agent liquid inlet pipeline is located on the back side of the kettle body, and one end of the complexing agent liquid inlet pipeline is located inside the kettle body.

[0011] By adopting the above technical solution, it is convenient to add the complexing agent and the precipitating agent into the interior of the kettle during the reaction.

[0012] As a further description of the above technical solution:

[0013] The outer surface of the kettle cover is fixedly connected with a nitrogen inlet pipe, and the outer surface of the kettle cover is fixedly connected with a pure water inlet pipe, and the pure water inlet pipe is located above the nitrogen inlet pipe. There are multiple groups of nitrogen inlet pipes and pure water inlet pipes, and the nitrogen inlet pipes and the pure water inlet pipes are both inclined.

[0014] By adopting the above technical solution, nitrogen and pure water can be injected into the interior of the kettle, which can not only provide a reaction environment but also backflush and backwash the microporous filtration membrane.

[0015] As a further description of the above technical solution:

[0016] The stirring mechanism includes a motor, which is installed on the upper surface of the kettle cover. The output end of the motor is fixedly connected to a rotating shaft, which is located in the middle of the inner pot. The outer surface of the rotating shaft is fixedly connected to stirring blades, and the number of the stirring blades is multiple groups.

[0017] By adopting the above technical solution, the number of stirring blades is three layers, and the stirring blades are upward-pushing stirring blades. The motor can drive the rotating shaft to rotate and then drive the stirring blades to rotate, which can form a stable vortex in the reaction system, making it less likely for the material to adhere to the surface of the microporous filtration membrane, thereby improving the filtrate capacity.

[0018] As a further description of the above technical solution:

[0019] The number of the liquid outlet holes is multiple groups, and the positions of the liquid outlet holes correspond to the positions of the stirring blades.

[0020] By adopting the above technical solution, the stirring blades can violently push the particles to collide with each other, so that the dispersibility of the metal salt solution is maximized, thereby significantly improving the uniformity of particle growth and the uniformity of particle size distribution.

[0021] As a further description of the above technical solution:

[0022] The hollow baffle includes a baffle body, which is fixedly installed on the inner wall of the kettle body. There are multiple baffle bodies, and a third inner cavity is opened inside the baffle body. The side wall of the baffle body is fixedly connected with a baffle mother liquor discharge pipe, and the baffle mother liquor discharge pipe extends to the outside of the kettle body at one end away from the baffle body.

[0023] By adopting the above technical solution, the mother liquor can be extracted.

[0024] As a further description of the above technical solution:

[0025] The detection mechanism includes a control panel, a thermometer, and a pH meter. The control panel is installed on the outer surface of the kettle body, and the thermometer and the pH meter are installed on the inner surface of the kettle body. The thermometer and the pH meter are electrically connected to the control panel through wires.

[0026] By adopting the above technical solution, the temperature and pH value inside the kettle body can be detected, so as to facilitate timely adjustment of the reaction environment inside the kettle body.

[0027] An application of a reactor for preparing a ternary cathode material precursor, using the reactor prepared by the ternary cathode material precursor, comprises the following steps:

[0028] S1, mixing nickel salt, cobalt salt, manganese salt and deionized water to obtain a ternary metal salt solution;

[0029] S2, injecting a precipitant solution and a complexing agent solution into the kettle as a reaction base solution, and introducing a protective gas to fill the inner space of the kettle;

[0030] S3. The ternary metal salt solution, the precipitant solution and the complexing agent solution are simultaneously introduced into the kettle to form a mother liquor. Under the stirring action of the stirring mechanism, the reaction solution circulates inside and outside the double-layer hollow guide barrel to perform a co-precipitation reaction. The obtained mother liquor is discharged after being filtered through the liquid outlet hole on the inner tank and the microporous filter membrane installed on the outside of the baffle. After the reaction, the slurry is filtered, washed, dried and demagnetized to obtain a nickel-cobalt-manganese ternary precursor product.

[0031] By adopting the above technical solution and using a reactor to prepare the ternary precursor, the goals of uniform particle growth, high sphericity and narrow particle size distribution can be achieved.

[0032] By means of the above technical solution, the reactor for preparing ternary cathode material precursors and its application of the present invention have at least the following beneficial effects:

[0033] 1. Compared with the prior art, the reactor for preparing ternary cathode material precursors can directly install the microporous filter membrane originally used for external thickener filtration on the inner tank through the main body, double-layer hollow guide barrel and stirring mechanism, so as to achieve the same or even larger filtration area, help to form a high-concentration slurry system, increase the solid content, and avoid the adverse effects of the external thickener on the uniformity of particles.

[0034] 2. Compared with the prior art, the reactor used for the preparation of ternary positive electrode material precursors has a stirring mechanism. When in use, the stirring blades adopt an upward-pushing stirring blade and a multi-layer structure and are matched with a double-layer hollow guide barrel, which forms a stable vortex in the reaction system, making it less likely for the material to adhere to the surface of the microporous filtration membrane, thereby improving the filtrate capacity.

[0035] 3. Compared with the prior art, the reactor used for the preparation of ternary positive electrode material precursors has a double-layer hollow guide barrel and a stirring mechanism. The molten metal is evenly injected from the liquid outlet holes around the inner wall of the double-layer hollow guide barrel and faces the stirring blades. It can be evenly dispersed even in the case of high concentration or large flow rate feed, thereby achieving the purpose of uniform particle growth, high sphericity and narrow particle size distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of a reaction kettle for preparing a ternary positive electrode material precursor proposed by the present invention;

[0037] Figure 2 A cross-sectional view of the internal structure of a reactor for preparing a ternary cathode material precursor from a first perspective proposed by the present invention;

[0038] Figure 3 This is a side view of the overall structure of a reaction kettle for preparing a ternary positive electrode material precursor proposed by the present invention;

[0039] Figure 4 A cross-sectional view of the internal structure of a reactor for preparing a ternary cathode material precursor from a second viewing angle according to the present invention;

[0040] Figure 5 A reactor for preparing a ternary positive electrode material precursor proposed by the present invention Figure 4 A magnified view of the structure at center;

[0041] Figure 6 This is an electron microscope image of the ternary cathode material precursor particles prepared in the reactor of the present invention.

[0042] Legend:

[0043] 1. Main body; 101. Kettle body; 102. Precipitant liquid inlet pipeline; 103. Complexing agent liquid inlet pipeline; 104. Kettle cover; 105. Nitrogen inlet pipe; 106. Pure water inlet pipe; 2. Double-layer hollow guide barrel; 201. Inner tank; 202. Partition plate; 203. Microporous filter membrane; 204. Liquid outlet hole; 205. First inner cavity; 206. Second inner cavity; 207. Guide barrel mother liquor discharge pipeline; 208. Metal salt solution liquid inlet pipeline; 3. Stirring mechanism; 301. Motor; 302. Rotating shaft; 303. Stirring blade; 4. Hollow baffle; 401. Baffle body; 402. Third inner cavity; 403. Baffle mother liquor discharge pipe; 5. Detection mechanism; 501. Control panel; 502. Thermometer; 503. pH meter. DETAILED DESCRIPTION

[0044] Reference Figure 1-6The present invention provides a reactor for preparing a ternary cathode material precursor: comprising a main body 1, a double-layer hollow guide barrel 2 is installed inside the main body 1, wherein the height ratio of the double-layer hollow guide barrel 2 to the height of the main body 1 is 0.75:1, and the height ratio of the double-layer hollow guide barrel 2 to the inner diameter of the main body 1 is 0.55:1. The microporous filter membrane originally used for filtering by an external thickener is installed inside the main body 1, which can achieve the same or even larger filtering area, help to form a high-concentration slurry system, increase the solid content, and avoid the adverse effects of the external thickener on the uniformity of particles. A stirring mechanism 3 is installed on the top of the main body 1 to stir the mother liquor of the reaction. A medium The baffle plate 4, the main body 1 includes a kettle body 101. When in use, a heating component can be arranged at the bottom of the kettle body 101, such as a heating base containing an electric heating wire inside, to heat the kettle body 101. A kettle cover 104 is installed on the top of the kettle body 101. A buckle (not shown) for connection and sealing is arranged between the kettle body 101 and the kettle cover 104. The double-layer hollow guide barrel 2 includes an inner liner 201. The top of the inner liner 201 is fixedly connected to the inner top of the kettle cover 104. The inner liner 201 is connected to the inner top of the kettle cover 104 through a connecting column, so that the inner liner 201 can be suspended and installed inside the kettle body 101, so that the double-layer hollow guide barrel 2 can be immersed in the slurry when in use, and the outer surface of the inner liner 201 is fixedly connected to the inner top of the kettle cover 104. The inner ring of the inner tank 201 is fixedly connected with a partition 202, the outer ring of the inner tank 201 is fixedly connected with a microporous filter membrane 203, and the microporous filter membrane 203 is located on the outside of the partition 202, and the microporous filter membrane 203 can filter the mother liquor, and the inner wall of the inner tank 201 is provided with a liquid outlet 204, a first inner cavity 205 is formed between the inner tank 201 and the partition 202, and a second inner cavity 206 is formed between the partition 202 and the microporous filter membrane 203, and the top of the inner tank 201 is fixedly connected with a guide barrel mother liquor discharge pipe 207, the bottom of the guide barrel mother liquor discharge pipe 207 is located inside the first inner cavity 205, and the top of the guide barrel mother liquor discharge pipe 207 extends to the top of the kettle cover 104, and the guide barrel mother liquor discharge pipe The channel 207 can extract and discharge the mother liquor in the first inner cavity 205. The top of the inner tank 201 is fixedly connected with a metal salt solution inlet pipe 208. The bottom of the metal salt solution inlet pipe 208 is located inside the second inner cavity 206, and the top of the metal salt solution inlet pipe 208 extends to the top of the kettle cover 104. The ternary metal salt solution is injected into the kettle body 101 through the metal salt solution inlet pipe 208. The microporous filter membrane 203 originally used for external thickener filtration is directly installed on the inner tank 201, which can achieve the same or even larger filtration area, help to form a high-concentration slurry system, increase the solid content, and avoid the adverse effects of the external thickener on particle uniformity.

[0045] The outer surface of the kettle body 101 is fixedly connected with a precipitant liquid inlet pipe 102, which is located on the left side of the kettle body 101, and one end of the precipitant liquid inlet pipe 102 is located inside the kettle body 101, so as to facilitate adding the precipitant into the kettle body 101. The outer surface of the kettle body 101 is fixedly connected with a complexing agent liquid inlet pipe 103, which is located on the back of the kettle body 101, and one end of the complexing agent liquid inlet pipe 103 is located inside the kettle body 101, so as to facilitate adding the complexing agent into the kettle body 101. The kettle cover 10 4 is fixedly connected with a nitrogen inlet pipe 105, and the outer surface of the kettle cover 104 is fixedly connected with a pure water inlet pipe 106, which is located above the nitrogen inlet pipe 105. There are multiple groups of nitrogen inlet pipes 105 and pure water inlet pipes 106, and the nitrogen inlet pipes 105 and the pure water inlet pipes 106 are all inclinedly arranged. Nitrogen and pure water can be injected into the interior of the kettle body 101 through the nitrogen inlet pipes 105 and the pure water inlet pipes 106, which can not only provide a reaction environment but also backflush and backwash the microporous filtration membrane 203.

[0046] The stirring mechanism 3 includes a motor 301, which is mounted on the upper surface of the kettle cover 104. The output end of the motor 301 is fixedly connected to a rotating shaft 302, which is located in the middle of the inner tank 201. The outer surface of the rotating shaft 302 is fixedly connected to a stirring blade 303. The deflection angle of the stirring blade 303 is 15°-45°. The number of the stirring blades 303 is multiple groups. The operation of the motor 301 can drive the rotating shaft 302 to rotate and then drive the stirring blades 303 to rotate, which can form a stable vortex in the reaction system, making it less likely for the material to adhere to the surface of the microporous filter membrane 203, and can improve the filtrate capacity. The number of the liquid outlet holes 204 is multiple groups, and the position of the liquid outlet holes 204 corresponds to the position of the stirring blades 303, so that the stirring blades 303 can violently promote the collision between the particles, so that the dispersibility of the metal salt solution is maximized, thereby significantly improving the uniformity of particle growth and the uniformity of particle size distribution.

[0047] The hollow baffle 4 includes a baffle body 401, which is fixedly installed on the inner wall of the kettle body 101. There are multiple baffle bodies 401, and a third inner cavity 402 is opened inside the baffle body 401. The side wall of the baffle body 401 is fixedly connected with a baffle mother liquor discharge pipe 403. The baffle mother liquor discharge pipe 403 extends from one end of the baffle body 401 to the outside of the kettle body 101, so as to extract the mother liquor.

[0048] The detection mechanism 5 includes a control panel 501, a thermometer 502, and a pH meter 503. The control panel 501 is installed on the outer surface of the kettle body 101, and the thermometer 502 and the pH meter 503 are both installed on the inner surface of the kettle body 101. The thermometer 502 and the pH meter 503 are electrically connected to the control panel 501 through wires. The thermometer 502 can be an E52 series temperature sensor or other instrument capable of detecting temperature. The pH meter 503 can be DALCK's M600 enamel reactor pH meter or other instrument capable of detecting pH value. A display and control buttons are provided on the control panel 501, which can display the data detected by the thermometer 502 and the pH meter 503, and can detect the temperature and pH value inside the kettle body 101, so as to facilitate timely adjustment of the reaction environment inside the kettle body 101.

[0049] An application of a reactor for preparing a ternary cathode material precursor, using the reactor prepared by the ternary cathode material precursor, comprises the following steps:

[0050] S1. Mix nickel salt, cobalt salt, manganese salt and deionized water to obtain a ternary metal salt solution, wherein the nickel salt, cobalt salt and manganese salt are any one of sulfate, nitrate or chloride salts of the corresponding metal ions or a combination of at least two thereof, and typical but non-limiting combinations include a combination of sulfate and nitrate, a combination of nitrate and chloride, a combination of sulfate and chloride, or a combination of sulfate, nitrate and chloride, and the total concentration of metal ions in the ternary metal salt solution is 2-3 mol / L. Specifically, nickel sulfate, cobalt sulfate, manganese sulfate and deionized water are mixed to obtain a ternary metal salt solution with a total metal ion concentration of 2.5 mol / L, and the molar ratio of Ni, Co and Mn in the ternary metal salt solution is 90:9:1;

[0051] S2, injecting a precipitant solution and a complexing agent solution into the kettle body 101 as a reaction bottom liquid, and introducing a protective gas to fill the inner space of the kettle body 101, wherein the precipitant solution is sodium hydroxide, the complexing agent is ammonia water, the pH of the reaction bottom liquid during the reaction is 10-12, and the protective gas is nitrogen. Specifically, sodium hydroxide solution and ammonia water are introduced into the kettle body 101 of the reactor as the reaction bottom liquid, the pH of the reaction bottom liquid is controlled to be 10.4, the ammonia concentration is 8g / L, the bottom liquid temperature is 60°C, and nitrogen is introduced as a protective gas to fill the space of the kettle body 101;

[0052] S3, the ternary metal salt solution, the precipitant solution and the complexing agent solution are simultaneously introduced into the kettle to form a mother liquor. Under the stirring action of the stirring mechanism 3, the reaction solution circulates inside and outside the double-layer hollow guide barrel 2 to perform a co-precipitation reaction. The obtained mother liquor is discharged after being filtered through the liquid outlet 204 on the inner tank 201 and the microporous filter membrane 203 installed on the outer side of the baffle 202. After the reaction, the slurry is filtered, washed, dried and demagnetized to obtain a nickel-cobalt-manganese ternary precursor product. The stirring rate of the stirring blade 303 is 100-350rpm, the temperature of the co-precipitation reaction is 40-80°C, and the specific The ternary metal salt solution, sodium hydroxide solution and ammonia water flow into the kettle body 101 in parallel, wherein the ternary metal salt solution is injected into the inner layer of the double-layer hollow guide barrel 2 through the liquid inlet pipe, and is evenly dispersed at the liquid outlet 204. Under the stirring action of the stirring blade 303 at a rate of 250 rpm, the reaction solution circulates inside and outside the double-layer hollow guide barrel 2 to perform a co-precipitation reaction, and the mother liquor is discharged into the second inner cavity 206 through the inner liner 201 of the double-layer hollow guide barrel 2 and the microporous filter membrane 203. Then the obtained nickel-cobalt-manganese ternary precursor is subjected to filter pressing, washing, drying and demagnetization in turn to obtain precursor particles with high sphericity and narrow particle size distribution.

[0053] The use of a reactor to prepare the ternary precursor can achieve the goals of uniform particle growth, high sphericity and narrow particle size distribution.

[0054] Working principle: The microporous filter membrane 203 originally used for external thickener filtration is directly installed on the inner tank 201, which can achieve the same or even larger filtration area, help to form a high-concentration slurry system, increase the solid content, and avoid the adverse effects of the external thickener on particle uniformity. The stirring blade 303 adopts an upward-pushing stirring blade 303 and a multi-layer structure with a double-layer hollow guide barrel 2, which forms a stable vortex in the reaction system, making it more difficult for the material to adhere to the surface of the microporous filter membrane 203, which can improve the filtrate capacity. The metal liquid is evenly injected from the liquid outlet holes 204 around the inner wall of the double-layer hollow guide barrel 2 and faces the stirring blade 303. It can be evenly dispersed even in the case of high concentration or large flow rate feed, achieving the purpose of uniform particle growth, high sphericity and narrow particle size distribution.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reactor for preparing a ternary cathode material precursor, comprising a main body (1), characterized in that: A double-layer hollow flow guide barrel (2) is installed inside the main body (1), a stirring mechanism (3) is installed on the top of the main body (1), a hollow baffle (4) is installed on the inner wall of the main body (1), the main body (1) comprises a kettle body (101), a kettle cover (104) is installed on the top of the kettle body (101), the double-layer hollow flow guide barrel (2) comprises an inner liner (201), the top of the inner liner (201) is fixedly connected to the inner top of the kettle cover (104), the outer ring of the inner liner (201) is fixedly connected to a partition (202), the outer ring of the inner liner (201) is fixedly connected to a microporous filter membrane (203), and the microporous filter membrane (203) is located on the outer side of the partition (202), and the inner wall of the inner liner (201) is provided with a liquid outlet hole (204). A first inner cavity (205) is formed between the inner liner (201) and the partition (202), and a second inner cavity (206) is formed between the partition (202) and the microporous filtration membrane (203). The top of the inner liner (201) is fixedly connected to a guide barrel mother liquor discharge pipe (207), the bottom of the guide barrel mother liquor discharge pipe (207) is located inside the first inner cavity (205), and the top of the guide barrel mother liquor discharge pipe (207) extends to the top of the kettle cover (104). The top of the inner liner (201) is fixedly connected to a metal salt solution inlet pipe (208), the bottom of the metal salt solution inlet pipe (208) is located inside the second inner cavity (206), and the top of the metal salt solution inlet pipe (208) extends to the top of the kettle cover (104).

2. The reactor for preparing a ternary cathode material precursor according to claim 1, characterized in that: The outer surface of the kettle body (101) is fixedly connected to a precipitant liquid inlet pipeline (102), the precipitant liquid inlet pipeline (102) is located on the left side of the kettle body (101), and one end of the precipitant liquid inlet pipeline (102) is located inside the kettle body (101); the outer surface of the kettle body (101) is fixedly connected to a complexing agent liquid inlet pipeline (103), the complexing agent liquid inlet pipeline (103) is located on the back side of the kettle body (101), and one end of the complexing agent liquid inlet pipeline (103) is located inside the kettle body (101).

3. A reactor for preparing a ternary cathode material precursor according to claim 2, characterized in that: The outer surface of the kettle cover (104) is fixedly connected with a nitrogen inlet pipe (105), and the outer surface of the kettle cover (104) is fixedly connected with a pure water inlet pipe (106), and the pure water inlet pipe (106) is located above the nitrogen inlet pipe (105). There are multiple groups of the nitrogen inlet pipe (105) and the pure water inlet pipe (106), and the nitrogen inlet pipe (105) and the pure water inlet pipe (106) are both inclined.

4. A reactor for preparing a ternary cathode material precursor according to claim 3, characterized in that: The stirring mechanism (3) comprises a motor (301), the motor (301) being mounted on the upper surface of the kettle cover (104), the output end of the motor (301) being fixedly connected to a rotating shaft (302), the rotating shaft (302) being located in the middle of the inner pot (201), the outer surface of the rotating shaft (302) being fixedly connected to stirring blades (303), and the number of the stirring blades (303) being multiple groups.

5. The reactor for preparing a ternary cathode material precursor according to claim 4, characterized in that: The number of the liquid outlet holes (204) is multiple groups, and the positions of the liquid outlet holes (204) correspond to the positions of the stirring blades (303).

6. The reactor for preparing a ternary cathode material precursor according to claim 5, characterized in that: The hollow baffle (4) comprises a baffle body (401), wherein the baffle body (401) is fixedly mounted on the inner wall of the kettle body (101), the number of the baffle bodies (401) is multiple, a third inner cavity (402) is provided inside the baffle body (401), a baffle mother liquor discharge pipe (403) is fixedly connected to the side wall of the baffle body (401), and the baffle mother liquor discharge pipe (403) extends from one end of the baffle body (401) away from the baffle body (401) to the outside of the kettle body (101).

7. The reactor for preparing a ternary cathode material precursor according to claim 6, characterized in that: The detection mechanism (5) comprises a control panel (501), a thermometer (502), and a pH meter (503); the control panel (501) is mounted on the outer surface of the kettle body (101); the thermometer (502) and the pH meter (503) are both mounted on the inner surface of the kettle body (101); and the thermometer (502) and the pH meter (503) are electrically connected to the control panel (501) via a wire.

8. An application of a reactor for preparing a ternary cathode material precursor, using the reactor for preparing a ternary cathode material precursor according to claims 1-7, characterized in that: The following steps are involved: S1, mixing nickel salt, cobalt salt, manganese salt and deionized water to obtain a ternary metal salt solution; S2, injecting a precipitant solution and a complexing agent solution into the kettle (101) as a reaction base solution, and introducing a protective gas to fill the inner space of the kettle (101); S3. The ternary metal salt solution, the precipitant solution and the complexing agent solution are introduced into the kettle body in parallel to form a mother liquor. Under the stirring action of the stirring mechanism (3), the reaction solution circulates inside and outside the double-layer hollow guide barrel (2) to perform a co-precipitation reaction. The obtained mother liquor is discharged after being filtered through the liquid outlet (204) on the inner tank (201) and the microporous filter membrane (203) installed on the outside of the baffle (202). After the reaction is completed, the slurry is filtered, washed with water, dried, and demagnetized to obtain a nickel-cobalt-manganese ternary precursor product.

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