CN111908521A - Preparation method of narrow-distribution ternary cathode material precursor - Google Patents

Abstract

The invention relates to the technical field of lithium ion battery materials, and specifically provides a method for continuously producing a narrow-distributed ternary positive electrode material precursor. In the process of preparing the ternary precursor by the wet method, the precursor of the ternary cathode material with a controllable narrow distribution is obtained by separating the small particle materials; the narrow distribution ternary material with the core-shell structure is prepared continuously by using the surplus small particle material continuously. Precursor. The method not only reduces the difficulty of regulation in synthesizing narrow-distribution ternary precursors, but also greatly liberates the complicated regulation time. It also uses the small particle materials that would be wasted to prepare core-shell structure precursors, which realizes recycling, environmental protection and cost reduction. At the same time, the strategy of continuous utilization of small particle materials provides a broader direction for designing the internal structure of the ternary precursor, and the preparation conditions are simple, the cost is low, it is easy to industrialize, and the application prospect is broad.

Description

Preparation method of narrow distribution ternary cathode material precursor

technical field

The invention relates to the technical field of lithium ion battery materials, mainly to a ternary positive electrode material precursor, and in particular to a method for preparing a narrow distribution ternary positive electrode material precursor.

Background technique

With the increasing global demand for energy and the increasingly serious environmental pollution caused by the burning of fossil fuels, the development of clean energy technologies is imperative. Lithium-ion batteries have excellent characteristics such as high operating voltage, high energy density, long cycle life, low self-discharge rate, low pollution, and no memory effect, which have become a hot spot in the research and application of secondary batteries. Lithium-ion batteries have broad application prospects in new energy electric vehicles, digital products, mobile phones and other fields, but with the continuous development of the electric vehicle industry, people are concerned about the safety, charge-discharge specific capacity and cycle of energy products (lithium-ion batteries). Life expectancy puts forward higher and higher requirements. Therefore, the energy density of the electrode material has become an urgent issue to be considered at present, and the particle size distribution of the layered ternary cathode material is one of the important factors in determining the energy density of the electrode material. Inheritance, so the preparation of narrowly distributed ternary precursors has also received more and more attention. Although the layered nickel-rich ternary cathode material has the advantages of high charge-discharge specific capacity, lower price and less toxicity, it is considered as one of the most promising cathode materials, but this material has the first coulombic efficiency, low layer and so on. The problems such as Janh–Teller distortion of the structure-like structure make it suffer from defects such as rapid voltage and capacity decay during long cycling, poor rate performance, and low volume specific energy, which seriously hinder its practical application.

At present, there are two main strategies for the preparation of narrowly distributed ternary precursors: one is to control the preparation process, which mainly tests the control of crystal nucleus growth and various conditions; the other is to design unique equipment to artificially the separation of some large and small particles. Some patents have reports in this regard one after another. For example, the patent application with the application number CN201810527537.1 introduces the method of continuously using the precursor obtained in the previous reaction process as the crystal seed of the latter reaction process to prepare narrow distribution precursors. This kind of The method has higher requirements for the preparation of the seed crystal, and the process is longer, which prolongs the preparation time.

In addition, no matter which of the above methods for preparing narrow distribution precursors is used, there is a waste of small particles, which is a luxury in today's environment of excessive consumption of cobalt and nickel transition metal resources. Therefore, how to reduce the waste of raw materials while preparing satisfactory products is an urgent problem to be considered at present.

The current main trend is to develop new products through the export method of R&D guidance production line, but this kind of development cycle is long, and there is a lot of waste of R&D materials. It is a cost-effective research method to study products with better stable performance, and it can realize simultaneous production line and R&D, which greatly saves material and time costs.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a preparation method for continuous production of a ternary cathode material precursor with narrow particle size distribution, which can narrow the particle size distribution of the ternary precursor and avoid waste of small particle materials.

It should be noted that the narrow distribution in this application means that (D90-D10)/D50 is less than 1.

The technical scheme adopted by the present invention to solve its technical problems is as follows:

A method for continuously producing narrow-distributed ternary cathode material precursors, characterized in that, in the process of co-precipitating and synthesizing the precursors, the particle size of the reaction slurry is controlled, the large and small particles in the reaction slurry are separated, and the large and small particles obtained by the separation are separated. The granular material is used to prepare a narrow distribution precursor, and the separated small particle material is used to synthesize a narrow distribution core-shell structure precursor.

Specifically, a method for continuously producing narrow-distributed ternary cathode material precursors includes the following steps:

(1) Prepare mixed solution A and mixed solution B, sodium hydroxide solution and ammonia solution of soluble nickel, cobalt, manganese salt or soluble aluminum salt in different proportions;

(2) adding the ammonia solution and sodium hydroxide solution described in step (1) into the reactor I, stirring, and adjusting the ammonia concentration, pH value and temperature;

(3) Continue to add the mixed solution A, the ammonia solution and the sodium hydroxide solution in the step (1) into the reactor I, and adjust the ammonia concentration and pH value under stirring;

(4)) During the co-precipitation reaction of the reaction kettle I, the particle size of the reaction slurry is controlled, the large and small particles of the reaction slurry in the reaction kettle I are separated, and the small particles smaller than a certain particle size are discharged. Reflow, and after the solid content of the slurry reaches the requirement, the narrow-distributed ternary precursor is obtained;

(5) The small particle material separated in the step (4) is introduced into the reactor II, and the mixed solution B, the ammonia solution and the sodium hydroxide solution described in the step (1) are introduced into the reactor II at the same time. Adjust the ammonia concentration and pH value under agitation, control the particle size of the reaction slurry in the reactor II during the co-precipitation reaction, and discharge the small particles smaller than a certain particle size. Distributed core-shell structure ternary precursors.

Further, repeat the operation of step (5) for the small particle material obtained in any step, and adjust the molar ratio of metal ions in the mixed solution B according to the actual situation to prepare a variety of ternary precursors with narrow distribution core-shell structure. .

Further, it is characterized in that, in step (1), the total metal ion concentration of the mixed solution A and the mixed solution B is 1-5 mol/L, and the molar ratio of nickel to total metal ions in the mixed solution A is 0.7 -0.9, the molar ratio of nickel to total metal ions in mixed solution B is 0.5-0.7; the concentration of sodium hydroxide is 10-25 mol/L, and the mass fraction of ammonia is 28-30%.

Further, in step (1), the nickel-cobalt-manganese salt is one or more of sulfate, carbonate and nitrate, and the aluminum salt is aluminum nitrate, aluminum carbonate, aluminum sulfate and sodium metaaluminate solution one or more of.

Further, in step (2), the ammonia concentration is 5-12 g/L, the pH is 11-12, and the temperature is 40-80°C.

Further, in step (3), the ammonia concentration is adjusted to 5-12g/L, the pH is 11-12, the stirring speed is 200-800rpm, and the temperature is 40-80°C.

Further, in step (4), the median particle size of the particles of the reaction slurry is controlled to be 3-13um.

Further, in step (5), the median particle size of the reaction slurry is controlled to be 5-15um, the ammonia concentration is 5-8g/L, the pH is 11-12, the stirring speed is 200-800rpm, and the temperature is 40 -80°C.

Further, the prepared narrow-distribution ternary precursor and narrow-distribution core-shell structure ternary precursor are centrifugally washed, dried, sieved, and sealed for storage. The prepared precursor is washed with pure water at a temperature of 50-70 °C until the Na content is less than 150 ppm and the S content is less than 1000 ppm; the drying temperature is 120-150 °C, and a 100-400 mesh screen is used for sieving.

The principle of the present invention is as follows:

The measures of separating the large and small particles of the slurry are adopted, and the small particles are discharged to narrow the particle size distribution of the prepared precursors. purpose; in addition, the excess small particles can be used as seed crystals to synthesize ternary precursors for core-shell structures. Due to the different proportions of the prepared narrow-distribution ternary precursors, core-shell structures with different element distributions are obtained. This design makes the structure of the ternary precursors have more choices, and the ternary cathode materials that inherit this structure later have obvious advantages. structural advantage. The narrow distribution of precursor materials is beneficial to the improvement of the compaction density of the cathode material, thereby increasing the energy density of the material. The ternary precursor of the core-shell structure has high nickel inside, manganese outside, and high nickel inside, which is beneficial to increase the capacity of the cathode material and improve the stability of the material.

The present invention has the following beneficial effects:

1. The present invention prepares a narrowly distributed ternary precursor by controlling the size and particle size of the reaction slurry, and uses small particles not needed in the traditional process to synthesize a ternary precursor with a unique core-shell structure. The process is simple and avoids the need for raw materials. Waste, to achieve a very high economic value.

2. The ternary precursor of the core-shell structure realizes the layered arrangement inside the precursor through the strategy of adjusting the ratio of nickel, cobalt and manganese salts before and after; The conductivity is improved, the lithium ion channel is easier to intercalate Li ⁺ , and the diffusion rate of Li ⁺ is improved, thereby effectively improving the electrochemical performance of the ternary cathode material.

3. The difficulty of regulating and synthesizing ternary precursors with narrow distribution has been greatly reduced, and the ternary precursors of core-shell structure formed by taking measures to turn waste into treasure have laid the foundation for the industrialization of ternary cathode materials with multi-core-shell structure. . The unique multi-core shell structure effectively improves the structural stability and electrical conductivity of the ternary cathode material, and provides a stable lithium ion channel, which is beneficial to the deintercalation of lithium ions during the subsequent charging and discharging process, thereby improving its electrochemical performance.

4. The strategy of continuously using small particle materials to synthesize core-shell precursors provides a broader direction for designing the internal structure of ternary precursors.

Description of drawings

FIG. 1 is a SEM image of the Ni _0.8 Co _0.10 Mn _0.10 (OH) ₂ narrow distribution ternary cathode material precursor prepared in Example 1. FIG.

2 is a cross-sectional view of the (Ni _0.8 Co _0.10 Mn _0.10 ) _0.7 (Ni _0.5 Co _0.2 Mn _0.3 ) _0.3 (OH) ₂ core-shell ternary cathode material precursor prepared in Example 1. FIG.

3 is a cycle curve of the LiNi _0.8 Co _0.10 Mn _0.10 O ₂ and Li(Ni _0.8 Co _0.10 Mn _0.10 ) _0.7 (Ni _0.5 Co _0.2 Mn _0.3 ) _0.3 O ₂ positive electrode materials prepared in Example 1.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.

Example 1

This embodiment includes the following steps:

(1) Use nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and manganese sulfate monohydrate to prepare nickel, nickel, Cobalt and manganese mixed solution A and mixed solution B were prepared with a sodium hydroxide aqueous solution with a concentration of 10 mol/L, and an ammonia solution with a concentration of 12 mol/L.

(2) in 650L reactor I, pass 60 ℃ of pure water of 1/2 volume, be 400rpm at stirring speed, pass the ammonia solution of 10mol/L, be adjusted to concentration and be 6.5g/L, subsequently, pass hydrogen Sodium oxide solution, adjust pH to 12.

(3) In the 650L reaction kettle I, simultaneously feed mixed solution A, aqueous ammonia solution and sodium hydroxide solution, the ammonia concentration is maintained at 6-8g/L in the whole process, and the pH is maintained at 11.5-12.0.

(4) The particle size of the reaction slurry in the reactor I was tested in real time. After the median particle reached 8.5-10.0 μm, the small particles in the reactor I started to be separated. After the yield requirement is met, the narrowly distributed ternary precursor is obtained.

(5) The excess small particles discharged from the reaction kettle I were introduced into the reaction kettle II, and the mixed solution B, the ammonia solution and the sodium hydroxide solution were introduced at the same time, and the ammonia concentration and pH value were adjusted at a stirring speed of 800 rpm. The median particle size of the slurry is stabilized to 10.5-12.5μm, narrowing as in step (4),

(6) after the reaction kettle aging finishes, the reaction product in the reaction kettle Ⅰ and Ⅱ is washed with a centrifuge, and the control washing alkali and pure water temperature are 70 ℃, and the Na and S content of the finished product are respectively less than 150ppm and 800ppm, stop Washing; drying the washed solid particles at 140° C.; sieving through a 400-mesh sieve to obtain a narrow distribution ternary precursor and an associated core-shell structure ternary precursor, which can be sealed and stored.

The narrow distribution ternary precursor and the associated core-shell structure ternary precursor are respectively calcined to obtain the corresponding positive electrode material.

As shown in Figure 1, from the SEM image of the narrow distribution ternary precursor Ni _0.8 Co _0.10 Mn _0.10 (OH) ₂ prepared in this example, it can be seen that the precursor particles are spherical and uniform in size distribution.

As shown in FIG. 2 , from the cross-sectional view of the core-shell ternary precursor (Ni _0.8 Co _0.10 Mn _0.10 ) _0.7 (Ni _0.5 Co _0.2 Mn _0.3 ) _0.3 (OH) ₂ prepared in this example, it can be seen that the layer structure.

As shown in Figure 3, the cycle curves of the LiNi _0.8 Co _0.10 Mn _0.10 O ₂ , Li(Ni _0.8 Co _0.10 Mn _0.10 ) _0.7 (Ni _0.5 Co _0.2 Mn _0.3 ) _0.3 O ₂ positive electrode materials prepared in Example 1, It can be seen that the cathode material with core-shell structure has excellent cycle performance.

Example 2

This embodiment includes the following steps:

(1) Use nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and manganese sulfate monohydrate to prepare nickel, nickel, Cobalt and manganese mixed solution A and mixed solution B were prepared with a sodium hydroxide aqueous solution with a concentration of 10 mol/L, and an ammonia solution with a concentration of 12 mol/L.

(2) in 650L reactor I, pass into 1/3 volume of 60 ℃ pure water, be 400rpm at stirring speed, pass into the ammonia solution of 10mol/L, be adjusted to concentration and be 6.5g/L, subsequently, pass into hydrogen Sodium oxide solution, adjust pH to 12.

(3) Mixed solution A, aqueous ammonia solution and sodium hydroxide solution are simultaneously introduced into the reactor I, and the concentration of aqueous ammonia is maintained at 6-8g/L and the pH is maintained at 11.5-12.5 in the whole process.

(4) Test the particle size of the reaction slurry in the reactor I in real time. After the median particle reaches 8.5-13.0 μm, start to separate the small particles in the reactor I, and the small particles in the reflux part control the solid content of the slurry in the kettle. After the yield requirement is met, the narrowly distributed ternary precursor is obtained.

(5) The excess small particles discharged from the reaction kettle I were introduced into the reaction kettle II, and the mixed solution B, the ammonia solution and the sodium hydroxide solution were introduced at the same time, and the ammonia concentration and pH value were adjusted at a stirring speed of 800 rpm. The median particle size of the slurry was stabilized to 10.5-12.5 μm, and narrowed as in step (4).

(6) after the reaction kettle aging finishes, the reaction product in the reaction kettle is washed with a centrifuge, and the control washing with alkali and pure water temperature is 70 ℃, treat that the Na and S content of the finished product are respectively less than 150ppm and 800ppm, stop washing; The washed solid particulate material is dried; sieved through a 400-mesh sieve to obtain a narrow distribution ternary precursor and an associated core-shell structure ternary precursor, which can be sealed and stored.

Example 3

This embodiment includes the following steps:

(1) Use nickel nitrate hexahydrate, cobalt nitrate hexahydrate, and manganese nitrate tetrahydrate to prepare a nickel-cobalt-manganese soluble salt mixed solution A with a concentration of 2.0mol/L according to the molar ratio of Ni:Co:Mn of 0.90:0.04:0.06, Using nickel nitrate hexahydrate, cobalt nitrate hexahydrate, and aluminum sulfate hexahydrate according to the molar ratio of Ni:Co:Al of 0.55:0.15:0.30, the total concentration of nickel, cobalt, and aluminum mixed with a total concentration of 2.0mol/L was prepared. Solution B; prepare an aqueous sodium hydroxide solution with a concentration of 8 mol/L and an aqueous ammonia solution with a concentration of 12 mol/L.

(2) in 50L reactor I, pass into 60 ℃ pure water of 1/2 volume, be 800rpm at stirring speed, pass into the ammonia solution of 12mol/L, be adjusted to concentration and be 8.5g/L, subsequently, pass into hydrogen Sodium oxide solution, adjust pH to 11.8.

(3) Mixed solution A, aqueous ammonia solution and sodium hydroxide solution are simultaneously introduced into the reactor I, and the concentration of aqueous ammonia is maintained at 6-8g/L and the pH is maintained at 11.5-12.5 in the whole process.

(4) Test the particle size of the reaction slurry in the reactor I in real time. After the median particle reaches 8.5-13.0 μm, start to separate the small particles in the reactor I, and the small particles in the reflux part control the solid content of the slurry in the kettle. After the yield requirement is met, the narrowly distributed ternary precursor is obtained.

(5) The excess small particles discharged from the reaction kettle I were introduced into the reaction kettle II, and the mixed solution B, the ammonia solution and the sodium hydroxide solution were introduced at the same time, and the ammonia concentration and pH value were adjusted at a stirring speed of 800 rpm. The median particle size of the slurry was stabilized to 10.5-12.5 μm, and narrowed as in step (4).

(6) after the reaction kettle aging finishes, the reaction product in the reaction kettle is washed with a centrifuge, and it is 70 ℃ to control the amount of alkali used for washing and pure water temperature, treat that the Na and S content of the finished product are respectively less than 150ppm and 800ppm, stop washing; Dry the washed solid particulate material at 150° C.; sieve through a 400-mesh sieve to obtain a narrow distribution ternary precursor and an associated core-shell structure ternary precursor, which can be sealed and stored.

Example 4

This embodiment includes the following steps:

(1) Use nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and aluminum sulfate hexahydrate to prepare the total concentration of 2.0mol/L respectively according to the molar ratio of Ni:Co:Al 0:88:0.09:0.03 and 0.55:0.15:0.30 The nickel, cobalt, aluminum mixed solution A and mixed solution B were prepared; the sodium hydroxide aqueous solution with a concentration of 8 mol/L and the ammonia aqueous solution with a concentration of 12 mol/L were prepared.

(2) in the 30L reactor, feed 1/2 volume of 60 ℃ pure water, be 800rpm at stirring speed, feed the ammonia solution of 12mol/L, be adjusted to concentration and be 8.5g/L, subsequently, feed hydrogen peroxide Sodium solution, adjust pH to 11.8.

(3) Mixed solution A, ammonia solution and sodium hydroxide solution were simultaneously introduced into the 30L reactor I, and the ammonia concentration was maintained at 6-8g/L in the whole process, and the pH was maintained at 11.5-12.5.

(4) Test the particle size of the reaction slurry in the reactor I in real time. After the median particle reaches 8.5-13.0 μm, start to separate the small particles in the reactor I, and the small particles in the reflux part control the solid content of the slurry in the kettle. After the yield requirement is met, the narrowly distributed ternary precursor is obtained.

(5) The excess small particles discharged from the reaction kettle I were introduced into the reaction kettle II, and the mixed solution B, the ammonia solution and the sodium hydroxide solution were introduced at the same time, and the ammonia concentration and pH value were adjusted at a stirring speed of 800 rpm. The median particle size of the slurry was stabilized to 10.5-12.5 μm, and narrowed as in step (4).

(6) after the reaction kettle aging finishes, the reaction product in the reaction kettle is washed with a centrifuge, and it is 70 ℃ to control the amount of alkali used for washing and pure water temperature, treat that the Na and S content of the finished product are respectively less than 150ppm and 800ppm, stop washing; Dry the washed solid particulate material at 140° C.; sieve through a 400-mesh sieve to obtain a narrow distribution ternary precursor and an associated core-shell structure ternary precursor, which can be sealed and stored.

Example 5

This embodiment includes the following steps:

(1) Using nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and aluminum sulfate hexahydrate according to the molar ratios of Ni:Co:Al of 0.88:0.09:0.03, 0.65:0.15:0.30 and 0.55:0.15:0.30 to prepare total The nickel, cobalt, aluminum mixed solution A, mixed solution B and mixed solution C with a concentration of 2.0 mol/L were prepared; an aqueous solution of sodium hydroxide with a concentration of 8 mol/L and an aqueous ammonia solution with a concentration of 12 mol/L were prepared.

(2) in 30L reactor I, pass 1/2 volume of 60 ℃ pure water, be 800rpm at stirring speed, pass into the ammonia solution of 12mol/L, be adjusted to concentration and be 8.5g/L, subsequently, pass hydrogen Sodium oxide solution, adjust pH to 11.8.

(3) Into the 30L reactor I, simultaneously feed mixed solution A, aqueous ammonia solution and sodium hydroxide solution, the concentration of aqueous ammonia is maintained at 6-8 g/L and the pH is maintained at 11.5-12.5 in the whole process.

(4) Test the particle size of the reaction slurry in the reactor I in real time. After the median particle reaches 8.5-13.0 μm, start to separate the small particles in the reactor I, and the small particles in the reflux part control the solid content of the slurry in the kettle. After the yield requirement is met, the narrowly distributed ternary precursor is obtained.

(5) The small particles discharged from the reactor I were introduced into the reactor II, and the mixed solution B, the aqueous ammonia solution and the sodium hydroxide solution were simultaneously introduced, and the ammonia concentration and pH value were adjusted at a stirring speed of 800 rpm. The median particle size of the feed was stabilized to 10.5-12.5 μm, and narrowed as in step (4).

(6) The excess small particles discharged from the reactor II were introduced into the reactor III, and the mixed solution C, the ammonia solution and the sodium hydroxide solution were introduced at the same time, and the ammonia concentration and pH value were adjusted at a stirring speed of 800 rpm. Bit particle size stabilized to 10.5-12.5 μm, narrowing as in step (4).

(7) After the aging of the reactor, the reaction product in the reactor is washed with a centrifuge, and the amount of alkali used for washing and the temperature of pure water are controlled to be 70 ° C, and the Na and S content of the finished product are less than 150ppm and 800ppm respectively, and the washing is stopped; Dry the washed solid particulate material at 140° C.; sieve through a 400-mesh sieve to obtain a narrow distribution ternary precursor and an associated core-shell structure ternary precursor, which can be sealed and stored.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (8)

1. a method for continuous production of narrow distribution ternary positive electrode material precursor, is characterized in that, in the process of co-precipitation synthesis precursor, control the particle size of reaction slurry, separate the large and small particle material in the reaction slurry, separate and obtain The large particle material obtained is used to prepare the narrow distribution precursor, and the separated small particle material is used to synthesize the narrow distribution core-shell structure precursor. 2. a kind of method for continuous production of narrow distribution ternary positive electrode material precursor as claimed in claim 1, comprises the following steps: (1) Prepare mixed solution A and mixed solution B, sodium hydroxide solution and ammonia solution of soluble nickel, cobalt, manganese salt or soluble aluminum salt in different proportions; (2) adding the ammonia solution and sodium hydroxide solution described in step (1) into the reactor I, stirring, and adjusting the ammonia concentration, pH value and temperature; (3) Continue to add the mixed solution A, the ammonia solution and the sodium hydroxide solution in the step (1) into the reactor I, and adjust the ammonia concentration and pH value under stirring; (4) During the co-precipitation reaction of the reaction kettle I, the particle size of the reaction slurry is controlled, the large and small particles of the reaction slurry in the reaction kettle are separated, the small particles smaller than a certain particle size are discharged, and some small particles are refluxed. After the solid content of the slurry meets the requirements, the narrow distribution ternary precursor is obtained; (5) The small particle material separated in step (4) is introduced into the reaction kettle II, and the mixed solution B, the ammonia solution and the sodium hydroxide solution described in step (1) are introduced into the reaction kettle II at the same time. Adjust the ammonia concentration and pH value in the state, control the particle size of the reaction slurry in the reactor II during the co-precipitation reaction, and discharge the small particles smaller than a certain particle size. After the solid content of the slurry reaches the requirements, a narrow distribution is prepared Core-shell structure ternary precursor. 3 . The method for continuously producing narrow-distributed ternary positive electrode material precursors according to claim 2 , further comprising repeating the process of step (5) for the small particle materials obtained in any step, and 3 . According to the actual situation, the molar ratio of metal ions in mixed solution B was adjusted, and a variety of ternary precursors with narrow distribution core-shell structure were prepared. 4 . The method for continuously producing narrow-distribution ternary cathode material precursors according to claim 2 , wherein in step (1), the total metal ion concentration of the mixed solution A and the mixed solution B is 1. 5 . -5mol/L, the molar ratio of nickel to total metal ions in the mixed solution A is 0.7-0.9, the molar ratio of nickel to total metal ions in the mixed solution B is 0.5-0.7; the concentration of sodium hydroxide is 10-25mol/ L, the mass fraction of ammonia is 28-30%. 5 . The method for continuously producing narrow-distributed ternary positive electrode material precursors according to claim 2 , wherein in step (1), the nickel-cobalt-manganese salts are sulfates, carbonates, and nitrates. 6 . One or more of the aluminum salts are one or more of aluminum nitrate, aluminum carbonate, aluminum sulfate and sodium metaaluminate solution. 6 . The method for continuously producing narrow-distribution ternary positive electrode material precursors according to claim 2 , wherein in steps (2) and (3), the ammonia concentration is 5-12 g/L, 6 . The pH is 11-12 and the temperature is 40-80°C. 7 . The method for continuously producing narrow-distribution ternary cathode material precursors according to claim 2 , wherein in step (4), the median particle size of the particles of the reaction slurry is controlled to be 3-13um . 8 . The method for continuously producing narrow-distribution ternary positive electrode material precursors according to claim 2 , wherein in step (5), the ammonia concentration is 5-8 g/L, the pH is 11-12, and the stirring The speed is 200-800rpm, the temperature is 40-80°C, and the median particle size of the reaction slurry is controlled to be 5-15um.

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