CN115385399A - Nickel-cobalt-manganese ternary precursor and intermittent preparation process thereof - Google Patents
Nickel-cobalt-manganese ternary precursor and intermittent preparation process thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of lithium ion battery materials, and discloses a nickel-cobalt-manganese ternary precursor and an intermittent preparation method thereof. In the nucleation stage, a crystal nucleus with better dispersity and sphericity is obtained by controlling the pH value and the alkalinity; and after the nucleation stage is finished, the growth stage is carried out, and the precursor material with good sphericity and high compaction density is obtained through accurate material distribution and flow control. The prepared precursor secondary particles are spherical, the primary particles are laminated, and the thickness of the laminated sheets is 50 to 400nm; the grain diameter D50 is 2.0 to 4.0 mu m, and the tap density is 2.0 to 2.3g/cm 3 The specific surface area is 5 to 15m 2 (ii) in terms of/g. The invention realizes the target nickel-cobalt-manganese precursor by means of conventional process parameter adjustment, material distribution and the likeThe preparation method has the advantages of simple process, strong operability and no additional cost.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a nickel-cobalt-manganese ternary precursor and a preparation method thereof.
Background
In the field of hydroxide ternary precursor materials, compared with precursors produced by a continuous process, the precursors produced by an intermittent process have the advantages of good particle consistency, strong index adjustability and the like, and can meet the more severe application scene. The intermittent ternary precursor is usually used by matching two products with large and small particle sizes, and the processes adopted by the two products with the particle sizes have great difference and need to be separately prepared.
The intermittent large-particle-size ternary precursor has a large proportion in practical application, determines most properties of corresponding anode materials, and is widely and deeply researched for preparation. And the research on the preparation of the batch type small-particle-size precursor is relatively less. Although the small-particle-size precursor is matched with the large-particle-size precursor in a relatively low proportion, the small-particle-size precursor still has a great influence on the overall performance of the large-particle-size precursor, for example, the particle size distribution of the small-particle-size precursor determines the micro-powder condition of the cathode material to a great extent, and directly influences the capacity exertion of the cathode material.
At present, the research on intermittent small-particle-size precursors in the industry mainly focuses on the controllable preparation and parameter adjustment of medium-and small-particle-size precursors, and the research on the controllable preparation of precursors with D50 in a smaller particle size range of 2 to 4 mu m is less. The patent document with the publication number of CN107834064B discloses a high-nickel small-particle-size nickel-cobalt-manganese hydroxide and a preparation method thereof, the method prepares a small-particle-size ternary precursor by concentrating slurry with a large number of small particles outside a kettle and then growing the concentrated slurry, and the method does not relate to the content of regulating the shape of the precursor and the like. Patent document with publication No. CN112086616B discloses a preparation method of a large (010) crystal face nickel cobalt manganese or nickel cobalt manganese aluminum layered positive electrode material, which comprises first synthesizing a large (010) area sheet crystal nucleus, and then synthesizing a large (010) area medium-large particle size precursor, wherein the method performs (010) plane regulation and control on the medium-large particle size, and the primary particle size of the precursor is about 3 μm, which is not suitable for precursor products with particle sizes of 2 to 4 μm.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a small-particle-size nickel-cobalt-manganese ternary precursor with good sphericity, high tap density and high specific surface area and a preparation method thereof.
In order to achieve the above object, the present invention provides the following specific technical solutions.
Firstly, the invention provides a nickel-cobalt-manganese ternary precursor with a chemical molecular formula of Ni x Co y Mn 1-x-y (OH) 2 Wherein x is more than or equal to 0.70 and less than 1.0, and y is more than 0 and less than 0.3; the precursor secondary particles are spherical, the primary particles are laminated, and the thickness of the laminated sheet is 50 to 400nm; the particle size D50 of the precursor is 2.0-4.0 mu m, and the tap density is 2.0-2.3g/cm 3 The specific surface area is 5 to 15m 2 /g。
Secondly, the invention provides an intermittent preparation method of the nickel-cobalt-manganese ternary precursor, which comprises the following steps:
(1) Preparing a nickel-cobalt-manganese mixed salt solution, a precipitator solution and a complexing agent solution;
(2) Preparing a reaction kettle bottom solution;
(3) Adding the nickel-cobalt-manganese mixed salt solution prepared in the step (1), a precipitator solution and a complexing agent solution into the bottom solution of the reaction kettle in a parallel flow manner, and controlling the adding speed of the nickel-cobalt-manganese mixed salt solution to be V 1 Adjusting the pH value of a system in the reaction kettle to be 11.0-13.0 and the alkalinity to be 20-40g/L; stopping the reaction when the reaction slurry reaches the target granularity D1 to obtain crystal nucleus slurry;
(4) Evenly conveying the crystal nucleus slurry to N growth kettles, wherein N is a natural number and is more than or equal to 2 and less than or equal to 10; adding the nickel-cobalt-manganese mixed salt solution, the precipitator solution and the complexing agent solution prepared in the step (1) into each growth kettle in a parallel flow manner; adjusting the pH value of the reaction system to 10.0-12.0 and the alkalinity to 15-30g/L;
when the value of N is 2The speed of adding the nickel-cobalt-manganese mixed salt solution into each growth kettle is V 2 ；
When N is a natural number and is more than or equal to 3 and less than or equal to 10, the speed of adding the nickel-cobalt-manganese mixed salt solution into each growth kettle is 2V 2 /N；
(5) And (5) stopping the reaction when the granularity of the reaction slurry in the step (4) reaches the target granularity D2, and obtaining the nickel-cobalt-manganese ternary precursor after the reaction slurry is subjected to aging, solid-liquid separation, washing and solid phase drying.
Further, in some preferred embodiments of the present invention, the salt of nickel, cobalt, and manganese of the nickel-cobalt-manganese mixed salt solution is at least one of sulfate, nitrate, and chloride.
Further, the total concentration of metal ions in the nickel-cobalt-manganese mixed salt solution is 1.0 to 2.5mol/L.
Further, in some preferred embodiments of the present invention, the precipitant is sodium hydroxide, and the precipitant solution has a concentration of 5 to 10mol/L; the complexing agent is ammonia water, and the concentration of the complexing agent solution is 6 to 12mol/L.
Further, in a part of preferable embodiments of the invention, the pH value of the reaction kettle bottom liquid is 11.0 to 13.0, and the alkalinity is 20 to 40g/L.
Further, in some preferred embodiments of the present invention, the target particle size D1 is D50=1.0 to 3.0 μm; the target granularity D2 is D50=2.0 to 4.0 μm.
Further, in some preferred embodiments of the present invention, the temperature of the reaction system in the step (3) is controlled to be 50 to 80 ℃ and the stirring speed is 500 to 800rpm.
Further, in a partially preferred embodiment of the present invention, the temperature of the reaction system in the step (4) is controlled to be 50 to 80 ℃ and the stirring speed is 400 to 700rpm.
Further, in some preferred embodiments of the present invention, during the reaction of step (3) and step (4), the concentration is performed by a thickener.
Further, when the reaction in the step (4) is finished, the solid content of the reaction system is 400-800g/L.
The invention prepares the precursor material by an intermittent process, and obtains crystal nucleus with better dispersity and sphericity degree by controlling the pH value and alkalinity in the nucleation stage; and after the nucleation stage is finished, the growth stage is carried out, and the precursor material with good sphericity and high compaction density is obtained through accurate material distribution and flow control.
Compared with the prior art, the invention has the following obvious beneficial effects:
(1) The invention provides a process for intermittently preparing a nickel-cobalt-manganese ternary precursor with extremely small particle size, which realizes the regulation and control of primary particles and secondary particles of the nickel-cobalt-manganese ternary precursor with extremely small particle size;
(2) The preparation method realizes the preparation of the target nickel-cobalt-manganese precursor by means of conventional process parameter adjustment, material distribution and the like, and has the advantages of simple process, strong operability and no additional cost;
(3) The precursor material prepared by the invention has small granularity, high tap density and large specific surface area, is a small-granularity ternary precursor with excellent performance, and has wide application prospect in the aspects of single crystal materials, high-compaction materials and high-power materials.
Drawings
FIG. 1 is a 10000 times scanning electron microscope image of the Ni-Co-Mn ternary precursor prepared in example 1;
FIG. 2 is a 10000 times scanning electron microscope image of the Ni-Co-Mn ternary precursor prepared in example 2;
FIG. 3 is a 10000 times scanning electron micrograph of the nickel cobalt manganese ternary precursor prepared in example 3;
FIG. 4 is a 10000 times scanning electron microscope image of the Ni-Co-Mn ternary precursor prepared in example 4;
fig. 5 is a 10000-fold scanning electron micrograph of the nickel-cobalt-manganese ternary precursor prepared in comparative example 1.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The invention firstly provides a nickel-cobalt-manganese ternary precursor with a chemical molecular formula of Ni x Co y Mn 1-x-y (OH) 2 Wherein x is more than or equal to 0.70 and less than 1.0, y is more than 0 and less than 0.3; the precursor secondary particles are spherical, the primary particles are laminated, and the thickness of the laminated sheet is 50 to 400nm; the particle size D50 of the precursor is 2.0-4.0 mu m, and the tap density is 2.0-2.3g/cm 3 The specific surface area is 5 to 15m 2 /g。
Researches find that the primary particle thickness of the nickel-cobalt-manganese ternary precursor is closely related to the area of a crystal face (010), and the adjustment of the crystal face (010) in a certain range can be realized by adjusting the primary particle thickness of the precursor.
The precursor material provided by the invention gives consideration to main index parameters such as (010) crystal face, tap density, specific surface area and the like, is a small-particle-size ternary precursor with excellent performance, and has wide application prospects in the aspects of single crystal materials, high-compaction materials and high-power materials.
The invention also provides an intermittent preparation method of the nickel-cobalt-manganese ternary precursor, which comprises the following steps:
(1) Preparing a nickel-cobalt-manganese mixed salt solution, a precipitator solution and a complexing agent solution;
(2) Preparing a reaction kettle bottom solution;
(3) Adding the nickel-cobalt-manganese mixed salt solution prepared in the step (1), a precipitator solution and a complexing agent solution into the bottom solution of the reaction kettle in a parallel flow manner, and controlling the adding speed of the nickel-cobalt-manganese mixed salt solution to be V 1 Adjusting the pH value of a system in the reaction kettle to be 11.0-13.0 and the alkalinity to be 20-40g/L; stopping the reaction when the reaction slurry reaches the target granularity D1 to obtain crystal nucleus slurry;
(4) Evenly conveying the crystal nucleus slurry to N growth kettles, wherein N is a natural number and is more than or equal to 2 and less than or equal to 10; adding the nickel-cobalt-manganese mixed salt solution, the precipitator solution and the complexing agent solution prepared in the step (1) into each growth kettle in a parallel flow manner; adjusting the pH value of a reaction system to be 10.0 to 12.0 and the alkalinity to be 15 to 30g/L;
when the N value is 2, the speed of adding the nickel-cobalt-manganese mixed salt solution into each growth kettle is V 2 ；
When N is a natural number and is more than or equal to 3 and less than or equal to 10, the speed of adding the nickel-cobalt-manganese mixed salt solution into each growth kettle is 2V 2 /N；
(5) And (5) stopping the reaction when the granularity of the reaction slurry in the step (4) reaches the target granularity D2, and obtaining the nickel-cobalt-manganese ternary precursor after the reaction slurry is subjected to aging, solid-liquid separation, washing and solid phase drying.
The crystal nucleus slurry is evenly distributed into the growth reaction kettles, and the flow of the nickel-cobalt-manganese mixed salt solution is adjusted according to the number of the distributed reaction kettles. The adding speed of the nickel-cobalt-manganese mixed salt solution in the nucleation stage is V 1 The different number of the growth reaction kettles directly relates to the adding speed of the nickel-cobalt-manganese mixed salt solution of each growth reaction kettle. When the number of the growth reaction kettles is 2, the adding speeds of the nickel-cobalt-manganese mixed salt solution of the 2 growth reaction kettles in the growth stage are respectively V 2 As the number of the growth reaction kettles increases, the addition speed of the nickel-cobalt-manganese mixed salt solution of each growth reaction kettle is reduced, such as: if the number of the reaction kettles in the growth stage is 5, the flow speed of the nickel-cobalt-manganese mixed salt solution of each growth reaction kettle is 2V 2 (iii)/5; if the number of the growth reaction kettles is 8, the flow speed of the nickel-cobalt-manganese mixed salt solution of each growth reaction kettle is 2V 2 /8. In general, as the number of the growth reaction kettles increases, the addition speed of the nickel-cobalt-manganese mixed salt solution of each growth reaction kettle decreases.
After the crystal nucleus slurry is evenly distributed to the growth reaction kettle, the flow of the nickel-cobalt-manganese mixed metal salt is adjusted according to the number of the sub-kettles, and the obtained particle sizes of the crystal seeds with different quantities are consistent after the same growth period is ensured; obtaining laminated primary particles, wherein the thickness of the laminated precursor ranges from 50 to 400nm, and the number of the growth reaction kettles is more than 2 and less than 10. Along with the increase of the number of the growth reaction kettles, the amount of the crystal seeds in each growth kettle is small, and in order to ensure that the growth period is consistent with the particle size, the growth of the particles is slow, the primary particles are thicker, and the tap density is reduced.
In some embodiments, the salt of nickel, cobalt, and manganese that is formulated into the nickel-cobalt-manganese mixed salt solution is at least one of sulfate, nitrate, and chloride. The total concentration of metal ions in the nickel-cobalt-manganese mixed salt solution is 1.0 to 2.5mol/L, and preferably 1.5 to 2.5mol/L.
In some specific embodiments, sodium hydroxide is selected as a precipitator, and the concentration of a sodium hydroxide solution is 5-10mol/L; and selecting ammonia water as a complexing agent, wherein the concentration of the ammonia water solution is 6-12mol/L.
In some specific embodiments, a reaction kettle base solution is prepared, and the pH value of the reaction kettle base solution is adjusted to be 11.0-13.0, and the alkalinity is 20-40g/L.
In some embodiments, the controlled target particle size D1 is D50=1.0 to 3.0 μm, and the controlled target particle size D2 is D50=2.0 to 4.0 μm.
In some embodiments, the temperature of the reaction system in step (3) is controlled to be 50 to 80 ℃, and the stirring speed is 500 to 800rpm.
In some embodiments, the temperature of the reaction system in the step (4) is controlled to be 50 to 80 ℃, and the stirring speed is 400 to 700rpm.
In some embodiments, the concentration is performed by a thickener during the reaction of step (3) and step (4).
Further, when the reaction in the step (4) is finished, the solid content of the reaction system is 400 to 800g/L, preferably 400 to 600g/L.
In some embodiments, 10-15 wt% of alkali liquor is used for aging the reaction slurry, wherein the aging temperature is 50-80 ℃, and the aging reaction time is 60-120 min; controlling the pH value at the washing end point to be 7.5-8.5; the drying temperature is 130 to 160 ℃.
The following is a further description by way of specific examples.
Example 1
(1) According to the formula Ni 0.70 Co 0.2 Mn 0.1 (OH) 2 Preparing 2mol/L nickel-cobalt-manganese mixed metal salt solution; preparing 8mol/L sodium hydroxide solution; preparing 10mol/L ammonia water solution;
(2) 200L of pure water is added into a reaction kettle with the volume of 300L, the temperature is controlled to be 70 ℃, the stirring speed is controlled to be 700rpm, and sodium hydroxide solution is introduced to adjust the pH value to be 12.90 +/-0.10. And (2) introducing the solution in the step (1) into the bottom solution of the reaction kettle in a parallel flow manner, wherein the flow rate of the nickel-cobalt-manganese mixed metal salt solution is 100ml/min, adjusting the flow rate of the sodium hydroxide solution after the reaction starts, stabilizing the pH value in the kettle to 12.90 +/-0.10, controlling the ammonium ion concentration in the kettle to be about 30g/L, and maintaining for 2 hours. The particle size of the reaction slurry was determined to be D50 of 2.0. + -. 0.5. Mu.m.
(3) Pumping the slurry obtained in the step (2) into 2 300L growth kettles respectively at the same flow rate, heating to 75 ℃, and controlling the stirring speed to be 600rpm; and (3) introducing an ammonia water solution to adjust the alkalinity in the kettle to be 12g/L, and introducing the solution in the step (1) into the bottom solution of the reaction kettle in a parallel flow manner, wherein the flow rate of the nickel-cobalt-manganese mixed metal salt solution is 600ml/min, the ammonium ion concentration in the kettle is controlled to be about 25g/L, and the pH value is 11.80 +/-0.10, and the reaction is stopped until the detected slurry D50 is 3.5 +/-0.5 mu m. The concentration is carried out by a thickener, and the solid content of the slurry when the reaction is stopped is controlled to be 600g/L.
(4) Aging, washing, filtering and drying the reaction product obtained in the step (3), wherein 10wt% of alkali liquor is aged, the aging temperature is 75 ℃, and the aging reaction time is 120min; controlling the pH value at the washing end point to be 7.5-8.5; the drying temperature was 140 ℃.
Fig. 1 is an SEM image of the precursor prepared in example 1. The obtained precursor D50 is 2.8 mu m, the tap density is 2.16g/cm and the specific surface area is 13.79m 2 /g。
Example 2
Example 2 differs from example 1 in that: the step (3) is different.
The step (3) in this embodiment is specifically: pumping the slurry in the step (2) into 3 300L growth kettles respectively at the same flow rate, heating to 75 ℃, and controlling the stirring speed to 600rpm; and (2) introducing an ammonia water solution to adjust the alkalinity in the kettle to be 12g/L, and introducing the solution in the step (1) into the bottom solution of the reaction kettle in a parallel flow manner, wherein the flow rate of the nickel-cobalt-manganese mixed metal salt solution is 400ml/min, the ammonium ion concentration in the kettle is controlled to be about 25g/L, the pH value is 11.80 +/-0.10, and the reaction is stopped until the D50 of the slurry is detected to be 3.5 +/-0.5 mu m.
Fig. 2 is an SEM image of the precursor prepared in example 2. The obtained precursor D50 is 3.1 mu m, the tap density is 2.30g/cm, and the specific surface area is 10.96m 2 /g。
Example 3
Example 3 differs from example 1 in that: the step (3) is different.
The step (3) in this embodiment is specifically: pumping the slurry in the step (2) into 5 300L growth kettles respectively at the same flow rate, heating to 75 ℃, and controlling the stirring speed to 600rpm; and (2) introducing an ammonia water solution to adjust the alkalinity in the kettle to be 12g/L, and introducing the solution in the step (1) into the bottom liquid of the reaction kettle in a parallel flow manner, wherein the flow rate of the nickel-cobalt-manganese mixed metal salt solution is 240ml/min, the ammonium ion concentration in the kettle is controlled to be about 25g/L, the pH value is 11.80 +/-0.10, and the reaction is stopped until the D50 of the slurry is detected to be 3.5 +/-0.5 mu m.
Fig. 3 is an SEM image of the precursor prepared in example 3. The obtained precursor D50 is 3.3 mu m, the tap density is 2.21g/cm and the specific surface area is 10.04m 2 /g。
Example 4
Example 4 differs from example 1 in that: the step (3) is different.
The step (3) in this embodiment is specifically: pumping the slurry obtained in the step (2) into 8 300L growth kettles respectively at the same flow rate, heating to 75 ℃, and controlling the stirring speed to be 600rpm; and (3) introducing an ammonia water solution to adjust the alkalinity in the kettle to be 12g/L, and introducing the solution in the step (1) into the bottom solution of the reaction kettle in a parallel flow manner, wherein the flow rate of the nickel-cobalt-manganese mixed metal salt solution is 150ml/min, the ammonium ion concentration in the kettle is controlled to be about 25g/L, and the pH value is 11.80 +/-0.10, and the reaction is stopped until the detected slurry D50 is 3.5 +/-0.5 mu m.
Fig. 4 is an SEM image of the precursor prepared in example 4. The obtained precursor D50 is 3.6 mu m,performing high-speed dry top harvest at tap density of 2.28g/cm, the specific surface area is 9.21m 2 /g。
Comparative example 1
(1) According to the formula Ni 0.70 Co 0.2 Mn 0.1 (OH) 2 Preparing 2mol/L nickel-cobalt-manganese mixed metal salt solution; preparing 8mol/L sodium hydroxide solution; preparing 10mol/L ammonia water solution;
(2) 200L of pure water is added into a reaction kettle with the volume of 300L, the temperature is controlled to be 70 ℃, the stirring speed is controlled to be 700rpm, and sodium hydroxide solution is introduced to adjust the pH value to be 10.90 +/-0.10. And (2) introducing the solution in the step (1) into the bottom liquid of the reaction kettle in a parallel flow manner, wherein the flow of the nickel-cobalt-manganese mixed metal salt solution is 100ml/min, adjusting the flow of the sodium hydroxide solution after the reaction starts, stabilizing the pH value in the kettle to 10.90 +/-0.10, controlling the ammonium ion concentration in the kettle to be about 10g/L, maintaining the growth under the above conditions, and stopping the reaction until the detected slurry D50 is 3.5 +/-0.5 mu m.
(3) Aging, washing, filtering and drying the reaction product obtained in the step (2), wherein 10wt% of alkali liquor is aged, the aging temperature is 75 ℃, and the aging reaction time is 120min; controlling the pH value at the washing end point to be 7.5-8.5; the drying temperature was 140 ℃.
Fig. 5 is an SEM image of the precursor prepared in comparative example 1. The obtained precursor D50 is 3.4 mu m, the tap density is 1.9g/cm, and the specific surface area is 3.70m 2 /g。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (8)
1. A nickel-cobalt-manganese ternary precursor with a chemical formula of Ni x Co y Mn 1-x-y (OH) 2 Wherein x is more than or equal to 0.70 and less than 1.0, and y is more than 0 and less than 0.3; the preparation method is characterized in that the precursor secondary particles are spherical, the primary particles are laminated, and the thickness of the laminated sheet is 50 to 400nm; the particle size D50 of the precursor is 2.0-4.0 mu m, and the tap density is 2.0-2.3g/cm 3 The specific surface area is 5 to 15m 2 /g。
2. The batch preparation method of the nickel-cobalt-manganese ternary precursor according to claim 1, comprising the steps of:
(1) Preparing a nickel-cobalt-manganese mixed salt solution, a precipitator solution and a complexing agent solution;
(2) Preparing a reaction kettle bottom solution;
(3) Adding the nickel-cobalt-manganese mixed salt solution prepared in the step (1), a precipitator solution and a complexing agent solution into the bottom liquid of the reaction kettle in a parallel flow manner, and controlling the adding speed of the nickel-cobalt-manganese mixed salt solution to be V 1 Adjusting the pH value of a system in the reaction kettle to be 11.0 to 13.0 and the alkalinity to be 20 to 40g/L; stopping the reaction when the reaction slurry reaches the target granularity D1 to obtain crystal nucleus slurry;
(4) Evenly conveying the crystal nucleus slurry to N growth kettles, wherein N is a natural number and is more than or equal to 2 and less than or equal to 10; adding the nickel-cobalt-manganese mixed salt solution, the precipitator solution and the complexing agent solution prepared in the step (1) into each growth kettle in a parallel flow manner; adjusting the pH value of the reaction system to 10.0-12.0 and the alkalinity to 15-30g/L;
when the N value is 2, the speed of adding the nickel-cobalt-manganese mixed salt solution into each growth kettle is V 2 ；
When N is a natural number and is more than or equal to 3 and less than or equal to 10, the speed of adding the nickel-cobalt-manganese mixed salt solution into each growth kettle is 2V 2 /N；
(5) And (5) stopping the reaction when the granularity of the reaction slurry in the step (4) reaches the target granularity D2, and obtaining the nickel-cobalt-manganese ternary precursor after the reaction slurry is subjected to aging, solid-liquid separation, washing and solid phase drying.
3. The batch preparation method according to claim 2, wherein the salt of nickel, cobalt and manganese for preparing the nickel-cobalt-manganese mixed salt solution is at least one of sulfate, nitrate and chloride; the total concentration of metal ions in the nickel-cobalt-manganese mixed salt solution is 1.0 to 2.5mol/L.
4. The batch preparation method according to claim 2, wherein the precipitant is sodium hydroxide, and the precipitant solution has a concentration of 5 to 10mol/L; the complexing agent is ammonia water, and the concentration of the complexing agent solution is 6-12mol/L.
5. The batch preparation method according to claim 2, wherein the pH of the reaction kettle base solution is 11.0 to 13.0, and the alkalinity is 20 to 40g/L.
6. The batch preparation process according to claim 2, wherein the target particle size D1 is D50=1.0 to 3.0 μ ι η; the target granularity D2 is D50=2.0 to 4.0 μm.
7. The batch production method according to claim 2, wherein the temperature of the reaction system in the step (3) is controlled to be 50 to 80 ℃, and the stirring speed is 500 to 800rpm; the temperature of the reaction system in the step (4) is controlled to be 50-80 ℃, and the stirring speed is 400-700rpm.
8. The batch production method according to claim 2, wherein during the reaction in the steps (3) and (4), the concentration is carried out by a thickener; and (5) when the reaction in the step (4) is finished, the solid content of the reaction system is 400-800g/L.
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