CN111293305A - Hexagonal flaky nickel cobalt lithium manganate precursor and preparation method thereof - Google Patents
Hexagonal flaky nickel cobalt lithium manganate precursor and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a hexagonal flaky nickel cobalt lithium manganate precursor and a preparation method thereof. The hexagonal flaky nickelic nickel cobalt lithium manganate precursor disclosed by the invention starts from the micro morphology of the material, increases the nucleation amount of coprecipitation reaction by adding a crystal face growth inducer, and controls the growth speed of crystal grains, so that precipitated particles with uniform and concentrated particle size distribution are generated, the precipitated particles preferentially grow on a certain/or certain crystal faces to form crystal particles with a regular hexagonal flaky structure and are inserted into the precursor, the vertical embedded flaky structure which is a dotted, needle-shaped or tiled flaky structure is avoided, the rapid lithium ion insertion structure in the sintering process is facilitated, the sintering process can be effectively simplified, the sintering temperature is reduced, and the uniform single crystal anode material can be obtained after sintering.
Description
Technical Field
The invention belongs to the field of lithium ion battery materials, and particularly relates to a hexagonal flaky nickel cobalt lithium manganate precursor and a preparation method thereof.
Background
With the increasing demand of new energy automobile market, the demand of domestic lithium ion batteries is also rapidly increased. The positive electrode material of the lithium ion battery directly affects the comprehensive performance of the lithium ion battery and is considered as the most critical part of the lithium ion battery. At present, most of anode materials researched by various manufacturers at home and abroad are secondary spherical particles formed by agglomeration of fine grains. Conventional ternary materials are usually made into secondary spheres of about ten microns in size, which are formed by agglomeration of primary particles, in order to increase the density. However, when the secondary spherical particles are used for manufacturing battery pole pieces, the secondary spherical particles are easy to break under high rolling pressure. Furthermore, the volume expansion and contraction of the electrode material during cycling can also cause the material particles to break up. Such secondary particle breakage exposes internal active materials, increases side reactions with the electrolyte and aggravates elution of metal ions, resulting in deterioration of electrical properties.
The single crystal material has good mechanical strength and pressure resistance due to the unique microscopic morphology, and is not easy to break in the compaction process, so that the single crystal material is not easy to break in the electrode rolling and charging and discharging processes. Because the number of grain boundaries is small, the stress concentration point is small, the interface is stable, the generation and the diffusion of microcracks caused by the phase change of a positive electrode material in the charging and discharging processes can be reduced, and the contact interface between an active material and an electrolyte is reduced, so that the generation of gas is reduced, the single crystal ternary material becomes an important development direction of the ternary material.
For the synthesis of the single crystal ternary material, the selection of a proper precursor is crucial. The physical and chemical properties of the crystal structure, the micro morphology, the particle size distribution and the like of the precursor determine the comprehensive performance of the later-stage anode material. However, the existing single crystal ternary precursor has the problems of high crystal nucleus crystallization degree and long grain growth time, and most of the single crystal ternary precursor needs to be subjected to secondary roasting, so that the material processing cost is increased, and the energy consumption is high.
Disclosure of Invention
The invention aims to provide a hexagonal flaky nickel cobalt lithium manganate precursor with low cost and unique microstructure and a preparation method thereof.
The hexagonal flaky nickel cobalt lithium manganate precursor has a hexagonal flaky structure of primary particles, and loose particles formed by stacking flaky hexagons in a mutually-inserted manner.
D50 of nickel cobalt lithium manganate precursor is 3-5 um, and the length of primary particle is 400-600 nm.
The molecular formula of the nickel cobalt lithium manganate precursor is NiaCobMnc(OH)2Wherein a + b + c is 1, a is not less than 0.6, b is not more than 0.2, and c is not more than 0.2.
The preparation method of the hexagonal flaky nickel cobalt lithium manganate precursor comprises the following steps:
(1) solution preparation: according to the formula NiaCobMnc(OH)2Preparing a soluble salt solution by the molar ratio of metal elements Ni, Co and Mn, wherein a + b + c is 1, a is more than or equal to 0.6, b is less than or equal to 0.2, and c is less than or equal to 0.2; preparing a complexing agent into a complexing agent aqueous solution; preparing a precipitant into a precipitant aqueous solution; dispersing a crystal face growth inducer in water as a reaction base solution;
(2) coprecipitation reaction: putting the reaction bottom solution into a reaction kettle, starting stirring, then under the protection of inert gas and at a set temperature, adding a soluble salt solution, a complexing agent solution and a precipitator solution into the reaction kettle in a parallel flow manner, starting a precipitation reaction, and after the reaction is finished, stopping adding the solution in the parallel flow manner to obtain a reaction product;
(3) preparing a precursor: and (3) aging, washing, filtering, drying and screening the reaction product obtained in the step (2) to obtain a precursor.
In the step (1), the total concentration of metal ions in the soluble salt solution is 0.5-5 mol, the soluble nickel salt is one of nickel sulfate, nickel nitrate, nickel acetate and nickel chloride, the soluble cobalt salt is one of cobalt sulfate, cobalt nitrate, cobalt acetate and cobalt chloride, and the soluble manganese salt is one of manganese sulfate, manganese nitrate, manganese acetate and manganese chloride; the complexing agent is one of ammonia water, ammonium bicarbonate and ammonium carbonate, and the concentration of the aqueous solution of the complexing agent is 2-14 mol/L; the precipitator is one of sodium hydroxide, potassium hydroxide and lithium hydroxide, and the concentration of the precipitator aqueous solution is 1-10 mol/L; the crystal face growth inducer is one or more of polyacrylamide, polyvinyl alcohol, polyoxyethylene, sodium polyacrylate, sodium alginate and polyvinylpyrrolidone, and the mass ratio of the crystal face growth inducer to the aqueous solution is (0.01-0.1)% to 1.
In the step (2), the set temperature is 40-80 ℃, and the stirring speed is 200-1200 r/min; when the three solutions are added in parallel, the pH value of a reaction system needs to be controlled to be 11.0-12.5, the increase of the pH is beneficial to enabling the nucleation speed of crystal grains to be larger than the growth speed at the initial stage of reaction, so that a precursor with uniform and concentrated particle size distribution is obtained, and the increase of ammonia water is beneficial to changing the appearance and size of primary particles. The content of solid matters in the reaction system is controlled to be 50-220 g/L, and the retention time of the materials in the reactor is controlled to be 5-50 h.
Preferably, the stirring speed is 300-900 r/min; when the stirring speed is controlled to be 300-900 r/min, the particles cannot be sufficiently rubbed, collided and sheared due to too low stirring speed, the tap density of the particles can be reduced, and the reaction time can be prolonged and the cost is increased due to too high stirring speed.
Preferably, the complexing agent is ammonia water, and in the coprecipitation reaction, the concentration of the ammonia water in the reaction system needs to be controlled to be 10-28 g/L;
in the step 3), during aging, the stirring speed is reduced to 100-500 r/min, and the aging time is controlled to be 4-48 h; when washing, washing by adopting a sodium hydroxide solution; and during drying, the drying temperature is 60-150 ℃ until the material is light black or dark brown.
The principle of the invention is that a crystal face growth inducer is added in the synthesis process of the precursor, the crystal face growth inducer has the functions of ① being beneficial to reducing the supersaturation degree of a system at the initial stage of reaction, forming a large number of crystal nuclei, controlling the growth speed of crystal grains, and generating particles with uniform and concentrated particle size distribution. ② ensures that precipitated particles preferentially grow on a certain/or certain crystal faces to form crystal particles with a regular hexagonal sheet structure, and avoids forming the crystal particles into a point-shaped, needle-shaped or flat-laid sheet structure.
The invention has the beneficial effects that: 1) the primary particles of the precursor are hexagonal flaky, and the primary flaky particles are stacked to form secondary particles with a loose structure, so that the structure is favorable for forming a single crystal positive material with stable, excellent and uniform performance after sintering. 2) The hexagonal flaky nickelic nickel cobalt lithium manganate precursor disclosed by the invention starts from the micro morphology of the material, increases the nucleation amount of coprecipitation reaction by adding a crystal face growth inducer, and controls the growth speed of crystal grains, so that precipitated particles with uniform and concentrated particle size distribution are generated, the precipitated particles preferentially grow on a certain/or certain crystal faces to form crystal particles with a regular hexagonal flaky structure and are inserted into the precursor, the vertical embedded flaky structure which is a dotted, needle-shaped or tiled flaky structure is avoided, the rapid lithium ion insertion structure in the sintering process is facilitated, the sintering process can be effectively simplified, the sintering temperature is reduced, and the uniform single crystal anode material can be obtained after sintering. 3) The production method of the hexagonal flaky high-nickel cobalt lithium manganate precursor is simple and easy to implement, can effectively save cost, and is easy to realize industrialization. 4) The single crystal ternary cathode material prepared from the hexagonal flaky nickel cobalt lithium manganate precursor has high specific capacity and good cycle performance.
Drawings
FIG. 1 is a scanning electron microscope image of a hexagonal flaky nickel cobalt lithium manganate precursor prepared in example 1
FIG. 2 is an electron microscope scanning photograph of the lithium nickel cobalt manganese oxide single crystal cathode material prepared in example 1.
FIG. 3 is a scanning electron microscope image of the hexagonal flaky nickel cobalt lithium manganate precursor prepared in example 2
FIG. 4 is a scanning electron microscope image of the lithium nickel cobalt manganese oxide single crystal cathode material prepared in example 2.
FIG. 5 is a scanning electron microscope image of hexagonal flaky nickel cobalt lithium manganate precursor prepared in example 3
FIG. 6 is a scanning electron microscope image of the hexagonal flaky nickel cobalt lithium manganate precursor prepared in comparative example 1.
FIG. 7 is a scanning electron microscope image of the lithium nickel cobalt manganese oxide single crystal cathode material prepared in comparative example 1.
Detailed Description
Example 1
In the embodiment, the molecular formula of the hexagonal flaky nickel cobalt lithium manganate precursor is Ni0.8Co0.1Mn0.1(OH)2。
The preparation method comprises the following steps:
(1) preparing nickel sulfate, cobalt sulfate and manganese sulfate into a nickel-cobalt-manganese salt solution with the total metal ion concentration of 2mol/L according to the molar ratio of nickel, cobalt and manganese in the molecular formula (wherein the nickel ion concentration is 1.6mol/L, the cobalt particle concentration is 0.2mol/L, and the manganese ion concentration is 0.2 mol/L); preparing a sodium hydroxide solution into a precipitator solution of 4mol/L, and preparing ammonia water into a complexing agent solution of 6 mol/L.
(2) 5L of deionized water and 5g of polyacrylamide are added into a reaction kettle, stirring is started, the rotating speed is controlled at 600r/min, the temperature is raised to 60 ℃, and nitrogen is continuously introduced.
(3) And (2) adding the metal salt solution, the precipitator solution and the complexing agent solution in the step (1) into a reaction kettle in a concurrent flow manner for coprecipitation reaction, keeping the pH value stable at 12.0 during the reaction, controlling the content of solid matters in the reaction system to be 80g/L, controlling the concentration of ammonia water in the reaction system to be 28g/L, continuously reacting for 37h, and finishing the reaction.
(4) Stopping feeding after the reaction is finished, aging at the rotating speed of 300r/min for 8h, washing after the aging is finished, filtering, and drying at 100 ℃ for 12h to obtain the hexagonal flaky high-nickel-cobalt lithium manganate precursor.
The precursor prepared in this example is subjected to SEM test, and the microstructure of the precursor is shown in fig. 1, and as can be seen from fig. 1, the primary particles of the precursor are hexagonal sheets, and the hexagonal sheets are stacked to form secondary particles having a loose structure. The median particle size of the precursor is 3.0 mu m through testing, and the length of the complete primary particles (sheet hexagons) is 500-600 nm.
After the precursor of the embodiment is mixed with lithium and sintered at high temperature, a lithium nickel cobalt manganese oxide single crystal positive electrode material is obtained, SEM analysis of the positive electrode material is shown in fig. 2, and electrochemical performance data of a battery made of the lithium nickel cobalt manganese oxide positive electrode material is shown in table 1.
Example 2
In the embodiment, the molecular formula of the hexagonal flaky nickel cobalt lithium manganate precursor is Ni0.8Co0.1Mn0.1(OH)2。
The preparation method comprises the following steps:
(1) preparing nickel sulfate, cobalt sulfate and manganese sulfate into a nickel-cobalt-manganese salt solution with the total metal ion concentration of 1.5mol/L according to the molar ratio of nickel, cobalt and manganese in the molecular formula (wherein the nickel ion concentration is 1.2mol/L, the cobalt particle concentration is 0.15mol/L, and the manganese ion concentration is 0.15 mol/L); preparing 5mol/L precipitator solution from sodium hydroxide solution, and preparing 8mol/L complexing agent solution from ammonia water.
(2) 5L of deionized water and 5g of polyacrylamide are added into a reaction kettle, stirring is started, the rotating speed is controlled at 800r/min, the temperature is raised to 55 ℃, and nitrogen is continuously introduced.
(3) And (2) adding the metal salt solution, the precipitator solution and the complexing agent solution in the step (1) into a reaction kettle in a concurrent flow manner for coprecipitation reaction, keeping the pH value stable at 11.6 during the reaction, controlling the content of solid matters in the reaction system to be 100g/L, controlling the concentration of ammonia water in the reaction system to be 28g/L, and continuously reacting for 21 hours.
(4) Stopping feeding after the reaction is finished, aging at the rotating speed of 400r/min for 12h, washing after the aging is finished, filtering, and drying at 120 ℃ for 12h to obtain the hexagonal flaky high-nickel-cobalt lithium manganate precursor.
The precursor prepared in this example is subjected to SEM test, and the microstructure of the precursor is shown in fig. 3, and as can be seen from fig. 1, the primary particles of the precursor are hexagonal sheets, and the hexagonal sheets are stacked to form secondary particles having a loose structure. The median particle size of the precursor is 5.5 mu m through testing, and the length of the complete primary particles (sheet hexagons) is 400-500 nm.
After the precursor of the embodiment is mixed with lithium and sintered at high temperature, a lithium nickel cobalt manganese oxide single crystal positive electrode material is obtained, SEM analysis of the positive electrode material is shown in fig. 4, the lithium nickel cobalt manganese oxide positive electrode material is made into a battery, and the electrochemical performance data of the lithium nickel cobalt manganese oxide positive electrode material is shown in table 1.
Example 3
In the embodiment, the molecular formula of the hexagonal flaky nickel cobalt lithium manganate precursor is Ni0.6Co0.2Mn0.2(OH)2。
The preparation method comprises the following steps:
(1) preparing nickel sulfate, cobalt sulfate and manganese sulfate into a nickel-cobalt-manganese salt solution with the total metal ion concentration of 2.5mol/L according to the molar ratio of nickel, cobalt and manganese in the molecular formula (wherein the nickel ion concentration is 1.5mol/L, the cobalt particle concentration is 0.5mol/L, and the manganese ion concentration is 0.5 mol/L); preparing 9mol/L precipitator solution from sodium hydroxide solution, and preparing 11mol/L complexing agent solution from ammonia water.
(2) 5L of deionized water and 0.5g of polyacrylamide are added into a reaction kettle, stirring is started, the rotating speed is controlled at 900r/min, the temperature is raised to 50 ℃, and nitrogen is continuously introduced.
(3) And (2) adding the metal salt solution, the precipitator solution and the complexing agent solution in the step (1) into a reaction kettle in a concurrent flow manner for coprecipitation reaction, keeping the pH value stable at 12.0 during the reaction, controlling the content of solid matters in the reaction system to be 110g/L, controlling the concentration of ammonia water in the reaction system to be 18g/L, continuously reacting for 28h, and finishing the reaction.
(4) Stopping feeding after the reaction is finished, aging at the rotating speed of 400r/min for 12h, washing after the aging is finished, filtering, and drying at 120 ℃ for 12h to obtain the hexagonal flaky high-nickel-cobalt lithium manganate precursor.
The precursor prepared in this example is subjected to SEM test, and the microstructure of the precursor is shown in fig. 5, and it can be seen from fig. 5 that the primary particles of the precursor are hexagonal plates, and the surface structure of the secondary particles is loose. The median particle size of the precursor is 3.5 mu m through testing, and the length of the complete primary particles (sheet hexagons) is 500-600 nm.
Comparative example 1
In the comparative example, the molecular formula of the precursor is Ni0.8Co0.1Mn0.1(OH)2，
The preparation method comprises the following steps:
(1) preparing nickel sulfate, cobalt sulfate and manganese sulfate into a nickel-cobalt-manganese salt solution with the total metal ion concentration of 2mol/L according to the molar ratio of nickel, cobalt and manganese in the molecular formula (wherein the nickel ion concentration is 1.6mol/L, the cobalt particle concentration is 0.2mol/L, and the manganese ion concentration is 0.2 mol/L); preparing a sodium hydroxide solution into a precipitator solution of 4mol/L, and preparing ammonia water into a complexing agent solution of 6 mol/L.
(2) 5L of deionized water is added into a reaction kettle, ammonia water and sodium hydroxide are added to ensure that the pH value is 12.1, the mixture is used as reaction base liquid, stirring is started, the rotating speed is controlled at 600r/min, the temperature is raised to 60 ℃, and nitrogen is continuously introduced.
(3) And (2) adding the metal salt solution, the precipitator solution and the complexing agent ammonia water solution in the step (1) into a reaction kettle in a concurrent flow manner for coprecipitation reaction, keeping the pH value stable at 12.1 during the reaction, controlling the content of solid matters in the reaction system to be 80g/L, controlling the concentration of ammonia water in the reaction system to be 28g/L, continuously reacting for 37h, and stopping feeding.
(4) Stopping feeding after the reaction is finished, aging at the rotating speed of 300r/min for 8h, washing after the aging is finished, filtering, and drying at 100 ℃ for 12h to obtain the nickel cobalt lithium manganate monocrystal precursor.
SEM characterization of the precursor prepared in the comparative example is carried out, the result is shown in FIG. 6, and the precursor Ni is Ni0.8Co0.1Mn0.1(OH)2The primary particles are grain-shaped, the secondary particles are sphere-like with good dispersibility, uniform particles and compact interior, the granularity in the precursor is about 5.0 mu m, and the length of the primary particles is 200-300 nm.
The precursor of the comparative example is mixed with lithium and sintered at high temperature to obtain the lithium nickel cobalt manganese oxide single crystal anode material, the result of SEM analysis of the anode material is shown in figure 7, the electrochemical performance data of the lithium nickel cobalt manganese oxide single crystal anode material prepared into a battery is shown in table 1,
TABLE 1 electrochemical performance of the cells of examples 1-2 and comparative examples
Example 4
In the embodiment, the molecular formula of the hexagonal flaky nickel cobalt lithium manganate precursor is Ni0.7Co0.15Mn0.15(OH)2。
The preparation method comprises the following steps:
(1) preparing nickel sulfate, cobalt sulfate and manganese sulfate into a nickel-cobalt-manganese salt solution with the total metal ion concentration of 5mol/L according to the molar ratio of nickel, cobalt and manganese in the molecular formula (wherein the nickel ion concentration is 3.5mol/L, the cobalt particle concentration is 0.75mol/L, and the manganese ion concentration is 0.75 mol/L); preparing 6mol/L precipitator solution from sodium hydroxide solution, and preparing 6mol/L complexing agent solution from ammonia water.
(2) 5L of deionized water and 0.5g of polyacrylamide are added into a reaction kettle, stirring is started, the rotating speed is controlled at 900r/min, the temperature is increased to 80 ℃, and nitrogen is continuously introduced.
(3) And (2) adding the metal salt solution, the precipitator solution and the complexing agent solution in the step (1) into a reaction kettle in a concurrent flow manner for coprecipitation reaction, keeping the pH value stable at 12.0 during the reaction, controlling the content of solid matters in the reaction system to be 200g/L, controlling the concentration of ammonia water in the reaction system to be 28g/L, continuously reacting for 50h, and finishing the reaction.
(4) Stopping feeding after the reaction is finished, aging at the rotating speed of 400r/min for 12h, washing after the aging is finished, filtering, and drying at 120 ℃ for 12h to obtain the hexagonal flaky high-nickel-cobalt lithium manganate precursor.
Example 5
In the embodiment, the molecular formula of the hexagonal flaky nickel cobalt lithium manganate precursor is Ni0.8Co0.2Mn0.2(OH)2。
The preparation method comprises the following steps:
(1) preparing nickel sulfate, cobalt sulfate and manganese sulfate into a nickel-cobalt-manganese salt solution with the total metal ion concentration of 1.0mol/L according to the molar ratio of nickel, cobalt and manganese in the molecular formula (wherein the nickel ion concentration is 0.8mol/L, the cobalt particle concentration is 0.2mol/L, and the manganese ion concentration is 0.2 mol/L); preparing a 2mol/L precipitator solution from a sodium hydroxide solution, and preparing a 1mol/L complexing agent solution from ammonia water.
(2) 5L of deionized water and 3g of polyacrylamide are added into a reaction kettle, stirring is started, the rotating speed is controlled at 400r/min, the temperature is increased to 40 ℃, and nitrogen is continuously introduced.
(3) And (2) adding the metal salt solution, the precipitator solution and the complexing agent solution in the step (1) into a reaction kettle in a concurrent flow manner for coprecipitation reaction, keeping the pH value stable at 11.4 during the reaction, controlling the content of solid matters in the reaction system to be 50g/L, controlling the concentration of ammonia water in the reaction system to be 10g/L, continuously reacting for 50h, and finishing the reaction.
(4) Stopping feeding after the reaction is finished, aging at the rotating speed of 300r/min for 10h, washing after the aging is finished, filtering, and drying at 100 ℃ for 12h to obtain the hexagonal flaky high-nickel-cobalt lithium manganate precursor.
Claims (8)
1. The hexagonal flaky nickel cobalt lithium manganate precursor is characterized in that primary particles of the precursor are of a hexagonal flaky structure, and secondary particles of the precursor are loose particles formed by stacking flaky hexagonal structures in an embedded manner.
2. According to claimThe hexagonal flaky nickel cobalt lithium manganate precursor of claim 1, characterized in that the molecular formula of the nickel cobalt lithium manganate precursor is NiaCobMnc(OH)2Wherein a + b + c is 1, a is more than or equal to 0.6, b is less than or equal to 0.2, and c is less than or equal to 0.2; d50 of the precursor of the nickel cobalt lithium manganate precursor is 3-6 um, and the length of the primary particle is 400-600 nm.
3. A method for preparing a hexagonal plate-shaped nickel cobalt lithium manganate precursor according to claim 1 or 2, comprising the steps of:
(1) solution preparation: according to the formula NiaCobMnc(OH)2Preparing soluble salt solution by the molar ratio of metal elements Ni, Co and Mn in the solution; preparing a complexing agent into a complexing agent aqueous solution; preparing a precipitant into a precipitant aqueous solution; dispersing a crystal face growth inducer in water as a reaction base solution;
(2) coprecipitation reaction: putting the reaction bottom solution into a reaction kettle, starting stirring, then under the protection of inert gas and at a set temperature, adding a soluble salt solution, a complexing agent solution and a precipitator solution into the reaction kettle in a parallel flow manner, starting a precipitation reaction, and after the reaction is finished, stopping adding the solution in the parallel flow manner to obtain a reaction product;
(3) preparing a precursor: and (3) aging, washing, filtering, drying and screening the reaction product obtained in the step (2) to obtain a precursor.
4. The method for preparing the hexagonal flaky nickel cobalt lithium manganate precursor according to claim 3, wherein in the step (1), the total concentration of metal ions in the soluble salt solution is 0.5-5 mol, the soluble nickel salt is one of nickel sulfate, nickel nitrate, nickel acetate and nickel chloride, the soluble cobalt salt is one of cobalt sulfate, cobalt nitrate, cobalt acetate and cobalt chloride, and the soluble manganese salt is one of manganese sulfate, manganese nitrate, manganese acetate and manganese chloride; the complexing agent is one of ammonia water, ammonium bicarbonate and ammonium carbonate, and the concentration of the aqueous solution of the complexing agent is 2-14 mol/L; the precipitator is one of sodium hydroxide, potassium hydroxide and lithium hydroxide, and the concentration of the precipitator aqueous solution is 1-10 mol/L; the crystal face growth inducer is one or more of polyacrylamide, polyvinyl alcohol, polyoxyethylene, sodium polyacrylate, sodium alginate and polyvinylpyrrolidone, and the mass ratio of the inducer to the aqueous solution is (0.01-0.1)% to 1.
5. The method for preparing the hexagonal flaky nickel cobalt lithium manganate precursor according to claim 3, wherein in the step (2), the temperature is set to be 40-80 ℃, and the stirring speed is 200-1200 r/min; when the three solutions are added in a parallel flow manner, the pH value of a reaction system needs to be controlled to be 11.0-12.5, the content of solid matters in the reaction system is controlled to be 5-220 g/L, and the retention time of materials in a reactor is controlled to be 5-50 h.
6. The method for preparing the hexagonal flaky nickel cobalt lithium manganate precursor according to claim 5, wherein the stirring speed is 300-900 r/min.
7. The method for preparing the hexagonal flaky nickel cobalt lithium manganate precursor according to claim 4 or 5, wherein the concentration of ammonia water in a reaction system is controlled to be 10-35 g/L during coprecipitation reaction of complexing agent ammonia water.
8. The method for preparing the hexagonal flaky nickel cobalt lithium manganate precursor according to claim 3, wherein in the step 3), during aging, the stirring speed is reduced to 100-500 r/min, and the aging time is controlled to 4-48 h; when washing, washing by adopting a sodium hydroxide solution; and during drying, the drying temperature is 60-150 ℃ until the material is light black or black brown.
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