CN109244580B - Method for efficiently preparing ternary precursor - Google Patents
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- CN109244580B CN109244580B CN201811089219.8A CN201811089219A CN109244580B CN 109244580 B CN109244580 B CN 109244580B CN 201811089219 A CN201811089219 A CN 201811089219A CN 109244580 B CN109244580 B CN 109244580B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the field of electrode materials, in particular to a method for efficiently preparing a ternary precursor, which aims to solve the problems of high preparation cost, strong pollution and the like of the conventional process method for preparing the ternary precursor, and the problems of limited recycling effect of waste batteries, difficult removal of part of impurities and low efficiency, and adopts the following scheme: 1) crushing and grinding the waste batteries, and adding water to carry out rotary evaporation to remove the organic solvent; 2) separating foam slag and sediment by a bubbling separation method; 3) leaching manganese element in the sediment; 4) leaching nickel and cobalt elements in the foam slag, precipitating and collecting; 5) dissolving the nickel-cobalt precipitate in manganese-containing leaching solution, removing iron, drying and ball-milling to obtain a ternary precursor. The method of the invention is different from the traditional mode of gradually removing impurities when the waste battery is used for producing the ternary precursor, and adopts the mode of directly extracting effective components, thereby reducing the cost, reducing the pollution and greatly improving the preparation efficiency.
Description
Technical Field
The invention relates to the field of electrode materials, in particular to a method for efficiently preparing a ternary precursor.
Background
The ternary precursor is used for preparing a high-efficiency lithium ion battery composite positive electrode material used for a new energy automobile, and is prepared from hydroxide Ni of nickel, cobalt and manganesexCoyMnz(OH)2Typical preparation raw materials are nickel salts, cobalt salts and manganese salts. However, nickel and cobalt are expensive metal materials with strategic value, and the preparation of a mixed solution of nickel salt, cobalt salt and manganese salt in large quantities inevitably causes great environmental pollution. Therefore, the existing process method for preparing the ternary precursor generally has the problems of high preparation cost, strong pollution and the like.
In addition, the existing preparation process also comprises a process for preparing a ternary precursor from a waste battery meeting raw material, and impurity metal components are removed in various leaching and deposition modes, but the impurity removal process is difficult to avoid influencing three required elements of nickel, cobalt and manganese, waste is easy to generate, impurity removal is not thorough, and high-efficiency removal of certain metal impurity components is difficult to achieve.
The Chinese patent office discloses an invention patent application of a method for repairing and regenerating a nickel-cobalt-manganese ternary positive electrode material in a waste battery in 2017, 2 month and 15 days, wherein the application publication number is CN106410313A, and the method comprises the following steps: splitting a positive electrode material from a lithium cobaltate waste battery; laying a ternary positive pole piece on a mesh belt, controlling the mesh belt to vibrate continuously, and simultaneously controlling gas to pass through mesh holes of the mesh belt from bottom to top; under the conditions of mesh belt vibration and mesh of the mesh belt gas circulation, respectively heating the ternary positive electrode plate at 100-300 ℃ and 380-520 ℃ for 10-60 minutes, and collecting ternary positive electrode material powder I; sequentially screening the ternary cathode material powder I to remove cracked aluminum foil and electromagnetically removing iron to obtain ternary cathode material powder II, and performing ball milling to obtain ternary cathode material powder III; the ternary cathode material powder III dissolves aluminum powder under weak acidity, the surface of the ternary cathode material is corroded to form the ternary cathode material with high activity and high dispersibility, and the ternary cathode material is used as a nucleating agent to be synthesized and repaired into a spherical ternary precursor material with uniform particles. The method realizes the recycling of the ternary cathode material in the waste battery, but the recycling process flow is crude, only aluminum and iron are effectively removed, and other heavy metal components, such as calcium, copper, lead, carbon, zinc, mercury and the like, are not effectively removed, so that the prepared and repaired ternary cathode material is very limited.
The Chinese patent office also discloses an invention patent application of a method for recovering valuable metals in waste nickel-cobalt-manganese lithium ion batteries in 2018, 2.2.8978, wherein the application publication number is CN 107653378A. And removing copper by replacing iron powder in the leachate, removing iron and aluminum by using water, synthesizing an aluminum-coated nickel, cobalt and manganese ternary cathode material precursor by using the solution after impurity removal through solution preparation, evaporating and concentrating the synthesized solution, and adding carbonate or introducing carbon dioxide to recover lithium. The method can effectively extract four elements of nickel, cobalt, manganese and lithium by an acid dissolution and reducition method, and remove impurity elements such as iron, aluminum and copper, but can not effectively remove elements such as calcium, lead, carbon, zinc and mercury, so that the recovered valuable metal is doped with impurity components with high content.
Disclosure of Invention
The invention provides a method for efficiently preparing a ternary precursor, aiming at solving the problems of high preparation cost, strong pollution and the like of the prior art, limited recycling effect on waste batteries, difficulty in removing part of impurities and low efficiency of the prior art. The method mainly aims to reduce the preparation cost of the ternary precursor and reduce the pollution to the environment in the preparation process. In addition, the invention also directly extracts nickel, cobalt and manganese by directly leaching and depositing the effective component metal nickel, cobalt and manganese, thereby improving the yield of nickel, cobalt and manganese elements in the waste battery treatment process, reducing impurities, improving purity and realizing the purpose of efficiently preparing the ternary precursor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for efficiently preparing a ternary precursor, the method comprising the steps of:
1) taking waste batteries as raw materials, performing operations of disassembling, sorting and crushing on the waste batteries, further grinding the crushed waste batteries until the average particle size is less than or equal to 3mm to obtain material slag, and mixing the material slag with water according to a mass ratio of 1: (6-10) mixing to obtain a suspension, and performing rotary evaporation treatment on the suspension to obtain slurry;
2) separating the slurry obtained in the step 1) by using a bubbling separation method to respectively obtain upper-layer foam slag and lower-layer sediment;
3) slowly adding concentrated sulfuric acid into the sediments obtained in the step 2), standing for 10-15 min after the pH value does not rise any more, and filtering to obtain filtrate;
4) adding 2-3 times of water by weight into the foam slag obtained in the step 2) for size mixing treatment, placing the obtained slurry into a leaching tank, introducing 180-220 ℃ hot air into the leaching tank, keeping the high sealing property of the leaching tank, slowly adding concentrated sulfuric acid until the temperature is raised to 150-170 ℃, and filtering to obtain a red precipitate;
5) adding the red precipitate obtained in the step 4) into the filtrate obtained in the step 3), stirring to completely dissolve the red precipitate to obtain a pre-solution, adjusting the pH value of the pre-solution to 1.0-1.2 by using a pH regulator, filtering out a primary precipitate, adjusting the pH value of the pre-solution to 4.0-5.0, filtering to remove iron precipitate, finally adjusting the pH value to 9.0-10.5, filtering out a secondary precipitate, mixing and drying the primary precipitate and the secondary precipitate, performing ball milling after drying, and obtaining a ternary precursor after ball milling.
The method comprises the steps of firstly grinding the waste batteries into material residues, removing an organic solvent in the waste batteries in a manner of adding water, mixing and matching with rotary evaporation, reducing impurities generated in a subsequent treatment process by the organic solvent, then separating foam residues mainly containing nickel and cobalt and sediments containing manganese by a bubbling separation method, leaching a large amount of manganese elements in the sediments by adopting different in-and-out processes respectively, wherein the leaching rate of the manganese elements in the method is higher than 99 wt%, then leaching nickel, cobalt and iron in the foam residues to generate red precipitates, dissolving the red precipitates in manganese-containing filtrate leached by the sediments again, separating the impurities by adjusting the pH value, precipitating manganese and cobalt and nickel respectively, and mixing, drying and ball-milling the impurities to obtain the ternary precursor.
Preferably, the rotary evaporation treatment in the step 1) is carried out at the temperature of 45-65 ℃.
The rotary evaporation treatment can greatly improve the evaporation speed of the solution, reduce the energy consumption required by the evaporation of the solution, realize the efficient removal of the organic solvent and improve the efficiency of preparation production. The rotary evaporation at the temperature can not only keep the energy consumption low, but also play a role in efficiently removing the organic solvent.
Preferably, the rotary evaporation process in the step 1) concentrates the volume of the suspension to 25-35% of the original volume.
After the suspension is concentrated to 25-35% of the original volume, the organic solvent component is basically completely removed and just can form slurry, and the bubbling separation operation can be directly carried out.
Preferably, the concentrated sulfuric acid used in the step 3) and the step 4) is 1.5-2 mol/L concentrated sulfuric acid.
When the concentrated sulfuric acid is used for treating the sediment, the rest types of metal ions except manganese ions in the sediment are difficult to dissolve out due to the overhigh concentration of the sulfuric acid, and the manganese ions have extremely high solubility under the condition, so that the manganese element is efficiently extracted, the dissolution of impurity metals is reduced, and the filtrate has high-purity manganese sulfate; when the foam slag is treated, the concentrated sulfuric acid is added into the water to generate a large amount of heat, so that the dissolution of each metal component in the foam slag is accelerated, the temperature is continuously raised to 150-170 ℃ after the dissolution under the condition of introducing high-temperature hot air, then a large amount of nickel sulfate, cobalt sulfate and ferric sulfate are separated out, and the rest metal components are still dissolved in the acid solution.
Preferably, after the concentrated sulfuric acid is added in the step 3), the pH value is kept to be less than or equal to 2, and the mixture is not increased any more and then is kept stand for 10-15 min.
After the pH value reaches the range, the manganese element is basically completely dissolved, and the waste is generated by adding concentrated sulfuric acid.
Preferably, the hot air introduced in the step 4) is blown from the bottom of the leaching tank.
Hot air is blown into the bottom, the temperature rise uniformity of the whole solution is higher due to the rising of the hot air, and the precipitation efficiency of nickel, cobalt and iron is improved.
Preferably, the pH adjusting agent used in the step 5) for adjusting the pH of the pre-solution is any one of potassium hydroxide, sodium hydroxide or ammonia water.
The potassium hydroxide, the sodium hydroxide and the ammonia water can all play a role in adjusting the pH value. Wherein the optimal choice is ammonia water, which not only can play a role in slowly and stably adjusting the pH value, but also can further avoid the introduction of impurities.
The invention has the beneficial effects that:
1) the method greatly improves the efficiency of preparing the ternary precursor by taking the waste battery as the raw material;
2) the nickel-cobalt-manganese-iron element is extracted from the waste battery in a targeted manner, and the iron element is effectively removed, so that the impurity metal can be reduced, and the quality of the ternary precursor of the product is improved;
3) the production and preparation cost is reduced, and the pollution to the environment is reduced;
4) the required equipment is simple, the method is suitable for industrial production, and the method has practical application value.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only examples of a part of the present invention, and not all examples. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Example 1
A method for efficiently preparing a ternary precursor, the method comprising the steps of:
1) taking waste batteries as raw materials, performing operations of disassembling, sorting and crushing on the waste batteries, further grinding the crushed waste batteries until the average particle size is less than or equal to 3mm to obtain material slag, and mixing the material slag with water according to a mass ratio of 1: 6 to obtain suspension, placing the suspension at 45 ℃ for rotary evaporation treatment, and concentrating the volume of the suspension to 35% of the original volume in the rotary evaporation process to obtain slurry;
2) separating the slurry obtained in the step 1) by using a bubbling separation method to respectively obtain upper-layer foam slag and lower-layer sediment;
3) slowly adding 1.5 mol/L concentrated sulfuric acid into the sediment obtained in the step 2) until the pH value is 2 and does not rise any more, standing for 15min, and filtering to obtain a filtrate;
4) adding 2 times of water by weight of the foam slag obtained in the step 2) into the foam slag for size mixing treatment, placing the obtained slurry into a leaching tank, blowing 180 ℃ hot air from the bottom of the leaching tank, keeping the high sealing property of the leaching tank, slowly adding 1.5 mol/L concentrated sulfuric acid until the temperature is raised to 150 ℃, and filtering to obtain red precipitate;
5) adding the red precipitate obtained in the step 4) into the filtrate obtained in the step 3), stirring to completely dissolve the red precipitate to obtain a pre-solution, adjusting the pH value of the pre-solution to 1.0 by using potassium hydroxide, filtering out a primary precipitate, adjusting the pH value of the pre-solution to 4.0, filtering to remove iron precipitate, finally adjusting the pH value to 9.0, filtering out a secondary precipitate, mixing and drying the primary precipitate and the secondary precipitate, performing ball milling after drying, and obtaining a ternary precursor after ball milling.
Example 2
A method for efficiently preparing a ternary precursor, the method comprising the steps of:
1) taking waste batteries as raw materials, performing operations of disassembling, sorting and crushing on the waste batteries, further grinding the crushed waste batteries until the average particle size is less than or equal to 3mm to obtain material slag, and mixing the material slag with water according to a mass ratio of 1: 10 to obtain suspension, placing the suspension at 65 ℃ for rotary evaporation treatment, and concentrating the volume of the suspension to 25% of the original volume in the rotary evaporation process to obtain slurry;
2) separating the slurry obtained in the step 1) by using a bubbling separation method to respectively obtain upper-layer foam slag and lower-layer sediment;
3) slowly adding 2 mol/L concentrated sulfuric acid into the sediment obtained in the step 2) until the pH value is 2 and does not rise any more, standing for 10min, and filtering to obtain a filtrate;
4) adding 3 times of water by weight of the foam slag obtained in the step 2) into the foam slag for size mixing treatment, placing the obtained slurry into a leaching tank, blowing 220 ℃ hot air from the bottom of the leaching tank, keeping the high sealing property of the leaching tank, slowly adding 2 mol/L of concentrated sulfuric acid until the temperature is raised to 170 ℃, and filtering to obtain red precipitate;
5) adding the red precipitate obtained in the step 4) into the filtrate obtained in the step 3), stirring to completely dissolve the red precipitate to obtain a pre-solution, adjusting the pH value of the pre-solution to 1.2 by using sodium hydroxide, filtering out a primary precipitate, adjusting the pH value of the pre-solution to 5.0, filtering to remove iron precipitate, finally adjusting the pH value to 10.5, filtering out a secondary precipitate, mixing and drying the primary precipitate and the secondary precipitate, performing ball milling after drying, and obtaining a ternary precursor after ball milling.
Example 3
A method for efficiently preparing a ternary precursor, the method comprising the steps of:
1) taking waste batteries as raw materials, performing operations of disassembling, sorting and crushing on the waste batteries, further grinding the crushed waste batteries until the average particle size is less than or equal to 3mm to obtain material slag, and mixing the material slag with water according to a mass ratio of 1: 8 to obtain suspension, placing the suspension at 65 ℃ for rotary evaporation treatment, and concentrating the volume of the suspension to 30% of the original volume in the rotary evaporation process to obtain slurry;
2) separating the slurry obtained in the step 1) by using a bubbling separation method to respectively obtain upper-layer foam slag and lower-layer sediment;
3) slowly adding 2 mol/L concentrated sulfuric acid into the sediment obtained in the step 2) until the pH value is 1.5 and does not rise any more, standing for 15min, and filtering to obtain a filtrate;
4) adding 3 times of water by weight of the foam slag obtained in the step 2) into the foam slag for size mixing treatment, placing the obtained slurry into a leaching tank, blowing hot air at 200 ℃ from the bottom of the leaching tank, keeping the high sealing property of the leaching tank, slowly adding 2 mol/L concentrated sulfuric acid until the temperature is raised to 170 ℃, and filtering to obtain red precipitate;
5) adding the red precipitate obtained in the step 4) into the filtrate obtained in the step 3), stirring to completely dissolve the red precipitate to obtain a pre-solution, adjusting the pH value of the pre-solution to 1.2 by using ammonia water, filtering to obtain a primary precipitate, adjusting the pH value of the pre-solution to 5.0, filtering to remove iron precipitate, finally adjusting the pH value to 10.5, filtering to obtain a secondary precipitate, mixing and drying the primary precipitate and the secondary precipitate, performing ball milling after drying, and obtaining a ternary precursor after ball milling.
Example 4
A method for efficiently preparing a ternary precursor, the method comprising the steps of:
1) taking waste batteries as raw materials, performing operations of disassembling, sorting and crushing on the waste batteries, further grinding the crushed waste batteries until the average particle size is less than or equal to 3mm to obtain material slag, and mixing the material slag with water according to a mass ratio of 1: 10 to obtain a suspension, placing the suspension at 55 ℃ for rotary evaporation treatment, and concentrating the volume of the suspension to 30% of the original volume in the rotary evaporation process to obtain slurry;
2) separating the slurry obtained in the step 1) by using a bubbling separation method to respectively obtain upper-layer foam slag and lower-layer sediment;
3) slowly adding 2 mol/L concentrated sulfuric acid into the sediment obtained in the step 2) until the pH value is 1.5 and does not rise any more, standing for 15min, and filtering to obtain a filtrate;
4) adding 2.5 times of water by weight of the foam slag obtained in the step 2) into the foam slag for size mixing treatment, placing the obtained slurry into a leaching tank, blowing hot air at 200 ℃ from the bottom of the leaching tank, keeping the high sealing property of the leaching tank, slowly adding 2 mol/L concentrated sulfuric acid until the temperature is raised to 160 ℃, and filtering to obtain red precipitate;
5) adding the red precipitate obtained in the step 4) into the filtrate obtained in the step 3), stirring to completely dissolve the red precipitate to obtain a pre-solution, adjusting the pH value of the pre-solution to 1.2 by using ammonia water, filtering out a primary precipitate, adjusting the pH value of the pre-solution to 5.0, filtering to remove iron precipitate, finally adjusting the pH value to 10.0, filtering out a secondary precipitate, mixing and drying the primary precipitate and the secondary precipitate, performing ball milling after drying, and obtaining a ternary precursor after ball milling.
Example 5
A method for efficiently preparing a ternary precursor, the method comprising the steps of:
1) taking waste batteries as raw materials, performing operations of disassembling, sorting and crushing on the waste batteries, further grinding the crushed waste batteries until the average particle size is less than or equal to 3mm to obtain material slag, and mixing the material slag with water according to a mass ratio of 1: 10 to obtain suspension, placing the suspension at 65 ℃ for rotary evaporation treatment, and concentrating the volume of the suspension to 35% of the original volume in the rotary evaporation process to obtain slurry;
2) separating the slurry obtained in the step 1) by using a bubbling separation method to respectively obtain upper-layer foam slag and lower-layer sediment;
3) slowly adding 2 mol/L concentrated sulfuric acid into the sediment obtained in the step 2) until the pH value is 2 and does not rise any more, standing for 15min, and filtering to obtain a filtrate;
4) adding 3 times of water by weight of the foam slag obtained in the step 2) into the foam slag for size mixing treatment, placing the obtained slurry into a leaching tank, blowing 220 ℃ hot air from the bottom of the leaching tank, keeping the high sealing property of the leaching tank, slowly adding 1.5 mol/L of concentrated sulfuric acid until the temperature is raised to 170 ℃, and filtering to obtain red precipitate;
5) adding the red precipitate obtained in the step 4) into the filtrate obtained in the step 3), stirring to completely dissolve the red precipitate to obtain a pre-solution, adjusting the pH value of the pre-solution to 1.2 by using ammonia water, filtering to obtain a primary precipitate, adjusting the pH value of the pre-solution to 4.8, filtering to remove iron precipitate, finally adjusting the pH value to 10.2, filtering to obtain a secondary precipitate, mixing and drying the primary precipitate and the secondary precipitate, performing ball milling after drying, and obtaining a ternary precursor after ball milling.
The ternary precursors prepared in examples 1 to 5 were examined. The results are shown in the following table.
It is obvious from the above table that the content of impurities in the ternary precursor prepared by the method of the present invention is very low, and the content of the three elements of nickel, cobalt and manganese depends on the waste battery of the raw material, so that the use ratio of the manganese-containing filtrate and the nickel, cobalt precipitate in the preparation process can be adjusted to a certain extent, and the high efficiency preparation can be realized.
Claims (7)
1. A method for efficiently preparing a ternary precursor, comprising the steps of:
1) taking ternary waste batteries containing nickel, cobalt and manganese as raw materials, performing operations of disassembling, sorting and crushing on the waste batteries, further grinding the crushed waste batteries until the average particle size is less than or equal to 3mm to obtain material slag, and mixing the material slag with water according to a mass ratio of 1: (6-10) mixing to obtain a suspension, and performing rotary evaporation treatment on the suspension to obtain slurry;
2) separating the slurry obtained in the step 1) by using a bubbling separation method to respectively obtain foam slag containing nickel and cobalt on the upper layer and manganese-containing sediment on the lower layer;
3) slowly adding concentrated sulfuric acid into the sediments obtained in the step 2), standing for 10-15 min after the pH value does not rise any more, and filtering to obtain filtrate;
4) adding 2-3 times of water by weight into the foam slag obtained in the step 2) for size mixing treatment, placing the obtained slurry into a leaching tank, introducing 180-220 ℃ hot air into the leaching tank, keeping the high sealing property of the leaching tank, slowly adding concentrated sulfuric acid until the temperature is raised to 150-170 ℃, and filtering to obtain a red precipitate containing nickel, cobalt and iron;
5) adding the red precipitate obtained in the step 4) into the filtrate obtained in the step 3), stirring to completely dissolve the red precipitate to obtain a pre-solution, adjusting the pH value of the pre-solution to 1.0-1.2 by using a pH regulator, filtering to obtain a primary precipitate containing manganese, adjusting the pH value of the pre-solution to 4.0-5.0, filtering to remove iron precipitate, finally adjusting the pH value to 9.0-10.5, filtering to obtain a secondary precipitate containing nickel and cobalt, mixing the primary precipitate and the secondary precipitate, drying, performing ball milling after drying, and obtaining a ternary precursor containing nickel, cobalt and manganese after the ball milling is finished.
2. The method for efficiently preparing the ternary precursor according to claim 1, wherein the rotary evaporation treatment in the step 1) is performed at 45-65 ℃.
3. The method for efficiently preparing the ternary precursor according to claim 1 or 2, wherein the rotary evaporation process in the step 1) concentrates the volume of the suspension to 25-35% of the original volume.
4. The method for efficiently preparing the ternary precursor according to claim 1, wherein the concentrated sulfuric acid used in the step 3) and the step 4) is 1.5-2 mol/L.
5. The method for efficiently preparing the ternary precursor according to claim 1 or 4, wherein the pH value is kept to be less than or equal to 2 after the concentrated sulfuric acid is added in the step 3), and the mixture is kept standing for 10-15 min after the pH value does not rise any more.
6. The method for efficiently preparing the ternary precursor according to claim 1, wherein the hot air introduced in step 4) is blown from the bottom of the leaching tank.
7. The method for efficiently preparing the ternary precursor according to claim 1, wherein the pH regulator used in the step 5) for adjusting the pH of the pre-solution is any one of potassium hydroxide, sodium hydroxide or ammonia water.
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