CN112939095A - Spherical high-nickel cobalt-free single crystal precursor and preparation method thereof - Google Patents
Spherical high-nickel cobalt-free single crystal precursor and preparation method thereof Download PDFInfo
- Publication number
- CN112939095A CN112939095A CN202110130581.0A CN202110130581A CN112939095A CN 112939095 A CN112939095 A CN 112939095A CN 202110130581 A CN202110130581 A CN 202110130581A CN 112939095 A CN112939095 A CN 112939095A
- Authority
- CN
- China
- Prior art keywords
- nickel
- reaction
- solution
- precursor
- manganese
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/006—Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
-
- 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
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a spherical high-nickel cobalt-free single crystal precursor and a preparation method thereof, wherein the low coprecipitation reaction temperature is 20-40 ℃, the crystallinity of the precursor is effectively reduced and the ratio of the precursor is improved by increasing the feeding speed section by section, changing the pH value and the like, and in addition, the invention adopts a long-diameter paddle, the paddle diameter/kettle diameter is 0.50-0.65, the stirring strength is improved, and the dispersity and the sphericity of the single crystal precursor are improved. The invention has simple process and easy control of the process, is suitable for large-scale production, and the prepared high-nickel cobalt-free monocrystal precursor has good dispersibility, good sphericity and a specific surface of more than or equal to 20m2The crystallinity is low, and the full width at half maximum FWHM of the precursor obtained by XRD test101Not less than 0.8, and obvious sintering single crystallization.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery anode materials, and particularly belongs to a spherical high-nickel cobalt-free single crystal precursor and a preparation method thereof.
Background
Because cobalt belongs to scarce resources, the fluctuation of cobalt price is larger, and the development of cobalt-free products is technically accelerated for getting rid of monopoly control of resources. The high-nickel cobalt-free material has the advantages that rare cobalt elements are removed, the material cost is reduced, the nickel content is improved, the specific capacity of the material is improved, and meanwhile, the manganese content is increased, so that the effect of stabilizing the structure can be achieved. However, the content of nickel is increased and cobalt is completely absent, which causes the adverse results of poor material conductivity, serious lithium nickel mixed discharge, poor thermal stability and the like, and particularly, when the high nickel cobalt-free material is a polycrystalline material, the Direct Current Resistance (DCR) of the material is obviously increased due to cobalt-free, the material is pulverized due to serious phase change, and the like.
The single crystal material has the advantages of good structural stability, long cycle life, high safety and the like, can effectively solve the problems of cobalt-free materials, and in addition, the precursors with small grain diameters of the single crystal also have the problems of easy agglomeration, poor sphericity, poor sintering consistency and the like. The high-nickel cobalt-free single crystal anode material is an effective strategy for solving the cobalt-free problem, so that the development of a corresponding precursor is very critical. The conventional coprecipitation method for preparing the precursor generally adopts 50-60 ℃ as the coprecipitation reaction temperature, and adopts an intermittent method for keeping the flow constant, so that the prepared precursor generally has high crystallinity and small specific surface, and is not beneficial to sintering into a single-crystal product, the precursor with small grain size is easy to agglomerate and has poor sphericity, the consistency of a sintered corresponding anode product is poor, the DCR is high, the electrical property is poor, and the sintering cost is increased due to the higher sintering temperature. Therefore, the development of a precursor with large specific surface, low crystallinity and high sphericity aiming at the high-nickel cobalt-free material is particularly critical.
Disclosure of Invention
In order to solve the problems that a high-nickel cobalt-free precursor prepared by a conventional coprecipitation method has high crystallinity and a small specific surface and is not beneficial to sintering single crystallization, the invention provides a spherical high-nickel cobalt-free single crystal precursor and a preparation method thereof, which effectively improve the specific surface of the precursor, reduce the crystallinity of materials, improve the sphericity of a small-particle-size precursor and further are beneficial to the consistency of a sintering process and sintering single crystallization.
In order to achieve the purpose, the invention provides the following technical scheme: a spherical high-nickel cobalt-free monocrystal precursor with Ni as molecular formulaxMnyMz(OH)2Wherein x + y + z is 1, x is more than or equal to 0.6 and less than 1.0, z is more than or equal to 0 and less than or equal to 0.05, M is a doping element, and the specific surface area of the spherical high-nickel cobalt-free single crystal precursor is 20M2/g~50m2(iv) a half-peak width of 0.8 to 1.80.
The invention provides a preparation method of a spherical high-nickel cobalt-free single crystal precursor, which comprises the following steps:
s1 taking Ni: preparing a nickel-manganese mixed salt solution with the concentration of 1.0-2.0 mol/L from nickel salt and manganese salt with the Mn being x, y;
s2, preparing a reaction base solution from the alkali solution and the ammonia solution, and adjusting the pH value of the reaction base solution to 12.5-13.0;
s3, introducing a nickel-manganese mixed salt solution, a doped element salt solution, an alkali solution and an ammonia solution into the reaction bottom solution at the same time, controlling the reaction temperature to be 20-40 ℃, adjusting the pH value of the reaction solution and the feeding speed of the nickel-manganese mixed salt solution according to the median particle size of the reaction product in the reaction process, stopping feeding when the median particle size of the reaction product is 2.5-4.0 mu m, and then filtering, washing, drying, screening and removing iron to obtain the spherical high-nickel cobalt-free single crystal precursor.
Further, in step S3, when the median particle size of the reaction product is more than 0 and less than D50 and less than 2 μm, the pH value of the reaction process is controlled to be 12.3-13.0; when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m, controlling the pH value in the reaction process to be 11.5-12.2.
Further, in step S3, when the median particle diameter of the reaction product is more than 0 and less than D50 and less than 1.5 microns, controlling the flow rate of the nickel-manganese mixed salt to be 200L/h-400L/h; when the median particle size of the reaction product is more than or equal to 1.5 mu m and more than or equal to D50 and more than 2 mu m, controlling the flow rate of the nickel-manganese mixed salt to be 400L/h-600L/h; when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 600L/h to 800L/h.
Further, steps S2 and S3 are performed in a reaction vessel having a long-diameter paddle.
Further, the diameter of the long-diameter blade/the diameter of the kettle is 0.50-0.65, and the stirring speed is 300-500 rpm.
Further, in step S1, the nickel salt is nickel sulfate, nickel chloride or nickel nitrate, and the manganese salt is manganese sulfate, manganese chloride or manganese nitrate.
Further, in step S1, the doping element is Al, Mg, Zr, Fe, Ti, or W.
Further, in step S2, the concentration of the ammonia solution is 13mol/L, and the alkali solution is 10mol/L sodium hydroxide solution.
Further, in steps S2 and S3, the ammonia concentration in the reaction base solution and the reaction solution is controlled to be 4g/L to 10 g/L.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a spherical high-nickel cobalt-free single crystal precursor, and the specific surface of the high-nickel cobalt-free single crystal precursor is 20-50 m2The half-peak width of the precursor is 0.8-1.8, which indicates that the crystallinity is low; the high-nickel cobalt-free single crystal precursor has good dispersibility, good sphericity, obviously refined primary crystal grains, lower preferred crystal orientation and larger specific surface, the structure is favorable for single crystallization and consistency of sintering, the direct-current impedance of the prepared cobalt-free anode material is obviously reduced, and the multiplying power and the cycle performance of a battery are effectively improved.
When the spherical high-nickel cobalt-free single crystal precursor provided by the invention is prepared, the low coprecipitation reaction temperature is 20-40 ℃, and the modes of increasing the feeding speed section by section and changing the pH value according to the median particle size of a reaction product are adopted, so that the crystallinity of the precursor is effectively reduced, the precursor ratio is improved, the single crystallization of sintering and the reduction of sintering cost are facilitated, the process is simple, the process is easy to control, and the preparation method is suitable for large-scale production.
In addition, the reaction kettle adopts the long-diameter blades, the diameter of the blades/the diameter of the kettle is 0.50-0.65, the stirring strength is improved, the dispersity and the sphericity of the single crystal precursor are improved, the consistency of the sintering process is facilitated, the DCR of the high-nickel cobalt-free single crystal product is further reduced, and the electrochemical performance of the high-nickel cobalt-free single crystal product is facilitated.
Drawings
FIG. 1 is a schematic diagram of a precursor prepared in example 1 of the present invention under a 5000-fold electron microscope;
FIG. 2 is a schematic diagram of the precursor prepared in comparative example 1 under a 5000-fold electron microscope;
FIG. 3 is a schematic view of a precursor prepared in example 1 of the present invention under a 50000 times electron microscope;
FIG. 4 is a schematic diagram of a precursor prepared in comparative example 1 under a 50000-fold electron microscope;
FIG. 5 is an XRD pattern of a precursor prepared in example 1 of the present invention;
fig. 6 is an XRD pattern of the precursor prepared in comparative example 1.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example 1
Step 3, starting the reaction, simultaneously adding the nickel-manganese mixed salt, the aluminum salt, the alkali liquor and the ammonia solution into a reaction kettle filled with reaction bottom liquid, and controlling the ammonia concentration to be 10g/L in the whole process; the pH value is controlled to be 13.0 in the early stage of the reaction, and when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m, the pH value in the reaction process is controlled to be 12.2;
specifically, when the median particle size is more than 0 and less than D50 and less than 1.5 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 200L/h, and the pH value in the reaction process is controlled to be 13.0; when the median particle size is more than or equal to 1.5 mu m and D50 is more than 2 mu m, controlling the flow of the nickel-manganese mixed salt to be 400L/h and the pH value to be 13.0; when the median particle diameter D50 is more than or equal to 2 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 600L/h, and the pH value is controlled to be 12.2.
And 4, stopping feeding when the particle size D50 is 3.5 mu m, filtering, washing, drying, screening and removing iron to obtain a precursor product Ni0.90Mn0.08Al0.02(OH)2。
The specific surface area of the precursor product is 22m2The scanning electron microscope scanning images of the,/g are shown in FIG. 1 and FIG. 3; XRD test results FWHM101 ═ 0.88, as shown in fig. 5.
Example 2
Step 3, starting the reaction, simultaneously adding the nickel-manganese mixed salt, the magnesium salt, the alkali liquor and the ammonia solution into a reaction kettle filled with reaction bottom liquid, and controlling the ammonia concentration to be 4g/L in the whole process; controlling the pH value to be 12.3 in the early stage of the reaction, and controlling the pH value to be 11.5 when the median particle diameter D50 is more than or equal to 2 mu m;
specifically, when the median particle size is more than 0 and less than D50 and less than 1.5 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 400L/h, and the pH value is controlled to be 12.3; when the median particle size is more than or equal to 1.5 mu m and D50 is more than 2 mu m, controlling the flow of the nickel-manganese mixed salt to be 600L/h and the pH value to be 12.3; when the median particle diameter D50 is more than or equal to 2 μm, the flow rate of the nickel-manganese mixed salt is controlled to be 800L/h, and the pH value is controlled to be 11.5.
And step 4, stopping feeding when the particle size D50 is 4.0 mu m, filtering, washing, drying, screening and removing iron to obtain a precursor product Ni0.60Mn0.35Mg0.05(OH)2。
The specific surface area of the precursor product is 25m2(ii)/g; XRD test results FWHM101=1.0。
Example 3
Step 3, starting the reaction, simultaneously adding the nickel-manganese mixed salt, the zirconium salt, the alkali liquor and the ammonia solution into a reaction kettle filled with reaction base liquid, and controlling the ammonia concentration to be 6g/L in the whole process; the pH value is controlled to be 12.5 in the early stage of the reaction, and when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m, the pH value is controlled to be 11.7;
specifically, when the median particle size is more than 0 and less than D50 and less than 1.5 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 300L/h, and the pH value is controlled to be 12.5; when the median particle size is more than or equal to D50 and more than 2 mu m, controlling the flow of the nickel-manganese mixed salt to be 500L/h and the pH value to be 12.3; when the median particle diameter D50 is more than or equal to 2 μm, the flow rate of the nickel-manganese mixed salt is controlled to be 700L/h, and the pH value is controlled to be 11.7.
And 4, stopping feeding when the particle size D50 is 2.5 mu m, filtering, washing, drying, screening and removing iron to obtain a precursor product Ni0.80Mn0.17Zr0.03(OH)2。
The specific surface area of the precursor product is 37m2(ii)/g; XRD test results FWHM101=0.13。
Example 4
Step 3, starting the reaction, simultaneously adding the nickel-manganese mixed salt, the magnesium salt, the alkali liquor and the ammonia solution into a reaction kettle filled with reaction bottom liquid, and controlling the ammonia concentration to be 4g/L in the whole process; controlling the pH value to be 12.3 in the early stage of the reaction, and controlling the pH value to be 11.5 when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m;
specifically, when the median particle size is more than 0 and less than D50 and less than 1.5 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 400L/h, and the pH value is controlled to be 12.3; when the median particle size is more than or equal to 1.5 mu m and D50 is more than 2 mu m, controlling the flow of the nickel-manganese mixed salt to be 600L/h and the pH value to be 12.3; when the median particle diameter D50 is more than or equal to 2 μm, the flow rate of the nickel-manganese mixed salt is controlled to be 800L/h, and the pH value is controlled to be 11.5.
And step 4, stopping feeding when the particle size D50 is 4.0 mu m, filtering, washing, drying, screening and removing iron to obtain a precursor product Ni0.9Mn0.05Mg0.05(OH)2。
The specific surface area of the precursor product is 20m2(ii)/g; XRD test results FWHM101=0.8。
Example 5
Step 3, starting the reaction, simultaneously adding the nickel-manganese mixed salt, the ferric salt, the alkali liquor and the ammonia solution into a reaction kettle filled with the reaction bottom liquid, and controlling the ammonia concentration to be 5g/L in the whole process; controlling the pH value to be 12.7 in the early stage of the reaction, and controlling the pH value to be 12.0 when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m;
specifically, when the median particle size is more than 0 and less than D50 and less than 1.5 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 250L/h, and the pH value is controlled to be 12.7; when the median particle size is more than or equal to 1.5 mu m and D50 is more than 2 mu m, controlling the flow of the nickel-manganese mixed salt to be 600L/h and the pH value to be 12.7; when the median particle diameter D50 is more than or equal to 2 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 800L/h, and the pH value is controlled to be 12.0.
And step 4, stopping feeding when the particle size D50 is 4.0 mu m, filtering, washing, drying, screening and removing iron to obtain a precursor product Ni0.9Mn0.05Fe0.05(OH)2。
The specific surface area of the precursor product is 50m2(ii)/g; XRD test results FWHM101=1.8。
The doping element can also be titanium sulfate and tungsten trioxide.
Example 6
And 2, adding the prepared alkali liquor and ammonia solution into a reaction kettle filled with semi-kettle water and filled with nitrogen, wherein the reaction kettle adopts a paddle with the paddle diameter/kettle diameter being 0.58, adjusting the pH value of the base liquor to be 12.8, adjusting the ammonia concentration to be 8g/L, controlling the stirring speed to be 350rpm and controlling the temperature to be 35 ℃.
Step 3, starting the reaction, simultaneously adding the nickel-manganese mixed salt, the alkali liquor and the ammonia solution into a reaction kettle filled with the reaction bottom liquor, and controlling the ammonia concentration to be 8g/L in the whole process; the pH value is controlled to be 12.4 in the early stage of the reaction, and when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m, the pH value is controlled to be 11.6;
specifically, when the median particle size is more than 0 and less than D50 and less than 1.5 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 350L/h, and the pH value is controlled to be 12.4; when the median particle size is more than or equal to 1.5 mu m and D50 is more than 2 mu m, controlling the flow of the nickel-manganese mixed salt to be 550L/h and the pH value to be 12.4; when the median particle diameter D50 is more than or equal to 2 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 750L/h, and the pH value is controlled to be 11.6.
And 4, stopping feeding when the particle size D50 is 3.0 mu m, filtering, washing, drying, screening and removing iron to obtain a precursor product Ni0.75Mn0.25(OH)2。
The specific surface area of the precursor product is 30m2(ii)/g; XRD test results FWHM101=0.94。
Comparative example 1
And 3, starting the reaction, simultaneously adding the nickel-manganese mixed salt, the aluminum salt, the alkali liquor and the ammonia solution into a reaction kettle filled with the reaction bottom liquid, controlling the ammonia concentration to be 10g/L, the pH value to be 12.2 and controlling the flow to be 400L/h in the whole process.
And 4, stopping feeding when the particle size of the reaction product is D50 ═ 3.5 microns, filtering, washing, drying, screening and deironing to obtain a precursor product Ni0.90Mn0.08Al0.02(OH)2。
The specific surface area of the precursor product is 10m2The scanning electron microscope scanning images of the,/g are shown in FIG. 2 and FIG. 4; XRD test results FWHM101 ═ 0.511, as shown in fig. 6.
In summary, according to the general batch processThe prepared precursor ratio is generally 15m2Within/g, FWHM101Generally less than 0.8, and the specific surface area of the precursor prepared by the embodiment 1-6 of the invention can reach 20m2/g~50m2Per g, the half-peak width of the precursor can reach 0.8-FWHM101The precursor prepared by the invention has the physicochemical indexes which are not more than 1.8, not only is beneficial to sintering single crystallization, but also effectively reduces the sintering temperature of single crystal, and is beneficial to improving the physicochemical property and the electrical property of a sintered product.
The cobalt-free precursor prepared in example 6 without adding doping elements had a specific surface area of 30m2/g,FWHM101The obtained precursor also has high ratio table and low material crystallinity, and improves the sphericity of the small-particle-size precursor; compared with an undoped cobalt-free precursor, in the embodiments 1 to 5, the doping elements are added into the precursor, and the doping elements can be uniformly distributed in the material in the sintering process, so that the crystal structure is further improved, and the effect of further optimizing the electrochemical performance of the material can be achieved.
As can be seen from comparison of the figures 1 to 4, the spherical high-nickel cobalt-free single crystal precursor prepared by the method has the advantages that the primary crystal grains are fine, loose and porous, the sphericity of the secondary particles is good, and the sintering temperature is favorably reduced and the sintering single crystallization is favorably realized; the precursor prepared by the conventional process has thicker primary crystal grains and compact accumulation, and is not beneficial to sintering and single crystallization.
Comparing the XRD patterns of FIG. 5 and FIG. 6, it can be seen that the FWHM of the full width at half maximum of the spherical high-nickel cobalt-free single crystal precursor prepared by the present invention101Compared with the precursor prepared by the conventional process, the semi-peak width of the precursor is wider, which shows that the non-crystallinity is better, the primary crystal grains are more uniformly distributed, and the uniform growth of the crystal grains in the sintering process is facilitated.
Claims (10)
1. The spherical high-nickel cobalt-free single crystal precursor is characterized in that the molecular formula of the spherical high-nickel cobalt-free single crystal precursor is NixMnyMz(OH)2Wherein x + y + z is 1, x is more than or equal to 0.6 and less than 1.0, z is more than or equal to 0 and less than or equal to 0.05, M is a doping element, and the specific surface area of the spherical high-nickel cobalt-free single crystal precursor is 20M2/g~50m2/g,The half-peak width is 0.8-1.80.
2. The method for preparing the spherical high-nickel cobalt-free single crystal precursor of claim 1, comprising the steps of:
s1 taking Ni: preparing a nickel-manganese mixed salt solution with the concentration of 1.0-2.0 mol/L from nickel salt and manganese salt of which the Mn is x, y;
s2, preparing a reaction base solution from the alkali solution and the ammonia solution, and adjusting the pH value of the reaction base solution to 12.5-13.0;
s3, introducing a nickel-manganese mixed salt solution, a doped element salt solution, an alkali solution and an ammonia solution into the reaction bottom solution at the same time for reaction, controlling the reaction temperature to be 20-40 ℃ in the reaction process, adjusting the pH value of the reaction solution and the feeding speed of the nickel-manganese mixed salt solution according to the median particle size of the reaction product, stopping feeding when the median particle size of the reaction product is 2.5-4.0 mu m, filtering, washing, drying, screening and removing iron to obtain the spherical high-nickel cobalt-free single crystal precursor.
3. The method according to claim 2, wherein in step S3, when the median particle size of the reaction product is 0 < D50 < 2 μm, the pH value of the reaction process is controlled to be 12.3-13.0; when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m, controlling the pH value in the reaction process to be 11.5-12.2.
4. The method according to claim 2, wherein in step S3, when the median particle diameter of the reaction product is 0 < D50 < 1.5 μm, the flow rate of the nickel-manganese mixed salt is controlled to be 200L/h to 400L/h; when the median particle size of the reaction product is more than or equal to 1.5 mu m and more than or equal to D50 and more than 2 mu m, controlling the flow rate of the nickel-manganese mixed salt to be 400L/h-600L/h; when the median particle diameter D50 of the reaction product is more than or equal to 2 mu m, the flow rate of the nickel-manganese mixed salt is controlled to be 600L/h to 800L/h.
5. The method of claim 2, wherein the steps S2 and S3 are performed in a reaction kettle having a long-diameter paddle.
6. The production method according to claim 5, wherein the long-diameter blade has a blade diameter/tank diameter of 0.50 to 0.65 and a stirring speed of 300 to 500 rpm.
7. The method according to claim 2, wherein in step S1, the nickel salt is nickel sulfate, nickel chloride or nickel nitrate, and the manganese salt is manganese sulfate, manganese chloride or manganese nitrate.
8. The method according to claim 2, wherein in step S1, the doping element is Al, Mg, Zr, Fe, Ti, or W.
9. The method according to claim 2, wherein the ammonia solution has a concentration of 13mol/L and the alkali solution is a 10mol/L sodium hydroxide solution in steps S2 and S3.
10. The method of claim 2, wherein the ammonia concentration in the reaction solution and the reaction base solution is controlled to be 4g/L to 10g/L in steps S2 and S3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110130581.0A CN112939095B (en) | 2021-01-29 | 2021-01-29 | Spherical high-nickel cobalt-free single crystal precursor and preparation method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110130581.0A CN112939095B (en) | 2021-01-29 | 2021-01-29 | Spherical high-nickel cobalt-free single crystal precursor and preparation method thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
CN112939095A true CN112939095A (en) | 2021-06-11 |
CN112939095B CN112939095B (en) | 2023-04-07 |
Family
ID=76240266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202110130581.0A Active CN112939095B (en) | 2021-01-29 | 2021-01-29 | Spherical high-nickel cobalt-free single crystal precursor and preparation method thereof |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN112939095B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113735189A (en) * | 2021-08-13 | 2021-12-03 | 荆门市格林美新材料有限公司 | Preparation method of Al and Zr doped cobalt-free precursor with high specific surface area |
CN113809294A (en) * | 2021-08-27 | 2021-12-17 | 西安理工大学 | Cobalt-free high-nickel ternary positive electrode material, preparation method and method for preparing battery positive electrode |
CN114031127A (en) * | 2021-12-20 | 2022-02-11 | 金驰能源材料有限公司 | Mg-Ti co-doped high-nickel cobalt-free precursor and preparation method thereof |
CN114162882A (en) * | 2021-12-09 | 2022-03-11 | 扬州虹途电子材料有限公司 | Nanometer cobalt-free single crystal anode material precursor and preparation method of cobalt-free single crystal anode material |
CN114335508A (en) * | 2021-12-28 | 2022-04-12 | 中伟新材料股份有限公司 | Single-crystal ternary cathode material, preparation method thereof and lithium ion battery |
CN114843458A (en) * | 2022-04-07 | 2022-08-02 | 青岛乾运高科新材料股份有限公司 | High-nickel single crystal cobalt-free anode material and preparation method thereof |
CN115676919A (en) * | 2022-12-28 | 2023-02-03 | 河南科隆电源材料有限公司 | Modified cobalt-free precursor material and preparation method thereof |
CN116102078A (en) * | 2022-11-11 | 2023-05-12 | 泾河新城陕煤技术研究院新能源材料有限公司 | Preparation method of high-tap sodium-electricity precursor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013201071A (en) * | 2012-03-26 | 2013-10-03 | Toshiba Corp | Battery electrode material, battery electrode material paste, dye-sensitized solar cell, and storage battery |
CN109970106A (en) * | 2019-03-28 | 2019-07-05 | 广东迈纳科技有限公司 | A kind of large-scale producing method of nickelic no cobalt precursor and positive electrode |
CN110265634A (en) * | 2019-05-09 | 2019-09-20 | 浙江美都海创锂电科技有限公司 | A kind of preparation method of the nickelic NCM anode material for lithium-ion batteries of monocrystalline |
CN112158889A (en) * | 2020-08-27 | 2021-01-01 | 荆门市格林美新材料有限公司 | Mass production method of single crystal cobalt-free lithium-rich manganese-based binary material precursor |
WO2021000868A1 (en) * | 2019-07-02 | 2021-01-07 | 湖南杉杉新能源有限公司 | W-containing high-nickel ternary positive electrode material and preparation method therefor |
-
2021
- 2021-01-29 CN CN202110130581.0A patent/CN112939095B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013201071A (en) * | 2012-03-26 | 2013-10-03 | Toshiba Corp | Battery electrode material, battery electrode material paste, dye-sensitized solar cell, and storage battery |
CN109970106A (en) * | 2019-03-28 | 2019-07-05 | 广东迈纳科技有限公司 | A kind of large-scale producing method of nickelic no cobalt precursor and positive electrode |
CN110265634A (en) * | 2019-05-09 | 2019-09-20 | 浙江美都海创锂电科技有限公司 | A kind of preparation method of the nickelic NCM anode material for lithium-ion batteries of monocrystalline |
WO2021000868A1 (en) * | 2019-07-02 | 2021-01-07 | 湖南杉杉新能源有限公司 | W-containing high-nickel ternary positive electrode material and preparation method therefor |
CN112158889A (en) * | 2020-08-27 | 2021-01-01 | 荆门市格林美新材料有限公司 | Mass production method of single crystal cobalt-free lithium-rich manganese-based binary material precursor |
Non-Patent Citations (3)
Title |
---|
张诚等: "NCM811前驱体制备过程中的影响因素研究", 《陕西煤炭》 * |
贾效旭等: "H622型镍钴锰酸锂前驱体工艺技术研究", 《科技创新导报》 * |
马荣骏等: "《萃取冶金》", 31 August 2009, 冶金工业出版社 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113735189A (en) * | 2021-08-13 | 2021-12-03 | 荆门市格林美新材料有限公司 | Preparation method of Al and Zr doped cobalt-free precursor with high specific surface area |
WO2023016427A1 (en) * | 2021-08-13 | 2023-02-16 | 荆门市格林美新材料有限公司 | Preparation method for al and zr doped cobalt-free precursor with high specific surface area |
CN113809294A (en) * | 2021-08-27 | 2021-12-17 | 西安理工大学 | Cobalt-free high-nickel ternary positive electrode material, preparation method and method for preparing battery positive electrode |
CN114162882A (en) * | 2021-12-09 | 2022-03-11 | 扬州虹途电子材料有限公司 | Nanometer cobalt-free single crystal anode material precursor and preparation method of cobalt-free single crystal anode material |
CN114031127A (en) * | 2021-12-20 | 2022-02-11 | 金驰能源材料有限公司 | Mg-Ti co-doped high-nickel cobalt-free precursor and preparation method thereof |
CN114031127B (en) * | 2021-12-20 | 2023-10-24 | 金驰能源材料有限公司 | Mg-Ti co-doped high-nickel cobalt-free precursor and preparation method thereof |
CN114335508A (en) * | 2021-12-28 | 2022-04-12 | 中伟新材料股份有限公司 | Single-crystal ternary cathode material, preparation method thereof and lithium ion battery |
CN114843458A (en) * | 2022-04-07 | 2022-08-02 | 青岛乾运高科新材料股份有限公司 | High-nickel single crystal cobalt-free anode material and preparation method thereof |
CN114843458B (en) * | 2022-04-07 | 2023-11-07 | 青岛乾运高科新材料股份有限公司 | High-nickel monocrystal cobalt-free positive electrode material and preparation method thereof |
CN116102078A (en) * | 2022-11-11 | 2023-05-12 | 泾河新城陕煤技术研究院新能源材料有限公司 | Preparation method of high-tap sodium-electricity precursor |
CN116102078B (en) * | 2022-11-11 | 2023-08-18 | 泾河新城陕煤技术研究院新能源材料有限公司 | Preparation method of high-tap sodium-electricity precursor |
CN115676919A (en) * | 2022-12-28 | 2023-02-03 | 河南科隆电源材料有限公司 | Modified cobalt-free precursor material and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
CN112939095B (en) | 2023-04-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN112939095B (en) | Spherical high-nickel cobalt-free single crystal precursor and preparation method thereof | |
CN113636606B (en) | Preparation method and application of nickel-rich cobalt-free single crystal cathode material of lithium ion battery | |
CN109455772B (en) | Modified precursor and anode material for lithium ion battery and preparation methods of precursor and anode material | |
CN113373517B (en) | High-nickel single crystal small-particle ternary precursor and continuous preparation method thereof | |
JP5754416B2 (en) | Method for producing nickel cobalt composite hydroxide | |
CN113363438B (en) | Preparation method of La and Ce co-doped NCMA quaternary precursor | |
CN108264096B (en) | Preparation method of high-density small-particle nickel-cobalt-manganese hydroxide | |
CN112811477A (en) | Method for controlling synthesis of single crystal ternary cathode material through precursor | |
CN107732232A (en) | A kind of preparation method of Hydrothermal Synthesiss nickel-cobalt lithium manganate cathode material | |
CN111977705A (en) | Preparation method of nickel-cobalt-manganese composite hydroxide | |
CN113651369A (en) | Spherical high-nickel ternary precursor material, preparation method thereof and high-nickel ternary cathode material | |
CN115385399A (en) | Nickel-cobalt-manganese ternary precursor and intermittent preparation process thereof | |
CN107265519A (en) | A kind of application for the method and its presoma for improving lithium ion cell positive gradient distributed material precursor synthesis particle size uniformity | |
CN113659129A (en) | Multi-element doped ternary precursor and preparation method thereof | |
CN114031127B (en) | Mg-Ti co-doped high-nickel cobalt-free precursor and preparation method thereof | |
CN114843458B (en) | High-nickel monocrystal cobalt-free positive electrode material and preparation method thereof | |
CN115092972B (en) | Cerium-tungsten co-doped ternary cathode material precursor and preparation method thereof | |
CN116354409A (en) | Ultrahigh BET high-nickel ternary precursor and continuous preparation method thereof | |
CN111717939B (en) | Narrowly distributed large-particle-size nickel-cobalt-aluminum hydroxide and preparation method thereof | |
JP5967264B2 (en) | Method for producing positive electrode active material for non-aqueous electrolyte secondary battery | |
JP7219756B2 (en) | Uniform introduction of titanium into solid materials | |
CN108232185B (en) | Synthetic method of liquid-phase doped ternary precursor | |
CN115092974B (en) | Doped ternary precursor, preparation method thereof, ternary positive electrode material and lithium ion battery | |
CN115261987B (en) | Large monocrystal nickel cobalt manganese positive electrode material and preparation method thereof | |
CN216856734U (en) | Device for efficiently preparing precursor of ternary cathode material |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |