CN114380342A - Preparation method of ternary cathode material - Google Patents
Preparation method of ternary cathode material Download PDFInfo
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- CN114380342A CN114380342A CN202111645878.7A CN202111645878A CN114380342A CN 114380342 A CN114380342 A CN 114380342A CN 202111645878 A CN202111645878 A CN 202111645878A CN 114380342 A CN114380342 A CN 114380342A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/50—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese of the type [MnO2]n-, e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
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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
- 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
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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
- 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
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
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- 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
Abstract
The invention relates to a preparation method of a ternary cathode material, which comprises the steps of mixing a precursor and spraying a grinding medium into a high-speed mixer to mix and dry the mixture; recycling the dried and recycled gas into a grinding medium tank through condensation and filtration equipment; sintering the dried precursor at high temperature to obtain a ternary cathode material; mixing the ternary positive electrode material with LiX and Li2Mixing and drying at least one coating raw material in a mixture of O and LiX and a mixture of LiX and LiOH to obtain a coating raw material; calcining the coated raw material to obtain Li2OHX cladding high nickel ternary material. The invention firstly proposes that the ternary anode material raw material is prepared by mixing high boiling point organic system solution as a medium, and the grinding medium is added in a mode of atomization sprayingMixing material and organic system recycling system, and Li2OHX the ternary material with high nickel content is coated to improve the first effect and cycle performance of the battery from the point of lithium source supplement without reducing the gram capacity of the material.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a ternary cathode material.
Background
At present, lithium ion batteries have gradually become the mainstream products of secondary batteries, and compared with nickel-cadmium and lead-acid batteries, the lithium ion batteries have the advantages of high specific capacity, good cycle performance and small environmental pollution, and better meet the requirements of people on energy miniaturization in daily life and the idea of clean energy batteries. Therefore, the lithium ion battery is gradually switched from small household appliances for daily use to large-scale power utilization fields such as energy storage and automobiles.
The positive electrode material is an important component of the lithium ion battery, and the performance of the positive electrode material directly determines the performance of the lithium ion battery. The lithium ion battery which is commercialized at the earliest is a lithium cobaltate battery, but because the cobalt resource is scarce, belongs to a strategic reserve resource, is high in price, and is gradually replaced by other more advantageous anode materials. The common cathode materials in daily life are mainly lithium iron phosphate cathode material (LiFePO4) and nickel cobalt manganese ternary material (LixNiyCozMn (1-y-z) O2). The lithium iron phosphate material has an olivine structure, is low in cost, has a theoretical gram capacity of 173mAh/g, has a gram capacity of about 160mAh/g of an actual commercial material, has a platform voltage of 3.2V, and is good in safety. However, due to the characteristics of the spinel structure, the ion insertion and extraction channel is a one-dimensional channel, which results in poor low-temperature rate performance, and meanwhile, due to the fact that the specific energy ceiling is low and the platform voltage is low, the channel is slightly inferior to the channel in some fields (such as electric vehicles) with high contrast energy requirements. While ternary materials are characterized by high specific energy. At present, the specific energy of the commercialized ternary material reaches more than 200mAh/g, the ternary battery materials with different capacities and different performances are manufactured by different proportions of Ni, Co and Mn, and the common proportions are 111, 424, 523, 622 and 811. With the development of synthesis technology, low-cobalt or even cobalt-free ternary materials and single crystal ternary materials appear, so that materials with more outstanding performance and lower cost are obtained, and meanwhile, the stability of the battery materials is improved by different doping methods.
The conventional method for synthesizing the ternary cathode material of the lithium battery is to mix a lithium source, a nickel source, a manganese source, a cobalt source and other doping elements in a certain proportion, perform ball-milling mixing by adopting a dry method or using water, ethanol and acetone as mixing media, then dry the mixture to serve as a precursor, and perform high-temperature calcination once to twice to obtain the ternary cathode material of the lithium battery. Dry mixing has a low mixing uniformity, and particularly causes the uniformity problem of doping elements. When water is used as a medium, the drying difficulty of water is high, the drying time and cost are increased, when ethanol and acetone are used as media, explosion steam can be formed with air due to high volatility, the explosion risk exists, and particularly, as the content of nickel is increased, oxidizing gas needs to be filled into a sintering furnace, so that the explosion risk is further increased.
In addition, when the content of nickel element in the ternary material is increased, the unit mass capacity of the material is synchronously improved. Therefore, in order to improve the endurance mileage of the electric automobile, the high nickel ternary material is generally considered as the first choice of the positive electrode material in the power battery. However, the cycle life of high nickel ternary materials decreases with increasing Ni content. The life of an electric vehicle battery system using a high nickel ternary material will also decrease. In order to increase the cycle life of the material, oxide coating is usually used, such as Al2O3，ZrO，MnO2MgO, etc.
The prior art discloses a preparation method of a spherical lithium nickel cobalt composite oxide anode material, which comprises the steps of carrying out wet grinding on lithium, nickel, cobalt and doping elements, then carrying out spray drying to obtain a precursor with good sphericity, and sintering under an oxygen atmosphere to obtain the spherical lithium nickel cobalt composite oxide anode material, wherein the chemical composition of the anode material conforms to a general formula LixNi1-y-zCoyMzO2In the formula: m is selected from at least one of Al, Mg and Mn, x is more than or equal to 1.0 and less than or equal to 1.1, y is more than or equal to 0.1 and less than or equal to 0.4, and z is more than or equal to 0 and less than or equal to 0.3. The precursor is prepared by using pure water, ethanol or acetone as a grinding medium, and Al, Mg and Mn are adopted as coating layers.
The prior art also discloses a preparation method of the alumina composite nickel cobalt lithium manganate ternary material, which comprises the following steps: preparing a solution A; preparing a solution B; installing and configuring a reaction flask; adding the solution A, B into a reaction flask to participate in mixing reaction; preparing a solution C, and adding the solution C into a flask for reaction; carrying out suction filtration, washing and drying to obtain a precursor; and mixing and calcining the precursor and a lithium source to prepare the aluminum oxide composite nickel cobalt lithium manganate ternary cathode material. The method adopts ethanol or acetone as a mixed medium to prepare the anode material, and the coating material is aluminum oxide.
The prior art also discloses a preparation method of the lithium ion battery anode material wet-process coated aluminum, which comprises the following steps: preparing a precursor and preparing slurry with a certain solid content; dripping an isopropanol solution dissolved with aluminum isopropoxide in advance into the precursor slurry at a certain speed, and controlling proper dripping speed, temperature and stirring speed; after the dropwise adding is finished, aging for a certain time, filtering, washing and drying to obtain an aluminum-coated nickel-cobalt-manganese precursor; and uniformly mixing the precursor coated with the aluminum and the lithium salt, carrying out high-temperature treatment for a certain time, cooling and crushing to obtain the lithium ion battery anode material coated with the aluminum isopropoxide by the wet method. The wet mixing of the invention adopts a water medium as a medium, and the coating layer is Al.
However, the above oxide materials are not electrochemically active materials, and their mass capacity is also reduced when the cycle life of the high nickel ternary material is increased.
Disclosure of Invention
The invention aims to provide a preparation method of a ternary cathode material for the first time, so as to solve the problem of prolonging the cycle life of a battery while maintaining the energy density of the battery. The method can enable the anode material to release more lithium ions in the charging and discharging process, and improve the lithium ion concentration of the battery system, thereby realizing the purpose of prolonging the cycle life of the battery.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a ternary cathode material comprises the following steps:
A. putting the precursor into a high-speed mixer, and spraying a grinding medium in a grinding medium tank into the high-speed mixer by using a spray atomizing device while mixing the materials, wherein the grinding medium is one of n-nonane, isononane and liquid paraffin solution; the precursor comprises a lithium source, a nickel source, a manganese source or a cobalt source;
B. drying the mixed material after the material mixing is finished;
C. recycling the dried and recycled gas into the grinding medium tank through condensation and filtering equipment, and reusing the gas as a grinding medium;
D. sintering the dried precursor at high temperature to obtain a ternary cathode material;
E. d, mixing the ternary cathode material prepared in the step D with LiX and Li2Mixing one or more coating raw materials of a mixture of O and LiX and a mixture of LiX and LiOH in a grinding medium, wherein X is halogen, and the grinding medium is one of n-nonane, isononane and liquid paraffin; drying after mixing to obtain a coating raw material;
F. e, placing the coating raw material in the step E into a kiln for calcination, and obtaining Li after sintering2OHX cladding high nickel ternary material.
Further, step a, the lithium source comprises acetate, sulfate, nitrate, carbonate and lithium chloride or lithium hydroxide of lithium.
Further, in the step A, the nickel source, the manganese source and the cobalt source are one or more of sulfates, nitrates, carbonates, acetates, hydroxides, chlorides and oxides of nickel, manganese or cobalt elements and oxidized copolymers of two or three elements.
Further, in the step A, the volume of the grinding medium is 0.3-0.6 times of that of the precursor.
And further, in the step B, the drying temperature is 100-130 ℃, and the drying time is 5-30 min.
Further, in the step D, the sintering temperature is 650-850 ℃.
Further, step E, the Li2The molar ratio of O to LiX is 1:2, the molar ratio of LiX to LiOH is 1: 1, X is Cl, Br or I.
Further, in the step E, the mole number of the coating raw material is 0.1-5% of that of the high-nickel ternary material.
And step E, drying at 100-130 ℃ for 5-30 min.
And further, in the step F, the calcining temperature is 250-400 ℃, and the time is 5-10 hours.
Compared with the prior art, the invention has the beneficial effects that:
the invention firstly provides a ternary anode material raw material prepared by mixing high boiling point organic system solution as a medium, provides a grinding medium added in a mode of atomization spraying, provides a mixed material and organic system recycling system, and provides a new coating scheme, and uses Li2OHX (halogen element such as Cl, Br, I, etc.) coats the high nickel ternary material, and improves the first effect and cycle performance of the battery from the point of lithium source supplement without reducing the gram capacity of the material. In particular, the following advantages are provided:
1. the invention uses n-nonane, isononane and liquid paraffin as wet mixing medium, and proposes to use Li with anti-perovskite crystal structure2OHX (halogen element such as X ═ Cl, Br, I) material as coating layer on the surface of high nickel ternary material particle to form a LixNiyCozMn(1-y-z)O2@Li2OHX (halogen elements such as X ═ Cl, Br, and I);
2. compared with water, the n-nonane, the isononane and the liquid paraffin as the mixed medium have the characteristic of easy drying, no solvent residue is left during calcination, so that the calcined material is not influenced by the water, and meanwhile, compared with ethanol and acetone, the material has lower explosiveness and is safer; meanwhile, in the process of mixing the materials, the mixing medium is added in a spray atomization mode and is uniformly contacted with all the materials, so that the most uniform mixing system is formed by the least media; a condensation reflux process is used during drying, 100% closed-loop reflux can be realized, and the process cost is greatly saved;
3、Li2OHX has high ionic conductivity and Li at charging+The corresponding oxidation potential is lower during the extraction, the lithium ion extraction concentration is high, and the like; when the coated high nickel material is used for first charging, the positive electrode material can provide additional lithium ions to a battery system; these extra lithium ions will be used to form an SEI film (solid-liquid interface film) on the surface of the negative electrode and replenish lithium ions lost due to the passivation layer generated on the positive and negative electrode surfaces during subsequent charge and discharge cycles; therefore, the coating scheme provided by the invention can greatly prolong the cycle service life of the battery system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a charge and discharge curve of the battery material in example 1 of the present invention.
Detailed Description
The invention is further illustrated by the following examples:
the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The preparation method of the ternary cathode material comprises the following steps:
1. weighing the precursor according to the material design proportion, wherein the precursor comprises a lithium source, a nickel source, a manganese source or a cobalt source.
The lithium source includes lithium acetate, sulfate, nitrate, carbonate, and lithium chloride or lithium hydroxide.
The nickel source, the manganese source and the cobalt source can be one or more of sulfates, nitrates, carbonates, acetates, hydroxides, chlorides and oxides of nickel, manganese or cobalt elements and oxidized copolymers of two or three elements;
2. and (3) putting the precursor into a high-speed mixer to start mixing, and spraying the grinding medium in the grinding medium tank into the high-speed mixer by using a spray atomizing device while mixing.
The grinding medium is one of n-nonane, isononane and liquid paraffin solution, and the volume of the grinding medium is 0.3-0.6 times of the volume of all precursors;
3. and after the material mixing is finished, drying the mixed material at the temperature of 100-130 ℃ for 5-30 min.
4. And the dried and recovered gas is recovered into the grinding medium tank through condensation and filtering equipment and is reused as the grinding medium again.
5. And sintering the dried precursor at a high temperature of 650-850 ℃ to obtain the required ternary cathode material.
6. The synthesized ternary cathode material and LiX are mixed in a molar ratio of 1:2 Li2O and LiX in a molar ratio of 1: 1 (X is Cl, Br, I) or a mixture of LiX and LiOH.
The coating raw materials are weighed according to the designed proportion and mixed in a grinding medium, wherein the grinding medium is one of n-nonane, isononane and liquid paraffin.
The mole number of the coating raw material is 0.1-5% of that of the high-nickel ternary material.
And drying at 100-130 ℃ for 5-30 min after mixing to obtain the coating raw material.
7. Putting the coating raw material into a kiln, calcining for 5-10 hours at 250-400 ℃, and sintering to obtain Li2OHX (X ═ Cl, Br, I) coated with a high nickel ternary material.
The invention uses n-nonane, isononane and liquid paraffin as wet mixing media, and the n-nonane, isononane and liquid paraffin as mixing media have the characteristic of easy drying compared with water, and no solvent residue is left during calcination, so that the material during calcination is not influenced by water.
Meanwhile, compared with ethanol and acetone, the explosive property is lower, and the explosive effect is safer.
In the process of mixing the materials, the mixing medium is added in a spray atomization mode and is uniformly contacted with all the materials, so that the most uniform mixing system is formed by the least media.
And a condensation reflux process is used during drying, so that 100% closed-loop reflux can be realized, the process cost is greatly saved, and the environmental pollution is reduced.
Li2OHX (halogen element such as X ═ Cl, Br, I) substance, which is characterized by the chemical formula of the coated anode material: LixNiyCozMn (1-y-z) O2@Li2OHX (halogen elements such as X ═ Cl, Br, I). The coating layer can improve the first effect of the material, and can generate gas to be discharged from the interior of the battery cell in the formation stage, so that the capacity density of the material can not be reduced.
Example 1
10.5kg of lithium hydroxide and nickel-cobalt-manganese oxide with the ratio of nickel, cobalt and manganese being 80:10:10 are put into a high-speed mixer, and the molar ratio of the lithium hydroxide to the nickel-cobalt-manganese oxide is 1.05: 1.
And spraying grinding medium n-nonane into a grinding medium tank in a spray atomization mode to mix, wherein the spraying speed is 1.8g/min, and when the total amount of sprayed liquid reaches half of the total amount of solid, stopping spraying.
And (4) continuously stirring, drying at 120 ℃ after the total mixing time reaches 25min, condensing the evaporated solvent through a condenser, and refluxing into a grinding medium tank for repeated spraying.
After the material is dried for 15min, the material is sintered at 750 ℃ under the oxygen content for 12h, and the sintered material is crushed to obtain the required anode material.
Then, the material and 17.7g of LiCl material were uniformly mixed by the same wet method, dried and calcined at 250 ℃ for 10 hours to obtain [email protected]2An OHCl material.
After the graphite cathode is used for manufacturing the full-cell, the uncoated material 0.2C has the first charging specific capacity of 223.13mAh/g, the first discharging specific capacity of 202.25mAh/g and the first discharging efficiency of 90 percent.
The charging specific capacity of the coated material is 222.15mAh/g, the discharging specific capacity is 209.67mAh/g, the first discharging efficiency is 94.4 percent, and the first discharging efficiency is improved by 4.4 percent.
Example 2
5.3kg of lithium hydroxide and nickel-cobalt-manganese oxide with the nickel-cobalt-manganese ratio of 70:20:10 are put into a high-speed mixer, and the molar ratio of the lithium hydroxide to the nickel-cobalt-manganese oxide is 1.2: 1.
Spraying the grinding medium liquid paraffin into a grinding medium tank in a spray atomization mode for mixing, wherein the spraying speed is 0.9g/min, and stopping spraying when the total amount of sprayed liquid reaches 0.3 times of the total amount of solid.
And continuously stirring, drying at 130 ℃ after the total mixing time reaches 30min, condensing the evaporated solvent through a condenser, and refluxing into a grinding medium tank for repeated spraying.
After the material is dried for 15min, the material is sintered at 800 ℃ under the oxygen content for 12h, and the sintered material is crushed to obtain the required anode material.
Thereafter, the material was mixed with 540.75g of LiBr and Li in a molar ratio of 1:22O and LiBr mixture (nLiBr: nLi)2Mixing O and LiBr mixture (2: 1), wet mixing, oven drying, and calcining at 400 deg.C for 5 hr to obtain [email protected]2An OHCl material.
After the graphite cathode is used for manufacturing the full-cell, the uncoated material is 0.2C, the first charging specific capacity is 212.04mAh/g, the first discharging specific capacity is 191.35mAh/g, and the first discharging efficiency is 90.2%.
The charging specific capacity of the coated material is 213.11mAh/g, the discharging specific capacity is 200.54mAh/g, the first discharging efficiency is 94.1 percent, and the first discharging efficiency is improved by 3.9 percent.
As shown in fig. 1, the discharge capacity of the material with the coating added is higher than that of the material without coating. The invention uses n-nonane, isononane and liquid paraffin as wet mixing media, and proposes to use Li2OHX (halogen elements such as X ═ Cl, Br, I and the like) material with an anti-perovskite crystal structure as a coating layer on the surface of high-nickel ternary material particles to form LixNiyCozMn (1-y-z) O2@Li2OHX (halogen elements such as X ═ Cl, Br, and I). Compared with water, the n-nonane, the isononane and the liquid paraffin as the mixed medium have the characteristic of easy drying, no solvent residue is left during calcination, so that the material during calcination cannot be influenced by water, and meanwhile, compared with ethanol and acetone, the material is lower in explosiveness and safer. In the process of mixing the materials, the mixing medium is added in a spray atomization mode and is uniformly contacted with all the materials, so that the most uniform mixing system is formed by the least media. And a condensation reflux process is used during drying, so that 100% closed-loop reflux can be realized, and the process cost is greatly saved. Li2OHX has the advantages of high ionic conductivity, low oxidation potential corresponding to Li + extraction during charging, high lithium ion extraction concentration, etc.; when the coated high nickel material is used for first charging, the positive electrode material can provide additional lithium ions to a battery system; these extra lithium ions will be used to form an SEI film (solid-liquid interface film) on the surface of the negative electrode and replenish lithium ions lost as a passivation layer generated on the surface of the positive and negative electrodes during subsequent charge and discharge cycles. Therefore, the coating scheme provided by the invention can greatly prolong the cycle service life of the battery system.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The preparation method of the ternary cathode material is characterized by comprising the following steps of:
A. putting the precursor into a high-speed mixer, and spraying a grinding medium in a grinding medium tank into the high-speed mixer by using a spray atomizing device while mixing the materials, wherein the grinding medium is one of n-nonane, isononane and liquid paraffin solution; the precursor comprises a lithium source, a nickel source, a manganese source or a cobalt source;
B. drying the mixed material after the material mixing is finished;
C. recycling the dried and recycled gas into the grinding medium tank through condensation and filtering equipment, and reusing the gas as a grinding medium;
D. sintering the dried precursor at high temperature to obtain a ternary cathode material;
E. d, mixing the ternary cathode material prepared in the step D with LiX and Li2Mixing one or more coating raw materials of a mixture of O and LiX and a mixture of LiX and LiOH in a grinding medium, wherein X is halogen, and the grinding medium is one of n-nonane, isononane and liquid paraffin; drying after mixing to obtain a coating raw material;
F. e, placing the coating raw material in the step E into a kiln for calcination, and obtaining Li after sintering2OHX cladding high nickel ternary material.
2. The method for preparing a ternary cathode material according to claim 1, wherein: step A, the lithium source comprises acetate, sulfate, nitrate and carbonate of lithium and lithium chloride or lithium hydroxide.
3. The method for preparing a ternary cathode material according to claim 1, wherein: step A, the nickel source, the manganese source and the cobalt source are one or more of sulfates, nitrates, carbonates, acetates, hydroxides, chlorides and oxides of nickel, manganese or cobalt elements and oxidized copolymers of two or three elements.
4. The method for preparing a ternary cathode material according to claim 1, wherein: and step A, the volume of the grinding medium is 0.3-0.6 time of that of the precursor.
5. The method for preparing a ternary cathode material according to claim 1, wherein: and step B, drying at the temperature of 100-130 ℃ for 5-30 min.
6. The method for preparing a ternary cathode material according to claim 1, wherein: and D, sintering at 650-850 ℃.
7. The method for preparing a ternary cathode material according to claim 1, wherein: step E, the Li2The molar ratio of O to LiX is 1:2, the molar ratio of LiX to LiOH is 1: 1, X is Cl, Br or I.
8. The method for preparing a ternary cathode material according to claim 1, wherein: and E, the mole number of the coating raw material is 0.1-5% of that of the high-nickel ternary material.
9. The method for preparing a ternary cathode material according to claim 1, wherein: and E, drying at 100-130 ℃ for 5-30 min.
10. The method for preparing a ternary cathode material according to claim 1, wherein: and F, calcining at the temperature of 250-400 ℃ for 5-10 hours.
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| CN115974171A (en) * | 2022-09-29 | 2023-04-18 | 宁夏汉尧富锂科技有限责任公司 | Cathode material prepared by wet lithium-poor process and preparation method thereof |
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