CN114709411A - Multi-element positive electrode material and preparation method thereof - Google Patents
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000007774 positive electrode material Substances 0.000 title claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 21
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 21
- 239000002243 precursor Substances 0.000 claims abstract description 17
- 239000010405 anode material Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000002244 precipitate Substances 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 11
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 11
- 238000001556 precipitation Methods 0.000 claims abstract description 11
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005245 sintering Methods 0.000 claims abstract description 10
- -1 transition metal salt Chemical class 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 8
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract 2
- 239000000243 solution Substances 0.000 claims description 57
- 239000010406 cathode material Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 7
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- 229910021645 metal ion Inorganic materials 0.000 claims description 5
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 5
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 229910021380 Manganese Chloride Inorganic materials 0.000 claims description 4
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 claims description 4
- 150000002696 manganese Chemical class 0.000 claims description 4
- 239000011565 manganese chloride Substances 0.000 claims description 4
- 235000002867 manganese chloride Nutrition 0.000 claims description 4
- 229940099607 manganese chloride Drugs 0.000 claims description 4
- 150000002815 nickel Chemical class 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 2
- 229940099596 manganese sulfate Drugs 0.000 claims description 2
- 239000011702 manganese sulphate Substances 0.000 claims description 2
- 235000007079 manganese sulphate Nutrition 0.000 claims description 2
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 2
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 2
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 2
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 3
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 3
- 239000000047 product Substances 0.000 abstract description 2
- 239000012299 nitrogen atmosphere Substances 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 235000002639 sodium chloride Nutrition 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229940053662 nickel sulfate Drugs 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000643 oven drying Methods 0.000 description 3
- 239000012266 salt solution Substances 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- 229940010048 aluminum sulfate Drugs 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229940044175 cobalt sulfate Drugs 0.000 description 2
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- VQEHIYWBGOJJDM-UHFFFAOYSA-H lanthanum(3+);trisulfate Chemical compound [La+3].[La+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O VQEHIYWBGOJJDM-UHFFFAOYSA-H 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 229960003390 magnesium sulfate Drugs 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 description 1
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Classifications
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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
-
- 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
Abstract
The invention belongs to the technical field of lithium ion battery anode materials, and particularly relates to a preparation method of a multi-element anode material, which comprises the following steps: (1) in a reaction kettle in nitrogen atmosphere, deionized water is used as a base solution; (2) a solution formed by mixing transition metal salt, a sodium hydroxide solution and an ammonia water solution flows into a reaction kettle; (3) adjusting the pH value at 35-75 ℃ at 300-1200 r/min, carrying out precipitation reaction on a solution formed by mixing transition metal salts, a sodium hydroxide solution and an ammonia water solution, standing and separating to obtain a precipitate, washing the precipitate, and drying in an oven to obtain a multi-element precursor hydroxide; (4) and uniformly mixing the multi-element precursor hydroxide with a lithium source, and sintering to obtain the multi-element anode material. Simple process, easy control of reaction, suitability for commercialization and wide market prospect. The multi-element anode material product prepared by the invention has the advantages of low cost, good consistency, excellent electrical property and more stability.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery anode materials, and particularly relates to a multi-element anode material and a preparation method thereof.
Background
The positive electrode material in the lithium ion battery mainly has two functions:
electrochemical performance, i.e., safety and cycle life;
(II) cost constitution, i.e., the economic indicator. Compared with other battery materials, the positive electrode material is one of the main parts of the battery cost, so the research of the positive electrode material has become the current research hotspot, in particular to the positive electrode material of the power battery. However, cobalt in the power material is relatively high in price and large in price fluctuation, cannot meet the requirement of low cost of enterprises, and hardly brings price benefit to customers, and meanwhile, due to the high electrochemical performance requirement of the power battery, particularly in high-temperature storage and high voltage, the dissolution of transition metal elements, the mixed arrangement of lithium and nickel and the transformation of a surface layered structure to rock salt phase can occur, so that the capacity and voltage are attenuated, the surface oxygen is separated out under the condition of high voltage, and the oxidative decomposition of the electrolyte can be caused as a result.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the preparation method of the multielement anode material, which can improve the structural stability of the anode material, reduce the production cost, improve the high-temperature cycle performance and the high-voltage performance, has simple process flow and easy control of reaction.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a multi-element cathode material comprises the following steps:
(1) in a reaction kettle filled with nitrogen protection, deionized water is used as a base solution;
(2) continuously flowing a solution formed by mixing transition metal salts with different molar ratios, a sodium hydroxide solution and an ammonia water solution into a reaction kettle;
(3) under the conditions that the temperature is 35-75 ℃ and the stirring speed is 300-1200 r/min, the pH is adjusted by using an ammonia water solution, a solution formed by mixing transition metal salts with different molar ratios, a sodium hydroxide solution and the ammonia water solution are subjected to precipitation reaction, feed liquid of the precipitation reaction is subjected to standing separation to obtain a precipitate, and the precipitate is washed and dried by an oven to obtain a multi-element precursor hydroxide;
(4) and uniformly mixing the multi-element precursor hydroxide with a lithium source, and sintering to obtain the multi-element anode material.
Preferably, in the step (2), the solution formed by mixing the transition metal salts comprises nickel salt and manganese salt, wherein the nickel salt is one or more of nickel sulfate, nickel chloride and nickel nitrate, and the manganese salt is one or more of manganese sulfate, manganese chloride and manganese nitrate.
Preferably, in the step (3), the pH is adjusted by using an ammonia water solution, and the pH is controlled to be 9.5-13.0.
Preferably, the molar concentration of metal ions in the solution formed by mixing the transition metal salts is 1.0-3.5 mol/L.
Preferably, the concentration of the sodium hydroxide solution is 15-35%, and the concentration of the ammonia water solution is 10-28%.
Preferably, in the step (3), the feed liquid of the precipitation reaction is subjected to standing separation and is washed by a centrifuge, and the pH value of the washed deionized water is controlled to be 7.00-9.50.
Preferably, in the step (3), the temperature of the oven is set to be 80-130 ℃ when the oven is dried.
Preferably, in the step (4), the molar ratio of the multi-element precursor hydroxide to a lithium source is 1.03 to 1.20, and the lithium source is one or more than two of lithium nitrate, lithium carbonate or lithium hydroxide.
Preferably, in the step (4), the sintering temperature is 700-1100 ℃, the sintering time is 6-24 hours, and the median particle size of the multi-element cathode material is 3.0-15.0 μm.
Based on a general inventive concept, another object of the present invention is to provide a multi-element cathode material prepared by the above preparation method.
Compared with the prior art, the method reduces the phase change of the surface of the anode material and the precipitation of surface oxygen by multi-element doping, thereby improving the stability of the structure of the surface of the material and reducing the side reaction with electrolyte, and simultaneously, elements can be mixed from the atomic level by a liquid phase doping mode, thereby optimizing the stability and consistency of the structure of the material and achieving the purposes of reducing production procedures and reducing production cost; simple process, easy control of reaction, suitability for commercialization and wide market prospect. The multi-element anode material product prepared by the invention has the advantages of low cost, good consistency, excellent electrical property and more stability.
Drawings
Fig. 1 is a cycle curve of a multi-element cathode material prepared in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to examples. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is only illustrative of the present invention and is not to be construed as limiting the present invention.
As used herein, the terms "comprises," "comprising," "includes," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of values, with a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
Example 1
A preparation method of a multi-element cathode material comprises the following steps:
(1) in a reaction kettle filled with nitrogen protection, deionized water is used as a base solution;
(2) marking the mixed salt solution of nickel sulfate, cobalt sulfate, manganese chloride, aluminum sulfate and magnesium sulfate with the molar ratio of 0.8: 0.05: 0.1: 0.045: 0.005 as solution A; controlling the molar concentration of metal ions in the solution A to be 1.6mol/L, and continuously flowing the solution A, a 25% sodium hydroxide solution and a 19% ammonia water solution into a reaction kettle according to a conventional flow ratio;
(3) adjusting pH with ammonia water solution at 55 deg.C and stirring speed of 750r/min, controlling pH to 12.5, allowing solution A to have precipitation reaction with sodium hydroxide solution and ammonia water solution, standing for separating the feed liquid to obtain precipitate, washing the precipitate, and oven drying to obtain Ni0.80Co0.05Mn0.10Al0.045Mg0.005(OH)2A precursor, marked as precursor B;
wherein, deionized water is used for washing until the pH of effluent is 7.82, and the temperature of the oven is set to be 102 ℃;
(4) and uniformly mixing the precursor B and lithium nitrate according to the molar ratio of 1: 1.02, and then sintering at the high temperature of 790 ℃ for 17 hours to obtain the multi-element anode material with the median particle size of 5.0 microns.
Example 2
A preparation method of a multi-element cathode material comprises the following steps:
(1) in a reaction kettle filled with nitrogen protection, deionized water is used as a base solution;
(2) recording a mixed salt solution of nickel sulfate, manganese chloride, aluminum sulfate and lanthanum sulfate with the molar ratio of 0.8: 0.15: 0.04: 0.01 as a solution A; controlling the molar concentration of metal ions in the solution A to be 2.0mol/L, and continuously flowing the solution A, a sodium hydroxide solution with the concentration of 15% and an ammonia water solution with the concentration of 28% into a reaction kettle according to a conventional flow ratio;
(3) adjusting pH with ammonia water solution at 45 deg.C and stirring speed of 850r/min, controlling pH to 11.5, allowing solution A to have precipitation reaction with sodium hydroxide solution and ammonia water solution, standing for separating the feed liquid to obtain precipitate, washing the precipitate, and oven drying to obtain Ni0.80Co0.05Mn0.10Al0.045Mg0.005(OH)2A precursor, marked as precursor B;
wherein, deionized water is used for washing until the pH value of effluent is 8.35, and the temperature of an oven is set to be 110 ℃;
(4) and uniformly mixing the precursor B and lithium nitrate according to the molar ratio of 1: 1.05, and then sintering at 820 ℃ for 16 hours to obtain the multi-element anode material with the median particle size of 9.5 microns.
Example 3
A preparation method of a multi-element cathode material comprises the following steps:
(1) in a reaction kettle filled with nitrogen protection, deionized water is used as a base solution;
(2) marking a mixed salt solution of nickel sulfate, cobalt sulfate, zirconium sulfate and lanthanum sulfate with the molar ratio of 0.85: 0.10: 0.04: 0.01 as a solution A; controlling the molar concentration of metal ions in the solution A to be 1.5mol/L, and continuously flowing the solution A, a 30% sodium hydroxide solution and a 12% ammonia water solution into a reaction kettle according to a conventional flow ratio;
(3) adjusting pH with ammonia water solution at 45 deg.C and stirring speed of 850r/min, controlling pH to 11.5, allowing solution A to have precipitation reaction with sodium hydroxide solution and ammonia water solution, standing for separating the feed liquid to obtain precipitate, washing the precipitate, and oven drying to obtain Ni0.80Co0.05Mn0.10Al0.045Mg0.005(OH)2A precursor, marked as precursor B;
wherein, deionized water is used for washing until the pH value of effluent is 8.35, and the temperature of an oven is set to be 110 ℃;
(4) and uniformly mixing the precursor B and lithium nitrate according to the molar ratio of 1: 1.05, and then sintering at 820 ℃ for 16 hours to obtain the multi-element anode material with the median particle size of 9.5 microns.
The above embodiments are merely preferred embodiments of the present invention, and any simple modification, modification and substitution changes made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. The preparation method of the multi-element cathode material is characterized by comprising the following steps of:
(1) in a reaction kettle filled with nitrogen protection, deionized water is used as a base solution;
(2) continuously flowing a solution formed by mixing transition metal salts with different molar ratios, a sodium hydroxide solution and an ammonia water solution into a reaction kettle;
(3) under the conditions that the temperature is 35-75 ℃ and the stirring speed is 300-1200 r/min, the pH is adjusted by using an ammonia water solution, a solution formed by mixing transition metal salts with different molar ratios, a sodium hydroxide solution and the ammonia water solution are subjected to precipitation reaction, feed liquid of the precipitation reaction is subjected to standing separation to obtain a precipitate, and the precipitate is washed and dried by an oven to obtain a multi-element precursor hydroxide;
(4) and uniformly mixing the multi-element precursor hydroxide with a lithium source, and sintering to obtain the multi-element anode material.
2. The method for preparing the multi-element cathode material according to claim 1, wherein in the step (2), the mixed solution of the transition metal salts comprises a nickel salt and a manganese salt, wherein the nickel salt is one or more of nickel sulfate, nickel chloride or nickel nitrate, and the manganese salt is one or more of manganese sulfate, manganese chloride or manganese nitrate.
3. The preparation method of the multi-element cathode material according to claim 1, wherein in the step (3), the pH is adjusted by using an ammonia water solution, and the pH is controlled to be 9.5-13.0.
4. The method for preparing the multi-element cathode material according to claim 1, wherein the molar concentration of the metal ions in the solution formed by mixing the transition metal salts is 1.0-3.5 mol/L.
5. The method for preparing the multi-element cathode material according to claim 1, wherein the concentration of the sodium hydroxide solution is 15-35%, and the concentration of the ammonia water solution is 10-28%.
6. The preparation method of the multi-element cathode material according to claim 1, wherein in the step (3), the feed liquid of the precipitation reaction is subjected to standing separation and washing by a centrifuge, and the pH of the deionized water after washing is controlled to be 7.00-9.50.
7. The preparation method of the multielement positive electrode material according to claim 1, wherein in the step (3), the temperature of the oven is set to be 80-130 ℃ during drying of the oven.
8. The method for preparing the multi-element cathode material according to claim 1, wherein in the step (4), the molar ratio of the multi-element precursor hydroxide to the lithium source is 1.03 to 1.20, and the lithium source is one or more of lithium nitrate, lithium carbonate or lithium hydroxide.
9. The preparation method of the multi-element cathode material according to claim 1, wherein in the step (4), the sintering temperature is 700-1100 ℃, the sintering time is 6-24 h, and the median particle diameter of the multi-element cathode material is 3.0-15.0 μm.
10. A multi-element positive electrode material prepared by the method for preparing a multi-element positive electrode material according to any one of claims 1 to 9.
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| CN111646522A (en) * | 2020-06-02 | 2020-09-11 | 格林美股份有限公司 | Cobalt-free precursor for lithium ion battery, positive electrode material and preparation method of cobalt-free precursor |
| CN112758993A (en) * | 2020-12-28 | 2021-05-07 | 宜宾光原锂电材料有限公司 | High-safety multi-element precursor, high-safety multi-element precursor cathode material and high-safety multi-element precursor cathode material production method |
| CN113603157A (en) * | 2021-08-03 | 2021-11-05 | 天能帅福得能源股份有限公司 | Cobalt-free binary anode material with core-shell structure and preparation method thereof |
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