CN116682952A - Coating method of positive electrode material, positive electrode plate and battery - Google Patents
Coating method of positive electrode material, positive electrode plate and battery Download PDFInfo
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- CN116682952A CN116682952A CN202310793106.0A CN202310793106A CN116682952A CN 116682952 A CN116682952 A CN 116682952A CN 202310793106 A CN202310793106 A CN 202310793106A CN 116682952 A CN116682952 A CN 116682952A
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- electrode material
- lithium
- coating
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- 239000007774 positive electrode material Substances 0.000 title claims abstract description 196
- 238000000576 coating method Methods 0.000 title claims abstract description 104
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000011248 coating agent Substances 0.000 claims abstract description 77
- 239000012153 distilled water Substances 0.000 claims abstract description 73
- 238000001035 drying Methods 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000010405 anode material Substances 0.000 claims abstract description 25
- 239000002904 solvent Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 66
- 229910052744 lithium Inorganic materials 0.000 claims description 56
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 26
- 239000002243 precursor Substances 0.000 claims description 20
- 238000005245 sintering Methods 0.000 claims description 16
- 239000007952 growth promoter Substances 0.000 claims description 13
- 229910013553 LiNO Inorganic materials 0.000 claims description 8
- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 claims description 8
- 229910000103 lithium hydride Inorganic materials 0.000 claims description 8
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 229910016817 Ni0.60Co0.20Mn0.20(OH)2 Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims description 4
- PQVSTLUFSYVLTO-UHFFFAOYSA-N ethyl n-ethoxycarbonylcarbamate Chemical compound CCOC(=O)NC(=O)OCC PQVSTLUFSYVLTO-UHFFFAOYSA-N 0.000 claims description 4
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical group [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 4
- 229940071264 lithium citrate Drugs 0.000 claims description 4
- WJSIUCDMWSDDCE-UHFFFAOYSA-K lithium citrate (anhydrous) Chemical compound [Li+].[Li+].[Li+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O WJSIUCDMWSDDCE-UHFFFAOYSA-K 0.000 claims description 4
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 4
- 229940040692 lithium hydroxide monohydrate Drugs 0.000 claims description 4
- GLXDVVHUTZTUQK-UHFFFAOYSA-M lithium hydroxide monohydrate Substances [Li+].O.[OH-] GLXDVVHUTZTUQK-UHFFFAOYSA-M 0.000 claims description 4
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 claims description 4
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052727 yttrium Inorganic materials 0.000 claims description 4
- 238000005406 washing Methods 0.000 abstract description 28
- 239000002351 wastewater Substances 0.000 abstract description 22
- 230000008569 process Effects 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 14
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 17
- 238000001914 filtration Methods 0.000 description 17
- 238000000975 co-precipitation Methods 0.000 description 12
- 239000011572 manganese Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 11
- 239000010406 cathode material Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 230000001737 promoting effect Effects 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- -1 is increased Substances 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000004821 distillation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 241000080590 Niso Species 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 239000011163 secondary particle Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- 229910000314 transition metal oxide Inorganic materials 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- VWBWQOUWDOULQN-UHFFFAOYSA-N nmp n-methylpyrrolidone Chemical compound CN1CCCC1=O.CN1CCCC1=O VWBWQOUWDOULQN-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
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
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The application discloses a coating method of a positive electrode material, a positive electrode plate and a battery, wherein the coating method of the positive electrode material comprises the following steps: s1, stirring and mixing a positive electrode material and distilled water, wherein the mass ratio of the positive electrode material to the distilled water is 1:0.3-0.9; s2, performing primary drying on the positive electrode material; s3, mixing the anode material and the coating liquid; s4, drying the anode material for the second time to obtain the coated anode material. The mass ratio of the positive electrode material to distilled water in the scheme disclosed by the application can be controlled at 1:0.3 at least without affecting the performance of the positive electrode material, and the problem that a large amount of wastewater is generated by washing the positive electrode material in the prior art is solved. Meanwhile, due to the reduction of the consumption of distilled water, the generation of waste water is reduced, the recovery time of water washing and coating solvents in a single process is reduced, and the problem of material performance degradation caused by exposure of the positive electrode material during the conventional long-time water washing is solved.
Description
Technical Field
The application belongs to the field of energy storage materials and electrochemistry, and particularly relates to a coating method of a positive electrode material, a positive electrode plate and a battery.
Background
As an important energy storage tool in the modern society, the lithium ion battery with high energy density not only realizes miniaturization and portability of electronic products, but also shows wide prospects in power batteries and energy storage systems. The electrochemical performance of the battery mainly depends on the positive electrode material, and the coating modification technology of the positive electrode material is very critical.
In the process of coating the positive electrode material, a water washing process is indispensable in order to reduce residual lithium of the positive electrode material for a lithium ion secondary battery. After washing, filtering and drying, the positive electrode material is subjected to a coating process in order to improve the surface stability of the positive electrode material. The coating process is mainly divided into wet coating and dry coating. Among them, wet coating has an advantage in that the anode material is impregnated and coated in the coating material, so that uniform coating as a whole is possible, but since solvent water for dissolving the coating material is used, a separate filtering and drying process must be performed after coating, and since the anode material is exposed to the solvent water during coating, the performance of the anode material is degraded, and there is a problem in that a large amount of waste water is generated. The dry coating method has the advantages of no use of solvent, no waste water generation and simple process. However, the wet coating has a problem of uneven coating, and not only the mixing efficiency is greatly reduced, but also a separate dust treatment facility is required.
Disclosure of Invention
In order to overcome the defects, the application aims to provide a coating method of a positive electrode material, a positive electrode plate and a battery, wherein the coating method of the positive electrode material is simple to operate and does not generate a large amount of waste water on the premise of ensuring that the performance of the battery is not influenced, and is more environment-friendly.
In order to achieve the above purpose, the application adopts the following technical scheme: a coating method of a positive electrode material, comprising the steps of:
s1, stirring and mixing a positive electrode material and distilled water, wherein the mass ratio of the positive electrode material to the distilled water is 1:0.3-0.9; illustratively, the mass ratio of positive electrode material to distilled water is 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9.
S2, performing primary drying on the positive electrode material;
s3, mixing the anode material and the coating liquid;
s4, drying the anode material for the second time to obtain the coated anode material.
Compared with the prior art, the mass ratio of the positive electrode material to distilled water is 1:1, and the positive electrode material is washed by distilled water, filtered and dried, so that a large amount of wastewater can be generated in the process. According to the application, the amount of distilled water is reduced, the mass ratio of the positive electrode material to distilled water is controlled to be 1:0.3-0.9, and the less and better distilled water is used on the premise of not influencing the performance of the positive electrode material in consideration of the waste water generation amount, and the inventor researches find that the mass ratio of the positive electrode material to distilled water can be controlled to be 1:0.3 at least without influencing the performance of the positive electrode material, so that the problem that a large amount of waste water is generated by washing the positive electrode material in the prior art is solved. Meanwhile, due to the reduction of the consumption of distilled water, the generation of waste water is reduced, the recovery time of water washing and coating solvents in a single process is reduced, and the problem of material performance degradation caused by exposure of the positive electrode material during the conventional long-time water washing is solved.
In the application, in S1, the mass ratio of the positive electrode material to distilled water is 1:0.3-0.5.
In the application, in S1, the mass ratio of the positive electrode material to distilled water is 1:0.3.
As a further arrangement of the application, in S1, the positive electrode material is placed in a reactor, and distilled water is sprayed to the positive electrode material through a nozzle of the reactor. Through setting up the nozzle on the reactor, spray distilled water through the nozzle to the positive pole material, make distilled water and positive pole material mix more even.
In the application, in S1, the molar ratio of Li/M in the positive electrode material is 0.98-1.05, and M is all metal elements except lithium in the positive electrode material. Illustratively, the Li/M molar ratio in the positive electrode material is 0.98, 0.99, 1.00, 1.01, 1.02, 1.03, 1.04, 1.05.
The present application is further configured such that the molar ratio of Li/M in the positive electrode material is 1.00 to 1.035.
In the present application, the positive electrode material in S1 has an average particle diameter of 10 to 12. Mu.m. The average particle diameter of the positive electrode material is exemplified by 10 μm, 11 μm, 12 μm.
In the application, in S2, the distilled water is recovered through a condenser to carry out first drying on the positive electrode material, the moisture content of the positive electrode material after drying is less than 0.1%, and the drying temperature is 100-120 ℃. Illustratively, the drying temperature is 100 ℃, 105 ℃, 110 ℃, 115 ℃, 120 ℃. In the prior art, the coating is subjected to separate filtering and drying processes, and the distilled water in the positive electrode material can be removed by a direct distillation mode due to the fact that the distilled water is used in a relatively small amount. The reactor is provided with a heating device, the reactor is provided with a condenser, the heating device is used for heating the reactor, the temperature in the reactor, namely the ambient temperature of the anode material, is increased, distilled water is evaporated, and the distilled water is condensed and recovered through the condenser. The drying process can be completed in the reactor without a conversion container. Compared with the prior art that the coating is subjected to independent filtration and drying processes, the process is simple and convenient to operate.
In the application, in S3, the mass ratio of the anode material to the coating liquid is 1:0.3-0.9; illustratively, the mass ratio of the polar material to the coating liquid is 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9. From the aspect of using the coating liquid, the smaller the coating liquid is, the better the performance of the positive electrode material is, and the inventor discovers that the mass ratio of the positive electrode material to the coating liquid can be controlled at 1:0.3 at the minimum without affecting the performance of the positive electrode material, and the surface coating of the positive electrode material can be more effectively improved while minimizing the using amount of the solvent during the coating.
In the application, in S3, the coating liquid contains an X element, and the X element is one or more of Al, B, zr, ti, mg, sr, nb, mo.
In the application, in S4, the positive electrode material is dried by recovering the solvent through the condenser, the moisture content of the positive electrode material after drying is less than 0.1%, and the drying temperature is 80-100 ℃. Illustratively, the drying temperature is 80 ℃, 85 ℃, 90 ℃, 95 ℃, 100 ℃.
The application is further configured that in S1-S4, the process is carried out under vacuum condition, and the vacuum degree is less than-0.1 bar.
As a further configuration of the present application, in S1, the positive electrode material is obtained by mixed sintering of a precursor and a lithium source, wherein the lithium source is selected from lithium carbonate (Li 2 CO 3 ) Lithium nitrate (LiNO) 3 ) Lithium nickelate (LiNO) 2 ) Lithium hydroxide (LiOH), lithium hydroxide monohydrate (LiOH. H) 2 O), lithium hydride (LiH), lithium fluoride (LiF), lithium chloride (LiCl), lithium bromide (LiBr), lithium acetate (CH) 3 COOLi), lithium oxide (Li 2 O), lithium sulfate (Li 2 SO 4 ) And lithium citrate (Li) 3 C 6 H 5 O 7 ) One or more of the following.
The application is further arranged that the precursor is composed of Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 The precursor had an average particle diameter (D50) of 12. Mu.m.
The application is further provided that the sintering is carried out after adding the particle growth promoter, the particle growth promoter is selected from one or more of Sr, zr, ti, Y, al, and the content of the particle growth promoter in the positive electrode material is 500-2000 ppm. Illustratively, the particulate growth promoter comprises 500ppm, 1000ppm, 1500ppm, 2000ppm of the positive electrode material.
The application provides a positive plate which comprises a current collector and a positive electrode material arranged on the current collector, wherein the positive electrode material is prepared by the coating method of the positive electrode material.
The application provides a battery comprising the positive plate.
The beneficial effects of the application are as follows:
1) The mass ratio of the positive electrode material to distilled water can be controlled at least at 1:0.3 without affecting the performance of the positive electrode material, and the problem that a large amount of wastewater is generated by washing the positive electrode material in the prior art is solved. Meanwhile, due to the reduction of the consumption of distilled water, the generation of waste water is reduced, the recovery time of water washing and coating solvents in a single process is reduced, and the problem of material performance degradation caused by exposure of the positive electrode material during the conventional long-time water washing is solved.
2) From the aspect of using the coating liquid, the smaller the coating liquid is, the better the performance of the positive electrode material is, and the inventor discovers that the mass ratio of the positive electrode material to the coating liquid can be controlled at 1:0.3 at the minimum without affecting the performance of the positive electrode material, and the surface coating of the positive electrode material can be more effectively improved while minimizing the using amount of the solvent during the coating.
3) The reactor is provided with a heating device, the reactor is provided with a condenser, the reactor is heated by the heating device, the environmental problem of the reactor, namely the anode material, is improved, distilled water is evaporated, and the distilled water is condensed and recovered by the condenser. The drying process can be completed in the reactor without a conversion container. Compared with the prior art that the coating is subjected to independent filtration and drying processes, the process is simple and convenient to operate.
Detailed Description
The following detailed description of the present application will provide further details in order to make the above-mentioned objects, features and advantages of the present application more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
The applicant found that in the wet coating process of the cathode material, water washing is required to remove residual lithium on the surface of the cathode material, and generally the mass ratio of the cathode material to water is 1:1, although the wet coating has an advantage that uniform coating can be performed as a whole, since solvent water for dissolving the coating material is used, it is necessary to pass through separate filtration and drying processes after coating, and since the cathode material is exposed to the solvent water during coating, the performance of the cathode material is degraded, and there is a problem that a large amount of waste water is generated.
An embodiment of the present application provides a coating method of a positive electrode material, including the steps of:
s1, stirring and mixing the positive electrode material and distilled water, wherein the mass ratio of the positive electrode material to the distilled water is 1:0.3-0.9.
Before coating the positive electrode material, the positive electrode material is prepared firstly, specifically, the positive electrode material is prepared by the following method:
s11, precursor Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 Is synthesized by (a)
1) Nickel source uses NiSO 4 ·6H 2 O, cobalt Source using CoSO 4 ·7H 2 The source of O and manganese is MnSO 4 ·H 2 O. These materials were dissolved in distilled water to prepare an aqueous metal salt solution.
2) After the coprecipitation reactor is prepared, N is used to prevent oxidation of metal ions during the coprecipitation reaction 2 The gas inside the coprecipitation reactor was replaced so that the inside of the coprecipitation reactor was free of oxygen, and the reactor temperature was maintained at 50 ℃.
3) NH is added to 4 (OH) was charged as a chelating agent into a coprecipitation reactor, and the pH of the reaction solution was adjusted by NaOH.
4) Filtering the obtained precipitate according to a coprecipitation process, washing with distilled water, and drying in a filter cake dryer at 120 ℃ to prepare a positive electrode material precursor. The precursor composition is Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 The average particle diameter (D50) was 12. Mu.m.
S12, preparation of positive electrode material
1) Weighing the precursor and the lithium source, mixing the precursor and the lithium source,
the lithium source is selected from lithium carbonate (Li) 2 CO 3 ) Lithium nitrate (LiNO) 3 ) Lithium nickelate (LiNO) 2 ) Lithium hydroxide (LiOH), lithium hydroxide monohydrate (LiOH. H) 2 O), lithium hydride (LiH), lithium fluoride (LiF), lithium chloride (LiCl), lithium bromide (LiBr), lithium acetate (CH) 3 COOLi), lithium oxide (Li 2 O), lithium sulfate (Li 2 SO 4 ) And lithium citrate (Li) 3 C 6 H 5 O 7 ) One or more of the following.
The precursor and the lithium source are weighed so that the molar ratio of Li/M in the positive electrode material prepared by the precursor and the lithium source is 0.98-1.05, M is all metal elements except lithium in the positive electrode material, and in the application, M is Ni, CO and Mn. Preferably, the Li/M molar ratio is between 1.00 and 1.035. By adjusting the amount of the lithium source to satisfy the molar ratio of Li/M, a positive electrode material of a lithium composite transition metal oxide composed of nickel (Ni) 60mol% or more and manganese (Mn) 20mol% or more can be formed.
2) Sintering
Before sintering, the particle growth promoter of the particle growth promoting element can be selected to be further mixed and then sintered, and the particle growth promoter is one or more selected from Sr, zr, ti, Y, al. The particle growth promoter containing the Sr and Zr promoting particle growth elements can be further mixed and then added into the lithium source and the precursor. The particle growth promoting agent may be mixed to contain 500 to 2000ppm of the above particle growth promoting element with respect to the total weight of the positive electrode material. Since the particle growth promoter is mixed in the range of 500 to 2000ppm, a lithium composite oxide positive electrode material in which nickel (Ni) is 60mol% or more and manganese (Mn) is 20mol% or more can be formed.
During sintering, the sintering temperature is 850-880 ℃, and sintering is carried out for 5-15 h under the condition of oxygen atmosphere.
The sintering can lead the average grain diameter of the secondary particles of the prepared NCM positive electrode material to reach 10-12 mu m.
S13, since the content of residual lithium due to unreacted lithium in the sintered positive electrode material is high, it is necessary to wash with distilled water to effectively reduce the content.
Specifically, after the positive electrode material to be washed and coated is placed in a reactor, vacuumizing is carried out, so that the internal condition of the reactor is vacuumized, the specific vacuum degree is below-0.1 bar, and the moisture content of the positive electrode material is 10% -16%.
The stirring device and the nozzle are arranged in the reactor, the stirring device is used for stirring the anode material in a vacuum state, and meanwhile, the nozzle in the reactor is used for spraying distilled water.
The mass ratio of the positive electrode material to distilled water is 1:0.3-0.9, and the positive electrode material is stirred for 5-30 min in a wet state. Compared with the prior art, the mass ratio of the positive electrode material to distilled water is 1:1, and a large amount of wastewater can be generated by washing the positive electrode material with distilled water, filtering and drying. According to the application, the amount of distilled water is reduced, the mass ratio of the positive electrode material to distilled water is controlled to be 1:0.3-0.9, and the less and better distilled water is used on the premise of not influencing the performance of the positive electrode material in consideration of the waste water generation amount, and the inventor researches find that the mass ratio of the positive electrode material to distilled water can be controlled to be 1:0.3 at least without influencing the performance of the positive electrode material, so that the problem that a large amount of waste water is generated by washing the positive electrode material in the prior art is solved. Meanwhile, due to the reduction of the consumption of distilled water, the generation of waste water is reduced, the recovery time of water washing and coating solvents in a single process is reduced, and the problem of material performance degradation caused by exposure of the positive electrode material during the conventional long-time water washing is solved.
S2, performing primary drying on the positive electrode material to obtain the positive electrode active material after removing residual lithium.
The temperature of the reactor is raised to 100-120 ℃, and the water existing in the reactor is recovered by evaporating and condensing by a condenser connected with the reactor. At this time, lithium existing in an unreacted state on the surface of the positive electrode material is dissolved in water, the content of residual lithium on the surface of the positive electrode material is reduced, and the lithium dissolved in the water is removed together with the water by a condenser. At this time, when the moisture content is less than 0.1%, the positive electrode material after removing the residual lithium is obtained.
In the prior art, the coating is subjected to separate filtering and drying processes, and the distilled water in the positive electrode material can be removed by a direct distillation mode due to the fact that the distilled water is used in a relatively small amount. The reactor is provided with a heating device, the reactor is provided with a condenser, the reactor is heated by the heating device, the environmental problem of the reactor, namely the anode material, is improved, distilled water is evaporated, and the distilled water is condensed and recovered by the condenser. The drying process can be completed in the reactor without a conversion container. Compared with the prior art that the coating is subjected to independent filtration and drying processes, the process is simple and convenient to operate.
S3, mixing the positive electrode material and the coating liquid, wherein the mass ratio of the positive electrode material to the coating liquid is 1:0.3-0.9.
The coating liquid is sprayed to the positive electrode material by utilizing the nozzle in the reactor while stirring the positive electrode material under the vacuum condition, and the coating liquid is sprayed to the positive electrode material nozzle by utilizing the nozzle.
The mass ratio of the positive electrode material to the coating liquid is 1:0.3-0.9, and the positive electrode material is stirred for 20-40 min in a wet state, so that the positive electrode material and the coating liquid are fully mixed. The coating liquid contains X element(s) of Al, B, zr, ti, mg, sr, nb, mo, such as Al 2 O 3 、B 2 O 3 、ZrO、TiO 2 、MgO、SrO、Nb 2 One or more of O5 and MnO.
According to the application, the amount of coating liquid is reduced, the mass ratio of the positive electrode material to the coating liquid is controlled to be 1:0.3-0.9, and from the aspect of the use amount of the coating liquid, the less and better the use amount of the coating liquid is under the premise of not influencing the performance of the positive electrode material, the inventor discovers that the mass ratio of the positive electrode material to the coating liquid can be controlled to be 1:0.3 at least without influencing the performance of the positive electrode material, and the surface coating of the positive electrode material can be more effectively improved while the use amount of the solvent is minimized during the coating.
S4, drying the anode material for the second time to obtain the coated anode material.
Heating the reactor to 80-100 ℃, and evaporating, condensing and recovering the organic solvent of the coating liquid in the reactor by using a condenser connected with the reactor. The organic solvent present inside the reactor was recovered by means of a condenser. The solvent content was dried to <0.1% to give a dried coated cathode material.
Examples
The present disclosure is more particularly described in the following examples that are intended as illustrations only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
Example 1: preparation of cathode Material
1. Precursor Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 Is synthesized by (a)
1) Nickel source uses NiSO 4 ·6H 2 O, cobalt Source using CoSO 4 ·7H 2 The source of O and manganese is MnSO 4 ·H 2 O. These materials were dissolved in distilled water to prepare an aqueous metal salt solution.
2) After the coprecipitation reactor is prepared, N is used to prevent oxidation of metal ions during the coprecipitation reaction 2 The gas inside the coprecipitation reactor was replaced so that the inside of the coprecipitation reactor was free of oxygen, and the reactor temperature was maintained at 50 ℃.
3) NH is added to 4 (OH) was charged as a chelating agent into a coprecipitation reactor, and the pH of the reaction solution was adjusted by NaOH.
4) Filtering the obtained precipitate according to a coprecipitation process, washing with distilled water, and drying in a filter cake vacuum dryer at 120 ℃ to prepare the anode materialAnd (3) a precursor. The precursor composition is Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 The average particle diameter (D50) was 12. Mu.m.
2. Preparation of a positive electrode material: weighing the precursor and the lithium source, mixing the precursor and the lithium source,
the lithium source is selected from lithium carbonate (Li) 2 CO 3 ) Lithium nitrate (LiNO) 3 ) Lithium nickelate (LiNO) 2 ) Lithium hydroxide (LiOH), lithium hydroxide monohydrate (LiOH. H) 2 O), lithium hydride (LiH), lithium fluoride (LiF), lithium chloride (LiCl), lithium bromide (LiBr), lithium acetate (CH) 3 COOLi), lithium oxide (Li 2 O), lithium sulfate (Li 2 SO 4 ) And lithium citrate (Li) 3 C 6 H 5 O 7 ) One or more of the following.
The precursor and the lithium source were weighed so that the Li/M molar ratio in the positive electrode material was 1.03, M being all metal elements other than lithium in the positive electrode material, in this example, M being the metals Ni, co, mn. By adjusting the input of the lithium source so as to satisfy the molar ratio of Li/M, a positive electrode material of a lithium composite transition metal oxide composed of nickel (Ni) 60mol% or more and manganese (Mn) 20mol% or more can be formed.
3. Sintering
During sintering, the sintering temperature is 850-880 ℃, and sintering is carried out for 10 hours under the condition of oxygen atmosphere. In the sintering, the particle growth promoter containing at least one or more elements for promoting particle growth in group Sr, zr, ti, Y, al may be selected, and further mixed and then sintered, or the particle growth promoter containing elements for promoting particle growth in Sr and Zr may be further mixed.
The particle growth promoting element mixture contains 500 to 2000ppm relative to the total weight of the cathode material. Since the particle growth promoter is mixed in the range of 500 to 2000ppm, a lithium composite oxide positive electrode material in which nickel (Ni) is 60mol% or more and manganese (Mn) is 20mol% or more can be formed. The sintering can lead the average grain diameter of the secondary particles of the prepared NCM positive electrode material to reach 10-12 mu m.
Example 2: washing and coating the positive electrode material: the mass ratio of the positive electrode material to distilled water is 1:0.3
Since the content of residual lithium caused by unreacted lithium in the sintered positive electrode material is high, it is necessary to wash with distilled water to effectively reduce the content, and the residual lithium is vacuum-filtered after washing, specifically, the vacuum degree is-0.1 bar or less, and the water content of the positive electrode material is about 15%.
The stirring device and the nozzle are arranged in the reactor, the stirring device is used for stirring the anode material in a vacuum state, and meanwhile, the nozzle in the reactor is used for spraying distilled water.
The mass ratio of the positive electrode material to distilled water is 1:0.3, and the positive electrode material is stirred for 10min in a wet state. Compared with the prior art, the mass ratio of the positive electrode material to distilled water is 1:1, and a large amount of wastewater can be generated by washing the positive electrode material with distilled water, filtering and drying. According to the application, the amount of distilled water is reduced, the mass ratio of the positive electrode material to distilled water is controlled at 1:0.3, and the smaller the distilled water is, the better the distilled water is on the premise of not influencing the performance of the positive electrode material, and the inventor researches find that the mass ratio of the positive electrode material to distilled water can be controlled at 1:0.3 at minimum without influencing the performance of the positive electrode material, so that the problem that a large amount of waste water is generated by washing the positive electrode material in the prior art is solved. Meanwhile, due to the reduction of the using amount of distilled water, the problem of performance degradation of the positive electrode material caused by exposure of the positive electrode material to a solvent in the coating process is solved.
S2, performing primary drying on the positive electrode material to obtain the positive electrode active material after removing residual lithium.
Before heating, the state of the inside of the reactor is changed into a vacuum state, the reactor is heated to 100 ℃ in the vacuum state, and the water existing in the inside of the reactor is recovered by evaporation and condensation of a condenser connected with the reactor. At this time, lithium existing in an unreacted state on the surface of the positive electrode material is dissolved in water, the content of residual lithium on the surface of the positive electrode material is reduced, and the lithium dissolved in the water is removed together with the water by a condenser. At this time, when the moisture content is less than 0.1%, the positive electrode material after removing the residual lithium is obtained.
In the prior art, the coating is subjected to separate filtering and drying processes, and the distilled water in the positive electrode material can be removed by a direct distillation mode due to the fact that the distilled water is used in a relatively small amount. The reactor is provided with a heating device, the reactor is provided with a condenser, the reactor is heated by the heating device, the environmental problem of the reactor, namely the anode material, is improved, distilled water is evaporated, and the distilled water is condensed and recovered by the condenser. The drying process can be completed in the reactor without a conversion container. Compared with the prior art that the coating is subjected to independent filtration and drying processes, the process is simple and convenient to operate.
S3, mixing the positive electrode material and the coating liquid, wherein the mass ratio of the positive electrode material to the coating liquid is 1:0.3.
The coating liquid is sprayed to the positive electrode material by utilizing the nozzle in the reactor while stirring the positive electrode material under the vacuum condition, and the coating liquid is sprayed to the positive electrode material nozzle by utilizing the nozzle.
The mass ratio of the positive electrode material to the coating liquid is 1:0.3, and the positive electrode material is stirred for 30min in a wet state, so that the positive electrode material and the coating liquid are fully mixed. The coating liquid contains X element(s) of Al, B, zr, ti, mg, sr, nb, mo, such as Al 2 O 3 、B 2 O 3 、ZrO、TiO 2 、MgO、SrO、Nb 2 O 5 One or more of MnO.
S4, drying the anode material for the second time to obtain the coated anode material.
The temperature of the reactor is raised to 80 ℃, and the organic solvent of the coating liquid in the reactor is recovered by utilizing a condenser connected with the reactor to evaporate and condense. The organic solvent present inside the reactor was recovered by means of a condenser. The solvent content was dried to <0.1% to give a dried positive electrode material.
Example 3: water-washing positive electrode material of traditional process
The positive electrode material prepared in example 1 is subjected to progressive water washing and drying, and the specific process is as follows: the positive electrode material was water-washed using distilled water (d.i. water resistance less than 25mΩ cm) as a solution. In the water washing process, the anode material used is LiNi 0.60 Co 0.20 Mn 0.20 (OH) 2 The slurry was prepared by stirring for 10 minutes at a usage amount of 100g, and after filtration, the slurry was dried in a vacuum drier at 100℃for 24 hours, thereby obtaining a positive electrode material from which residual lithium was removed.
Example 4: testing lithium residue of positive electrode active material
In this example, the positive electrode material prepared in example 1, the positive electrode material after the first drying in step S2 of example 2, and the positive electrode material washed with water by the conventional process in example 3 were respectively subjected to lithium residual measurement, and the test results are shown in table one:
from the data in Table one, it can be derived: the residual lithium ion of the positive electrode material not washed with water in example 1 reaches 13000ppm, thus making it necessary to have a large amount of residual lithium ion in the dry coating process. The lithium residue in the positive electrode material of example 2 was relatively close to that in the positive electrode material of example 3 by the wet water washing process, 3820ppm and 3680ppm, respectively, and it was calculated that 70.6% of the residual lithium was removed in example 2 and 71.6% of the residual lithium was removed in example 3. From the effect of removing residual lithium, the application is only 1% different from the water washing process.
Therefore, the dry coating does not have an effect of reducing lithium, and residual lithium can be reduced by washing with water by a wet method, but has disadvantages in that a large amount of waste water is generated and filtration and drying processes are required to be added. The application does not need to use a large amount of distilled water to wash the anode material, thereby reducing the production amount of wastewater. The application controls the mass ratio of the positive electrode material to distilled water to be 1:0.3, and achieves the effect of removing residual lithium ions.
The specific operation steps of the lithium residue test are as follows: the residual lithium content was determined with a titration solution of 0.1N HCl:
(1) After 5g of active material was placed in a 250ml beaker, 100g of water was measured, and stirred for 5 minutes to dissolve residual lithium formed on the surface of the active material.
(2) After completion of the stirring, a filtrate was obtained by filtration in a reduced pressure filtration apparatus containing a 110 mm cloth funnel using 150 mm-sized filter paper (ADVANTEC corporation, no. 2).
(3) The resulting filtrate was collected into a 150ml beaker and subjected to residual lithium titration according to the program of a computer program connected to a potentiometric titrator.
Example 5: preparation of half-buckling electricity preparation
In this example, three 2032 button half batteries were prepared using three positive electrode active materials, respectively, the three positive electrode active materials being different in coating method, and the positive electrode materials prepared in example 1 were coated by dry coating, wet coating, and the coating method provided in example 3 of the present application, respectively, and the prepared batteries were named dry coated battery one, wet coated battery two, and inventive battery three, respectively.
The preparation steps of the specific battery are as follows: the positive electrode active material, a polystyrene fluoride binder (trade name: KF 1100), and an acetylene black conductive material were mixed at 92.5:3.5:4, and adding the mixture to an N-Methyl-2-pyrrolidone (N-Methyl-2-pyrrolidone) solvent so that the solid weight was about 30% to prepare a positive electrode active slurry.
The above slurry was coated on the entire current collector layer of an aluminum foil (aluminum foil, thickness: 15 μm) using a blade (blade), and the positive electrode was rolled after drying. The positive electrode had a loading amount of 14.6mg/Ω and a rolling density of 3.1g/cm 3.
A 2032 coin half cell was prepared in a conventional manner using a positive electrode, a lithium metal negative electrode (200 μm thick, mixed metal), an electrolyte, and a polypropylene separator. 1M LiPF for electrolyte 6 A mixed solvent of dissolved ethylene carbonate and dimethyl carbonate (mixing ratio of 1:1 vol%).
Example 6
Performance tests were performed on the dry coated battery one, the wet coated battery two and the battery three of the present application prepared in example 5, and the test results are shown in table two:
and (II) table: battery performance comparison table:
from the battery performance data of the second test, the first discharge capacity of the dry-coated battery prepared by the dry-coated positive electrode material is the lowest, the second discharge capacity of the wet-coated battery prepared by the wet-coated positive electrode material is 190mAh/g, and the third discharge capacity of the battery prepared by the positive electrode material coated by the coating process provided by the application is 190mAh/g, so that the discharge capacity of the battery prepared by the coating process provided by the application is not reduced on the premise of reducing a large amount of waste water. That is, the process provided by the application has the advantages that the coating process is simpler and is easy to operate on the premise of keeping the performance of the battery, a large amount of waste water is not generated, and the process is more environment-friendly.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are only for illustrating the technical concept and features of the present application, and are intended to enable those skilled in the art to understand the content of the present application and to implement the same, but are not intended to limit the scope of the present application, and all equivalent changes or modifications made according to the spirit of the present application should be included in the scope of the present application.
Claims (17)
1. The coating method of the positive electrode material is characterized by comprising the following steps of:
s1, stirring and mixing a positive electrode material and distilled water, wherein the mass ratio of the positive electrode material to the distilled water is 1:0.3-0.9;
s2, performing primary drying on the positive electrode material;
s3, mixing the anode material and the coating liquid;
s4, drying the anode material for the second time to obtain the coated anode material.
2. The coating method of a positive electrode material according to claim 1, wherein in S1, the mass ratio of the positive electrode material to distilled water is 1:0.3-0.5.
3. The method according to claim 1, wherein in S1, the mass ratio of the positive electrode material to distilled water is 1:0.3.
4. The method of claim 1, wherein in S1, the positive electrode material is placed in a reactor, and distilled water is sprayed to the positive electrode material through a nozzle of the reactor.
5. The coating method of a positive electrode material according to claim 1, wherein in S1, the molar ratio of Li/M in the positive electrode material is 0.98 to 1.05, and M is all metal elements other than lithium in the positive electrode material.
6. The method of coating a positive electrode material according to claim 5, wherein the molar ratio of Li/M in the positive electrode material is 1.00 to 1.035.
7. The method for coating a positive electrode material according to claim 1, wherein in S1, the average particle diameter of the positive electrode material is 10 to 12 μm.
8. The method according to claim 1, wherein in S2, the positive electrode material is dried for the first time by recovering distilled water from a condenser, and the moisture content of the positive electrode material after the first drying is less than 0.1%, and the drying temperature is 100-120 ℃.
9. The coating method of a positive electrode material according to claim 1, wherein in S3, the mass ratio of the positive electrode material to the coating liquid is 1:0.3-0.9.
10. The method according to claim 1, wherein in S3, the coating solution contains an X element, and the X element is one or more of Al, B, zr, ti, mg, sr, nb, mo.
11. The method according to claim 1, wherein in S4, the solvent is recovered by a condenser to dry the positive electrode material for the second time, and the moisture content of the positive electrode material after the second drying is less than 0.1%, and the drying temperature is 80-100 ℃.
12. The method according to claim 1, wherein the steps S1 to S4 are performed under vacuum, and the vacuum degree is less than-0.1 bar.
13. The method of claim 1, wherein in S1, the positive electrode material is obtained by sintering a precursor and a lithium source, wherein the lithium source is selected from lithium carbonate (Li 2 CO 3 ) Lithium nitrate (LiNO) 3 ) Lithium nickelate (LiNO) 2 ) Lithium hydroxide (LiOH), lithium hydroxide monohydrate (LiOH. H) 2 O), lithium hydride (LiH), lithium fluoride (LiF), lithium chloride (LiCl), lithium bromide (LiBr), lithium acetate (CH) 3 COOLi), lithium oxide (Li 2 O), lithium sulfate(Li 2 SO 4 ) And lithium citrate (Li) 3 C 6 H 5 O 7 ) One or more of the following.
14. The method for coating a positive electrode material according to claim 13, wherein the precursor composition is Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 The precursor had an average particle diameter (D50) of 12. Mu.m.
15. The coating method of a positive electrode material according to claim 13, wherein the sintering is performed after adding a particle growth promoter selected from one or more of Sr, zr, ti, Y, al, and the particle growth promoter is present in an amount of 500 to 2000ppm based on the positive electrode material.
16. A positive electrode sheet, characterized in that the positive electrode sheet comprises a current collector and a positive electrode material disposed on the current collector, the positive electrode material being prepared by the coating method of the positive electrode material according to any one of claims 1 to 15.
17. A battery comprising the positive electrode sheet according to claim 16.
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