CN114835172A - Cobalt hydroxide particles and preparation method and application thereof - Google Patents
Cobalt hydroxide particles and preparation method and application thereof Download PDFInfo
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- CN114835172A CN114835172A CN202210615884.6A CN202210615884A CN114835172A CN 114835172 A CN114835172 A CN 114835172A CN 202210615884 A CN202210615884 A CN 202210615884A CN 114835172 A CN114835172 A CN 114835172A
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- 239000002245 particle Substances 0.000 title claims abstract description 86
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 title claims abstract description 83
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000000243 solution Substances 0.000 claims abstract description 95
- 238000006243 chemical reaction Methods 0.000 claims abstract description 94
- 238000000975 co-precipitation Methods 0.000 claims abstract description 73
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 39
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 39
- 150000001868 cobalt Chemical class 0.000 claims abstract description 29
- 239000012266 salt solution Substances 0.000 claims abstract description 27
- 230000032683 aging Effects 0.000 claims abstract description 25
- 239000003513 alkali Substances 0.000 claims abstract description 16
- 239000002585 base Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 44
- 238000005406 washing Methods 0.000 claims description 42
- 235000006708 antioxidants Nutrition 0.000 claims description 38
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 23
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 23
- 239000011261 inert gas Substances 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 238000003825 pressing Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- WTDHULULXKLSOZ-UHFFFAOYSA-N Hydroxylamine hydrochloride Chemical compound Cl.ON WTDHULULXKLSOZ-UHFFFAOYSA-N 0.000 claims description 10
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 10
- 229940044175 cobalt sulfate Drugs 0.000 claims description 9
- 229910000361 cobalt sulfate Inorganic materials 0.000 claims description 9
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 9
- 229910001429 cobalt ion Inorganic materials 0.000 claims description 8
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims description 8
- -1 hydroxide ions Chemical class 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 7
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 7
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 235000010323 ascorbic acid Nutrition 0.000 claims description 3
- 239000011668 ascorbic acid Substances 0.000 claims description 3
- 229960005070 ascorbic acid Drugs 0.000 claims description 3
- 235000010378 sodium ascorbate Nutrition 0.000 claims description 3
- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 claims description 3
- 229960005055 sodium ascorbate Drugs 0.000 claims description 3
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000002431 foraging effect Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- 238000007796 conventional method Methods 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000012670 alkaline solution Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910000428 cobalt oxide Inorganic materials 0.000 description 3
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 241000220317 Rosa Species 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G51/00—Compounds of cobalt
- C01G51/04—Oxides; Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/75—Cobalt
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- 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
- C01P2006/80—Compositional purity
-
- 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)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention provides cobalt hydroxide particles and a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing a cobalt salt solution, an alkali liquor and an antioxidant solution into the base liquor to carry out coprecipitation reaction; maintaining the pH value of the coprecipitation reaction to be 5-8 within the first 0.3-0.6h of the coprecipitation reaction, and maintaining the pH value of the coprecipitation reaction to be 12.5-13.0 within the later time; and after the coprecipitation reaction is finished, aging and post-treatment are carried out to obtain the cobalt hydroxide particles. According to the invention, the pH values of the early stage and the later stage of the coprecipitation reaction are controlled, so that the prepared cobalt hydroxide is regular hexagonal in shape and smaller in particle size, and the problems that the cobalt hydroxide obtained by a conventional method is non-granular, too large in particle size, more in impurities and low in purity are solved; in addition, the preparation method disclosed by the invention is low in energy consumption and high in production efficiency, and can realize large-scale production.
Description
Technical Field
The invention belongs to the field of cobalt material preparation, relates to a cobalt hydroxide particle, and particularly relates to a cobalt hydroxide particle and a preparation method and application thereof.
Background
The cobalt oxide is widely applied to materials such as a lithium battery anode, a lithium battery cathode, catalysis, electrochemical capacitance and the like. Because the cobalt hydroxide is simple to synthesize and does not generate harmful gases such as nitric oxide, sulfur dioxide and the like, the cobalt hydroxide is very suitable for preparing precursors of lithium ion battery anode materials, electrochemical capacitors, molecular sieves and cobalt oxide nano materials. The cobalt hydroxide and the cobalt oxide precursor contribute to the promotion of the filling performance of the cathode material. The superfine cobalt hydroxide particles are divalent, have small particle size, are irregular and non-fixed, and are better positive electrode material fillers.
At present, the industrialization process of cobalt hydroxide has the following problems: (1) in the reaction process, hexagonal sheets are easily generated in a low-alkaline state and are not beneficial to filling, and plate-shaped particles are formed due to the aggregation of nucleation particles in a high-alkaline state, so that the large-particle-size distribution of D100 is not concentrated, and the block-shaped particles are not beneficial to impurity cleaning; in the subsequent drying process, because the particles are small, the surface activation energy is high, the drying is easy to agglomerate, and the improvement of the existing crushing equipment on the larger D100 particle size is limited; (2) because cobalt hydroxide is easily oxidized into cobalt oxyhydroxide and cobaltosic oxide in an oxygen-containing atmosphere in a high-alkaline solution or in a wet material state, the cobalt hydroxide is light brown and is brownish black in severe cases. Although inert gas such as nitrogen can be introduced in the preparation process, the rose red is easily oxidized in the subsequent aging, filtering, washing, drying, crushing and other processes, so that the rose red has non-pure color and high cobalt content; (3) because the cobalt hydroxide particles are small, generally D50 is less than 1 μm, the filtration yield is not high, or the production efficiency can not be ensured under the condition of high yield; (4) a large amount of waste water is generated, the energy consumption is high, and the production efficiency is low.
For example, CN 107804878A discloses a preparation method of crude cobalt hydroxide, comprising the following steps: (1) and (3) precipitation: adopting magnesium hydroxide slurry as a precipitator, precipitating the preliminarily purified cobalt sulfate solution to prepare rough cobalt hydroxide, preparing 10-20 wt% magnesium hydroxide slurry, and using the slurry as the precipitator after a filtering process; (2) washing: adopting a 2-5 stage countercurrent washing mode to transfer the cobalt hydroxide precipitate obtained in the step (1) from one stage to the next stage by one stage after washing with a cobalt sulfate solution; (3) washing with water: carrying out size mixing and water washing on the precipitate subjected to counter-current washing in the step (2), washing the carried cobalt ions, and finally filtering the precipitate subjected to water washing to obtain a final rough cobalt hydroxide product; the cobalt hydroxide obtained by the preparation method of the rough cobalt hydroxide has large particles, is easy to oxidize, has high energy consumption and low production efficiency.
Based on the above research, it is desirable to provide a method for preparing cobalt hydroxide particles, which can effectively prevent cobalt hydroxide from being oxidized, and the obtained cobalt hydroxide particles have a smaller particle size, and can be produced on a large scale.
Disclosure of Invention
The invention aims to provide cobalt hydroxide particles and a preparation method and application thereof, and particularly provides orthohexagonal cobalt hydroxide particles and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for preparing cobalt hydroxide particles, comprising the steps of:
(1) mixing a cobalt salt solution, an alkali liquor and an antioxidant solution into the base liquor to carry out coprecipitation reaction;
maintaining the pH value of the coprecipitation reaction to be 5-8 within the first 0.3-0.6h of the coprecipitation reaction, and maintaining the pH value of the coprecipitation reaction to be 12.5-13.0 within the later time;
(2) and (2) after the coprecipitation reaction in the step (1) is finished, aging and post-treatment are carried out to obtain the cobalt hydroxide particles.
In the coprecipitation reaction process, the pH in the early stage of the reaction is firstly kept in a weakly alkaline environment, and the strongly alkaline environment is kept in the later stage of the reaction, so that cobalt hydroxide particles with a regular hexagonal shape and smaller particle size are prepared, and the problems that the shape of a product generated in a low-alkaline state is not favorable for filling and the particles are aggregated into a plate shape in a high-alkaline state are solved; meanwhile, the antioxidant is added in the preparation process, so that the problem that cobalt hydroxide is easy to oxidize in a high-alkaline solution can be solved.
The coprecipitation reaction is carried out for the first 0.3 to 0.6h, such as 0.3h, 0.35h, 0.4h, 0.45h, 0.5h, 0.55h or 0.6h, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable; illustratively, within the first 0.3h of the coprecipitation reaction, it means that the pH of the reaction is 5 to 8 from the beginning to the 0.3h of the coprecipitation reaction.
The pH for maintaining the coprecipitation reaction is 5 to 8, and may be, for example, 5, 5.5, 6, 6.5, 7, 7.5 or 8, but is not limited to the values recited, and other values not recited within the range of values are also applicable.
Preferably, the total time of the coprecipitation reaction in step (1) is 0.8 to 1.2 hours, and may be, for example, 0.8 hour, 0.85 hour, 0.9 hour, 0.95 hour, 1.0 hour, 1.05 hour, 1.1 hour, 1.15 hour or 1.2 hours, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the temperature of the coprecipitation reaction in step (1) is 20 to 25 ℃, and may be, for example, 20 ℃, 20.5 ℃, 21 ℃, 21.5 ℃, 22 ℃, 22.5 ℃, 23 ℃, 23.5 ℃, 24 ℃, 24.5 ℃ or 25 ℃, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
The coprecipitation reaction time in the step (1) of the invention is short, the production efficiency can be greatly improved, the reaction is carried out at a low reaction temperature, the energy consumption can be saved, and the cobalt hydroxide particles with smaller particle size and regular hexagon shape can be obtained.
Preferably, the base liquid of step (1) comprises pure water.
The coprecipitation reaction of the invention adopts pure water as the base solution, and can avoid the introduction of other impurity ions, thereby avoiding the influence on the growth of cobalt hydroxide particles.
Preferably, the volume of the base solution in step (1) is 20-65L, such as 20L, 25L, 30L, 35L, 40L, 45L, 50L, 55L, 60L or 65L, but not limited to the values listed, and other values not listed in the range of values are also applicable.
Preferably, the cobalt salt solution, the lye and the antioxidant solution of step (1) are mixed into the base solution by means of a metering pump in cocurrent flow.
The invention realizes the parallel flow mixing of the cobalt salt solution, the alkali liquor and the antioxidant solution into the base solution by the metering pump, wherein the cobalt salt solution, the alkali liquor and the antioxidant solution respectively enter three feed inlets when in parallel flow, and the shower head design is adopted at the outlet end to ensure that the cobalt salt solution, the alkali liquor and the antioxidant solution are quickly reacted in the base solution and are in a uniform dispersion state; and the metering pump is adopted to realize parallel flow, so that the addition amounts of the cobalt salt solution, the alkali liquor and the antioxidant solution can be strictly regulated and controlled, and the influence of the fluctuation of the addition amount on the pH value of the reaction system is avoided.
Preferably, the stirring speed of the coprecipitation reaction in step (1) is 300-600r/min, such as 300r/min, 400r/min, 500r/min or 600r/min, but not limited to the values listed, and other values not listed in the value range are also applicable.
Preferably, the coprecipitation reaction of step (1) is performed under an atmosphere of nitrogen and/or an inert gas.
Preferably, in the coprecipitation reaction in step (1), the molar ratio of hydroxide ions to cobalt ions is 2.1-3.1, and may be, for example, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0 or 3.1, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the volume ratio of the antioxidant solution to the cobalt salt solution in step (1) is (0.6-1): (250) -350), and may be, for example, 0.6:250, 0.8:300, 1:250 or 1:350, but is not limited to the values recited, and other values not recited in the range of values are also applicable.
Preferably, the concentration of the cobalt salt solution in step (1) is 127-132g/L, such as 127g/L, 128g/L, 129g/L, 130g/L, 131g/L or 132g/L, but not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the concentration of the alkali liquor in step (1) is 426-440g/L, such as 426g/L, 428g/L, 430g/L, 432g/L, 434g/L, 436g/L, 438g/L or 440g/L, but not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the concentration of the antioxidant solution in step (1) is 2.5-5%, for example, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the cobalt salt in the cobalt salt solution in step (1) comprises any one of cobalt chloride, cobalt sulfate or cobalt nitrate or a combination of at least two of them, and typical but non-limiting combinations include a combination of cobalt chloride and cobalt sulfate, or a combination of cobalt chloride or cobalt nitrate, preferably cobalt chloride.
Preferably, the lye of step (1) comprises a KOH solution and/or a NaOH solution.
Preferably, the antioxidant in the antioxidant solution of step (1) comprises any one or a combination of at least two of hydrazine hydrate, hydroxylamine hydrochloride, ascorbic acid or sodium ascorbate, typical but not limiting combinations include a combination of hydrazine hydrate and hydroxylamine hydrochloride, a combination of ascorbic acid and sodium ascorbate, preferably hydrazine hydrate and/or hydroxylamine hydrochloride.
Preferably, the coprecipitation reaction in step (1) is carried out in a reaction kettle.
Preferably, the coprecipitation reaction of step (1) is controlled in temperature by a water cooler.
Preferably, before the cobalt salt solution, the alkaline solution and the antioxidant solution are mixed into the base solution in step (1), a step of introducing nitrogen and/or inert gas for 30-60min is further included, for example, 30min, 40min, 50min or 60min, but not limited to the values listed, and other values not listed in the range of the values are also applicable.
According to the invention, before the reaction raw materials are added in a parallel flow manner, nitrogen and/or inert gas is introduced for a period of time, so that the whole reaction system is completely in the atmosphere of nitrogen and/or inert gas at the beginning, and the oxidation of cobalt hydroxide is avoided to the greatest extent.
Preferably, after the coprecipitation reaction in step (1) is completed, the co-current addition of the cobalt salt solution, the alkali solution and the antioxidant solution is stopped, and after 200-600mL of the antioxidant solution is added in one portion, the aging is performed, for example, 200mL, 300mL, 400mL, 500mL or 600mL, but not limited to the values listed, and other values not listed in the numerical range are also applicable.
After the coprecipitation reaction is finished, the feeding is stopped, and the cobalt hydroxide solution obtained after the coprecipitation reaction is protected by adding the antioxidant once, so that the oxidation risk in the aging process is avoided, and the purity of cobalt hydroxide particles is improved.
Preferably, the temperature of aging in step (2) is 40-55 deg.C, such as 40 deg.C, 42 deg.C, 44 deg.C, 46 deg.C, 48 deg.C, 50 deg.C, 52 deg.C, 54 deg.C or 55 deg.C, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
After the coprecipitation reaction is finished, the temperature is moderately raised, the aging reaction is carried out, and the growth of the target cobalt hydroxide particles is promoted.
Preferably, the aging time in step (2) is 0.8 to 1.2h, for example 0.8h, 0.85h, 0.9h, 0.95h, 1.0h, 1.05h, 1.1h, 1.15h or 1.2h, but not limited to the recited values, and other values not recited in the numerical range are equally applicable.
Preferably, the stirring rate for the aging in step (2) is 50 to 200r/min, for example 50r/min, 70r/min, 90r/min, 110r/min, 130r/min, 150r/min, 170r/min, 190r/min or 200r/min, but not limited to the values listed, and other values not listed in the numerical range are equally applicable.
Preferably, the post-treatment in the step (2) comprises filter pressing, washing, drying, crushing and iron removal which are sequentially carried out.
Preferably, the filter pressing adopts a plate and frame filter pressing mode.
Preferably, the washing solution comprises an antioxidant solution and pure water in a volume ratio of 1 (400) -600, which may be, for example, 1:400, 1:450, 1:500, 1:550 or 1:600, but is not limited to the recited values, and other values not recited within the range of values are equally applicable.
The washing liquid adopted by the invention also comprises an antioxidant which is used for comprising cobalt hydroxide and avoiding the oxidation of the cobalt hydroxide during post-treatment.
Preferably, the temperature of the washing liquid is 50-70 ℃, for example 50 ℃, 55 ℃, 60 ℃, 65 ℃ or 70 ℃, but not limited to the recited values, and other values not recited in the numerical range are equally applicable.
Preferably, the number of washing is 2-4, for example, 2, 3 or 4, and after each washing, solid-liquid separation is performed by a filter pressing method.
Preferably, the time for each of said washes is 30-90min, for example 30min, 40min, 50min, 60min, 70min, 80min or 90min, but is not limited to the recited values, and other values not recited in the numerical range are equally applicable.
Preferably, the temperature of the drying is 60-90 ℃, for example, 60 ℃, 70 ℃, 80 ℃ or 90 ℃, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the drying time is 4-10h, for example, 4h, 5h, 6h, 7h, 8h, 9h or 10h, but not limited to the recited values, and other values not recited in the range of values are also applicable.
As a preferable technical scheme of the preparation method, the preparation method comprises the following steps:
(1) introducing nitrogen and/or inert gas into a reaction kettle containing pure water for 30-60min, mixing a cobalt salt solution, an alkali liquor and an antioxidant solution into the pure water in a cocurrent flow mode through a metering pump, carrying out coprecipitation reaction for 0.8-1.2h at the temperature of 20-25 ℃ and the stirring speed of 300-600r/min, maintaining the pH of the coprecipitation reaction to be 5-8 within the first 0.3-0.6h, and maintaining the pH of the coprecipitation reaction to be 12.5-13.0 within the later time;
the coprecipitation reaction is carried out in the atmosphere of nitrogen and/or inert gas, wherein the molar ratio of hydroxide ions to cobalt ions is 2.1-3.1, and the volume ratio of antioxidant solution to cobalt salt solution is (0.6-1): 250-350); the concentration of the cobalt salt solution is 132g/L of 127-;
(2) after the coprecipitation reaction in the step (1) is finished, stopping adding a cobalt salt solution, an alkali solution and an antioxidant solution in a parallel flow manner, adding 600mL of 200-fold solution of the antioxidant at one time, aging for 0.8-1.2h in the atmosphere of nitrogen and/or inert gas at the temperature of 40-55 ℃ and at the stirring speed of 50-200r/min, performing plate-and-frame filter pressing after the aging is finished, washing for 2-4 times, performing filter pressing again, drying the obtained particles for 4-10h at the temperature of 60-90 ℃, and crushing and removing iron to obtain the cobalt hydroxide particles;
the washing liquid comprises antioxidant solution and pure water in a volume ratio of 1 (400-600), the temperature of the washing liquid is 50-70 ℃, and the time of each washing is 30-90 min.
The solution according to the invention refers to an aqueous solution.
In a second aspect, the present invention provides a cobalt hydroxide particle produced by the production method according to the first aspect.
Preferably, the cobalt hydroxide particles have a particle size D 50 Is 0.6 to 1.6. mu.m, and may be, for example, 0.6. mu.m, 0.8. mu.m, 1.0. mu.m, 1.2. mu.m, 1.4. mu.m or 1.6. mu.m, but not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the cobalt hydroxide particles have a particle size D 100 Less than 20 μm, for example 20 μm, 18 μm, 16 μm, 14 μm, 12 μm, 10 μm, 8 μm or 6 μm, but is not limited theretoThe recited values, other values within the range of values not recited are equally applicable.
Preferably, the cobalt hydroxide particles have (D) 90 -D 10 )/D 50 Is 1.8 to 1.9, and can be, for example, 1.8, 1.82, 1.84, 1.86, 1.88 or 1.9, but is not limited to the recited values, and other values not recited in the numerical range are equally applicable.
Preferably, the morphology of the cobalt hydroxide particles is regular hexagonal.
Preferably, the cobalt hydroxide particles have a magnetic foreign material content of 100ppb or less, and may be, for example, 100ppb, 90ppb, 80ppb, 70ppb, 60ppb, 50ppb or 40ppb, but not limited to the recited values, and other values not recited within the numerical ranges are also applicable.
The cobalt hydroxide particles are obtained by the preparation method of the first aspect, the morphology of the particles is regular hexagonal, and the particle size of the particles is small.
In a third aspect, the present invention provides a use of cobalt hydroxide particles as described in the first aspect, including in a battery material or a catalyst material.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the pH values of the early stage and the later stage of the coprecipitation reaction are controlled to be matched with the lower reaction temperature, and the temperature is moderately raised in the aging process, so that the prepared cobalt hydroxide has a regular hexagonal shape and smaller particle size, and the problems of non-granular cobalt hydroxide, overlarge particle size, more impurities and low purity obtained by a conventional method are solved; meanwhile, the antioxidant is added in the coprecipitation reaction stage, the aging stage and the washing stage in the preparation process, so that the problem of easy oxidation of cobalt hydroxide can be avoided to the greatest extent.
Drawings
FIG. 1 is a scanning electron microscope image at 5000 magnification of cobalt hydroxide particles obtained in example 1 of the present invention.
FIG. 2 is a scanning electron micrograph of cobalt hydroxide particles obtained in example 1 of the present invention at a magnification of 10000.
Figure 3 is an XRD pattern of cobalt hydroxide particles obtained in example 1 of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
This example provides a method for preparing cobalt hydroxide particles, including the following steps:
(1) introducing nitrogen and/or inert gas for 45min into a reaction kettle containing pure water, mixing a cobalt chloride solution, a NaOH solution and a hydrazine hydrate solution into the pure water in a cocurrent flow mode through a metering pump, carrying out a coprecipitation reaction for 1h at the temperature of 23 ℃ and the stirring speed of 500r/min, maintaining the pH of the coprecipitation reaction to be 6.5 within the first 0.5h, and maintaining the pH of the coprecipitation reaction to be 12.7 within the later 0.5 h;
the coprecipitation reaction is carried out in the atmosphere of nitrogen and/or inert gas, wherein the molar ratio of hydroxide ions to cobalt ions is 2.5, and the volume ratio of a hydrazine hydrate solution to a cobalt chloride solution is 0.8: 300; the concentration of the cobalt chloride solution is 200g/L, the concentration of the NaOH solution is 435g/L, the concentration of the hydrazine hydrate solution is 3%, and the volume of pure water is 40L;
(2) after the coprecipitation reaction in the step (1) is finished, stopping adding a cobalt chloride solution, a NaOH solution and a hydrazine hydrate solution in a parallel flow manner, adding 400mL of hydrazine hydrate solution at one time, aging for 1h in the atmosphere of nitrogen and/or inert gas at the temperature of 50 ℃ and at the stirring speed of 150r/min, carrying out plate-and-frame filter pressing after the aging is finished, washing for 3 times, then carrying out filter pressing, drying the obtained particles for 7h at the temperature of 80 ℃, and crushing and removing iron to obtain the cobalt hydroxide particles;
the washing liquid comprises hydrazine hydrate solution and pure water in a volume ratio of 1:500, the temperature of the washing liquid is 60 ℃, and the washing time is 60min each time;
the morphology of the cobalt hydroxide particles obtained in this example was orthohexagonal, (D) 90 -D 10 )/D 50 1.85, the content of the magnetic foreign matter was 50ppb, the scanning electron micrograph at 5000 magnification was shown in FIG. 1, the scanning electron micrograph at 10000 magnification was shown in FIG. 2, the XRD plot was shown in FIG. 3, and the diffraction peak positions corresponding to the 001, 100, 101, 102, 110, 111 and 103 crystal planes were plotted in FIG. 3.
Example 2
This example provides a method for preparing cobalt hydroxide particles, including the following steps:
(1) introducing nitrogen and/or inert gas into a reaction kettle containing pure water for 30min, mixing a cobalt nitrate solution, a NaOH solution and a hydrazine hydrate solution into the pure water in a cocurrent flow mode through a metering pump, carrying out a coprecipitation reaction for 1.2h at the temperature of 20 ℃ and the stirring speed of 300r/min, maintaining the pH of the coprecipitation reaction to be 5 within the first 0.6h, and maintaining the pH of the coprecipitation reaction to be 13.0 within the later 0.6 h;
the coprecipitation reaction is carried out in the atmosphere of nitrogen and/or inert gas, wherein the molar ratio of hydroxide ions to cobalt ions is 2.1, and the volume ratio of a hydrazine hydrate solution to a cobalt nitrate solution is 0.6: 350; the concentration of the cobalt nitrate solution is 127g/L, the concentration of the NaOH solution is 440g/L, the concentration of the hydrazine hydrate solution is 2.5%, and the volume of pure water is 65L;
(2) after the coprecipitation reaction in the step (1) is finished, stopping adding a cobalt nitrate solution, a NaOH solution and a hydrazine hydrate solution in a parallel flow manner, adding 600mL of hydrazine hydrate solution at one time, aging for 1.2h in the atmosphere of nitrogen and/or inert gas at the temperature of 55 ℃ and at the stirring speed of 200r/min, carrying out plate-and-frame filter pressing after the aging is finished, washing for 2 times, then carrying out filter pressing, drying the obtained particles for 4h at the temperature of 90 ℃, and crushing and deironing the particles to obtain the cobalt hydroxide particles;
the washing liquid comprises hydrazine hydrate solution and pure water in a volume ratio of 1:400, the temperature of the washing liquid is 50 ℃, and the washing time is 90min each time;
the morphology of the cobalt hydroxide particles obtained in this example was orthohexagonal, (D) 90 -D 10 )/D 50 1.80, and the content of magnetic foreign matter was 100 ppb.
Example 3
This example provides a method for preparing cobalt hydroxide particles, including the following steps:
(1) introducing nitrogen and/or inert gas into a reaction kettle containing pure water for 60min, mixing a cobalt sulfate solution, a KOH solution and a hydrazine hydrate solution into the pure water in a cocurrent flow mode through a metering pump, carrying out a coprecipitation reaction for 0.8h at the temperature of 25 ℃ and the stirring speed of 600r/min, maintaining the pH of the coprecipitation reaction to be 8 within the first 0.3h, and maintaining the pH of the coprecipitation reaction to be 12.5 within the later 0.5 h;
the coprecipitation reaction is carried out in the atmosphere of nitrogen and/or inert gas, wherein the molar ratio of hydroxide ions to cobalt ions is 3.1, and the volume ratio of a hydrazine hydrate solution to a cobalt sulfate solution is 1: 250; the concentration of the cobalt sulfate solution is 132g/L, the concentration of the KOH solution is 426g/L, the concentration of the hydrazine hydrate solution is 5 percent, and the volume of pure water is 20L;
(2) after the coprecipitation reaction in the step (1) is finished, stopping adding a cobalt sulfate solution, a KOH solution and a hydrazine hydrate solution in a parallel flow manner, adding 200mL of hydrazine hydrate solution at one time, aging for 0.8h in the atmosphere of nitrogen and/or inert gas at the temperature of 40 ℃ and at the stirring speed of 50r/min, performing plate and frame type filter pressing after the aging is finished, washing for 4 times, then performing filter pressing, drying the obtained particles for 10h at the temperature of 60 ℃, and crushing and removing iron to obtain the cobalt hydroxide particles;
the washing liquid comprises hydrazine hydrate solution and pure water in a volume ratio of 1:600, the temperature of the washing liquid is 70 ℃, and the washing time is 30min each time;
the morphology of the cobalt hydroxide particles obtained in this example was orthohexagonal, (D) 90 -D 10 )/D 50 1.9, and the content of magnetic foreign matter was 80 ppb.
Comparative example 1
This comparative example provides a method of preparing cobalt hydroxide particles, which was the same as example 1 except that the pH of the coprecipitation reaction in step (1) was always 6.5.
The system pH value in the reaction process of the comparative example is too low, so that the cobalt hydroxide can not form a regular hexagon and the starting particle size is larger.
Comparative example 2
This comparative example provides a method of preparing cobalt hydroxide particles, which was the same as example 1 except that the pH of the coprecipitation reaction in step (1) was always 12.7.
The pH value of the system in the reaction process of the comparative example is too high, so that the regular hexagon of the cobalt hydroxide is too fine, and the cobalt hydroxide is easy to agglomerate and oxidize in the drying process, so that the purity of the prepared cobalt hydroxide particles is reduced.
As can be seen from examples 1-3 and comparative examples 1-2, in the coprecipitation reaction process, the cobalt hydroxide particles with regular hexagonal shape, small particle size, high purity and high yield can be obtained by controlling the pH difference between the early stage and the later stage of the reaction.
In summary, the invention provides cobalt hydroxide particles and a preparation method and application thereof, the preparation method has low energy consumption and high production efficiency, and can realize large-scale production, and the prepared cobalt hydroxide is regular hexagonal in shape and smaller in particle size mainly by controlling the pH at the early stage and the later stage of coprecipitation reaction and matching with a lower reaction temperature and increasing the temperature moderately in the aging process, and the problem that the cobalt hydroxide is easy to oxidize can be avoided to the greatest extent in the preparation process.
The above description is only for the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure of the present invention.
Claims (10)
1. A method for preparing cobalt hydroxide particles, comprising the steps of:
(1) mixing a cobalt salt solution, an alkali liquor and an antioxidant solution into the base liquor to carry out coprecipitation reaction;
maintaining the pH value of the coprecipitation reaction to be 5-8 within the first 0.3-0.6h of the coprecipitation reaction, and maintaining the pH value of the coprecipitation reaction to be 12.5-13.0 within the later time;
(2) and (2) after the coprecipitation reaction in the step (1) is finished, aging and post-treatment are carried out to obtain the cobalt hydroxide particles.
2. The preparation method according to claim 1, wherein the total time of the coprecipitation reaction in step (1) is 0.8 to 1.2 hours;
preferably, the temperature of the coprecipitation reaction in the step (1) is 20-25 ℃;
preferably, the base liquid of step (1) comprises pure water;
preferably, the volume of the base solution in the step (1) is 20-65L;
preferably, the cobalt salt solution, the lye and the antioxidant solution of step (1) are mixed into the base solution by means of a metering pump in cocurrent flow.
3. The preparation method according to claim 1 or 2, wherein the stirring speed of the coprecipitation reaction in step (1) is 300-600 r/min;
preferably, the coprecipitation reaction of step (1) is carried out under an atmosphere of nitrogen and/or an inert gas;
preferably, in the coprecipitation reaction in the step (1), the molar ratio of hydroxide ions to cobalt ions is 2.1-3.1;
preferably, the volume ratio of the antioxidant solution to the cobalt salt solution in the step (1) is (0.6-1): 250-350).
4. The process according to any one of claims 1 to 3, wherein the concentration of the cobalt salt solution in step (1) is 127-132 g/L;
preferably, the concentration of the alkali liquor in the step (1) is 426-440 g/L;
preferably, the concentration of the antioxidant solution in the step (1) is 2.5-5%;
preferably, the cobalt salt in the cobalt salt solution in step (1) comprises any one or a combination of at least two of cobalt chloride, cobalt sulfate or cobalt nitrate, preferably cobalt chloride;
preferably, the lye of step (1) comprises a KOH solution and/or a NaOH solution;
preferably, the antioxidant in the antioxidant solution of step (1) comprises any one or a combination of at least two of hydrazine hydrate, hydroxylamine hydrochloride, ascorbic acid or sodium ascorbate, preferably hydrazine hydrate and/or hydroxylamine hydrochloride.
5. The production method according to any one of claims 1 to 4, wherein the coprecipitation reaction of step (1) is carried out in a reaction vessel;
preferably, the coprecipitation reaction in the step (1) is controlled in temperature by a water cooler;
preferably, before the cobalt salt solution, the alkali liquor and the antioxidant solution are mixed into the base liquor in the step (1), a step of introducing nitrogen and/or inert gas for 30-60min is further included.
6. The preparation method according to any one of claims 1 to 5, wherein after the coprecipitation reaction in step (1) is completed, the co-current addition of the cobalt salt solution, the alkali solution and the antioxidant solution is stopped, and after 200-600mL of the antioxidant solution is added at a time, the aging is performed again;
preferably, the temperature for aging in the step (2) is 40-55 ℃;
preferably, the aging time of the step (2) is 0.8-1.2h, and the stirring speed is 50-200 r/min;
preferably, the post-treatment in the step (2) comprises filter pressing, washing, drying, crushing and iron removal which are sequentially carried out;
preferably, the filter pressing adopts a plate-and-frame filter pressing mode;
preferably, the washing solution comprises an antioxidant solution and pure water in a volume ratio of 1 (400-600);
preferably, the temperature of the washing liquid is 50-70 ℃;
preferably, the washing times are 2-4 times, and after each washing, a filter pressing mode is adopted for solid-liquid separation;
preferably, the time of each washing is 30-90 min;
preferably, the drying temperature is 60-90 ℃, and the drying time is 4-10 h.
7. The production method according to any one of claims 1 to 6, characterized by comprising the steps of:
(1) introducing nitrogen and/or inert gas into a reaction kettle containing pure water for 30-60min, mixing a cobalt salt solution, an alkali liquor and an antioxidant solution into the pure water in a cocurrent flow mode through a metering pump, carrying out coprecipitation reaction for 0.8-1.2h at the temperature of 20-25 ℃ and the stirring speed of 300-600r/min, maintaining the pH of the coprecipitation reaction to be 5-8 within the first 0.3-0.6h, and maintaining the pH of the coprecipitation reaction to be 12.5-13.0 within the later time;
the coprecipitation reaction is carried out in the atmosphere of nitrogen and/or inert gas, wherein the molar ratio of hydroxide ions to cobalt ions is 2.1-3.1, and the volume ratio of antioxidant solution to cobalt salt solution is (0.6-1): 250-350); the concentration of the cobalt salt solution is 132g/L of 127-;
(2) after the coprecipitation reaction in the step (1) is finished, stopping adding a cobalt salt solution, an alkali solution and an antioxidant solution in a parallel flow manner, adding 600mL of 200-fold solution of the antioxidant at one time, aging for 0.8-1.2h in the atmosphere of nitrogen and/or inert gas at the temperature of 40-55 ℃ and at the stirring speed of 50-200r/min, performing plate-and-frame filter pressing after the aging is finished, washing for 2-4 times, performing filter pressing again, drying the obtained particles for 4-10h at the temperature of 60-90 ℃, and crushing and removing iron to obtain the cobalt hydroxide particles;
the washing liquid comprises antioxidant solution and pure water in a volume ratio of 1 (400-600), the temperature of the washing liquid is 50-70 ℃, and the time of each washing is 30-90 min.
8. Cobalt hydroxide particles produced by the production method according to any one of claims 1 to 7.
9. The cobalt hydroxide particles according to claim 8, wherein the particle size D of the cobalt hydroxide particles 50 0.6-1.6 μm, particle diameter D 100 Less than 20 μm;
preferably, the cobalt hydroxide particles have (D) 90 -D 10 )/D 50 1.8 to 1.9;
preferably, the morphology of the cobalt hydroxide particles is regular hexagonal;
preferably, the magnetic foreign matter content of the cobalt hydroxide particles is within 100 ppb.
10. Use of cobalt hydroxide particles according to claim 8 or 9, wherein the use comprises use in a battery material or a catalyst material.
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