CN113800572B - Surface-compact internal loose cobalt oxyhydroxide and preparation method thereof - Google Patents
Surface-compact internal loose cobalt oxyhydroxide and preparation method thereof Download PDFInfo
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Abstract
Cobalt oxyhydroxide with compact surface and loose interior and preparation method thereof, wherein cobalt oxyhydroxide is Co x Al y OOH, x is more than or equal to 0.98 and less than 1, y is more than or equal to 0 and less than 0.02, and x+y=1; the D50 is 3.5-6.5 um, and the granularity diameter distance is 0.6 < (D90-D10)/D50 is less than 0.8. The preparation method comprises the following steps: 1. preparing a mixed salt solution of sodium hexanitrocobalt (III) acid and acetic acid, and preparing a sodium hydroxide or potassium hydroxide solution as a precipitant; preparing a mixed solution of a complexing agent, meta-aluminate and an additive; 2. adding a precipitator, pure water and a complexing agent into a synthesis kettle to prepare a base solution; the concentration of the complexing agent in the base solution is 0.01-0.20 mol/L; controlling the pH value of the base solution to be 9.80-11.40 through a precipitator; 3. stirring and introducing nitrogen, and continuously adding the mixed salt solution, the mixed solution and the precipitant to carry out coprecipitation reaction; the overflow liquid flows to a concentration machine, and liquid feeding is stopped when the slurry grows to the target granularity; 4. transferring the slurry to an aging tank, adding a precipitant to adjust the pH to 12.00-13.00, and aging for at least 4 hours; 5. and carrying out filter pressing, washing and drying on the slurry of the ageing tank to obtain a product. The product has compact surface and loose inside, and has high consistency.
Description
Technical Field
The invention relates to the technical field of lithium ion battery anode materials, in particular to cobalt oxyhydroxide with compact surface and loose inside and a preparation method thereof.
Background
As one of basic raw materials for producing lithium cobaltate, the cobalt oxyhydroxide can be used for preparing various cobalt compounds and can also be used for preparing lithium cobaltate serving as a positive electrode material of a lithium ion battery with good electrochemical performance. In addition, the cobalt oxyhydroxide can also be used as an additive of a lithium ion battery, and can obviously improve the cycle and the rate performance of the lithium ion battery. Therefore, the cobalt oxyhydroxide has a relatively high development prospect, and is particularly applied to the aspect of positive electrode materials of lithium ion batteries.
The cobalt oxyhydroxide is generally prepared by adopting a liquid phase coprecipitation method, and the method is simple to operate and suitable for large-scale production. When preparing cobalt oxyhydroxide by coprecipitation, a few oxidants are usually added to Co 2+ Oxidation to Co 3+ As in patent application 201510152081.1, a method for preparing cobalt oxyhydroxide is disclosed, in which cobalt oxyhydroxide is directly synthesized by adding an oxidizing agent during coprecipitation. In addition, patent application 201110327857.0 discloses a method for producing lithium cobaltate by preparing cobalt oxyhydroxide by wet chemical reaction, which comprises the steps of synthesizing cobalt hydroxide, oxidizing the cobalt hydroxide into trivalent cobalt hydroxide by sodium hypochlorite, and finally preparing lithium cobaltate by sintering. In the case of the method of producing cobalt oxyhydroxide by the above-disclosed method, since the addition amount of the oxidizing agent is difficult to control, the addition of the oxidizing agent during the synthesis or in cobalt hydroxide causes non-uniformity of the reaction, resulting in deterioration of product consistency.
Therefore, how to solve the above-mentioned drawbacks of the prior art is a subject to be studied and solved by the present invention.
Disclosure of Invention
The invention aims to provide a cobalt oxyhydroxide with compact surface and loose interior and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
cobalt oxyhydroxide with compact surface and loose inside and chemical formula of Co x Al y OOH, wherein 0.98 is equal to or less than x < 1,0 is equal to or less than y < 0.02, and x+y=1; the D50 is 3.5-6.5 um, and the granularity diameter distance is 0.6 < (D90-D10)/D50 is less than 0.8.
In order to achieve the purpose, the technical scheme adopted in the method level of the invention is as follows:
a preparation method of surface-dense internal loose cobalt oxyhydroxide comprises the following steps:
preparing a mixed salt solution of sodium hexanitrocobaltate (III) and acetic acid, wherein the total molar concentration of the sodium hexanitrocobaltate (III) in the mixed salt solution is 2.0-2.5 mol/L, and the concentration of the acetic acid is 0.0001-0.0005 mol/L;
preparing sodium hydroxide or potassium hydroxide solution as a precipitator;
preparing a mixed solution of a complexing agent, meta-aluminate and an additive, wherein the molar concentration of the complexing agent in the mixed solution is 0.15-0.65 mol/L, the molar concentration of the meta-aluminate is 0.01-0.04 mol/L, and the mass percentage of the additive is 0.05-0.15%; the pH value of the mixed solution is 11.95-12.15;
step two, adding the precipitant, pure water and the complexing agent into a closed synthesis kettle to prepare base solution, and filling the synthesis kettle with the base solution;
wherein the concentration of the complexing agent in the base solution is 0.01-0.20 mol/L;
controlling the pH value of the base solution to be 9.80-11.40 through the precipitator, wherein the temperature of the base solution is 55-75 ℃;
step three, keeping stirring of the synthesis kettle open, and introducing nitrogen or inert gas into the synthesis kettle at a flow rate of 0.4-0.8 m 3 /h；
Continuously adding the mixed salt solution, the mixed solution and the precipitant in the first step into a synthesis kettle at a flow rate of 400-800L/h for coprecipitation reaction;
the overflow liquid of the synthesis kettle flows to the concentration machine, and liquid feeding is stopped when the granularity D50 of slurry in the synthesis kettle grows to 3.5-6.5 um;
step four, transferring all the slurry in the synthesis kettle and the concentration machine to an ageing tank, adding the precipitant into the ageing tank, adjusting the pH value to 12.00-13.00, controlling the temperature in the ageing tank to be 55-75 ℃ and ageing for at least 4 hours;
and step five, carrying out filter pressing, washing and drying on the ageing tank slurry obtained in the step four to obtain the cobalt oxyhydroxide with compact surface and loose inside.
The relevant content explanation in the technical scheme is as follows:
1. in the above scheme, in the first step, the precipitant may be sodium hydroxide or potassium hydroxide solution with a mass fraction of 20-40%.
2. In the above scheme, in the first step, the complexing agent is one or more of sodium ethylenediamine tetraacetate, sodium diethylamine pentaacetate, sodium N-hydroxyethyl ethylenediamine triacetate, and sodium cyclohexane diamine tetraacetate.
3. In the above scheme, in the first step, the meta-aluminate is one or more of sodium meta-aluminate, potassium meta-aluminate and ammonium meta-aluminate.
4. In the above scheme, in the first step, the additive is one or more of sodium methylcellulose, sodium carboxymethylcellulose, sodium propylcellulose and sodium ethylcellulose.
5. In the scheme, the second step provides a relatively stable environment for initial nucleation of the cobalt oxyhydroxide.
6. In the above scheme, in the third step, the specific input relation of the mixed salt solution and the mixed solution is not limited, and the molar ratio of the Co element to the Al element in the cobalt oxyhydroxide as the final product of the present invention is based on. That is, 0.98.ltoreq.x < 1,0 < y < 0.02, and x+y=1.
7. In the scheme, in the fourth step, the pH is adjusted to 12.00-13.00, and the pH of the aging tank is adjusted to age, so that the trace Co in the slurry is promoted 3+ And (3) complete precipitation.
8. In the above scheme, in the fourth step, the aging time is not less than 4 hours to ensure Co in the slurry 3+ And (3) complete precipitation.
9. In the scheme, in the third step, the pH value in the synthesis kettle is controlled to be 9.80-11.40 through the precipitant, the reaction temperature in the synthesis kettle is 55-75 ℃, the rotating speed of the synthesis kettle is 400-600 r/min, the concentration of the complexing agent in slurry in the synthesis kettle is 0.01-0.20 mol/L, and the mass percentage of the additive in the slurry in the synthesis kettle is 0.01-0.08%.
The working principle and the advantages of the invention are as follows:
1. the invention introduces Co by using sodium hexanitrocobalt (III) acid 3+ The cobalt oxyhydroxide with compact surface and loose interior is prepared through coprecipitation reaction, an oxidant is not needed to be added in the process, and the consistency of the obtained product is high;
2. according to the invention, the water-soluble meta-aluminate is added into the complexing agent, so that Co and Al elements are uniformly precipitated, and the cobalt oxyhydroxide with compact surface and loose inside of uniform ginseng-aluminum is prepared;
3. according to the invention, a proper amount of additive is added, and the additive is one or more of sodium methylcellulose, sodium carboxymethylcellulose, sodium propylcellulose and sodium ethylcellulose, so that the addition of the additive can well prevent adhesion among cobalt oxyhydroxide particles and increase gaps among primary particles in the cobalt oxyhydroxide particles, thereby being beneficial to preparing an internal loose structure of the cobalt oxyhydroxide;
4. the invention prepares the cobalt oxyhydroxide with compact surface and loose inside by controlling the addition amount of the additive and the reaction process conditions.
Drawings
FIG. 1A is an electron microscope image of cobalt oxyhydroxide prepared in example 1 of the present invention;
FIG. 1B is a cross-sectional electron micrograph of the cobalt oxyhydroxide prepared in example 1 of the present invention;
FIG. 1C is an elemental surface profile of cobalt oxyhydroxide prepared in example 1 of the present invention;
FIG. 2 is an electron micrograph of the cobalt oxyhydroxide prepared in comparative example 1 of the present invention;
FIG. 3 is an electron microscopic image of the cobalt oxyhydroxide prepared in comparative example 2 of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples:
the following detailed description will clearly illustrate the present invention, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the technology taught herein without departing from the spirit and scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure.
The term (terms) as used herein generally has the ordinary meaning of each term as used in this field, in this disclosure, and in the special context, unless otherwise noted. Certain terms used to describe the present disclosure are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in connection with the description herein.
Example 1:
the surface-compact internal loose cobalt oxyhydroxide and the preparation method thereof sequentially comprise the following steps:
preparing a mixed salt solution of sodium hexanitrocobalt (III) acid and acetic acid, wherein the concentration of Co in the mixed salt solution is 2.0 mol/L, and the concentration of acetic acid is 0.0002mol/L; preparing 32% sodium hydroxide or potassium hydroxide solution as a precipitant; preparing a mixed solution of 0.26mol/L of cyclohexane diamine tetraacetic acid, 0.04mol/L of sodium metaaluminate and 0.1% of methyl cellulose sodium, wherein the pH value of the mixed solution is 11.95-12.15.
And step two, adding sodium hydroxide or potassium hydroxide solution, sodium methylcellulose, pure water and cyclohexanediamine sodium tetraacetate into a closed synthesis kettle to prepare base solution, wherein the concentration of the sodium methylcellulose in the base solution is 0.04%, the concentration of a complexing agent in the base solution is 0.08moL/L, the pH value of the base solution is 9.80-11.40, and the temperature is 60 ℃. The bottom liquid is filled in the synthesis kettle.
And thirdly, keeping stirring of the synthesis kettle open, introducing nitrogen at a flow rate of 400-800L/h, continuously adding the mixed salt solution and the mixed solution in the first step into the synthesis kettle respectively at a flow rate of 800mL/min and 400mL/min and a mode of automatically adjusting the flow rate of a precipitant according to an actual pH value to carry out coprecipitation reaction, wherein the pH value of the synthesis kettle is kept at 9.80-11.40, the reaction temperature is kept at 60 ℃, the rotating speed of the synthesis kettle is 400-600 r/min, the concentration of a complexing agent in slurry in the synthesis kettle is 0.08mol/L, and the concentration of methyl cellulose sodium in slurry in the synthesis kettle is 0.04%.
Overflow liquid of the synthesis kettle flows to a concentration machine, and the granularity D50 of the synthesis kettle grows to 3.5-6.5um, particle size diameter is 0.60 < (D90 1 -D10 1 ）/D50 1 And stopping feeding liquid when the pressure is less than 0.80.
Step four, transferring all the slurry of the synthesis kettle and the concentration machine into an ageing tank, adding the sodium hydroxide or potassium hydroxide solution into the ageing tank, regulating the pH value to 12.00-13.00, controlling the temperature in the ageing tank to be 60 ℃, and ageing for 5 hours;
step five, the ageing tank slurry in the step four is subjected to filter pressing, washing and drying to obtain cobalt oxyhydroxide with compact surface and loose inside, and the chemical formula of the product is Co 0.99 Al 0.01 OOH, D50 of 5.675 um, particle size diameter of 0.758, and related data can be seen in table 1.
Comparative example 1:
the difference from example 1 is that the concentration of sodium methylcellulose in the mixed solution in the first step is different, sodium methylcellulose is not added in this comparative example, and the rest is the same as in example 1. The cobalt oxyhydroxide obtained was washed and dried, and the data are shown in Table 1.
Comparative example 2:
the difference from example 1 is that the concentration of methylcellulose sodium in the mixed solution in the first step is different, the concentration of methylcellulose sodium in this comparative example is 3%, and the rest is the same as in example 1. The cobalt oxyhydroxide obtained was washed and dried, and the data are shown in Table 1.
Sample particle size data in Table 1, example 1 and each comparative example
TABLE 1
As can be seen from the data of example 1 and each comparative example in table 1: under otherwise identical conditions, the concentration of sodium methylcellulose has no effect on the particle size D50 of the final product. However, as the concentration of sodium methylcellulose increases, the particle size diameter of the product gradually widens, which means that sodium methylcellulose can effectively prevent inter-particle adhesion and has a dispersing effect.
FIGS. 1A, 1B, 1C, 2And FIG. 3 is Co prepared in example 1, comparative example 1 and comparative example 2, respectively 0.99 Al 0.01 The electron microscope image, the cross-section electron microscope image and the element surface distribution image of the OOH show that the addition of a proper amount of sodium methylcellulose in the synthesis process can effectively increase the pores in the cobalt oxyhydroxide and the surface is smooth and compact. The surface of the cobalt oxyhydroxide prepared by adding no sodium methylcellulose is loose, while the surface of the cobalt oxyhydroxide prepared by adding excessive sodium methylcellulose is loose, and the uniformity of the morphology is poor. As can be seen from the element surface distribution diagram, co and Al are mutually overlapped and uniformly distributed.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (4)
1. A preparation method of surface-dense internal loose cobalt oxyhydroxide is characterized by comprising the following steps: the method comprises the following steps:
preparing a mixed salt solution of sodium hexanitrocobaltate (III) and acetic acid, wherein the total molar concentration of the sodium hexanitrocobaltate (III) in the mixed salt solution is 2.0-2.5 mol/L, and the concentration of the acetic acid is 0.0001-0.0005 mol/L;
preparing sodium hydroxide or potassium hydroxide solution as a precipitator;
preparing a mixed solution of a complexing agent, meta-aluminate and an additive, wherein the molar concentration of the complexing agent in the mixed solution is 0.15-0.65 mol/L, the molar concentration of the meta-aluminate is 0.01-0.04 mol/L, and the mass percentage of the additive is 0.05-0.15%; the pH value of the mixed solution is 11.95-12.15;
the additive is one or more of sodium methylcellulose and sodium carboxymethylcellulose;
step two, adding the precipitant, pure water and the complexing agent into a closed synthesis kettle to prepare base solution, and filling the synthesis kettle with the base solution;
wherein the concentration of the complexing agent in the base solution is 0.01-0.20 mol/L;
controlling the pH value of the base solution to be 9.80-11.40 through the precipitator, wherein the temperature of the base solution is 55-75 ℃;
step three, keeping stirring of the synthesis kettle open, and introducing nitrogen or inert gas into the synthesis kettle at a flow rate of 0.4-0.8 m 3 /h；
Continuously adding the mixed salt solution, the mixed solution and the precipitant in the first step into a synthesis kettle at a flow rate of 400-800L/h for coprecipitation reaction;
the overflow liquid of the synthesis kettle flows to the concentration machine, and liquid feeding is stopped when the granularity D50 of slurry in the synthesis kettle grows to 3.5-6.5 um;
step four, transferring all the slurry in the synthesis kettle and the concentration machine to an ageing tank, adding the precipitant into the ageing tank, adjusting the pH value to 12.00-13.00, controlling the temperature in the ageing tank to be 55-75 ℃ and ageing for at least 4 hours;
step five, carrying out filter pressing, washing and drying on the ageing tank slurry obtained in the step four to obtain cobalt oxyhydroxide with compact surface and loose interior;
in the fifth step, the surface-densified internal-loose cobalt oxyhydroxide has the chemical formula of Co x Al y OOH, wherein 0.98 is equal to or less than x < 1,0 is equal to or less than y < 0.02, and x+y=1; the D50 is 3.5-6.5 um, and the granularity diameter distance is 0.6 < (D90-D10)/D50 is less than 0.8.
2. The method of manufacturing according to claim 1, characterized in that: in the first step, the complexing agent is one or more of sodium ethylenediamine tetraacetate, sodium diethylamine pentaacetate, sodium N-hydroxyethyl ethylenediamine triacetate and sodium cyclohexane diamine tetraacetate.
3. The method of manufacturing according to claim 1, characterized in that: in the first step, the meta-aluminate is one or more of sodium meta-aluminate, potassium meta-aluminate and ammonium meta-aluminate.
4. The method of manufacturing according to claim 1, characterized in that: in the third step, the pH value in the synthesis kettle is controlled to be 9.80-11.40 through the precipitant, the reaction temperature in the synthesis kettle is 55-75 ℃, the rotation speed of the synthesis kettle is 400-600 r/min, the concentration of the complexing agent in the slurry in the synthesis kettle is 0.01-0.20 mol/L, and the mass percentage of the additive in the slurry in the synthesis kettle is 0.01-0.08%.
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| JP2006298699A (en) * | 2005-04-20 | 2006-11-02 | Seimi Chem Co Ltd | Method for manufacturing lithium cobalt composite oxide having large particle size |
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| CN113003613A (en) * | 2019-12-19 | 2021-06-22 | 格林美（江苏）钴业股份有限公司 | Preparation method of 2-4 mu m battery grade cobalt tetroxide |
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| JP2006298699A (en) * | 2005-04-20 | 2006-11-02 | Seimi Chem Co Ltd | Method for manufacturing lithium cobalt composite oxide having large particle size |
| CN103904323A (en) * | 2012-12-28 | 2014-07-02 | 北京当升材料科技股份有限公司 | Preparation method for spherical cobalt oxyhydroxide |
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