CN115196689B - Compound solvent for producing cobaltosic oxide from cobalt-containing positive electrode material of waste lithium battery and use method - Google Patents

Compound solvent for producing cobaltosic oxide from cobalt-containing positive electrode material of waste lithium battery and use method Download PDF

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CN115196689B
CN115196689B CN202211002024.1A CN202211002024A CN115196689B CN 115196689 B CN115196689 B CN 115196689B CN 202211002024 A CN202211002024 A CN 202211002024A CN 115196689 B CN115196689 B CN 115196689B
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compound solvent
cobalt
positive electrode
cobaltosic oxide
electrode material
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CN115196689A (en
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陈智涛
杨旭红
闫旭东
罗小燕
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Wuhan Xuqing Engineering Technology Co ltd
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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
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/54—Reclaiming serviceable parts of waste accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/52—Reclaiming serviceable parts of waste cells or batteries, e.g. recycling
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/03—Particle morphology depicted by an image obtained by SEM
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/84—Recycling of batteries or fuel cells

Abstract

The invention provides a compound solvent for producing cobaltosic oxide by using a cobalt-containing positive electrode material of a waste lithium battery and a use method thereof. Firstly, polyether substances and dicarboxylic acid compounds are mixed under certain conditions to form a compound solvent, then, the waste anode materials and polyether-dicarboxylic acid compound solvent are mixed and stirred, after stirring is finished, cosolvent is added, solid-liquid separation is carried out through centrifugation, and organic acid cobalt purple solid powder is obtained, and further, the powder is subjected to washing, drying, roasting and other operations, so that a cobaltosic oxide product with higher purity can be obtained. The cost of the compound solvent adopted by the invention is controllable, the compound solvent belongs to a high-boiling point and low-volatility anhydrous system, only contains C, H, O elements, does not generate waste water and waste gas in the whole process, and accords with the green development concept.

Description

Compound solvent for producing cobaltosic oxide from cobalt-containing positive electrode material of waste lithium battery and use method
Technical Field
The invention belongs to the technical field of waste lithium ion battery recovery, and particularly relates to a compound solvent for producing cobaltosic oxide from waste cobalt-containing cathode materials and a use method thereof.
Background
The lithium ion battery is widely applied to electric automobiles and mobile electronic equipment. With the use of the lithium ion battery, the charge and discharge performance of the lithium ion battery gradually decreases to be scrapped along with the increase of the service time, and the service life of the lithium ion battery is usually 3-5 years. The waste lithium ion battery cannot be used again, belongs to dangerous waste, cannot be directly discarded, and must be subjected to harmless treatment. In addition, positive electrode materials (e.g., liCoO) in lithium ion batteries 2 ) Contains metallic cobalt (Co) and has higher commercial value. In recent years, the price of metal Co has been continuously increasing. Which is a kind ofIn the process, the price of the cobaltosic oxide (Co content is more than or equal to 72.8 weight percent) existing in the form of oxide breaks through 40 ten thousand yuan/ton. Therefore, the metal Co in the anode material of the waste lithium battery is recovered, so that the waste can be reused, considerable economic benefits can be generated, and the method has important significance.
The traditional recovery method of the waste anode material adopts a hydrometallurgy mode, namely H 2 SO 4 、HCl、HNO 3 And the inorganic acid aqueous solution is used as a leaching agent, and the waste positive electrode material is dissolved by utilizing the strong acidity of the inorganic acid, so that certain recovery efficiency is shown. However, this method inevitably produces a large amount of acid-containing wastewater which is difficult to treat, and such as Cl 2 And NO x Etc. and it is often also necessary to add hydrogen peroxide with explosion risk as a reducing agent. Therefore, the conventional recycling method has problems in terms of green property, safety and the like. In addition, the intermediate product obtained by the traditional method is a metal salt mixture (lithium salt and cobalt salt), the purity is not high, and the intermediate product needs to be further purified by adding a precipitant. And the cobalt salt products such as cobalt sulfate, cobalt chloride and the like have lower value and the price is only Co 3 O 4 About one-fourth of the total amount of Co is difficult to obtain by calcination 3 O 4 And (5) a product. It can be seen that the economic benefits of the conventional method are also limited. In recent years, organic acid systems have been widely studied, mainly including organic acid-water solutions, anhydrous eutectic solvents (DES), and liquid organic acids. The organic acid-water solution system can form organic acid cobalt products, and Co can be obtained by further roasting 3 O 4 And (5) a product. However, the problems of acid-containing wastewater and hydrogen peroxide addition still exist in the organic acid-water solution system, and compared with the traditional method, the problems of greenness, safety and the like of the system are still not solved. DES is a mixture of an organic acid (hydrogen bond donor) and a quaternary ammonium salt (hydrogen bond acceptor), and the liquid solvent formed by the hydrogen bonding between the two has high activity and high boiling point. Compared with water solution, DES can be used under higher temperature condition>The recovery operation is carried out at 100 ℃, so that the leaching efficiency can be further improved. In addition, the intermediate product of DES is also organic acid cobalt, so Co is easy to prepare 3 O 4 And (5) a product. However, DES still has problems. First, choline chloride is a quaternary ammonium salt commonly used in DES, which is hygroscopic and contains chloride ions, causing serious corrosion problems to reinforcement equipment. Secondly, the quaternary ammonium salt contains N atoms, so that N element is also introduced into the obtained intermediate product cobalt organic acid, and the Co is prepared by baking 3 O 4 When releasing NO x Exhaust gas. Furthermore, similar to the conventional process, the DES process also has the intermediate product as a mixture of metal salts, and further purification is also required. Compared with DES, the liquid organic acid only contains C, H, O elements, so that the problems caused by chloride ions and N atoms can be avoided. However, conventional liquid organic acids such as formic acid and acetic acid have insufficient activity, are difficult to leach metallic cobalt, have strong volatility, and do not meet the concept of green development. Compared with the organic acid, the liquid organic acid with high boiling point has more application prospect. Patent (CN 202011484797.9) discloses a method for recycling waste cobalt-containing cathode materials by using polyethylene glycol dicarboxylic acid solvent. Compared with the previous method, the method has remarkable advantages in green property and safety, but the solvent has extremely high price>1000 yuan/liter) and still face the problem of purifying the metal salt mixture, the industrial application of which is still difficult.
In view of the foregoing, for recycling waste cobalt-containing cathode materials, development of a novel, green, efficient, low-cost solvent system and a corresponding method of use is highly desirable.
Disclosure of Invention
The invention aims to solve the technical problems and provides a compound solvent for producing cobaltosic oxide from cobalt-containing positive electrode materials of waste lithium batteries and a use method thereof. The method uses polyether-dicarboxylic acid compound solvent, utilizes the good liquid form and high boiling point characteristic of polyether substance, and adopts an extension main chain (C-C-O) n Or a terminal etherification modification strategy, weakening intermolecular interaction caused by PEG terminal hydroxyl, enabling the dicarboxylic acid compound to be activated at a higher temperature, further playing the reaction capability with metal oxygen and the selective complexing capability with metal Co, and realizing the reaction of dicarboxylic acid and lithium cobaltate and generating an organic cobalt acid complex by only one-step stirringPrecipitating, further washing, drying and roasting the precipitate to obtain Co 3 O 4 And (5) a product.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
mixing polyether substances and dicarboxylic acid compounds for a period of time at a certain temperature to form a compound solvent, mixing and stirring a certain amount of waste anode materials and a certain amount of polyether-dicarboxylic acid compound solvent for a period of time, adding absolute ethyl alcohol as a cosolvent after stirring is finished, and obtaining purple solid precipitate through centrifugal separation. And (3) further washing, drying and roasting the precipitate to obtain the cobaltosic oxide product.
Further, the polyether substance is polyethylene glycol (PEG), polyethylene glycol monomethyl ether (mPEG) or polyethylene glycol dimethyl ether (dmPEG), and the molecular weight of the polyether substance is in the range of 200-1000.
Further, the dicarboxylic acid compound is an organic acid containing terminal groups and a middle carbon chain, both terminal groups are carboxyl groups, and the middle carbon chain is C 1 -C 8 Including malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid.
Further, the polyether-dicarboxylic acid compound solvent is a mixture of polyether substances and dicarboxylic acid compounds, the mixing temperature is 60-100 ℃, and the mixing time is 0.5-2h.
Further, the mass fraction of the dicarboxylic acid compound in the compound solvent is 20-50wt%.
Further, the waste positive electrode material is lithium cobaltate, and the mass ratio of the lithium cobaltate to the compound solvent is 0.005-0.02.
Further, the stirring temperature is 100-150 ℃, the stirring time is 4-12h, and the stirring rotating speed is 600-1000rpm.
Further, the washing adopts excessive absolute ethyl alcohol, the washing temperature is 65 ℃, and the washing time is 1h.
Further, the drying is performed under vacuum, the drying temperature is 80 ℃, and the drying time is 2 hours.
Further, the roasting is performed in an air atmosphere, the roasting temperature is 600 ℃, and the roasting time is 2 hours.
Compared with the prior art, the invention has the following beneficial effects:
(1) The polyether-dicarboxylic acid compound solvent adopted by the invention belongs to an anhydrous system, only contains C, H, O element, has low volatility and lower cost<10 yuan/liter), thereby skillfully avoiding the generation of waste water and waste gas, and having no problems of equipment corrosion, safety risk and high raw material cost; (2) The method utilizes the reaction capability of dicarboxylic acid and metal oxygen and the selective complexing capability of dicarboxylic acid and metal Co, and can obtain the organic acid cobalt precipitate by only one-step stirring operation, so that the method is simple in operation and free from the problem of metal salt mixture; (3) The method can prepare the Co with higher purity by roasting the organic acid cobalt precipitate 3 O 4 The Co content of the product is more than or equal to 72.8wt%.
Drawings
The objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings in which:
FIG. 1 shows a physical diagram of example 1, which contains lithium cobaltate (a), cobalt organate (b) and cobaltosic oxide (c);
fig. 2 shows an SEM image of example 1, comprising lithium cobalt oxide (a), cobalt organic acid (b) and tricobalt tetraoxide (c);
fig. 3 shows the XRD pattern of example 1, comprising lithium cobalt (a), cobalt (b) organic acid and tricobalt tetraoxide (c).
Fig. 4 shows EDS plots of the tricobalt tetraoxide obtained in example 1.
Detailed Description
In order for those of ordinary skill in the art to fully understand the technical solutions and advantages of the present invention, the following description is provided with reference to the accompanying drawings and detailed description. In order to further illustrate the present invention, the following description is provided with reference to the accompanying drawings and examples, which are not to be construed as limiting the scope of the present invention.
Example 1
mPEG500 was mixed with adipic acid at 60 ℃ for 2 hours to prepare a mPEG-adipic acid complex solvent containing 20 wt%. Adding lithium cobalt oxide black powder with the mass ratio of 0.02 into the compound solvent, and stirring for 8 hours at 120 ℃ at the stirring speed of 900rpm. Subsequently, absolute ethanol was added, and subjected to centrifugation to obtain cobalt adipate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide. The physical appearance of lithium cobaltate, cobalt adipate and tricobalt tetraoxide is shown in fig. 1.
Example 2
PEG1000 was mixed with adipic acid at 80℃for 0.5h to prepare a PEG-adipic acid complex solvent containing 20 wt%. Adding lithium cobalt oxide black powder with the mass ratio of 0.005 into the compound solvent, stirring for 12 hours at 150 ℃, and then stirring at 600rpm. Subsequently, absolute ethanol was added, and subjected to centrifugation to obtain cobalt adipate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 3
mPEG500 was mixed with adipic acid at 100 ℃ for 1h to prepare a mPEG-adipic acid complex solvent containing 50wt%. Adding lithium cobalt oxide black powder with the mass ratio of 0.01 into the compound solvent, and stirring for 4 hours at 130 ℃ at the stirring speed of 600rpm. Subsequently, absolute ethanol was added, and subjected to centrifugation to obtain cobalt adipate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 4
dmPEG250 was mixed with adipic acid at 100deg.C for 0.5h to prepare a dmPEG-adipic acid complexing solvent containing 20 wt%. Adding lithium cobalt oxide black powder with the mass ratio of 0.005 into the compound solvent, and stirring for 12 hours at 130 ℃ at the stirring speed of 900rpm. Subsequently, absolute ethanol was added, and subjected to centrifugation to obtain cobalt adipate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 5
The mPEG500 and succinic acid are mixed for 1h at 60 ℃ to prepare the mPEG-succinic acid compound solvent containing 50wt%. Adding lithium cobalt oxide black powder with the mass ratio of 0.005 into the compound solvent, stirring for 12 hours at 110 ℃, and then stirring at 900rpm. Then, absolute ethyl alcohol is added, and cobalt succinate purple powder is obtained through centrifugal operation. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 6
mPEG500 and glutaric acid are mixed for 2 hours at 80 ℃ to prepare a compound solvent containing 20wt% of mPEG-glutaric acid. Adding lithium cobalt oxide black powder with the mass ratio of 0.005 into the compound solvent, and stirring for 10 hours at 130 ℃ at the stirring speed of 900rpm. Subsequently, absolute ethanol was added, and the mixture was centrifuged to obtain cobalt glutarate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 7
The dmPEG250 and suberic acid were mixed at 100℃for 1 hour to prepare a dmPEG-suberic acid complex solvent containing 20% by weight. Adding lithium cobalt oxide black powder with the mass ratio of 0.01 into the compound solvent, and stirring for 10 hours at 130 ℃ and then setting the stirring speed to 900rpm. Subsequently, absolute ethanol was added, and the mixture was centrifuged to obtain cobalt suberate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 8
The dmPEG250 and the sebacic acid are mixed for 1h at 100 ℃ to prepare a dmPEG-sebacic acid compound solvent containing 30 weight percent. Adding lithium cobalt oxide black powder with the mass ratio of 0.01 into the compound solvent, and stirring for 12 hours at 130 ℃ at the stirring speed of 900rpm. Subsequently, absolute ethanol was added, and subjected to centrifugation to obtain cobalt sebacate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 9
PEG1000 and malonic acid were mixed at 60℃for 1 hour to prepare a PEG-malonic acid complex solvent containing 20 wt%. Adding lithium cobalt oxide black powder with the mass ratio of 0.005 into the compound solvent, stirring for 12 hours at 110 ℃, and then stirring at 900rpm. Subsequently, absolute ethanol was added, and the mixture was centrifuged to obtain cobalt malonate powder. The powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Example 10
PEG1000 was mixed with azelaic acid at 100deg.C for 1h to prepare a PEG-azelaic acid complex solvent containing 20 wt%. Adding lithium cobalt oxide black powder with the mass ratio of 0.02 into the compound solvent, stirring for 12 hours at 130 ℃, and then stirring at 900rpm. Subsequently, absolute ethanol was added, and the mixture was subjected to centrifugation to obtain cobalt malonate purple powder. The purple powder was dried in vacuo at 80℃for 2 hours and calcined at 600℃for 1 hour in an air atmosphere to give a black powder of tricobalt tetraoxide.
Performance testing
Test example 1
SEM tests were performed on three powders of lithium cobaltate, cobalt adipate and tricobalt tetraoxide in example 1, as shown in fig. 2. It can be observed that lithium cobaltate is a micron-sized particle; after the reaction with adipic acid, the particle size of the particles is greatly reduced, and the microscopic morphology of the generated cobalt adipate is a three-dimensional structure formed by stacking nanoscale particles; after roasting, the microcosmic appearance of the prepared cobaltosic oxide is a sheet structure formed by agglomeration of nano particles.
Test example 2
XRD tests were performed on three powders of lithium cobaltate, cobalt adipate and tricobalt tetraoxide in example 1, as shown in fig. 3. It can be seen that the peak position and the peak intensity of the XRD pattern are greatly changed before and after the reaction with adipic acid, and the obtained product is tricobalt tetraoxide after roasting.
Test example 3
EDS test was performed on the tricobalt tetraoxide powder obtained in example 1, as shown in fig. 3. As can be seen from the figure, the cobaltosic oxide powder contains only two elements of Co and O, wherein the Co content is 73.08 +/-0.19 wt%. It can be seen that the product obtained in example 1 is a tricobalt tetraoxide product with a higher purity.

Claims (7)

1. The application method of the compound solvent for producing the cobaltosic oxide by using the cobalt-containing positive electrode material of the waste lithium battery is characterized by comprising the following steps of: mixing polyether substances and dicarboxylic acid compounds for a period of time at a certain temperature to form a compound solvent, mixing and stirring a certain amount of waste anode materials and a certain amount of polyether-dicarboxylic acid compound solvent for a period of time, adding absolute ethyl alcohol as a cosolvent after stirring is finished, obtaining purple solid precipitate through centrifugal separation, further washing, drying and roasting the precipitate to obtain a cobaltosic oxide product, wherein the polyether substances are polyethylene glycol monomethyl ether (mPEG) and polyethylene glycol dimethyl ether (dmPEG), the molecular weight of the polyether substances is in the range of 200-1000, the dicarboxylic acid compounds are organic acids containing terminal groups and intermediate carbon chains, the two terminal groups are carboxyl groups, the intermediate carbon chains are C1-C8, the stirring temperature is 100-150 ℃, the stirring time is 4-12h, and the stirring speed is 600-1000rpm.
2. The use method of the compound solvent for producing cobaltosic oxide from the cobalt-containing positive electrode material of the waste lithium battery, which is disclosed in claim 1, is characterized in that: the polyether-dicarboxylic acid compound solvent is a mixture of polyether substances and dicarboxylic acid compounds, the mixing temperature is 60-100 ℃, and the mixing time is 0.5-2h.
3. The use method of the compound solvent for producing cobaltosic oxide from the cobalt-containing positive electrode material of the waste lithium battery, which is disclosed in claim 1, is characterized in that: the mass fraction of the dicarboxylic acid compound in the compound solvent is 20-50wt%.
4. The use method of the compound solvent for producing cobaltosic oxide from the cobalt-containing positive electrode material of the waste lithium battery, which is disclosed in claim 1, is characterized in that: the waste positive electrode material is lithium cobaltate, and the mass ratio of the lithium cobaltate to the compound solvent is 0.005-0.02.
5. The use method of the compound solvent for producing cobaltosic oxide from the cobalt-containing positive electrode material of the waste lithium battery, which is disclosed in claim 1, is characterized in that: the washing adopts excessive absolute ethyl alcohol, the washing temperature is 65 ℃, and the washing time is 1h.
6. The use method of the compound solvent for producing cobaltosic oxide from the cobalt-containing positive electrode material of the waste lithium battery, which is disclosed in claim 1, is characterized in that: the drying is carried out under vacuum condition, the drying temperature is 80 ℃, and the drying time is 2 hours.
7. The use method of the compound solvent for producing cobaltosic oxide from the cobalt-containing positive electrode material of the waste lithium battery, which is disclosed in claim 1, is characterized in that: the roasting is carried out in an air atmosphere, the roasting temperature is 600 ℃, and the roasting time is 2 hours.
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