CN114180636A - Lithium manganese material in lithium ion battery anode waste material and stripping and recycling method thereof - Google Patents
Lithium manganese material in lithium ion battery anode waste material and stripping and recycling method thereof Download PDFInfo
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- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G45/00—Compounds of manganese
- C01G45/12—Manganates manganites or permanganates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- 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
- C01P2006/40—Electric properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- 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
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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- 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 relates to the technical field of lithium ion batteries, in particular to a lithium manganese material in lithium ion battery anode waste and a stripping and recycling method thereof, wherein the lithium manganese material is prepared by the following steps: crushing the lithium ion battery anode waste, placing the crushed lithium ion battery anode waste in distilled water, stirring and stripping at a required temperature, roughly filtering the solution after stripping, and removing aluminum foil; and filtering the filtrate after coarse filtration by using filter paper, and drying the filter residue after filtration to obtain the lithium manganate material. According to the method for stripping the lithium manganate material in the lithium ion battery positive electrode waste material, the higher stripping rate can be obtained, and the obtained lithium manganate material is calcined to obtain lithium manganate crystals with good crystallinity which can be directly used as the lithium ion battery positive electrode material. The stripping process does not need to use other complex toxic and harmful reagents, does not cause any harm to the environment, has high electrochemical capacity of the final material and good circulation stability, and effectively reduces the waste of resources and environmental pollution.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium manganese material in lithium ion battery anode waste and a stripping and recycling method thereof.
Background
Resource shortage and environmental pollution are becoming key problems threatening human survival and sustainable development increasingly, the number of per capita resources in China is small, the resource development and utilization level is low, the pollution to the environment is obvious, and the resource and environmental pressure is higher than that of other countries. In the 21 st century, human beings must reasonably coordinate the relationship among human beings, resources, environments and development and take a way of sustainable development. Lithium ion batteries are considered to be a class of current sustainable clean energy that can greatly alleviate energy crisis and environmental problems, and are widely used in the fields of a large number of consumer electronics products, hybrid electric vehicles, and renewable energy due to their high energy density and excellent cycle stability. However, the life of the lithium ion battery is only 3 to 5 years due to the corrosion of the inside of the battery, and the direct disposal of the waste battery results in huge resource waste and environmental pollution. At present, with the end of the service life of the previous batches of lithium ion batteries, the discarded batteries have serious impact on the environment and human health. In addition, with the large-scale exploitation of precious metals, such resources will be exhausted soon in the near future, which means that the recovery and utilization of waste lithium ion batteries face huge opportunities. Therefore, the development and design of the recovery process of the waste lithium ion battery are urgent, and a good recovery technology is helpful for reducing the production cost of battery manufacturers and reducing the environmental pollution.
Among various components of waste lithium ion batteries, the existence of a large amount of noble metals causes the positive electrode material to account for about 36% of the cost of the whole battery system, so the key for improving the utilization rate of the waste batteries is how to recover and utilize the positive electrode material. The current common anode material recovery strategy mainly focuses on improving the utilization rate of the noble metal, and comprises two stages of recovery and reutilization. Of the many processes, pyrometallurgical and hydrometallurgical processes are considered to be classical processes of traditional recovery processes, which are capable of recovering precious metals very well. The pyrometallurgical method is to calcine the waste anode material at high temperature, burn off the organic binder and conductive agent, and obtain valuable metals through multi-step purification and separation processes. Pyrometallurgy, while a simple type of recovery process, has significant disadvantages such as high energy consumption, hazardous pollutant emissions, and low purity end products. In hydrometallurgical processes, acid or base stripping and subsequent purification is used, followed by solution chemistry to obtain a high purity product. Although the hydrometallurgical process overcomes some of the disadvantages compared to pyrometallurgy, it still requires complex steps, large consumption of organic solvents and emission of toxic substances. Since both pyrometallurgical and hydrometallurgical techniques destroy the structure and morphology of the positive electrode material, there has been a strong interest in recent years in techniques for direct recovery of positive electrode materials by non-destructive processes. For example, the positive electrode scrap collected from the electrode plate is treated by a solid state sintering process in order to regenerate the positive electrode active material to its original structure. In common recycling, the control of the impurity content and the maintenance of the positive electrode structure are crucial to subsequent circulation, and high-temperature calcination and organic solvent dissolution can damage the positive electrode structure and are not suitable for subsequent recycling and environmental protection of battery manufacturers. Recently, researchers have adopted different organic solvents (such as polymethyl pyrrolidone, formamide and acetamide) to dissolve the battery waste, so as to effectively realize the stripping of the positive electrode waste, however, the use of these expensive organic reagents consumes a large amount of resources on one hand, and causes great pollution to the environment on the other hand. The large consumption of these solvents in industrial production not only increases the economic cost, but also poses a certain threat to human health. How to effectively strip the positive electrode waste material by a simple, efficient and nontoxic method is urgent.
Disclosure of Invention
The invention provides a lithium manganese acid material in lithium ion battery anode waste and a stripping and recycling method thereof, overcomes the defects of the prior art, and can effectively solve the problems of stripping resource consumption and environmental pollution of the prior anode waste.
One of the technical schemes of the invention is realized by the following measures: a method for stripping a lithium manganese acid material in lithium ion battery anode waste materials comprises the following steps: placing the crushed lithium ion battery anode waste into distilled water, stirring and stripping at a required temperature, performing coarse filtration on a mixed solution obtained after stripping, and removing aluminum foil to obtain a coarse filtrate, wherein the amount of distilled water corresponding to each 1 g of lithium ion battery anode waste is 20-60 ml, so as to ensure that the distilled water completely soaks the lithium ion battery anode waste; and secondly, filtering the filtrate after coarse filtration by using filter paper, and drying the filter residue after filtration to obtain the lithium manganate material stripped from the lithium ion battery anode waste.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
in the first step, the stirring temperature is 40 ℃ to 100 ℃, the stirring speed is 0r/min to 1000r/min, and the stirring time is 2h to 8 h.
In the first step, the stirring is carried out under ultrasonic conditions.
The stirring time under the ultrasonic condition is 10min to 120min, the stirring temperature is 40 ℃ to 100 ℃, and the stirring speed is 0r/min to 1000 r/min.
In the first step, the lithium ion battery anode waste is crushed into round pieces with the diameter of 1cm to 5 cm.
In the first step, the waste material of the positive electrode of the lithium ion battery is crushed into 2cm round pieces.
The second technical scheme of the invention is realized by the following measures: the lithium manganate material is obtained by implementing the stripping method of the lithium manganate material in the lithium ion battery positive electrode waste material.
The third technical scheme of the invention is realized by the following measures: a method for recycling a lithium manganate material comprises the following steps:
firstly, calcining a lithium manganate material to obtain a lithium manganate crystal; secondly, mixing the lithium manganate crystal, acetylene black and polymethyl pyrrolidone according to a required proportion, grinding the mixture in a mortar, and then coating the mixture on a fresh aluminum foil; and thirdly, drying the coated aluminum foil in a drying oven at 120 ℃ for 12-24 h, and cutting the aluminum foil into a positive plate by using a cutting machine to obtain the lithium manganate positive electrode material.
The following is further optimization or/and improvement of the second technical scheme of the invention:
in the first step, the calcining temperature is 500-900 ℃, and the calcining time is 8-14 h.
In the second step, the mass ratio of the lithium manganate crystal to the acetylene black to the polymethyl pyrrolidone is 8:1:1, and the grinding time is 15min to 30 min.
According to the method for stripping the lithium manganate material in the lithium ion battery positive electrode waste material, the higher stripping rate can be obtained, the obtained lithium manganate material is calcined to obtain the lithium manganate crystal with good crystallinity which can be directly used as the lithium ion battery positive electrode material, other complex toxic and harmful reagents are not needed in the stripping process, no harm is caused to the environment, the final material is high in electrochemical capacity and good in circulation stability, and the waste of resources and the environmental pollution are effectively reduced.
Drawings
FIG. 1 shows the influence of different factors on the stripping rate in the stripping process of the lithium manganate positive electrode waste material.
FIG. 2 is a comparison graph of infrared spectra of a lithium manganate material stripped in the present invention before and after calcination.
FIG. 3 is a charge-discharge curve diagram and a cycle life diagram of a lithium manganate positive electrode material which is stripped and reused in the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemical articles mentioned in the invention are all the chemical reagents and chemical articles which are well known and commonly used in the prior art, unless otherwise specified; the percentages in the invention are mass percentages unless otherwise specified; the solution in the present invention is an aqueous solution in which the solvent is water, for example, a hydrochloric acid solution is an aqueous hydrochloric acid solution, unless otherwise specified; the normal temperature and room temperature in the present invention generally mean a temperature of 15 ℃ to 25 ℃, and are generally defined as 25 ℃.
The invention is further described below with reference to the following examples:
example 1: the stripping method of the lithium manganese oxide material in the lithium ion battery anode waste material comprises the following steps:
placing the crushed lithium ion battery anode waste into distilled water, stirring and stripping at a required temperature, performing coarse filtration on a mixed solution obtained after stripping, and removing aluminum foil to obtain a coarse filtrate, wherein the amount of distilled water corresponding to each 1 g of lithium ion battery anode waste is 20-60 ml, so as to ensure that the distilled water completely soaks the lithium ion battery anode waste; and secondly, filtering the filtrate after coarse filtration by using filter paper, and drying the filter residue after filtration to obtain the lithium manganate material stripped from the lithium ion battery anode waste.
The drying in the invention is drying for 2h to 12h at 100 ℃ to 110 ℃.
The method takes water as a single solvent to effectively strip and directly recycle the lithium manganate anode waste, and is characterized in that the water is taken as the solvent to directly strip and recycle the anode waste. The water is used as a green separation medium, and the structure of the anode material cannot be damaged in the whole stripping process, so that the stability of the material structure in subsequent reuse is maintained. According to the technical scheme, the lithium manganate, the polyvinylidene fluoride and the acetylene black in the cathode material can be effectively stripped, so that the recyclable lithium manganate material is obtained.
During stripping, vaporization centers are formed inside the positive electrode waste due to the mechanical action of stirring and the cavitation action, and the formation of the vaporization centers reduces the compactness of the material and increases the porosity. Thus, water molecules are easier to penetrate into the electrode waste, which causes the lithium remained in the material to be dissolved, and simultaneously, a high alkaline environment is formed on the compact electrode surface, and the layer isThe alkaline film can make the current collector contact with the active particles in the external environment, so that the passivation layer can obtain Al2O3Can form soluble lithium metaaluminate LiAlO by reaction with alkali2(the reaction equation is Al2O3+2LiOH＝2LiAlO2+H2O). Thereby weakening the adhesion between the active material and the current collector. In addition, polyvinylidene fluoride (PVDF) in the positive electrode material is easy to inactivate in an alkaline environment, and the contact force between the positive electrode material and a current collector is weakened. By combining the above points, the structure of the cathode material is not damaged by using water as a solvent, and the lithium manganate material is easier to strip.
Example 2: as the optimization of the above embodiment, in the first step, the stirring temperature is 40 ℃ to 100 ℃, the stirring speed is 0r/min to 1000r/min, and the stirring time is 2h to 8 h.
Example 3: as an optimization of the above examples, in the first step, the stirring was performed under ultrasonic conditions.
The combination of stirring and ultrasound in the invention provides stronger mechanical action and cavitation action, and can effectively shorten the stripping time.
Example 4: as the optimization of the embodiment, the stirring time under the ultrasonic condition is 10min to 120min, the stirring temperature is 40 ℃ to 100 ℃, and the stirring speed is 0r/min to 1000 r/min.
Example 5: as an optimization of the above embodiment, in the first step, the lithium ion battery positive electrode waste is crushed into round pieces with the diameter of 1cm to 5 cm.
The lithium ion battery anode waste is broken into small wafers, so that in the stirring process, all angles of the small wafers are uniformly stressed, partial aluminum scraps cannot be abraded to enter filtrate after coarse filtration because of touching the inner wall of a beaker in the stirring process, and negative influence on the battery performance caused by doping of the aluminum scraps in a lithium manganate material is further avoided.
Example 6: as an optimization of the above embodiment, in the first step, the lithium ion battery positive electrode waste is crushed into 2cm round pieces.
Example 7: the lithium manganate material is obtained by the method for stripping the lithium manganate material in the lithium ion battery positive electrode waste.
Example 8: the method for recycling the lithium manganese oxide material in the lithium ion battery anode waste material comprises the following steps: firstly, calcining a lithium manganate material to obtain a lithium manganate crystal; secondly, mixing the lithium manganate crystal, acetylene black and polymethyl pyrrolidone according to a required proportion, grinding the mixture in a mortar, and then coating the mixture on a fresh aluminum foil; and thirdly, drying the coated aluminum foil in a drying oven at 120 ℃ for 12-24 h, and cutting the aluminum foil into a positive plate by using a cutting machine to obtain the lithium manganate positive electrode material.
According to the invention, water is selected as a solvent, the positive electrode material (containing lithium manganate, polyvinylidene fluoride and acetylene black) can be effectively stripped in stripping, and the stripped lithium manganate material contains a small amount of polyvinylidene fluoride and acetylene black. According to the invention, the lithium manganate material is treated by adopting a calcination mode, firstly, polyvinylidene fluoride and acetylene black in the lithium manganate material can be burnt, secondly, the crystal form of lithium manganate is effectively improved by calcination, and the electrochemical performance of the stripped lithium manganate material during recycling is improved.
Example 9: as optimization of the above embodiment, in the first step, the calcination temperature is 500 ℃ to 900 ℃, and the calcination time is 8h to 14 h.
Example 10: as optimization of the above embodiment, in the second step, the mass ratio of the lithium manganate crystals, the acetylene black and the polymethyl pyrrolidone is 8:1:1, and the grinding time is 15min to 30 min.
Example 11: stripping experiment of lithium manganese oxide material in lithium ion battery anode waste:
crushing the lithium ion battery positive electrode waste into 2cm round pieces, placing the round pieces in distilled water, wherein the amount of the distilled water corresponding to each 1 g of the lithium ion battery positive electrode waste is 30ml, ensuring that the distilled water is completely soaked in the positive electrode waste, carrying out ultrasonic stirring stripping at the temperature of 60 ℃, carrying out ultrasonic stirring at the stirring speed of 500r/min for 100min, carrying out coarse filtration on the solution after stripping, taking filtrate, and removing aluminum foil; and (3) filtering the filtrate after the coarse filtration by using filter paper, and drying the filter residue after the filtration at 100 ℃ for 4 hours to obtain the lithium manganate material.
The mass of the aluminum foil before and after the separation was measured, and the separation ratio η was calculated from the following formula (1), and the separation ratio in this example was 65%.
In the formula: m is1Quality of positive electrode waste before stripping
m2For stripping the dried aluminum foil
m0Is the quality of pure aluminum foil
m1-m2For the quality of the lithium manganate material actually stripped
m1-m0For the theoretical quality of lithium manganate material
The experiment for investigating the stripping influence factors of the lithium manganese material in the lithium ion battery anode waste material comprises the following steps:
the stirring speed, the stirring temperature, the material-liquid ratio and the stirring time of stripping influence factors of the lithium manganese material in the lithium ion battery anode waste are examined. FIG. 1 shows the influence of different factors on the stripping rate in the stripping process of lithium manganate cathode waste. The graph (a) shows the stripping effect under different stirring speeds, and it can be seen from the graph that the stripping effect is better and better along with the increase of the stirring speed, however, as the stirring speed continues to increase, the structure of the aluminum foil is destroyed, so that the stripped lithium manganate material is impure, and the filtrate part after coarse filtration contains fine aluminum scraps. (b) The effect of the stirring temperature on the peeling rate is shown, and it can be seen that the peeling rate decreases as the temperature increases above 80 ℃. (c) The influence of the feed liquid ratio on the stripping effect is shown in the figure, and it can be seen from the figure that the stripping rate tends to increase first and then decrease as the feed liquid ratio increases. (d) The influence of the stirring time on the peeling effect is shown in the figure, and it can be seen that the peeling rate increases and then decreases as the stirring time increases.
And (3) infrared spectrum test of the stripped lithium manganate material before and after calcination:
and carrying out infrared spectrum test on the lithium manganate material before calcination. And then placing the lithium manganate material in a muffle furnace to be calcined for 1h at 700 ℃, 800 and 900 ℃ respectively, after the lithium manganate material is completely cooled, placing the lithium manganate material in a mortar to be ground for 1h, and characterizing the structural change by adopting an infrared spectrum test, wherein the result is shown in figure 2.
Fig. 2 is a comparison graph of infrared spectra of the stripped lithium manganate material before and after calcination, and compared with the lithium manganate material before calcination, characteristic peaks of the lithium manganate crystal obtained after calcination at wave numbers 1360, 1003 and 761 are weakened, which indicates that polyvinylidene fluoride and acetylene black in the lithium manganate material are completely burned off after calcination, while the characteristic peak at wave number 625 is obviously strengthened, which indicates that the lithium manganate crystal form is improved after calcination.
And (3) carrying out charge-discharge and cycle experiments on the lithium manganate cathode material recycled after stripping:
and assembling the stripped and reused lithium manganate positive electrode material into a button cell, and carrying out charge-discharge and cycle experiment to test the electrochemical performance of the button cell, wherein the result is shown in figure 3.
FIG. 3 is a graph showing a charge-discharge curve and a cycle life of a lithium manganate positive electrode material reused after being peeled off. Wherein (a) is a first cycle charge-discharge diagram of the lithium manganate cathode material and (b) is a cycle life diagram. It can be seen from the graph (a) that the electrochemical performance of the cathode materials prepared at different calcination temperatures is excellent, the first cycle specific charge-discharge capacity shows a tendency of increasing and then decreasing with the increase of the calcination temperature, and when the calcination temperature is too high, lithium in the lithium manganate material may be seriously lost, so that the first cycle charge-discharge capacity decreases, and it can also be seen from the graph (b) that the cycling stability of the sample calcined at 800 ℃ for 12 hours is good.
According to the invention, water is used as a single solvent to effectively strip lithium manganese oxide in the lithium ion battery anode waste and realize direct reutilization. The water is used as a green separation medium, and the structure of the anode material cannot be damaged in the whole stripping process, so that the stability of the material structure in subsequent reuse is maintained. According to the invention, a higher stripping rate can be obtained, the obtained lithium manganate material is calcined to obtain lithium manganate crystals with good crystallinity which can be directly used as the lithium ion battery anode material, no other complex toxic or harmful reagents are needed in the stripping process, no harm is caused to the environment, the final material has high electrochemical capacity and good circulation stability, and the waste of resources and the environmental pollution are effectively reduced.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. A method for stripping a lithium manganese acid material in a lithium ion battery anode waste material is characterized by comprising the following steps: placing the crushed lithium ion battery anode waste into distilled water, stirring and stripping at a required temperature, performing coarse filtration on a mixed solution obtained after stripping, and removing aluminum foil to obtain a coarse filtrate, wherein the amount of distilled water corresponding to each 1 g of lithium ion battery anode waste is 20-60 ml, so as to ensure that the distilled water completely soaks the lithium ion battery anode waste; and secondly, filtering the filtrate after coarse filtration by using filter paper, and drying the filter residue after filtration to obtain the lithium manganate material stripped from the lithium ion battery anode waste.
2. The method for stripping the lithium manganate material in the lithium ion battery cathode waste material according to claim 1, wherein in the first step, the stirring temperature is 40 ℃ to 100 ℃, the stirring speed is 0 to 1000r/min, and the stirring time is 2h to 8 h.
3. The method for stripping the lithium manganate material in the lithium ion battery cathode waste material according to claim 1, wherein in the first step, the stirring is performed under ultrasonic conditions.
4. The method for stripping the lithium manganate material in the lithium ion battery cathode waste material according to claim 3, wherein the stirring time under ultrasonic condition is 10min to 120min, the stirring temperature is 40 ℃ to 100 ℃, and the stirring speed is 0 to 1000 r/min.
5. The method for stripping the lithium manganate material in the lithium ion battery positive electrode waste material according to any one of claims 1 to 4, wherein in the first step, the lithium ion battery positive electrode waste material is crushed into round pieces with the diameter of 1cm to 5 cm.
6. The method for stripping the lithium manganate material in the lithium ion battery positive electrode waste material according to any one of claims 1 to 5, wherein in the first step, the lithium ion battery positive electrode waste material is crushed into 2cm round pieces.
7. A lithium manganate material obtained by the method for stripping lithium manganate material from lithium ion battery positive electrode waste material according to any one of claims 1 to 6.
8. A method of recycling the lithium manganate material according to claim 7, characterized by comprising the steps of:
firstly, calcining a lithium manganate material to obtain a lithium manganate crystal; secondly, mixing the lithium manganate crystal, acetylene black and polymethyl pyrrolidone according to a required proportion, grinding the mixture in a mortar, and then coating the mixture on a fresh aluminum foil; and thirdly, drying the coated aluminum foil in a drying oven at 120 ℃ for 12-24 h, and cutting the aluminum foil into a positive plate by using a cutting machine to obtain the lithium manganate positive electrode material.
9. The method of recycling a lithium manganate material of claim 8, wherein in the first step, the calcination temperature is 500 to 900 ℃ and the calcination time is 8 to 14 hours.
10. The method for recycling lithium manganate in lithium ion battery cathode waste according to claim 8 or 9, wherein in the second step, the mass ratio of lithium manganate crystal, acetylene black and polymethyl pyrrolidone is 8:1:1, and the grinding time is 15min to 30 min.
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