CN114006071A - Method for stripping and recovering anode plate powder of waste lithium battery - Google Patents
Method for stripping and recovering anode plate powder of waste lithium battery Download PDFInfo
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- CN114006071A CN114006071A CN202111279149.4A CN202111279149A CN114006071A CN 114006071 A CN114006071 A CN 114006071A CN 202111279149 A CN202111279149 A CN 202111279149A CN 114006071 A CN114006071 A CN 114006071A
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- 239000000843 powder Substances 0.000 title claims abstract description 49
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002699 waste material Substances 0.000 title claims abstract description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 33
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 32
- 238000000197 pyrolysis Methods 0.000 claims abstract description 31
- 239000011888 foil Substances 0.000 claims abstract description 24
- 239000007774 positive electrode material Substances 0.000 claims abstract description 13
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 8
- 238000010008 shearing Methods 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims abstract description 7
- 239000003792 electrolyte Substances 0.000 claims abstract description 6
- 239000002912 waste gas Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000011149 active material Substances 0.000 claims description 4
- 239000006258 conductive agent Substances 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- NCZYUKGXRHBAHE-UHFFFAOYSA-K [Li+].P(=O)([O-])([O-])[O-].[Fe+2].[Li+] Chemical compound [Li+].P(=O)([O-])([O-])[O-].[Fe+2].[Li+] NCZYUKGXRHBAHE-UHFFFAOYSA-K 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 238000006115 defluorination reaction Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 238000006722 reduction reaction Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 9
- 238000004064 recycling Methods 0.000 abstract description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011737 fluorine Substances 0.000 abstract description 2
- 229910052731 fluorine Inorganic materials 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 abstract 1
- 229920005596 polymer binder Polymers 0.000 abstract 1
- 239000002491 polymer binding agent Substances 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 description 13
- 230000001070 adhesive effect Effects 0.000 description 13
- 239000000047 product Substances 0.000 description 10
- 238000000926 separation method Methods 0.000 description 9
- 239000012535 impurity Substances 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
本发明公开了一种废旧锂电池的正极片极粉剥离回收的方法。本发明将废旧锂电池拆解的正极片在氮气气氛下，在回转式电磁炉中高温热解，使正极材料中的电解液、含氟高分子粘接剂充分分解，大幅度降解正极材料内部以及正极材料与集流体的粘接强度，再将热解后正极片通入破碎剥离一体机，采用剪切方式一次破碎极片，破碎物料直接落入剥离腔室，将正极片极粉从集流体上剥离，剥离后物料通过气动力旋流器分离极粉与铝箔，铝箔通过振动筛进行检查筛分，分离出夹带的极粉。本发明的正极粉回收率在98％以上，极粉品位高，同时回收铝箔，增加了回收过程产值。本发明能处理三元锂电池、3c类电池、磷酸铁锂电池正极片，适合大规模工业化生产。
The invention discloses a method for stripping and recycling the positive electrode sheet of a waste lithium battery. In the present invention, the disassembled positive electrode sheet of the waste lithium battery is pyrolyzed at a high temperature in a rotary induction furnace under a nitrogen atmosphere, so that the electrolyte and the fluorine-containing polymer binder in the positive electrode material are fully decomposed, and the internal and external parts of the positive electrode material are greatly degraded. The bonding strength of the positive electrode material and the current collector, and then the positive electrode sheet after pyrolysis is passed into the crushing and peeling machine, and the polar sheet is crushed at one time by shearing. After peeling, the material is separated from the pole powder and the aluminum foil by a pneumatic cyclone, and the aluminum foil is checked and sieved by a vibrating screen to separate the entrained pole powder. The recovery rate of the positive electrode powder of the present invention is over 98%, the electrode powder has a high grade, and at the same time, the aluminum foil is recovered, and the output value of the recovery process is increased. The invention can process the ternary lithium battery, the 3c type battery and the positive electrode sheet of the lithium iron phosphate battery, and is suitable for large-scale industrial production.
Description
Technical Field
The invention belongs to recycling of waste lithium batteries, and particularly relates to a method for stripping and recycling anode plate powder of a waste lithium battery.
Background
According to statistics, about 324 ten thousand new energy automobiles are sold globally in 2020, the global power battery loading capacity is about 136.3GWH, the Chinese power battery loading capacity is 62.8GWH, and in 2020 enterprises of the global power battery loading TOP10, the Chinese battery enterprises occupy 6 seats. China already has the first new energy automobile and power battery industry chain on a global scale. The loading capacity of power batteries is continuously increased in recent years, the demand of raw materials for upstream use is obviously increased under huge demand and is influenced by resource shortage, China mainly depends on imported ore resources from abroad and high-end products processed by the imported ore resources to meet domestic production supply, and according to statistics, the dependence of the import of raw ores of nickel, cobalt, manganese and lithium respectively exceeds 70%, 80%, 60% and 70%. The recycling of waste lithium battery resources has become an important source of raw material supply for power battery production.
The positive electrode material of the waste lithium battery comprises an active material containing the valuable metal, a fluorine-containing high polymer adhesive, graphite serving as a conductive agent and a current collector aluminum foil, the positive electrode material and the conductive agent graphite are tightly adhered together in a network shape through high dispersion of the high polymer adhesive in a pulping process, and the positive electrode material and the current collector aluminum foil are tightly combined in a high-pressure tabletting process.
The waste lithium ion battery is recycled, so that the production cost is reduced as much as possible, and the environmental pollution is reduced. The effective separation of the anode material and the current collector is low in cost and harmless, and the sustainable development requirements of comprehensive utilization of resources and circular economy under market regulation can be met only by the method. The invention relates to a Chinese invention 201910938060.0, which relates to the recovery of valuable components in waste lithium cobaltate positive plates, the invention is that the positive plates are heated to low temperature in a pyrolysis furnace, the electrolyte of the positive plates is removed at constant temperature for a period of time, then the temperature is raised to 600 ℃ to remove the adhesive, the electrolyte and the adhesive generate waste gas and are recovered by a condensation method, and the materials after pyrolysis are heated and stirred in a water bath at 80 ℃ to realize the dissociation of the positive plate particles and the aluminum foil. The invention needs stage heating and heat preservation, and intermittent operation, and is not suitable for industrial large-scale continuous production; the high-temperature pyrolysis temperature is too high, wet stripping is adopted after pyrolysis, a drying procedure is needed to be added for separating the electrode powder and the aluminum foil, the equipment cost investment is increased, and the electrolyte and the pyrolysis product of the adhesive are not completely treated and are not suitable for the principle of harmless treatment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for stripping and recovering the anode plate powder of the waste lithium battery, which promotes the decomposition of the adhesive in the anode active material through high-temperature pyrolysis, greatly reduces the adhesive strength between the active materials and the current collector, can effectively separate the anode active material and the current collector only through dry stripping, realizes the purposes of low cost and harmless disposal, and meets the sustainable development requirements of comprehensive utilization of resources and circular economy.
The invention is realized by adopting the following technical scheme:
a method for stripping and recovering anode plate powder of a waste lithium battery comprises the following steps:
(1) carrying out high-temperature pyrolysis on the anode plate disassembled from the waste lithium battery in a nitrogen atmosphere by using a rotary induction cooker heated to the pyrolysis temperature of 500-600 ℃; the waste gas generated in the pyrolysis process is sent to a secondary combustion chamber and a defluorination device for purification and then is discharged after reaching the standard;
(2) the pyrolyzed positive plate is crushed at one time in a shearing mode through a crushing and stripping integrated machine to obtain large pieces of regular materials (the size is 30-40 mm); directly feeding the crushed large-piece material into a stripping machine chamber for stripping, and separating the anode plate electrode powder from the current collector;
(3) separating the anode plate powder and the current collector mixture after stripping by using an aerodynamic cyclone, separating the anode plate powder from the top of the cyclone as a fine-grained material, separating a current collector from the bottom of the cyclone, checking and screening the current collector obtained from the bottom of the cyclone by using a vibrating screen, wherein the product on the screen is a current collector aluminum foil (the granularity is 1-10mm), and the product under the screen is the anode plate powder below 80 meshes (0.18 mm).
Furthermore, the current collector is filled with nitrogen for protection in the screening process through a vibrating screen, so that the risk of aluminum explosion is avoided.
Further, the material aluminum foil product on the vibrating screen is checked and screened and is pressed into an aluminum block in a hydraulic or air pressure pressing mode, so that the material is convenient to transport, and the aluminum foil moisture absorption aluminum oxide explosion risk is avoided.
Further, the anode plate disassembled from the waste lithium battery is the anode plate of the waste lithium battery or a scrapped anode plate in the lithium battery production process; the waste lithium battery is a ternary lithium battery, a 3C battery or a lithium iron phosphate lithium battery.
Further, in step (1), the rotary induction cooker is in a back-and-forth turnover form, so that the materials are continuously turned over along the furnace wall, the materials are uniformly baked at high temperature and fully decomposed, waste gas generated by pyrolysis is sent to a secondary combustion chamber for disposal, and the waste gas is discharged after reaching the standard.
Further, in the step (1), the pyrolysis temperature is preferably 550-580 ℃; at said temperature, the adhesive is sufficiently decomposed. According to the multi-part test, the adhesive can be completely decomposed within 1 hour at the temperature, and the latticed fine holes are left in the positive electrode material, so that the adhesive strength of the material and the current collector is greatly reduced.
With a pyrolysis temperature of 550 ℃ and 580 ℃, there are two equilibrium considerations: the pyrolysis temperature ensures that the adhesive inside the material is completely decomposed, the bonding strength between the material and the current collector is greatly reduced, and conditions are created for the subsequent separation of the electrode powder and the current collector. If the pyrolysis temperature is reduced, the adhesive is not completely decomposed, the separation efficiency of subsequent procedures is reduced, or the pyrolysis time is prolonged, the energy consumption is increased, and the cost is increased; if the pyrolysis temperature is further increased, the power of the electromagnetic oven equipment can be increased, the energy consumption is increased, the aluminum foil part of the current collector is possibly melted and bonded with materials, the subsequent separation of the electrode powder and the current collector is not facilitated, and the aluminum impurity content in the electrode powder is higher.
Furthermore, if the positive plate is a positive plate injected with liquid by a waste lithium battery, the electrolyte in the positive material is combusted and fully decomposed to generate carbon dioxide under the nitrogen atmosphere, the carbon and the conductive agent graphite generated by decomposition of the binder can be jointly used as a reducing agent, and the structural part of the positive active material is collapsed through a reduction reaction, so that the bonding strength between the active materials and between the positive material and a current collector is further reduced, and the separation efficiency of a subsequent stripping process is further improved.
Further, crushing and stripping of the positive plate after pyrolysis are carried out in a crushing and stripping all-in-one machine. The material after pyrolysis is crushed in a shearing mode at one time, metal fine powder is few, and the crushed material is in a regular shape with a size of 30-40 mm.
Further, in the step (2), the stripping adopts dry stripping; after the positive plate is crushed, the positive plate directly enters a stripping chamber, and dry stripping is adopted, so that the drying procedure after wet stripping is reduced, and the investment of heating and baking equipment and the like is avoided.
Compared with the prior art, the invention has the beneficial effects that:
(1) the material is turned over and uniformly heated at the pyrolysis temperature through the rotary induction cooker, the adhesive in the positive electrode material is fully decomposed at the pyrolysis temperature, the bonding strength between the positive electrode material and the current collector is degraded, the subsequent dry stripping efficiency is improved, and the recovery process is simple and reliable.
(2) According to the high-temperature pyrolysis method, the whole process is in a nitrogen atmosphere protection state, all waste gas generated by pyrolysis is treated by the secondary combustion chamber, and the waste gas is purified and discharged up to the standard, so that the environmental protection property of the process is improved.
(3) The crushing and stripping integrated machine is shear type one-step crushing and airflow stripping, the crushed materials are in a large sheet shape, the size is about 30-40 mm, the granularity of the stripped aluminum foil is 1-10mm, fine-grained aluminum powder generated in the crushing and stripping process is extremely small, the grade of the anode powder is not reduced, and meanwhile, the value of the anode powder is improved due to the extremely low content of metal impurities.
(4) The recovery rates of the anode powder and the aluminum foil are over 98 percent, the grade of the anode powder reaches over 99.5 percent (the aluminum content is below 0.5 percent), the aluminum foil is recovered at the same time, and the yield is improved by over 25 percent, so that the method is suitable for the anode plate of the waste lithium battery and the scrapped anode plate in the production process of the lithium battery; the lithium battery can be a ternary lithium battery, a 3c battery, a lithium iron phosphate lithium battery and the like, and the invention is suitable for large-scale industrial production.
Drawings
FIG. 1 is a block diagram of a process flow for an embodiment of the present invention.
Detailed Description
The following examples are intended to further illustrate the present disclosure, but not to limit the scope of the claims.
The process flow diagram of the embodiment of the invention is shown in fig. 1.
Example 1
Under the nitrogen atmosphere, the temperature of a rotary induction cooker is raised to 550 ℃ in advance, then positive plates of waste lithium batteries are introduced, high-temperature pyrolysis is carried out for 1 hour, waste gas generated by the high-temperature pyrolysis is sent into a secondary combustion chamber for disposal, and the waste gas is discharged after reaching the standard. And feeding the pyrolyzed material into a crushing and stripping all-in-one machine, crushing the pyrolyzed material at one time in a shearing mode, enabling the crushed material to be in a large sheet regular shape of 30-40 mm, directly feeding the crushed material into a stripping machine from an outlet of a shearing machine, enabling the crushed material to rotate at a high speed in a stripping cavity under high-speed airflow, enabling the crushed material to collide and rub with gear-shaped protrusions arranged on the annular wall of the cavity, and separating polar powder on the surface of a pole piece from a current collector. And an outlet of the crushing and stripping all-in-one machine is connected with a pneumatic cyclone for separation to obtain fine-grained anode powder and coarse-grained aluminum foil, the aluminum foil is screened by a vibrating screen, oversize products are current collector aluminum foils, undersize products are anode powder, and the anode powder obtained by air flow separation is combined with the anode powder to form an anode powder product.
The recovery rate of the anode powder is 98.7%, and the content of impurity aluminum is 0.10%.
The recovery of the aluminum foil was 98.7%.
Example 2
Under the nitrogen atmosphere, the temperature of a rotary induction cooker is raised to 550 ℃ in advance, then a scrapped positive plate in the lithium battery production process is introduced, high-temperature pyrolysis is carried out for 1 hour, waste gas generated by the high-temperature pyrolysis is sent into a secondary combustion chamber to be treated, and the waste gas is discharged after reaching the standard. And feeding the pyrolyzed material into a crushing and stripping all-in-one machine, crushing at one time in a shearing mode, wherein the crushed material is in a large regular shape of 30-40 mm, directly enters the stripping machine from an outlet of a shearing machine, rotates at a high speed in a stripping cavity under high-speed airflow, and collides and rubs with a gear-shaped protrusion arranged on the annular wall of the cavity, so that polar powder on the surface of a pole piece is separated from a current collector. And an outlet of the crushing and stripping all-in-one machine is connected with a pneumatic cyclone for separation to obtain fine-grained anode powder and coarse-grained aluminum foil, the aluminum foil is screened by a vibrating screen, oversize products are current collector aluminum foils, undersize products are anode powder, and the anode powder obtained by air flow separation is combined with the anode powder to form an anode powder product.
The recovery rate of the anode powder is 98.3%, and the content of impurity aluminum is 0.15%.
The recovery rate of the aluminum foil was 98.5%.
Claims (9)
1. A method for stripping and recovering anode plate powder of a waste lithium battery is characterized by comprising the following steps:
(1) carrying out high-temperature pyrolysis on the anode plate disassembled from the waste lithium battery in a nitrogen atmosphere by using a rotary induction cooker heated to the pyrolysis temperature of 500-600 ℃; the waste gas generated in the pyrolysis process is sent to a secondary combustion chamber and a defluorination device for purification and then is discharged after reaching the standard;
(2) the pyrolyzed positive plate is crushed at one time in a shearing mode through a crushing and stripping integrated machine to obtain large pieces of regularly crushed materials; directly feeding the crushed large-piece material into a stripping machine chamber for stripping, and separating the anode plate electrode powder from the current collector;
(3) separating the anode plate electrode powder and the current collector mixture after stripping by using an aerodynamic cyclone, separating the anode plate electrode powder from the top of the cyclone as a fine-grained material, separating a current collector from the bottom of the cyclone, checking and screening the current collector obtained from the bottom of the cyclone by using a vibrating screen, wherein the product on the screen is a current collector aluminum foil, and the product under the screen is the anode plate electrode powder below 80 meshes.
2. The method for stripping and recovering the positive plate electrode powder of the waste lithium battery as claimed in claim 1, wherein the size of the crushed material is 30-40 mm.
3. The method for stripping and recovering the positive plate electrode powder of the waste lithium battery as claimed in claim 1, wherein in the step (2), the stripping adopts dry stripping.
4. The method for stripping and recovering the anode plate powder of the waste lithium battery as claimed in claim 1, wherein the anode plate disassembled from the waste lithium battery is the anode plate of the waste lithium battery or a scrapped anode plate in the lithium battery production process; the waste lithium battery is a ternary lithium battery, a 3C battery or a lithium iron phosphate lithium battery.
5. The method for stripping and recovering the anode powder of the positive plates of the waste lithium batteries according to any one of claims 1 to 4, wherein the current collector is filled with nitrogen for protection in a vibrating screen inspection and screening process, so that the risk of aluminum explosion is avoided.
6. The method for stripping and recovering the anode plate powder of the waste lithium battery as claimed in any one of claims 1 to 4, wherein the aluminum foil product which is a material on the screen is checked by a vibrating screen and is pressed into an aluminum block by a hydraulic or pneumatic method.
7. The method for stripping and recovering the anode plate powder of the waste lithium battery as claimed in any one of claims 1 to 4, wherein in the step (1), the rotary electromagnetic oven is in a back-and-forth overturning mode, so that the material is continuously overturned along the oven wall, and is uniformly baked at high temperature and fully decomposed.
8. The method for stripping and recovering the positive electrode plate powder of the waste lithium battery as claimed in any one of claims 1 to 4, wherein the pyrolysis temperature in the step (1) is 550 ℃ and 580 ℃.
9. The method for stripping and recovering the positive electrode plate powder of the waste lithium battery as claimed in any one of claims 1 to 4, wherein when the positive electrode plate is a liquid-injected positive electrode plate of the waste lithium battery, the electrolyte in the positive electrode material is combusted in a nitrogen atmosphere, carbon dioxide generated by sufficient decomposition is generated, and carbon and conductive agent graphite generated by decomposition of the binder can be used as a reducing agent together, and the reduction reaction is performed to partially collapse the structure of the positive electrode active material, thereby further reducing the bonding strength between the active materials and between the positive electrode material and the current collector.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453383A (en) * | 2022-04-13 | 2022-05-10 | 东莞市鹏锦机械科技有限公司 | Method, system and medium for recovering anode material of waste lithium battery |
| CN114614129A (en) * | 2022-02-23 | 2022-06-10 | 上海电气集团股份有限公司 | Method for recovering ternary electrode powder |
| CN115945505A (en) * | 2022-12-28 | 2023-04-11 | 武汉动力电池再生技术有限公司 | Method for stripping electrode material and current collector of waste lithium ion battery |
| CN116658902A (en) * | 2023-05-30 | 2023-08-29 | 湖南金凯循环科技有限公司 | A waste lithium battery pole piece recovery device |
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| CN116658902A (en) * | 2023-05-30 | 2023-08-29 | 湖南金凯循环科技有限公司 | A waste lithium battery pole piece recovery device |
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