A method for color sorting and separating waste lithium-ion battery electrodes

Abstract

The present invention discloses a method for color sorting and separating waste lithium-ion battery pole pieces. The waste lithium-ion batteries are mechanically disassembled, crushed, magnetically separated, and air-sorted to obtain a large-sized mixture of positive and negative pole pieces. This mixture is then subjected to ultrasonic aqueous exfoliation to increase the pole piece color difference, filtered to separate the negative electrode powder, and then color-sorted to obtain positive pole pieces and copper foil. The positive pole pieces separated by this method are undamaged and high in purity, and can be directly used in recycling processes. The method is simple to operate, highly efficient, and economically beneficial.

Description

Technical Field

[0001] The present invention relates to a method for color sorting and separating waste lithium-ion battery pole pieces, and in particular to a method for aqueous phase stripping and color sorting of a large-scale positive and negative pole piece mixture to achieve effective separation of the pole pieces, belonging to the technical field of waste battery recycling. Background Art

[0002] Lithium-ion batteries are now widely used in our daily lives, but their lifespan is limited. Efficient recycling of retired lithium-ion batteries is crucial for closing the lithium battery cycle. Currently, lithium battery recycling primarily involves wet recycling and direct regeneration. Wet recycling uses reagents such as acids and alkalis to decompose spent battery materials, followed by extraction and purification to produce high-purity metal salts. However, this method results in high losses of key lithium metal resources, high energy consumption, and significant pollution. Direct regeneration, a new, integrated recycling process, primarily transforms spent materials into commercially viable materials through a streamlined process, achieving high-quality utilization with a shorter process and higher resource efficiency. However, direct regeneration places high demands on raw material quality, requiring copper content to be less than 100 ppm and aluminum content to be less than 2000 ppm. Traditional mechanically shredded spent battery materials contain copper content exceeding 3000 ppm, far below the quality requirements for direct regeneration. Therefore, it is crucial to pre-separate the positive and negative electrode sheets at the source, relying on large-scale mechanical disassembly and crushing to prevent the introduction of copper.

[0003] Currently, several technologies have been investigated for color sorting and separation of waste lithium batteries. For example, Chinese patent CN114151802A discloses a method for subjecting waste lithium batteries to high-temperature pyrolysis to depolymerize and carbonize PVDF, followed by etching and stripping the aluminum foil surface with dilute acid, and then separating the resulting copper and aluminum foils through color sorting. However, this method involves pyrolysis to strip the PVDF binder from the positive and negative electrode sheets, resulting in a yellow negative copper foil and white positive aluminum foil. The color difference between the positive and negative electrode sheets is unclear, the degree of mixing is high, the level of impurities is high, and the active material on the positive electrode sheet cannot be retained. Furthermore, the dilute acid etching severely damages the positive and negative electrode sheets.

[0004] Based on this, it is imperative to develop a color sorting and separation process for waste lithium batteries that does not damage the electrodes and increase the color difference between the positive and negative electrodes. Summary of the Invention

[0005] In response to the problems in the prior art of recycled electrodes of waste lithium-ion batteries, such as excessively high impurity content and severe electrode damage, the present invention aims to provide a method for color sorting and separation of electrodes of waste lithium-ion batteries. This method utilizes ultrasonic aqueous phase stripping to selectively strip the water-soluble binder and negative electrode powder from the negative electrode without damaging the electrode, thereby increasing the difference between the negative and positive electrode sheets, and then achieving separation through color sorting.

[0006] In order to achieve the above technical objectives, the present invention provides a method for color sorting and separating waste lithium-ion battery pole pieces. The method comprises the following steps: mechanically disassembling, crushing, magnetically separating and air-selecting the waste lithium-ion batteries to obtain a large-sized positive and negative pole piece mixture; the large-sized positive and negative pole piece mixture is subjected to ultrasonic aqueous phase stripping to increase the pole piece color difference, and the negative electrode powder is filtered and separated, and then color sorting is performed to obtain positive pole pieces and copper foil; the binder used for the negative pole pieces in the large-sized positive and negative pole piece mixture is a water-soluble binder.

[0007] The key to the technical solution of the present invention is to combine the water solubility of the binder in the negative electrode sheet, ultrasonic aqueous phase stripping technology and color separation, selectively remove the binder and negative electrode powder on the negative electrode sheet, increase the color difference between the positive and negative electrode sheets, and achieve a high degree of separation between the positive electrode sheet and the copper foil. Specifically, the current negative electrode sheet mainly uses a water-soluble binder to adhere the negative electrode powder and the copper foil, and the aqueous solution in the aqueous phase stripping can dissolve the water-soluble binder without affecting the positive electrode sheet. Under the action of ultrasound, on the one hand, the dissolution of the binder can be promoted, and on the other hand, the black negative electrode powder can be separated from the yellow copper foil, significantly increasing the color difference between the black positive electrode sheet (aluminum foil + positive active material) and the yellow copper foil. Subsequently, the negative pressure suction cup gripper of the color sorter can be used to achieve precise separation of the positive electrode sheet and the copper foil. More importantly, the aqueous solution in the ultrasonic aqueous phase stripping can provide a certain buffering capacity, avoiding damage to the surface of the positive electrode sheet and the copper foil in the existing recovery and separation technology.

[0008] As a preferred solution, the scale of the large-sized positive and negative electrode mixture is not less than 10 cm 2 . The scale of the positive and negative electrode sheet mixture in the present invention cannot be too small, otherwise broken electrode sheets will be sucked into the suction cup during the subsequent color sorting and separation process, causing damage to the equipment, and also causing the purity of the positive electrode sheets after separation to decrease. The large-scale electrode sheet mechanical process tends to be manual disassembly technology, and the folding between the large positive electrode sheet and the large negative electrode sheet is relatively small. In addition, there are relatively few fine particles, which effectively reduces the entrainment of impurities. Therefore, as the scale increases, the purity of the obtained electrode sheet will also increase. It is further preferred that the scale is 50 to 100 cm 2 .

[0009] As a preferred solution, the waste lithium-ion batteries mainly come from at least one of ternary lithium batteries, lithium iron phosphate batteries, lithium cobalt oxide batteries and lithium titanate batteries purchased on the market.

[0010] As a preferred solution, the conditions for ultrasonic aqueous phase stripping are: water temperature of 30-80°C, ultrasonic power of 500-2000W, and time of 30-60min. If the water temperature is low during the ultrasonic process of the present invention, it is not conducive to the dissolution of the water-soluble binder and the rapid shedding of the negative electrode material; while if the water temperature is high, although graphite and other substances on the surface of the negative electrode copper foil can be quickly stripped, it may cause the stripping of some positive electrode materials on the positive electrode aluminum foil and partial dissolution of the aluminum element, resulting in a decrease in the recovery rate of the positive electrode material and a decrease in the purity of the negative electrode material. If the selected ultrasonic power is too low or the time is too short, the graphite stripping rate on the negative electrode copper foil pole piece will be slow, resulting in a significant decrease in production efficiency; if the ultrasonic power is too high or the time is too long, on the one hand, the positive electrode pole piece will break, the positive electrode powder will fall off, and be introduced into the negative electrode material, resulting in a decrease in the positive electrode recovery rate and a significant decrease in the purity of the negative electrode.

[0011] As a preferred solution, the filtration is performed using a mesh with pores of 1 to 5 cm in diameter. The filtration primarily separates the upper positive electrode sheet and copper foil from the lower negative electrode powder and binder solution. Therefore, the mesh pore size must be larger than the negative electrode powder particle size and smaller than the positive electrode sheet.

[0012] As a preferred solution, the color separation adopts a color sorter for color recognition, drives a negative pressure gripper to sort the materials, and each negative pressure gripper is provided with 2 to 4 suction cup grippers, each of which has an area of ​​0.5 to 1.0 cm 2 If there are too few suction cups on the negative pressure gripper or the suction cup area is too small, it will make it difficult for the gripper to adsorb the positive electrode material or the negative electrode material; if there are too many suction cups on the negative pressure gripper or the suction cup area is too large, the equipment investment will be too large, and other impurities will be introduced into the material suction pipe during the adsorption process.

[0013] As a preferred solution, the number of negative pressure grippers of the color sorter is 2 to 4; the vacuum degree is 0.01 to 0.5 MPa.

[0014] As a preferred solution, after filtering and separating the negative electrode powder, the material is conveyed through a conveyor belt for color sorting and separation. The total length of the conveyor belt is 8 to 10 meters, and a color sorter is set every 0.5 to 0.7 meters. Among them, a color sorter only recognizes one color, black or yellow, at a time, and the colors of two adjacent color sorters are different. The present invention alternately distributes and arranges color sorters of different colors at intervals. The alternating arrangement allows the material to be gradually screened by color sorters with different functions on the conveyor belt. Not only can the black and yellow materials be separated more accurately, thereby improving the overall color sorting and separation efficiency and accuracy, but also the screening process of the material on the conveyor belt is more balanced, thereby improving the stability of the entire color sorting and separation process. If it is not arranged alternately, the recognition error of the color sorter may increase.

[0015] The mechanical disassembly, crushing, magnetic separation, and air separation processes involved in the present invention are conventional operating procedures in the prior art, and their purpose is to obtain a relatively pure mixture of positive and negative pole pieces of waste lithium-ion batteries after removing the iron shell.

[0016] Compared with the prior art, the technical solution of the present invention brings the following beneficial technical effects:

[0017] 1) The method provided by the present invention combines the water-solubility characteristics of the binder in the negative electrode sheet, ultrasonic aqueous phase stripping technology and color separation to selectively remove the binder and negative electrode powder on the negative electrode sheet, increase the color difference between the positive and negative electrode sheets, and achieve a high degree of separation between the positive electrode sheet and the copper foil.

[0018] 2) The positive electrode sheets separated by the method of the present invention are free of damage and have high purity (impurity content is less than 2%), and can be directly used in the regeneration process.

[0019] 3) The color sorting separation of the present invention utilizes a negative pressure gripper to achieve precise separation of waste lithium-ion positive and negative electrode sheets, thereby obtaining pure positive and negative electrode sheets.

[0020] 4) The method of the present invention is simple to operate, highly efficient and has high economic benefits.

[0021] 5) The present invention alternately distributes and spaces the yellow and black color sorters, so that the materials can be gradually screened by the color sorters with different functions on the conveyor belt. This not only can more accurately separate the black and yellow materials, thereby improving the overall color sorting efficiency and accuracy, but also makes the screening process of the materials on the conveyor belt more balanced, thereby improving the stability of the entire color sorting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a process flow chart of the present invention.

[0023] Figure 2 It is the process route diagram of the present invention.

[0024] Figure 3 This is an optical comparison of the large-sized positive and negative electrode mixture before and after aqueous phase stripping in the present invention. Figure 3 It shows that after the aqueous phase stripping method of the present invention, the color difference of the electrode is significantly increased, and the surface of the electrode remains intact and undamaged. DETAILED DESCRIPTION

[0025] The following examples are only specific descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. For those skilled in the art, any improvements made without departing from the present invention should be considered to be within the scope of protection of the present invention.

[0026] The waste lithium-ion batteries used in the present invention are mainly derived from waste lithium iron phosphate batteries purchased on the market. The waste batteries cannot be crushed by shredding, but must be shredded.

[0027] In the embodiment of the present invention, the total length of the conveyor belt is 10 m, each color sorter is provided with three negative pressure grippers, the vacuum degree is 0.1 MPa, the color recognition setting of the first color sorter is yellow, the color recognition setting of the second color sorter is black, and the color recognition setting of the third color sorter is yellow, and they are distributed alternately in this order.

[0028] Example 1 (Comparative Example)

[0029] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 1.0 cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 , sorting and classifying the electrodes to obtain positive electrode sheets and copper foil. However, broken electrodes were sucked into the suction cup, shortening the equipment's service life and reducing efficiency. The impurity content in the separated positive electrode sheets was as high as 29%, making the resulting electrode material difficult to use in direct recycling processes.

[0030] Example 2 (Comparative Example)

[0031] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 , placed on the conveyor belt, every 0.5m, there is a color sorter and equipped with a negative pressure gripper, each negative pressure gripper has 3 suction cup grippers, and the area of ​​each suction cup is 0.8cm 2, sorting and classifying the electrodes. Due to the small color difference, the obtained positive electrodes contain a small amount of copper foil, making it difficult to obtain pure electrodes. The impurity content in the separated positive electrodes is as high as 32%, making the obtained electrode material difficult to use in the direct recycling process.

[0032] Example 3 (Comparative Example)

[0033] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes were placed in a 60°C aqueous solution and stirred at 1000W of ultrasonic power for 30 minutes. The solution was then filtered through a 3cm-diameter mesh. The separated upper layer was dried and placed on a conveyor belt. The electrodes were sorted and classified using a color-selection and air-blowing process. Due to the small density differences and some wrinkles, the positive electrode contained a small amount of copper foil, making it difficult to obtain pure electrodes. The impurity content in the separated positive electrode was as high as 14%, making the obtained electrode material difficult to use in direct recycling processes.

[0034] Example 4

[0035] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 , the electrode pieces are sorted and classified to obtain pure positive electrode pieces and copper foil. The impurity content in the separated positive electrode pieces is 0.5%.

[0036] Example 5

[0037] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain positive and negative electrode sheet mixtures. The scale of the electrode sheet is 50cm 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 , the electrode pieces are sorted and classified to obtain pure positive electrode pieces and copper foil. The impurity content in the separated positive electrode pieces is 0.2%.

[0038] Example 6

[0039] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 100cm 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 , the electrode sheets were sorted and classified to obtain pure positive electrode sheet material and copper foil. The impurity content of the separated positive electrode sheets was 0.02%, suitable for direct regeneration and repair, with high product consistency. A comparison of Examples 4, 5, and 6 shows that as the electrode sheet size increases, the impurity content in the positive electrode sheets decreases.

[0040] Example 7

[0041] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 30°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 The electrodes were sorted and classified to obtain pure positive electrode sheets and copper foil. Due to the lowering of the water temperature, some graphite particles adhered to the electrodes. The impurity content of the separated positive electrode sheets was 0.7%.

[0042] Example 8

[0043] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in an 80°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 , sorting and classifying the electrodes to obtain pure positive electrode sheets and copper foil. As the water temperature rises, some fine copper sheets are introduced, and the impurity content in the separated positive electrode sheets is 0.4%.

[0044] Example 9

[0045] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes at an ultrasonic power of 500W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 , the electrodes are sorted and classified to obtain pure positive electrode sheets and copper foil respectively. The impurity content in the separated positive electrode sheets is 0.2%.

[0046] Example 10

[0047] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 2000W. The mixture is then filtered through a mesh with a 1cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has three suction cups, and each suction cup has an area of ​​0.8cm. 2 , the electrodes were sorted and classified to obtain pure positive electrode sheets and copper foil respectively. The impurity content in the separated positive electrode sheets was 1.2%.

[0048] Example 11

[0049] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a sieve with a hole diameter of 5cm. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has two suction cup grippers, and the area of ​​each suction cup is 0.8cm. 2 , sorting and classifying the electrodes to obtain pure positive electrode sheets and copper foil. The mesh size is increased, and the impurity content in the separated positive electrode sheets is 0.4%.

[0050] Example 12

[0051] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has 4 suction cups, and each suction cup has an area of ​​0.8cm. 2 , sorting and classifying the electrodes to obtain pure positive electrode sheets and copper foil. The impurity content in the separated positive electrode sheets was 0.7%. Increasing the number of suction cup grippers will cause other impurities to be introduced into the material suction pipe during the adsorption process, thereby increasing the impurity content.

[0052] Example 13

[0053] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has 3 suction cups, and the area of ​​each suction cup is 0.5cm. 2 , sorting and classifying the electrodes to obtain pure positive electrode sheets and copper foil. The impurity content in the separated positive electrode sheets is 0.3%. Reducing the suction cup area reduces the impurity content in the positive electrode sheets.

[0054] Example 14

[0055] Through the front-end mechanical disassembly, crushing, magnetic separation, air separation and other processes, large-sized crushed materials are obtained to obtain the positive and negative electrode sheet mixture. The scale of the electrode sheet is 20cm. 2 The positive and negative electrodes are placed in a 60°C aqueous solution and stirred for 30 minutes under an ultrasonic power of 1000W. The mixture is then filtered through a mesh with a 3cm diameter hole. The separated upper layer of material is dried and placed on a conveyor belt. Every 0.5m, a color sorter is distributed and equipped with a negative pressure gripper. Each negative pressure gripper has 3 suction cups, and each suction cup has an area of ​​1.0cm. 2 , sorting and classifying the electrodes to obtain pure positive electrode sheets and copper foil. Some impurities will be sucked into the negative pressure gripper, which is not conducive to the long life of the equipment. The impurity content in the separated positive electrode sheets is 0.8%.

[0056] The separation conditions and separation results of Examples 1 to 14 are shown in Table 1.

[0057] Table 1

[0058]

Claims

1. A method for color sorting and separating waste lithium-ion battery pole pieces, characterized by: After mechanical disassembly, crushing, magnetic separation and air separation of waste lithium-ion batteries, a large-sized positive and negative electrode sheet mixture is obtained; the large-sized positive and negative electrode sheet mixture is subjected to ultrasonic aqueous phase stripping to increase the color difference of the electrode sheets, and the negative electrode powder is separated by filtration, and then separated by color sorting to obtain positive electrode sheets and copper foil; the binder used for the negative electrode sheet in the large-sized positive and negative electrode sheet mixture is a water-soluble binder; The scale of the large-sized positive and negative electrode sheet mixture is not less than 10cm 2 ; The color separation uses a color sorter to identify the color and drive the negative pressure gripper to sort the materials. Each negative pressure gripper is equipped with 2 to 4 suction cup grippers, and the area of ​​each suction cup is 0.5~1.0cm 2 .

2. The method for color sorting and separating waste lithium-ion battery pole pieces according to claim 1, characterized in that: The waste lithium-ion batteries include at least one of ternary lithium batteries, lithium iron phosphate batteries, lithium cobalt oxide batteries and lithium titanate batteries.

3. The method for color sorting and separating waste lithium-ion battery pole pieces according to claim 1 or 2, characterized in that: The conditions for ultrasonic aqueous phase stripping are: water temperature of 30-80° C., ultrasonic power of 500-2000 W, and time of 30-60 min.

4. The method for color sorting and separating waste lithium-ion battery pole pieces according to claim 3, characterized in that: The filtration is performed using a sieve with a hole diameter of 1 to 5 cm.

5. The method for color sorting and separating waste lithium-ion battery pole pieces according to claim 4, characterized in that: The number of negative pressure grippers of the color sorter is 2 to 4; the vacuum degree is 0.01 to 0.5 MPa.

6. The method for color sorting and separating waste lithium-ion battery pole pieces according to claim 5, characterized in that: After filtering and separating the negative electrode powder, the material is conveyed through a conveyor belt for color sorting and separation. The total length of the conveyor belt is 8 to 10 meters, and a color sorter is set every 0.5 to 0.7 meters. Among them, a color sorter only recognizes one color at a time, black or yellow, and the recognition colors of two adjacent color sorters are different.

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