An electrode sheet recycling device and method

Abstract

The application belongs to the technical field of battery recycling, and discloses a kind of pole piece recycling processing device and method.The pole piece recycling processing device includes current collector recovery assembly, negative pressure adsorption component, heating assembly, separation component, solvent spraying component and material collection component.The application device structure is simple, easy to operate, and is suitable for complete recovery of waste lithium ion battery positive and negative pole piece, complete separation of positive and negative current collector and positive and negative active material, low energy consumption required for processing, simple processing process without crushing, shorter process.Lossless separation of current collector and active material is realized by using separation component and solvent, copper foil, aluminum foil, positive and negative active material in waste lithium ion battery pole piece are recycled, and the complex separation step in subsequent processing is reduced.The black powder obtained by processing can be used for repair and regeneration and metal element recovery, without considering further copper and aluminum removal.

Description

Technical Field

[0001] This invention belongs to the field of battery recycling technology, and relates to an electrode recycling and processing device and method, specifically to a waste lithium-ion battery electrode recycling and processing device and method. Background Technology

[0002] Existing electrode processing technologies for recycling waste lithium-ion batteries are divided into dry and wet methods, each with its own advantages and disadvantages.

[0003] Patent document CN111063958B discloses a waste lithium-ion battery recycling and processing device, which separates organic components by pyrolysis, air-separates the positive and negative electrode powder materials, magnetically separates the outer shell, and finally obtains aluminum positive electrode plate and copper negative electrode plate.

[0004] Patent document CN115347266B discloses a wet crushing and recycling method and apparatus for waste lithium-ion batteries. The method involves crushing waste lithium-ion batteries in a solution, followed by hydrodynamic separation, filtration, wet ball milling and screen separation, and then vacuum distillation and volatilization to obtain black powder. However, the above methods suffer from problems such as dust and electrolyte volatilization, as well as lengthy recovery processes, complex equipment, and heavy wastewater treatment burdens. Furthermore, the crushing process indiscriminately mixes the positive and negative current collectors, diaphragm, and shell, requiring further complex separation to obtain the individual components, making subsequent processing steps even more cumbersome. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a waste lithium-ion battery electrode recycling and processing device and method, which can effectively separate and recycle current collectors and positive and negative electrode active materials.

[0006] To achieve the objectives of this invention, the specific technical solution is as follows: An electrode recycling and processing device includes a current collector recycling component, a negative pressure adsorption component, a heating component, a separation component, a solvent spraying component, and a material collection component; The current collector recovery assembly includes two frames arranged opposite to each other, a raw material electrode roll and a current collector roll respectively rotatably arranged on the two frames, the current collector roll is formed by winding the current collector, the raw material electrode roll is formed by winding the raw material electrode roll and the current collector roll are connected by winding the raw material electrode and the current collector, and the raw material electrode is separated into a current collector after the positive and negative electrode active materials are separated by the separation assembly. The negative pressure adsorption assembly includes a negative pressure unit, a tabletop negative pressure pipe, and a negative pressure adsorption workbench. The negative pressure adsorption workbench has a cavity inside, and the cavity is provided with an air extraction hole that communicates with the tabletop negative pressure pipe. The top of the negative pressure adsorption workbench is provided with multiple adsorption holes that communicate with the cavity. The negative pressure unit is connected to the tabletop negative pressure pipe, and the raw material electrode is located above the adsorption holes. The heating assembly includes a heating unit and heat-conducting strips installed on the negative pressure adsorption workbench; The solvent spraying assembly is used to spray solvent onto the raw material electrode sheet, the separation assembly is used to separate the positive and negative electrode active materials on the raw material electrode sheet from the sprayed solvent, and the material collection assembly is used to collect the positive and negative electrode active materials separated by the separation assembly.

[0007] Furthermore, support rods are provided at both ends of the frame, and the support rods on the same frame are connected by crossbars. The current collector roll and the raw material electrode roll are provided with through holes in the center for the crossbars to pass through.

[0008] Furthermore, the heat-conducting strip is embedded in the negative pressure adsorption worktable; it is used to heat the negative pressure adsorption worktable; more preferably, the heat-conducting strip has no contact with the raw material electrode and is disposed on both sides of the adsorption hole.

[0009] Furthermore, the separation assembly includes a separation head, a material recovery negative pressure pipeline, a lead screw, a movable frame, a recovery hopper fixed frame, a material recovery pipeline, and a recovery hopper. The separation head includes a roller brush, a baffle plate, a small-capacity solvent storage tank, and a roller brush drive unit. The roller brush has two parallel roller brushes. The baffle plate includes an upper baffle plate and a lower baffle plate disposed between the two roller brushes. The upper baffle plate, the lower baffle plate, and the roller brushes form a negative pressure channel communicating with the material recovery negative pressure pipeline. The negative pressure channel is connected to the recovery hopper through the material recovery pipeline. The material recovery negative pressure pipeline is connected to the negative pressure unit. The two roller brushes are symmetrically arranged at the bottom of the separation head. The small-capacity solvent storage tank is disposed above the roller brushes, and the small-capacity solvent storage tank has an outlet located above the roller brushes. The separation head is mounted on a movable frame, which is horizontally mounted on the frame via a lead screw. The movable frame can move back and forth via the lead screw, and the recycling bin is fixed to the frame via a recycling bin fixing frame.

[0010] More preferably, there is a gap between the two ends of the lower baffle plate and the roller brush, and the two ends of the upper baffle plate are fitted together with the roller brush.

[0011] More preferably, the separating head is connected to the moving frame via a cylinder unit, which can drive the separating head to move up and down in the vertical direction.

[0012] More preferably, the solvent spraying assembly includes a solvent storage tank, a solvent delivery pump, a solvent feeding pipe, a solvent platform storage compartment, a solvent platform pipe, a solvent spraying pump, a solvent pump outlet pipe, a solvent spraying head, and a lead screw; The solvent platform storage compartment is positioned above the negative pressure adsorption workbench; the solvent spray head is mounted on the mobile frame; the solvent platform storage compartment is connected to the solvent spray head via a solvent platform pipe, a solvent spray pump, and a solvent pump outlet pipe; and the solvent storage tank is connected to the solvent platform storage compartment via a solvent delivery pump and a solvent feeding pipe.

[0013] More preferably, the material collection assembly includes a negative pressure extraction pipe, a negative pressure pump, a material pump outlet pipe, and a material recovery box, wherein the material recovery box is connected to the recovery bin via the negative pressure extraction pipe, the negative pressure pump, and the material pump outlet pipe.

[0014] This invention also discloses an electrode recycling method, using the aforementioned electrode recycling apparatus, comprising the following steps: (1) Install the current collector coil and the raw material electrode coil on the current collector recovery assembly; (2) Turn on the negative pressure adsorption assembly and adsorb the raw material electrode above the adsorption hole onto the negative pressure adsorption worktable; (3) Turn on the heating component and heat the negative pressure adsorption workbench through the heat conduction strip to heat the raw material electrode sheet; (4) Turn on the solvent spraying assembly. The sprayed solvent will fully wet the raw material electrode adsorbed on the negative pressure adsorption worktable. (5) Open the separation assembly to separate the positive and negative electrode active materials on the raw material electrode sheet that has been sprayed with solvent; (6) Repeat steps (4) to (5) to perform the spraying solvent, electrode wetting and separation operations until there are no residual active substances on the raw material electrode; (7) Rotate the current collector roll and the raw material electrode roll to wind the raw material electrode with the separated active material onto the current collector roll. Repeat steps (2) to (7) for continuous operation.

[0015] Furthermore, in step (3), the negative pressure adsorption workbench is heated to 100~200℃ by a heat-conducting strip.

[0016] Further, in step (4), the solvent is a eutectic solvent composed of a hydrogen bond acceptor and a hydrogen bond donor; the hydrogen bond acceptor is choline chloride, and the hydrogen bond donor is at least one of malic acid, ethylene glycol, and acetamide.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The device of this invention has a simple structure and is easy to operate. It can completely recycle the positive and negative electrode sheets of waste lithium-ion batteries, completely separate the positive and negative electrode current collectors and positive and negative electrode active materials, and requires low energy consumption. The processing is simple and does not require crushing, resulting in a shorter process. By using separation components and solvents, the current collector and active materials are separated without damage, and copper foil, aluminum foil, and positive and negative electrode active materials in waste lithium-ion battery electrode sheets are recovered, reducing the complex separation steps in subsequent processing. The black powder obtained from the process can be used for repair and regeneration and metal element recovery without the need for further copper and aluminum removal.

[0018] (2) The solvent sprayed in this invention is a green and biodegradable eutectic solvent, which is low in cost and has a good separation effect.

[0019] (3) The method and apparatus proposed in this invention can reduce the difficulty and cost of recycling and processing waste lithium-ion battery electrodes, and are also very beneficial to the recycling and processing of black powder in the downstream. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the electrode recycling and processing device of the present invention; Figure 2 This is a schematic diagram of the negative pressure adsorption workbench of the present invention; Figure 3 This is a schematic diagram of the structure of the separation component of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the separation component of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the structure of the separation component of the present invention. Figure 3 ; Figure 6 This is a schematic diagram of the solvent spraying assembly of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the solvent spraying assembly of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the material collection component of the present invention; in: 1—Raw material electrode roll; 2—Negative pressure adsorption assembly; 21—Heating unit; 22—Heat conduction strip; 23—Negative pressure adsorption workbench; 24—Negative pressure unit; 25—Negative pressure pipe on the workbench; 3—Separation component; 31—Material recovery negative pressure pipeline; 31a—Rubber vacuum tube; 31b—Stainless steel vacuum tube; 32—Mobile frame; 33—Recovery bin fixed frame; 34—Material recovery pipeline; 35—Recovery bin; 36—Roller brush; 37—Lower baffle; 38—Upper baffle; 39—Liquid outlet; 310—Small capacity solvent storage compartment; 311—Cylinder unit; 312—Roller brush drive unit; 4—Current collector recovery assembly; 41—Frame; 42—Current collector reel; 5—Solvent spray assembly; 51—Solvent feeding pipe; 52—Solvent transfer pump; 53—Solvent storage tank; 54—Solvent platform storage compartment; 55—Solvent platform pipe; 56—Solvent spray pump; 57—Solvent pump outlet pipe; 58—Solvent spray head; 59—Screw; 6—Material collection assembly; 61—Negative pressure extraction pipe; 61a—Negative pressure extraction pipe one; 61b—Negative pressure extraction pipe two; 62—Negative pressure pump; 63—Material pump outlet pipe; 64—Material recovery box. Detailed Implementation

[0022] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0023] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0024] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0025] Example 1 See Figures 1-8 This embodiment discloses an electrode recycling and processing device, which includes a current collector recycling component 4, a negative pressure adsorption component 2, a heating component, a separation component 3, a solvent spraying component 5, and a material collection component 6. The solvent spraying component 5 is used to spray solvent onto the raw material electrode, the separation component 3 is used to separate the positive and negative electrode active materials on the raw material electrode that has been sprayed with solvent, and the material collection component 6 is used to collect the positive and negative electrode active materials separated by the separation component 3.

[0026] In this embodiment, the current collector recovery assembly 4 includes two opposing frames 41, a raw material electrode roll 1 and a current collector roll 42 respectively rotatably mounted on the two frames 41. The current collector roll 42 is formed by winding the current collector sheet, and the raw material electrode roll 1 is formed by winding the raw material electrode roll 1. The raw material electrode roll 1 and the current collector roll 42 are connected by the winding of the raw material electrode sheet and the current collector sheet. After the positive and negative electrode active materials are separated by the separation assembly 3, the current collector sheet is obtained. Support rods are provided at both ends of the frames 41, and the support rods on the same frame 41 are connected by crossbars. The current collector roll 42 and the raw material electrode roll 1 are provided with through holes for the crossbars to pass through.

[0027] In this embodiment, the negative pressure adsorption assembly 2 includes a negative pressure unit 24, a tabletop negative pressure pipe 25, and a negative pressure adsorption workbench 23. The negative pressure adsorption workbench 23 has a cavity inside, and the cavity is provided with an air extraction hole that communicates with the tabletop negative pressure pipe 25. The top of the negative pressure adsorption workbench 23 is provided with multiple adsorption holes that communicate with the cavity. The negative pressure unit 24 is connected to the tabletop negative pressure pipe 25, and the raw material electrode is located above the adsorption holes.

[0028] In this embodiment, the heating assembly includes a heating unit 21 and a heat-conducting strip 22 disposed on the negative pressure adsorption worktable 23. The specific heat transfer method is conduction heat transfer. An electric heating tube is disposed inside the heat-conducting strip, and the electric heating tube wire is connected to the heating unit, which controls the temperature. As one of the preferred embodiments of this embodiment, the heat-conducting strip 22 is embedded in the negative pressure adsorption worktable 23 for heating the negative pressure adsorption worktable 23. Further preferably, the heat-conducting strip 22 has no contact with the raw material electrode and is disposed on both sides of the adsorption hole.

[0029] In this embodiment, the separation assembly 3 includes a separation head, a material recovery negative pressure pipeline 31, a lead screw 59, a movable frame 32, a recovery hopper fixed frame 33, a material recovery pipeline 34, and a recovery hopper 35. The separation head includes a roller brush 36, a baffle plate, a small-capacity solvent storage compartment 310, a cylinder unit 311, and a roller brush drive unit 312. The roller brush 36 consists of two parallel roller brushes. The baffle plate includes an upper baffle plate 38 and a lower baffle plate 37 disposed between the two roller brushes 36. The upper baffle plate 38, the lower baffle plate 37, and the roller brushes 36 form a material recovery channel communicating with the material recovery pipeline 34. The material recovery negative pressure pipeline 31... The material recovery bin 35 is connected to the material recovery pipe 34, and the material recovery negative pressure pipe 31 is connected to the negative pressure unit 24. Two roller brushes 36 are symmetrically arranged at the bottom of the separation head, and the roller brush drive unit 312 drives the roller brushes 36 to rotate relative to each other. The small capacity solvent storage cell 310 is arranged above the roller brushes 36, and the small capacity solvent storage cell 310 is provided with a liquid outlet 39 located above the roller brushes. The separation head is arranged on the movable frame 32, and the movable frame 32 is horizontally arranged on the frame 41 by the lead screw 59. The movable frame 32 can be moved back and forth by the lead screw 59. The material recovery bin 35 is fixed between the frames 41 by the material recovery bin fixing frame 33.

[0030] As one of the preferred embodiments of this invention, the material recovery negative pressure pipeline 31 is composed of a rubber vacuum tube 31a and a stainless steel vacuum tube 31b; the stainless steel vacuum tube 31b is connected to the negative pressure unit 24; one end of the rubber vacuum tube is connected to the stainless steel vacuum tube 31b, and the other end is connected to the recovery material box 35.

[0031] As one of the preferred embodiments of this invention, a gap is left between the two ends of the lower baffle plate 37 and the roller brush 36, and the two ends of the upper baffle plate 38 are fitted together with the roller brush 36. As one of the preferred embodiments of this invention, the separating head is connected to the movable frame 32 through a cylinder unit 311, and the cylinder unit 311 can drive the separating head to move up and down in the vertical direction.

[0032] In this embodiment, the solvent spraying assembly 5 includes a solvent storage tank 53, a solvent delivery pump 52, a solvent feeding pipe 51, a solvent platform storage cell 54, a solvent platform pipe 55, a solvent spraying pump 56, a solvent pump outlet pipe 57, a solvent spray head 58, and a lead screw 59. The solvent platform storage cell 54 is disposed above the negative pressure adsorption workbench 23. The solvent spray head 58 is disposed on the movable frame 32. The solvent platform storage cell 54 is connected to the solvent spray head 58 through the solvent platform pipe 55, the solvent spraying pump 56, and the solvent pump outlet pipe 57. The solvent storage tank 53 is connected to the solvent platform storage cell 54 through the solvent delivery pump 52 and the solvent feeding pipe 51.

[0033] In this embodiment, the material collection assembly 6 includes a negative pressure extraction pipe 61, a negative pressure pump 62, a material pumping outlet pipe 63, and a material recovery box 64. The material recovery box 64 is connected to the recovery bin 35 via the material pumping outlet pipe 63, the negative pressure pump 62, and the negative pressure extraction pipe 61. As one of the preferred embodiments of this embodiment, the negative pressure extraction pipe 61 includes a first negative pressure extraction pipe 61a and a second negative pressure extraction pipe 61b. The material pumping outlet pipe 63 is connected to the recovery bin 35 via a split-type docking connection. During the separation operation, the recovery bin 35 is separated from the material recovery bin 64, and the first negative pressure extraction pipe 61a is disconnected from the second negative pressure extraction pipe 61b, while the first negative pressure extraction pipe 61a remains sealed. After multiple separation operations are completed, the recovery bin 35 moves to the end where the material recovery bin 64 is located. At this time, the first negative pressure extraction pipe 61a and the second negative pressure extraction pipe 61b are docked and securely connected.

[0034] An electrode recycling method, using the aforementioned electrode recycling apparatus, includes the following steps: (1) Install the current collector coil and the raw material electrode coil on the current collector recovery assembly; (2) Turn on the negative pressure adsorption assembly and adsorb the raw material electrode above the adsorption hole onto the negative pressure adsorption worktable; (3) Turn on the heating component and heat the negative pressure adsorption workbench through the heat conduction strip to heat the raw material electrode sheet; (4) Turn on the solvent spraying assembly. The sprayed solvent will fully wet the raw material electrode adsorbed on the negative pressure adsorption worktable. (5) Open the separation component. The separation component is equipped with a roller brush. The upper part of the roller brush is equipped with a small-capacity solvent storage cell. The solvent is mixed into the roller brush during the recovery process. A baffle plate is provided on the side of the roller brush. The baffle plate is used to scrape off the recovered material on the roller brush. The scraped recovered material is pumped into the recovery material box through the recovery pipe under negative pressure. The recovered material can be taken out of the recovery material box after one operation. (6) Repeat steps (4) to 5 to perform the spraying solvent, electrode wetting and separation operations until there are no residual active substances on the raw material electrode; (7) Rotate the current collector roll and the raw material electrode roll to wind the raw material electrode with the separated active material onto the current collector roll. Repeat steps (2) to (7) for continuous operation.

[0035] In step (3) of this embodiment, the negative pressure adsorption workbench is heated to 100~200℃ by a heat-conducting strip.

[0036] In step (4) of this embodiment, the solvent is a eutectic solvent composed of choline chloride as a hydrogen bond acceptor and malic acid, ethylene glycol and acetamide as hydrogen bond donors.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electrode recycling and processing device, characterized in that, The electrode recycling and processing device includes a current collector recycling component, a negative pressure adsorption component, a heating component, a separation component, a solvent spraying component, and a material collection component; The current collector recovery assembly includes two frames arranged opposite to each other, a raw material electrode roll and a current collector roll respectively rotatably arranged on the two frames, the current collector roll is formed by winding the current collector, the raw material electrode roll is formed by winding the raw material electrode roll and the current collector roll are connected by winding the raw material electrode and the current collector, and the raw material electrode is separated into a current collector after the positive and negative electrode active materials are separated by the separation assembly. The negative pressure adsorption assembly includes a negative pressure unit, a tabletop negative pressure pipe, and a negative pressure adsorption workbench. The negative pressure adsorption workbench has a cavity inside, and the cavity is provided with an air extraction hole that communicates with the tabletop negative pressure pipe. The top of the negative pressure adsorption workbench is provided with multiple adsorption holes that communicate with the cavity. The negative pressure unit is connected to the tabletop negative pressure pipe, and the raw material electrode is located above the adsorption holes. The heating assembly includes a heating unit and heat-conducting strips installed on the negative pressure adsorption workbench; The solvent spraying assembly is used to spray solvent onto the raw material electrode sheet, the separation assembly is used to separate the positive and negative electrode active materials on the raw material electrode sheet from the sprayed solvent, and the material collection assembly is used to collect the positive and negative electrode active materials separated by the separation assembly. in: Support rods are provided at both ends of the frame, and the support rods on the same frame are connected by crossbars. The current collector roll and the raw material electrode roll are provided with through holes in the center for the crossbars to pass through. The separation assembly includes a separation head, a material recovery negative pressure pipeline, a lead screw, a movable frame, a fixed frame for the recovery hopper, the material recovery pipeline, and the recovery hopper. The separation head includes a roller brush, a baffle plate, a small-capacity solvent storage tank, and a roller brush drive unit. Two parallel roller brushes are arranged. The baffle plate includes an upper baffle plate and a lower baffle plate positioned between the two roller brushes. The upper and lower baffle plates and the roller brushes form a negative pressure channel communicating with the material recovery negative pressure pipeline. The negative pressure channel is connected to the recovery hopper via the material recovery pipeline, which is also connected to a negative pressure unit. The two roller brushes are symmetrically arranged at the bottom of the separation head. The small-capacity solvent storage tank is positioned above the roller brushes, and its outlet is located above the roller brushes. The separation head is mounted on a movable frame, which is horizontally mounted on the frame via a lead screw. The movable frame can move back and forth via the lead screw. The recycling bin is fixed to the frame via a recycling bin fixing frame. There is a gap between the two ends of the lower baffle plate and the roller brush, and the two ends of the upper baffle plate are fitted together with the roller brush. The separating head is connected to the moving frame via a cylinder unit, which can drive the separating head to move up and down in the vertical direction.

2. The electrode recycling and processing device as described in claim 1, characterized in that, The solvent spraying assembly includes a solvent storage tank, a solvent delivery pump, a solvent feeding pipe, a solvent platform storage grid, a solvent platform pipe, a solvent spraying pump, a solvent pump outlet pipe, a solvent spraying head, and a lead screw; The solvent platform storage compartment is positioned above the negative pressure adsorption workbench; the solvent spray head is mounted on the mobile frame; the solvent platform storage compartment is connected to the solvent spray head via a solvent platform pipe, a solvent spray pump, and a solvent pump outlet pipe; and the solvent storage tank is connected to the solvent platform storage compartment via a solvent delivery pump and a solvent feeding pipe.

3. The electrode recycling and processing device as described in claim 1, characterized in that, The material collection assembly includes a negative pressure extraction pipe, a negative pressure pump, a material pump outlet pipe, and a material recovery box. The material recovery box is connected to the recovery bin via the negative pressure extraction pipe, the negative pressure pump, and the material pump outlet pipe.

4. A method for recovering and processing electrode sheets, characterized in that, Using the electrode recycling and processing apparatus according to any one of claims 1 to 3 includes the following steps: (1) Install the current collector coil and the raw material electrode coil on the current collector recovery assembly; (2) Turn on the negative pressure adsorption assembly and adsorb the raw material electrode above the adsorption hole onto the negative pressure adsorption worktable; (3) Turn on the heating component and heat the negative pressure adsorption workbench through the heat conduction strip to heat the raw material electrode sheet; (4) Turn on the solvent spraying assembly. The sprayed solvent will fully wet the raw material electrode adsorbed on the negative pressure adsorption worktable. (5) Open the separation assembly to separate the positive and negative electrode active materials on the raw material electrode sheet that has been sprayed with solvent; (6) Repeat steps (4) to (5) to perform the spraying solvent, electrode wetting and separation operations until there are no residual active substances on the raw material electrode; (7) Rotate the current collector roll and the raw material electrode roll to wind the raw material electrode with the separated active material onto the current collector roll. Repeat steps (2) to (7) for continuous operation.

5. The electrode recycling method as described in claim 4, characterized in that, In step (3), the negative pressure adsorption workbench is heated to 100~200℃ by a heat-conducting strip.

6. The electrode recycling method as described in claim 4, characterized in that, In step (4), the solvent is a eutectic solvent composed of a hydrogen bond acceptor and a hydrogen bond donor; the hydrogen bond acceptor is choline chloride, and the hydrogen bond donor is at least one of malic acid, ethylene glycol, and acetamide.

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