Lithium battery pole piece and preparation method thereof

Abstract

The invention relates to the technical field of lithium battery preparation, in particular to a lithium battery pole piece and a preparation method thereof.The method comprises the following steps that firstly, multiple raw materials are prepared and selected and screened; step 2, adding the screened qualified raw materials into a solvent; step 3, stirring the solvent and the qualified raw materials to complete preparation of the electrode slurry; step 4, placing the electrode slurry and the metal foil in a smearing device to realize uniform smearing of the electrode slurry on the metal foil; 5, drying the metal foil coated with the electrode slurry; sixthly, the dried metal foil is compressed; seventhly, the compressed metal foil is cut; 8, the cut metal foil is wound and packaged, and preparation of the lithium battery pole piece is completed, two lithium battery pole pieces can be machined at the same time, and the efficiency of preparing the lithium battery pole piece is further improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing technology, and more specifically to a lithium battery electrode and its manufacturing method. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrodes and a non-aqueous electrolyte solution. Lithium-ion batteries can be broadly classified into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. The fifth generation of rechargeable batteries, lithium metal batteries, was developed in 1996. Their safety, specific capacity, self-discharge rate, and performance-price ratio are all superior to lithium-ion batteries. Due to its high technical requirements, only companies in a few countries produce lithium metal batteries. Furthermore, current technology cannot simultaneously process two lithium battery electrodes during the preparation of lithium battery electrodes, resulting in low manufacturing efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a lithium battery electrode and its preparation method. This method can process two lithium battery electrodes simultaneously, further increasing the efficiency of lithium battery electrode preparation.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A method for preparing lithium battery electrodes, the method comprising the following steps:

[0006] Step 1: Prepare various raw materials and select and screen them;

[0007] Step 2: Add the selected and qualified raw materials to the solvent;

[0008] Step 3: Stir the solvent and qualified raw materials to complete the preparation of the electrode slurry;

[0009] Step 4: Place the electrode paste and metal foil into the coating device to evenly coat the electrode paste onto the metal foil;

[0010] Step 5: Dry the metal foil after applying the electrode paste;

[0011] Step 6: Compress the dried metal foil.

[0012] Step 7: Cut the compressed metal foil.

[0013] Step 8: Wrap and package the cut metal foil sheets to complete the preparation of lithium battery electrode sheets.

[0014] The method for preparing lithium battery electrode sheets, wherein the method of using the coating device includes the following steps:

[0015] S1. Add the electrode paste into the three empty storage containers;

[0016] S2. The electrode paste will fall onto two coating rollers I and two coating rollers II respectively;

[0017] S3. Pass the two metal foil sheets through and into contact between the two coating rollers I and the two coating rollers II, respectively;

[0018] S4. Apply electrode paste to the two end faces of two metal foils and dry the coated metal foils.

[0019] Preferably, the various raw materials in step one include active materials, conductive additives, and adhesives.

[0020] Preferably, the solvent in step two is dimethyl ketone.

[0021] Preferably, the mixing process in step three needs to be completed using a mixer.

[0022] Preferably, the metal foil in step four is aluminum foil.

[0023] Preferably, the compression process in step six involves processing the aluminum foil into a foil sheet of the required thickness.

[0024] Preferably, the cutting process in step seven involves processing the aluminum foil into foil sheets of the required size.

[0025] Preferably, the lithium battery electrode prepared by the lithium battery electrode preparation method is composed of electrode slurry coated onto a metal foil.

[0026] Preferably, the coating device includes a supporting slide frame and a fixed support plate fixedly connected to the supporting slide frame. Two sliding support plates are slidably connected to the supporting slide frame. Empty storage buckets are fixedly connected to both the fixed support plate and the two sliding support plates. A three-way pipe is fixedly connected below the middle empty storage bucket. Two coating rollers I are rotatably connected below the three-way pipe. Inclined pipes are fixedly connected below the two outer empty storage buckets. Coating rollers II are rotatably connected to both inclined pipes. Multiple fixed support legs are fixedly connected to the supporting slide frame. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0028] Figure 1 This is a schematic diagram of a process for preparing lithium battery electrode sheets;

[0029] Figure 2 This is a flowchart illustrating the usage of the application device;

[0030] Figure 3 This is a schematic diagram of the overall structure of the applicator of the present invention;

[0031] Figure 4 This is a partial structural schematic diagram of the applicator of the present invention;

[0032] Figure 5 This is a cross-sectional structural diagram of the applicator portion of the present invention;

[0033] Figure 6 This is a schematic diagram of an embodiment for applying electrode paste onto a metal foil.

[0034] Figure 7 This is a partial structural schematic diagram of an embodiment for applying electrode paste onto a metal foil;

[0035] Figure 8 This is another structural schematic diagram of the embodiment that enables the coating of electrode paste onto a metal foil;

[0036] Figure 9 This is a schematic diagram of an embodiment of flattening a metal foil sheet;

[0037] Figure 10 This is a schematic diagram of an embodiment for stirring electrode slurry;

[0038] Figure 11 This is a schematic diagram of an embodiment of coating the outer end faces of two metal foils. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-11 The present invention will be described in further detail below.

[0040] The following is in conjunction with the appendix Figure 1 Detailed description: A method for preparing lithium battery electrodes, the method comprising the following steps:

[0041] Step 1: Prepare various raw materials and select and screen them;

[0042] Step 2: Add the selected and qualified raw materials to the solvent;

[0043] Step 3: Stir the solvent and qualified raw materials to complete the preparation of the electrode slurry;

[0044] Step 4: Place the electrode paste and metal foil into the coating device to evenly coat the electrode paste onto the metal foil;

[0045] Step 5: Dry the metal foil after applying the electrode paste;

[0046] Step 6: Compress the dried metal foil.

[0047] Step 7: Cut the compressed metal foil.

[0048] Step 8: Wrap and package the cut metal foil sheets to complete the preparation of lithium battery electrode sheets.

[0049] The following is in conjunction with the appendix Figure 2 Detailed description: The method for preparing lithium battery electrode sheets, the method of using the coating device includes the following steps:

[0050] S1. Add the electrode paste into the three empty storage containers 104;

[0051] S2, The electrode paste will fall onto two coating rollers I106 and two coating rollers II108 respectively;

[0052] S3. Allow the two metal foil sheets to pass through and contact each other between the two coating rollers I106 and the two coating rollers II108 respectively;

[0053] S4. Apply electrode paste to the two end faces of two metal foils and dry the coated metal foils.

[0054] According to the instruction manual Figure 1 In detail, the various raw materials in step one include active materials, conductive additives, and adhesives.

[0055] According to the instruction manual Figure 1 In detail, the solvent in step two is dimethyl ketone.

[0056] Furthermore, solvents can play a role in dissolving and diluting. In the preparation of electrode materials, it is often necessary to mix active substances with conductive agents, binders, etc., to form a homogeneous electrode slurry. Solvents can dissolve or dilute these components at appropriate temperatures, allowing them to mix thoroughly and thus obtain a uniform electrode slurry. Solvents can also adjust the viscosity of electrode materials. The viscosity of the electrode slurry directly affects the coating performance of the electrode sheet. Too low a viscosity will lead to uneven coating of the electrode sheet, forming an electrode layer of varying thickness, while too high a viscosity will make coating of the electrode sheet difficult or even impossible. The addition of additives can adjust the viscosity of the electrode slurry to suit the coating requirements of the electrode sheet.

[0057] According to the instruction manual Figure 1 In detail, the mixing process in step three requires the use of a mixer.

[0058] Furthermore, the mixer ensures complete mixing of the solvent and qualified raw materials.

[0059] According to the instruction manual Figure 1 In detail, the metal foil in step four is aluminum foil.

[0060] According to the instruction manual Figure 1 In detail, the compression process in step six involves processing the aluminum foil into a foil sheet of the required thickness.

[0061] According to the instruction manual Figure 1 In detail, the cutting process in step seven is to process the aluminum foil into foil sheets of the required size.

[0062] According to the instruction manual Figure 1 The lithium battery electrode prepared by the method described above is composed of an electrode slurry coated onto a metal foil.

[0063] According to the instruction manual Figure 3-11 The detailed description is a detailed description of the application device;

[0064] The applicator includes a supporting slide frame 101 and a fixed support plate 102 welded to the supporting slide frame 101. Two sliding support plates 103 are slidably connected to the supporting slide frame 101 via a sliding groove. Empty storage buckets 104 are welded to both the fixed support plate 102 and the two sliding support plates 103. A three-way pipe 105 is welded to the lower part of the middle empty storage bucket 104. Two applicator rollers I106 are rotatably connected to the lower part of the three-way pipe 105 via a shaft. Inclined pipes 107 are welded to the lower part of the two outer empty storage buckets 104. Applicator rollers II108 are rotatably connected to the two inclined pipes 107 via a shaft. Multiple fixed support legs 109 are welded to the supporting slide frame 101.

[0065] Furthermore, the supporting slide frame 101 provides a fixed space for the fixed support plate 102 and a sliding space for the two sliding support plates 103. Both the fixed support plate 102 and the two sliding support plates 103 provide a fixed space for the empty storage bins 104. The three empty storage bins 104 provide storage space for the electrode paste. A valve is installed on the three-way pipe 105. After opening the valve, the electrode paste in the empty storage bins 104 will fall onto the two coating rollers 1106 through the three-way pipe 105. Valves are installed on both inclined pipes 107, and the two empty storage bins 104 located at their outer ends... The electrode paste inside 04 will be discharged through two inclined pipes 107 and finally fall onto two coating rollers II 108. Two metal foils can pass through and contact the two coating rollers I 106 and II 108 respectively. The three-way pipe 105 and the two inclined pipes 107 are provided with slots. The electrode paste falls through multiple slots and onto the two coating rollers I 106 and II 108. Multiple fixed legs 109 can be used to support and fix the support slide frame 101, so that the device can be placed stably on the ground.

[0066] Electrode slurry is stored in three empty storage containers 104. Two metal foils are passed between two coating rollers I106 and two coating rollers II108. The positions of the two sliding plates 103 are adjusted according to the thickness of the two metal foils to ensure that the two metal foils are in contact with the two coating rollers I106 and two coating rollers II108 respectively. The valves on the three-way pipe 105 and the two inclined pipes 107 are opened, and the electrode slurry in the three empty storage containers 104 will fall onto the two coating rollers I106 and two coating rollers II108 respectively. Then, the two metal foils are moved to contact the two coating rollers I106 and two coating rollers II108, so that the electrode slurry can be evenly coated on both ends of the two metal foils, completing the rough processing of the electrode sheet.

[0067] The outer ends of the two sliding cross plates 103 are fixedly connected to the internal threaded cavities 201 by welding. The two ends of the supporting slide frame 101 are rotatably connected to the transverse sliding screws 202 through bearing holes. The two transverse sliding screws 202 are respectively connected to the two internal threaded cavities 201 by threads.

[0068] Furthermore, rotating the two transverse lead screws 202 will drive the two internal threaded cavities 201 to move laterally, and the two internal threaded cavities 201 moving laterally will drive the two sliding cross plates 103 to move, thereby changing the position of the two coating rollers II 108, ensuring that the two metal foils can contact the two coating rollers I 106 and the two coating rollers II 108 respectively.

[0069] Each of the three empty storage bins 104 is fixedly connected to an upper cover plate 301 by threads. Each of the three upper cover plates 301 is fixedly connected to a reduction motor 302 by a flange plate. Each of the three reduction motors 302 has a stirring rod 303 fixedly connected to its output shaft by a keyway and a snap ring. The three stirring rods 303 are located inside the three empty storage bins 104 respectively.

[0070] Furthermore, the three upper cover plates 301 can seal the openings above the three empty storage tanks 104, ensuring that debris cannot enter the three empty storage tanks 104. The three upper cover plates 301 can provide fixed space for the three reduction motors 302. After the three reduction motors 302 are started, they can drive the three stirring rods 303 to rotate. Each of the three stirring rods 303 is equipped with multiple horizontal plates, which further enhances the stirring efficiency of the electrode slurry in the three empty storage tanks 104 and prevents the electrode slurry from solidifying in the three empty storage tanks 104. If the electrode slurry solidifies, it will not be able to be discharged.

[0071] Below the two empty storage bins 104 at the outer end, there are bearing seats 401 fixedly connected by welding. Each bearing seat 401 is rotatably connected to a limit roller 402 via a shaft.

[0072] Furthermore, the two bearing seats 401 can provide rotation space for the two limiting rollers 402, and the two limiting rollers 402 can be used to limit the two metal foils to prevent the two metal foils from contacting other parts, which would prevent the two metal foils from moving normally or cause irreversible damage to the two metal foils.

[0073] Below the two empty storage bins 104 at the outer end, there are support slide plates 501 fixedly connected by welding. Four lifting plates 502 are slidably connected to the two support slide plates 501 through the slide groove. The positions of the eight lifting plates 502 are one-to-one. A flattening roller 503 is rotatably connected between the corresponding two lifting plates 502 through the shaft. Two bidirectional lead screws 504 are rotatably connected to the two support slide plates 501. The four bidirectional lead screws 504 are respectively connected to the eight lifting plates 502 through threads.

[0074] Furthermore, the two supporting slide plates 501 serve as load-bearing connections, providing sliding space for the eight lifting plates 502. The eight lifting plates 502 provide rotation space for the multiple flattening rollers 503. The multiple flattening rollers 503 can be used to flatten the two metal foils, ensuring that the electrode paste on the two metal foils is uniform. Rotating the four bidirectional lead screws 504 can drive the multiple lifting plates 502 to slide up or down simultaneously, thereby changing the position of the multiple flattening rollers 503 and thus changing the distance between the multiple flattening rollers 503, thereby achieving the flattening treatment of two metal foils of different thicknesses.

Claims

1. A method for preparing lithium battery electrodes, characterized in that, The method includes the following steps: Step 1: Prepare various raw materials and select and screen them; Step 2: Add the selected and qualified raw materials to the solvent; Step 3: Stir the solvent and qualified raw materials to complete the preparation of the electrode slurry; Step 4: Place the electrode paste and metal foil into the coating device to evenly coat the electrode paste onto the metal foil; Step 5: Dry the metal foil after applying the electrode paste; Step 6: Compress the dried metal foil. Step 7: Cut the compressed metal foil. Step 8: Wrap and package the cut metal foil sheets to complete the preparation of lithium battery electrode sheets.

2. The method for preparing a lithium battery electrode according to claim 1, characterized in that, The method of using the application device includes the following steps: S1. Add the electrode paste into the three empty storage containers (104); S2, the electrode paste will fall onto two coating rollers I (106) and two coating rollers II (108) respectively; S3. Pass the two metal foils through and into contact between the two coating rollers I (106) and the two coating rollers II (108), respectively; S4. Apply electrode paste to the two end faces of two metal foils and dry the coated metal foils.

3. The method for preparing a lithium battery electrode according to claim 1, characterized in that: The raw materials used in step one include active materials, conductive additives, and adhesives.

4. The method for preparing a lithium battery electrode according to claim 1, characterized in that: The solvent in step two is dimethyl ketone.

5. The method for preparing a lithium battery electrode according to claim 1, characterized in that: The mixing process in step three requires the use of a mixer.

6. The method for preparing a lithium battery electrode according to claim 1, characterized in that: The metal foil in step four is aluminum foil.

7. The method for preparing a lithium battery electrode according to claim 1, characterized in that: The internal compression process in step six involves processing the aluminum foil into foil sheets of the required thickness.

8. The method for preparing a lithium battery electrode according to claim 1, characterized in that: The seventh step, internal cutting, involves processing the aluminum foil into foil sheets of the required size.

9. The lithium battery electrode prepared by the lithium battery electrode preparation method according to claim 1, characterized in that: The lithium battery electrode is composed of electrode paste coated onto a metal foil.

10. The method for preparing a lithium battery electrode according to claim 2, characterized in that: The applicator includes a support slide frame (101) and a fixed support plate (102) fixedly connected to the support slide frame (101). Two sliding support plates (103) are slidably connected to the support slide frame (101). Empty storage buckets (104) are fixedly connected to both the fixed support plate (102) and the two sliding support plates (103). A three-way pipe (105) is fixedly connected below the middle empty storage bucket (104). Two applicator rollers I (106) are rotatably connected below the three-way pipe (105). Inclined pipes (107) are fixedly connected below the two outer empty storage buckets (104). Applicator rollers II (108) are rotatably connected to both inclined pipes (107). Multiple fixed support legs (109) are fixedly connected to the support slide frame (101).

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