Preparation method of lithium-manganese button cell positive electrode material

Abstract

The invention belongs to the technical field of battery manufacturing, and discloses a lithium-manganese button battery positive electrode material preparation method, which comprises: S1, adding electrolytic manganese dioxide, a graphene quantum dot and carbon nanofiber composite conductive agent, nanometer TiO particles, nanometer LLZO powder, and carbon-coated nanometer silicon particles into a mixing cylinder according to a mass ratio of 85: 10: 5: 2: 1, and uniformly stirring; through cooperation of structures such as a hydraulic cylinder, a storage box and a discharging barrel, the device can push the storage box to move downwards along a supporting rod through the hydraulic cylinder, so that the discharging barrel is accurately in butt joint and communication with a connecting rod, and then an extrusion disc is driven to move upwards through a first air cylinder in the storage box; a binder solution is accurately fed into the mixing barrel through the discharging barrel and the connecting rod, and meanwhile, an ultrasonic probe at the bottom end of the storage box is matched, so that ultrasonic dispersion of slurry is realized in the adding process, and the binder and dry-mixed powder are uniformly mixed, so that the purpose of conveniently and accurately controlling the adding process of the binder solution by the device is achieved.

Description

Technical Field

[0001] This invention belongs to the field of battery manufacturing technology, specifically a method for preparing positive electrode material for lithium manganese button batteries. Background Art

[0002] With the rapid development of technology, small electronic devices such as smartwatches, hearing aids, and remote controls are increasingly demanding high-performance, long-life, safe, and stable power supplies. Lithium manganese button batteries are widely used in these fields due to their high energy density, long shelf life, and good discharge performance.

[0003] Publication No. CN116598497A discloses a lithium manganese button cell cathode material and its preparation method. The lithium manganese button cell cathode material comprises the following raw materials in parts by weight: 4-10 parts of conductive agent, 80.5-95 parts of cathode active material, and 0.5-10.5 parts of binder. The cathode material is doped with fluorinated graphene, which utilizes the high specific surface area and microporous structure of fluorinated graphene to increase the contact interface between the cathode material and the electrolyte, accelerate the lithium-ion diffusion rate, reduce the internal resistance of the battery, improve the discharge performance of the cathode material, extend the discharge time, and improve the stability and continuity of discharge. In addition, the integrated mixing and grinding method can obtain a cathode material with suitable particle size and uniform mixing, ensuring that the subsequently prepared lithium manganese button cells have stable discharge performance and good batch consistency.

[0004] However, this preparation method has low utilization of active materials in the cathode material, the electron transport efficiency needs to be improved, the battery cycle life is limited, and the preparation process is relatively complex and costly, making it difficult to meet the ever-increasing market demand. Therefore, a lithium manganese button battery cathode material preparation device is needed to quickly and stably mix the materials and improve the effect of the finished material through various mixing methods. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a method for preparing a lithium manganese button cell cathode material.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a lithium manganese button cell cathode material, comprising the following steps: S1. Electrolytic manganese dioxide, graphene quantum dots and carbon nanofiber composite conductive agent, nano TiO2 particles, nano-sized LLZO powder, and carbon-coated nano silicon particles are added to a mixing drum in a mass ratio of 85:10:5:2:1. The mixture is then dry-mixed for 30-40 minutes at a speed of 2000-3000 rpm to ensure that the components are initially and evenly mixed. S2. Dissolve the PLGA binder in an appropriate amount of dichloromethane solvent to prepare a binder solution with a mass concentration of 10%. Add the binder solution to the dry-mixed powder and turn on the ultrasonic probe. Under the condition of 200-300 watts, ultrasonically disperse for 40-60 minutes to form a uniform and stable positive electrode slurry. Perform high-pressure homogenization on the ultrasonically dispersed positive electrode slurry. Use a high-pressure homogenizer to process it 2-3 times under the condition of 80-100MPa. S3. The positive electrode slurry is uniformly coated on the pretreated aluminum foil current collector using a scraping method. The coating thickness is controlled between 100-150 micrometers. After coating, the aluminum foil is placed in a vacuum drying oven and dried for 2-3 hours at a temperature of 60-80℃ and a vacuum degree of -0.08-0.1MPa to allow the solvent to evaporate completely, resulting in a pre-formed positive electrode sheet. The pre-formed positive electrode sheet after drying is then subjected to low-temperature plasma treatment using argon as the plasma source. Surface modification is performed under conditions of 50-80W power and 5-10 minutes of treatment time. S4. Place the pre-formed positive electrode sheet into a tube furnace and heat it to 330-390°C at a heating rate of 5°C / min under argon protection. Hold it at this temperature for 1-2 hours to perform low-temperature sintering treatment, which further solidifies the binder and enhances the bonding force between the active material, the conductive agent, and the current collector. Then, cool the tube furnace to room temperature at a cooling rate of 10°C / min and remove the positive electrode sheet. S5. The heat-treated positive electrode sheet is rolled using a high-precision rolling mill. The rolling pressure is controlled at 5-8 MPa. The density of the positive electrode sheet is brought to 2.5-3.2 g / cm³ through rolling. The rolled positive electrode sheet is then subjected to a second low-temperature drying process. It is placed in a vacuum drying oven and dried for 1-1.5 hours at a temperature of 50-60℃ and a vacuum degree of -0.09-0.1 MPa. Finally, according to the actual battery specifications, the rolled positive electrode sheet is cut into appropriate sizes and shapes using a cutting machine to obtain the final lithium manganese button cell positive electrode sheet.

[0007] The present invention also provides a lithium manganese button cell cathode material preparation device, including a mixing cylinder, a base fixed to the bottom end of the mixing cylinder, a support rod fixed to the top end of the base, a top plate fixed to the top end of the support rod, a lifting mechanism installed at the bottom end of the top plate, a mixing mechanism installed inside the base, an unfolding mechanism fixed to the top end of the mixing mechanism, and a control panel fixed to the outside of the mixing cylinder. The lifting mechanism includes a hydraulic cylinder, a storage box, and a discharge cylinder. The hydraulic cylinder is fixed to the bottom end of the top plate, the storage box is fixed to the bottom end of the hydraulic cylinder, and the discharge cylinder is fixed inside the storage box. The hybrid mechanism includes a servo motor, a connecting rod, and a trigger plate. The servo motor is fixed inside the base, the rotating end of the servo motor is fixed with the connecting rod, and the outside of the connecting rod is fixed with the trigger plate.

[0008] Preferably, a first cylinder is fixed to the bottom of the storage box, a pressing plate is fixed to the top of the first cylinder, and an ultrasonic probe is fixed to the bottom of the storage box.

[0009] Preferably, the inner wall of the storage box is attached to the outer wall of the support rod, the storage box and the support rod are slidably connected, the top of the discharge cylinder is connected to the storage box, and four sets of the first cylinder are arranged in a ring array.

[0010] Preferably, the extrusion disc and the storage box are slidably connected, several sets of ultrasonic probes are provided, the ultrasonic probes are distributed in a ring array, and the bottom end of the discharge cylinder is connected to a connecting rod.

[0011] Preferably, an extrusion rod is slidably connected inside the mixing cylinder, a return spring is fixed to one end of the extrusion rod, and a scraper plate is fixed to the outside of the connecting rod.

[0012] Preferably, the trigger disc has four sets of concave grooves, and the extrusion rods are provided in four sets, with the extrusion rods arranged in a circular array about the central axis of the mixing cylinder.

[0013] Preferably, the return spring is used to squeeze the squeezing rod and keep it moving outward, and the scraper plates are provided in several groups, which are arranged in a ring array about the central axis of the connecting rod.

[0014] Preferably, the unfolding mechanism includes a first mounting base, a first stirring rod, and a second cylinder. The first mounting base is fixed to the outside of the connecting rod, and the first stirring rod is hinged inside the first mounting base. The bottom end of the first stirring rod is hinged to the second cylinder. The mixing mechanism is fixed to the outside of the second mounting base, and the second stirring rod is hinged inside the second mounting base.

[0015] Preferably, a second cylinder is hinged to the top of the second stirring rod, and four sets of the first and second mounting seats are provided, arranged in a circular array.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention, through the coordinated arrangement of a hydraulic cylinder, a storage box, and a discharge cylinder, enables the device to push the storage box downwards along the support rod via the hydraulic cylinder, ensuring accurate connection and communication between the discharge cylinder and the connecting rod. Subsequently, the first cylinder inside the storage box drives the extrusion plate upwards, precisely delivering the binder solution into the mixing cylinder via the discharge cylinder and the connecting rod. Simultaneously, the ultrasonic probe at the bottom of the storage box enables ultrasonic dispersion of the slurry during the addition process, ensuring uniform mixing of the binder and dry powder. This achieves the goal of facilitating precise control of the binder solution addition process.

[0017] This invention, through the coordinated arrangement of a servo motor, connecting rod, trigger plate, and other structures, enables the device to drive the connecting rod to rotate via the servo motor. This rotation causes the external scraper plate to rotate, scraping away the raw material at the bottom of the mixing cylinder and preventing material deposition. Simultaneously, the connecting rod drives the trigger plate to rotate. The concave groove of the trigger plate engages with the extrusion rod inside the mixing cylinder. Under the action of the return spring, the extrusion rod reciprocates, extruding and stirring the raw material. This significantly improves the uniformity and efficiency of dry mixing, thereby facilitating the device to efficiently complete the dry mixing operation of raw materials.

[0018] This invention, through the combination of a first mounting base, a first stirring rod, and a second cylinder, enables the device to hinge the first stirring rod to the connecting rod via the first mounting base. The two ends of the second cylinder are respectively hinged to the first and second stirring rods. By controlling the extension and retraction of the second cylinder, the first and second stirring rods can be driven to expand or contract, thereby changing the stirring radius and ensuring that the raw materials in different areas of the mixing drum are fully stirred, further improving the mixing uniformity. This achieves the purpose of facilitating flexible adjustment of the stirring range and enhancing the mixing effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall internal cross-sectional structure of the present invention; Figure 3 This is a schematic cross-sectional view of the overall internal connection state of the present invention; Figure 4 This is a schematic diagram of the lifting mechanism structure of the present invention; Figure 5 For the present invention Figure 3 Enlarged cross-sectional view of a portion of point A in the middle section; Figure 6 This is a schematic diagram of the internal cross-sectional structure of the mixing cylinder of the present invention; Figure 7 This is a schematic diagram of the hybrid mechanism structure of the present invention; Figure 8 This is a schematic diagram of the unfolding mechanism of the present invention; Figure 9 This is a schematic diagram of the hybrid mechanism of the present invention.

[0020] In the diagram: 1. Base; 2. Mixing cylinder; 3. Support rod; 4. Top plate; 5. Lifting mechanism; 501. Hydraulic cylinder; 502. Storage box; 503. Discharge cylinder; 504. First cylinder; 505. Extrusion plate; 506. Ultrasonic probe; 6. Mixing mechanism; 601. Servo motor; 602. Connecting rod; 603. Trigger plate; 604. Extrusion rod; 605. Return spring; 606. Scraper plate; 7. Unfolding mechanism; 701. First mounting base; 702. First stirring rod; 703. Second cylinder; 704. Second mounting base; 705. Second stirring rod; 8. Control panel. Detailed Implementation

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figures 1 to 9 As shown, this invention provides a method for preparing a lithium manganese button cell cathode material, comprising the following steps: S1. Electrolytic manganese dioxide, graphene quantum dots and carbon nanofiber composite conductive agent, nano TiO2 particles, nano-sized LLZO powder, and carbon-coated nano silicon particles are added to mixing cylinder 2 in a mass ratio of 85:10:5:2:1. The mixture is then dry-mixed for 30-40 minutes at a speed of 2000-3000 rpm to ensure that the components are initially mixed evenly. S2. Dissolve the PLGA binder in an appropriate amount of dichloromethane solvent to prepare a binder solution with a mass concentration of 10%. Add the binder solution to the dry-mixed powder and turn on the ultrasonic probe 506. Under the condition of 200-300 watts, ultrasonically disperse for 40-60 minutes to form a uniform and stable positive electrode slurry. Perform high-pressure homogenization on the ultrasonically dispersed positive electrode slurry. Use a high-pressure homogenizer to process it 2-3 times under the condition of 80-100MPa. S3. The positive electrode slurry is uniformly coated on the pretreated aluminum foil current collector using a scraping method. The coating thickness is controlled between 100-150 micrometers. After coating, the aluminum foil is placed in a vacuum drying oven and dried for 2-3 hours at a temperature of 60-80℃ and a vacuum degree of -0.08-0.1MPa to allow the solvent to evaporate completely, resulting in a pre-formed positive electrode sheet. The pre-formed positive electrode sheet after drying is then subjected to low-temperature plasma treatment using argon as the plasma source. Surface modification is performed under conditions of 50-80W power and 5-10 minutes of treatment time. S4. Place the pre-formed positive electrode sheet into a tube furnace and heat it to 330-390°C at a heating rate of 5°C / min under argon protection. Hold it at this temperature for 1-2 hours to perform low-temperature sintering treatment, which further solidifies the binder and enhances the bonding force between the active material, the conductive agent, and the current collector. Then, cool the tube furnace to room temperature at a cooling rate of 10°C / min and remove the positive electrode sheet. S5. The heat-treated positive electrode sheet is rolled using a high-precision rolling mill. The rolling pressure is controlled at 5-8 MPa. The density of the positive electrode sheet is brought to 2.5-3.2 g / cm³ through rolling. The rolled positive electrode sheet is then subjected to a second low-temperature drying process. It is placed in a vacuum drying oven and dried for 1-1.5 hours at a temperature of 50-60℃ and a vacuum degree of -0.09-0.1 MPa. Finally, according to the actual battery specifications, the rolled positive electrode sheet is cut into appropriate sizes and shapes using a cutting machine to obtain the final lithium manganese button cell positive electrode sheet.

[0023] like Figures 1 to 9 As shown, the present invention also provides a lithium manganese button cell cathode material preparation device, including a mixing cylinder 2, a base 1 fixed to the bottom end of the mixing cylinder 2, a support rod 3 fixed to the top end of the base 1, a top plate 4 fixed to the top end of the support rod 3, a lifting mechanism 5 installed at the bottom end of the top plate 4, a mixing mechanism 6 installed inside the base 1, an unfolding mechanism 7 fixed to the top end of the mixing mechanism 6, and a control panel 8 fixed to the outside of the mixing cylinder 2.

[0024] like Figures 1 to 5 As shown, the lifting mechanism 5 includes a hydraulic cylinder 501, a storage box 502, and a discharge cylinder 503. The hydraulic cylinder 501 is fixed to the bottom end of the top plate 4. The storage box 502 is fixed to the bottom end of the hydraulic cylinder 501. The discharge cylinder 503 is fixed inside the storage box 502. The bottom end of the storage box 502 is fixed to a first cylinder 504. The inner wall of the storage box 502 is attached to the outer wall of the support rod 3. The storage box 502 and the support rod 3 are slidably connected. The top end of the discharge cylinder 503 is connected to the storage box 502. Four sets of first cylinders 504 are provided, and the first cylinders 504 are distributed in a ring array.

[0025] like Figures 1 to 5As shown, a pressing disc 505 is fixed to the top of the first cylinder 504, and an ultrasonic probe 506 is fixed to the bottom of the storage box 502. The pressing disc 505 and the storage box 502 are slidably connected. Several sets of ultrasonic probes 506 are provided, and the ultrasonic probes 506 are distributed in a ring array. The bottom of the discharge cylinder 503 is connected to a connecting rod 602.

[0026] The above scheme is adopted as follows: After the raw materials are dry-mixed, the binder solution is added into the storage box 502. The hydraulic cylinder 501 is activated to push the storage box 502 downward, so that the discharge cylinder 503 is connected to the connecting rod 602. After the connection is completed, the first cylinder 504 is activated to drive the extrusion plate 505 upward, thereby lifting the binder solution inside the storage box 502 and allowing it to enter the inlet at the top of the discharge cylinder 503. It is then discharged into the mixing cylinder 2 through the connecting rod 602, so that the dry-mixed powder comes into contact with the binder solution. At the same time, the ultrasonic probe 506 is activated to output ultrasonic waves, further refining the particle agglomerates in the slurry, making the components more evenly dispersed, and improving the stability and consistency of the slurry.

[0027] like Figures 1 to 9 As shown, the mixing mechanism 6 includes a servo motor 601, a connecting rod 602, and a trigger disk 603. The servo motor 601 is fixed inside the base 1. The connecting rod 602 is fixed to the rotating end of the servo motor 601. The trigger disk 603 is fixed to the outside of the connecting rod 602. An extrusion rod 604 is slidably connected inside the mixing cylinder 2. The trigger disk 603 has four sets of concave grooves. There are four sets of extrusion rods 604. The extrusion rods 604 are arranged in a circular array about the central axis of the mixing cylinder 2. A return spring 605 is fixed to one end of the extrusion rod 604. A scraper plate 606 is fixed to the outside of the connecting rod 602. The return spring 605 is used to squeeze the extrusion rod 604 and keep it moving outward. Several sets of scraper plates 606 are arranged in a circular array about the central axis of the connecting rod 602.

[0028] The above scheme is adopted as follows: after the raw materials are added to the mixing cylinder 2, the servo motor 601 is started to drive the connecting rod 602 and the trigger disk 603 to rotate. The connecting rod 602 drives the first stirring rod 702 and the second stirring rod 705 to rotate, thereby stirring and mixing the raw materials. Due to the shape of the trigger disk 603, it continuously squeezes and contacts the extrusion rod 604 during rotation, so that the extrusion rod 604 reciprocates through the energy release of the return spring 605 and the contact of the trigger disk 603, thereby improving the mixing efficiency of the raw materials. The bottom scraper 606 follows the rotation of the connecting rod 602 to scrape the bottom of the mixing cylinder 2, avoiding the phenomenon of uneven mixing of raw materials.

[0029] like Figures 1 to 8As shown, the unfolding mechanism 7 includes a first mounting base 701, a first stirring rod 702, and a second cylinder 703. The first mounting base 701 is fixed to the outside of the connecting rod 602. The first stirring rod 702 is hinged inside the first mounting base 701. The second cylinder 703 is hinged to the bottom end of the first stirring rod 702. The mixing mechanism 6 is fixed to the outside of a second mounting base 704. The second stirring rod 705 is hinged inside the second mounting base 704. The second cylinder 703 is hinged to the top end of the second stirring rod 705. There are four sets of first mounting bases 701 and second mounting bases 704, which are arranged in a circular array.

[0030] The above solution involves activating the second cylinder 703, which, through its hinged connection with the first stirring rod 702 and the second stirring rod 705, allows the first stirring rod 702 and the second stirring rod 705 to expand and contract, thereby changing the range of the first stirring rod 702 and the second stirring rod 705 in stirring the raw materials, and thus improving the stirring effect of the device on the raw materials.

[0031] The working principle and usage process of this invention are as follows: First, after adding the raw materials to the mixing cylinder 2, the servo motor 601 is started to drive the connecting rod 602 and the trigger disk 603 to rotate. The connecting rod 602 drives the first stirring rod 702 and the second stirring rod 705 to rotate, thereby stirring and mixing the raw materials. Due to the shape of the trigger disk 603, it continuously squeezes and contacts the extrusion rod 604 during rotation, causing the extrusion rod 604 to reciprocate through the energy release of the return spring 605 and the contact of the trigger disk 603, thereby improving the efficiency of raw material mixing. The bottom scraper 606 follows the rotation of the connecting rod 602 to scrape the bottom of the mixing cylinder 2, avoiding uneven mixing of raw materials. The second cylinder 703 is started, and through the hinge between the second cylinder 703 and the first stirring rod 702 and the second stirring rod 705, the first stirring rod 702 and the second stirring rod 705 can expand and contract, thereby changing the range of the first stirring rod 702 and the second stirring rod 705 in stirring the raw materials, thereby improving the effect of the device in stirring the raw materials.

[0032] Next, after the raw materials are dry-mixed, the binder solution is added into the storage box 502. The hydraulic cylinder 501 is activated to push the storage box 502 downwards, thereby connecting the discharge cylinder 503 with the connecting rod 602. After connection, the first cylinder 504 is activated to move the extrusion plate 505 upwards, lifting the binder solution inside the storage box 502 and allowing it to enter the inlet at the top of the discharge cylinder 503. The solution is then discharged into the mixing cylinder 2 through the connecting rod 602, ensuring contact between the dry-mixed powder and the binder solution. Simultaneously, the ultrasonic probe 506 is activated. Electrical energy is input into the ultrasonic generator of the ultrasonic probe 506 and converted into electrical energy. The high-frequency electrical signal is converted into a high-frequency electrical signal that matches the transducer of the ultrasonic probe 506, providing an energy source for subsequent vibration. When the high-frequency electrical signal passes through the piezoelectric ceramic of the transducer, the ceramic will undergo high-frequency expansion and contraction vibration with the frequency of the electrical signal, converting electrical energy into mechanical vibration. The amplitude is amplified by the amplitude transformer of the ultrasonic probe 506, and the vibration energy is efficiently transmitted to the tool head of the ultrasonic probe 506. The tool head of the ultrasonic probe 506 directly applies the amplified mechanical vibration to the mixed raw material, so that the vibration energy propagates rapidly in the raw material, further refining the particle agglomerates in the slurry, making the components more evenly dispersed, and improving the stability and consistency of the slurry.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a positive electrode material for a lithium manganese button cell, characterized in that: The following steps are involved: S1. Electrolytic manganese dioxide, graphene quantum dots and carbon nanofiber composite conductive agent, nano TiO2 particles, nano-grade LLZO powder, and carbon-coated nano silicon particles are added to the mixing cylinder (2) in a mass ratio of 85:10:5:2:

1. The mixture is then dry-mixed for 30-40 minutes at a speed of 2000-3000 rpm to ensure that the components are initially mixed evenly. S2. Dissolve the PLGA binder in an appropriate amount of dichloromethane solvent to prepare a binder solution with a mass concentration of 10%. Add the binder solution to the dry-mixed powder and turn on the ultrasonic probe (506) at a power of 200-300 watts. Disperse the mixture ultrasonically for 40-60 minutes to form a positive electrode slurry. Perform high-pressure homogenization on the ultrasonically dispersed positive electrode slurry. Use a high-pressure homogenizer to process the mixture 2-3 times at a pressure of 80-100 MPa. S3. The positive electrode slurry is coated onto the pretreated aluminum foil current collector using a scraping method. The coating thickness is controlled between 100-150 micrometers. After coating, the aluminum foil is placed in a vacuum drying oven and dried for 2-3 hours at a temperature of 60-80℃ and a vacuum degree of -0.08-0.1MPa to allow the solvent to evaporate completely, resulting in a pre-formed positive electrode sheet. The pre-formed positive electrode sheet is then subjected to low-temperature plasma treatment using argon as the plasma source. Surface modification is performed at a power of 50-80W and a treatment time of 5-10 minutes. S4. Place the pre-formed positive electrode sheet into a tube furnace and heat it to 330-390°C at a heating rate of 5°C / min under argon protection. Hold it at this temperature for 1-2 hours to perform low-temperature sintering treatment, which further solidifies the binder. Then cool the tube furnace to room temperature at a cooling rate of 10°C / min and remove the positive electrode sheet. S5. The heat-treated positive electrode sheet is rolled using a high-precision rolling mill. The rolling pressure is controlled at 5-8 MPa. The density of the positive electrode sheet is brought to 2.5-3.2 g / cm³ through rolling. The rolled positive electrode sheet is then subjected to a second low-temperature drying process. It is placed in a vacuum drying oven and dried for 1-1.5 hours at a temperature of 50-60℃ and a vacuum degree of -0.09-0.1 MPa. Finally, according to the actual battery specifications, the rolled positive electrode sheet is cut into appropriate sizes and shapes using a cutting machine to obtain the final lithium manganese button cell positive electrode sheet.

2. A lithium manganese button cell cathode material preparation apparatus, applied to the lithium manganese button cell cathode material preparation method as described in claim 1, comprising a mixing cylinder (2), characterized in that: The bottom end of the mixing cylinder (2) is fixed with a base (1), the top end of the base (1) is fixed with a support rod (3), the top end of the support rod (3) is fixed with a top plate (4), the bottom end of the top plate (4) is equipped with a lifting mechanism (5), the inside of the base (1) is equipped with a mixing mechanism (6), the top end of the mixing mechanism (6) is fixed with an unfolding mechanism (7), and the outside of the mixing cylinder (2) is fixed with a control panel (8). The lifting mechanism (5) includes a hydraulic cylinder (501), a storage box (502) and a discharge cylinder (503). The hydraulic cylinder (501) is fixed at the bottom of the top plate (4). The storage box (502) is fixed at the bottom of the hydraulic cylinder (501). The discharge cylinder (503) is fixed inside the storage box (502). The mixing mechanism (6) includes a servo motor (601), a connecting rod (602) and a trigger disk (603). The servo motor (601) is fixed inside the base (1). The rotating end of the servo motor (601) is fixed with the connecting rod (602). The outside of the connecting rod (602) is fixed with the trigger disk (603).

3. The apparatus for preparing lithium manganese button cell cathode material according to claim 2, characterized in that: The bottom of the storage box (502) is fixed with a first cylinder (504), the top of the first cylinder (504) is fixed with a pressing plate (505), and the bottom of the storage box (502) is fixed with an ultrasonic probe (506).

4. The apparatus for preparing lithium manganese button cell cathode material according to claim 3, characterized in that: The inner wall of the storage box (502) is attached to the outer wall of the support rod (3), the storage box (502) and the support rod (3) are slidably connected, the top of the discharge cylinder (503) is connected to the storage box (502), and the first cylinder (504) is provided in four sets, and the first cylinder (504) is distributed in a ring array.

5. The apparatus for preparing a lithium manganese button cell cathode material according to claim 3, characterized in that: The extrusion disc (505) and the storage box (502) are slidably connected. Several sets of ultrasonic probes (506) are provided. The ultrasonic probes (506) are arranged in a ring array. The bottom end of the discharge cylinder (503) is connected to a connecting rod (602).

6. The apparatus for preparing lithium manganese button cell cathode material according to claim 2, characterized in that: The mixing cylinder (2) is slidably connected to an extrusion rod (604), one end of which is fixed with a return spring (605), and the connecting rod (602) is fixed with a scraper plate (606).

7. The apparatus for preparing lithium manganese button cell cathode material according to claim 6, characterized in that: The trigger plate (603) has four sets of concave grooves, and the extrusion rods (604) are provided in four sets. The extrusion rods (604) are arranged in a ring array about the central axis of the mixing cylinder (2).

8. The apparatus for preparing lithium manganese button cell cathode material according to claim 6, characterized in that: The return spring (605) is used to squeeze the squeezing rod (604) and keep it moving outward. The scraper plate (606) is provided in several groups and the scraper plate (606) is arranged in a ring array about the central axis of the connecting rod (602).

9. The apparatus for preparing lithium manganese button cell cathode material according to claim 2, characterized in that: The unfolding mechanism (7) includes a first mounting base (701), a first stirring rod (702), and a second cylinder (703). The first mounting base (701) is fixed to the outside of the connecting rod (602). The first stirring rod (702) is hinged inside the first mounting base (701). The second cylinder (703) is hinged to the bottom end of the first stirring rod (702). The mixing mechanism (6) is fixed to the outside of a second mounting base (704). The second stirring rod (705) is hinged inside the second mounting base (704).

10. The apparatus for preparing a lithium manganese button cell cathode material according to claim 9, characterized in that: The top end of the second stirring rod (705) is hinged to a second cylinder (703), and four sets of the first mounting base (701) and the second mounting base (704) are provided, which are arranged in a ring array.

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