Magnetic stirring preparation method of positive electrode slurry of button cell

Abstract

The invention relates to the field of lithium battery positive electrode material production, in particular to a magnetic stirring preparation method of button cell positive electrode slurry, which is applied to preparation of slurry related to lithium battery positive electrode material performance detection, and comprises the following steps: respectively weighing target powder and an additive, opening a glass bottle cover, putting magnetons, sequentially adding the weighed materials into a glass bottle, and uniformly stirring; after the bottle cap is tightened, the glass bottle is placed in the glass bottle placing area of the magnetic stirring base, the magnetic stirrer is operated for stirring, and a plurality of materials can be stirred at the same time; according to the magnetic stirring preparation method for the positive electrode slurry of the button cell, a plurality of materials can be subjected to slurry mixing at the same time, so that the slurry mixing efficiency is greatly improved; instability caused by manual size mixing is made up, and the method is easy to master and understand; and meanwhile, material fusion is better promoted, the size mixing effect is improved, and reliable guarantee is provided for subsequent performance detection of the lithium battery positive electrode material.

Description

Technical Field

[0001] This invention relates to the field of lithium battery cathode material production, specifically a magnetic stirring method for preparing coin cell cathode slurry. Background Technology

[0002] In the production of lithium battery cathode materials, slurry preparation is an important operation related to material performance testing. Its operation results directly affect the accuracy and reliability of subsequent material performance testing, and it is an indispensable part of the lithium battery cathode material production and performance testing process.

[0003] Currently, the preparation of cathode materials for coin cells is done manually. This method is not only time-consuming and labor-intensive, but also places excessive demands on the operator's skill level, resulting in low preparation efficiency. Furthermore, because the effectiveness of manual preparation is highly dependent on the operator's technique, ensuring the stability required for material performance testing further exacerbates this reliance, making it difficult to effectively guarantee stability during the preparation process. This may consequently affect the results of subsequent material performance testing. Therefore, in light of these shortcomings, there is an urgent need to develop a magnetic stirring method for preparing coin cell cathode slurry to overcome the deficiencies in current practical applications. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetic stirring method for preparing positive electrode slurry for coin cells, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for preparing a coin cell positive electrode slurry by magnetic stirring includes the following steps: (1) Weigh the target powder and additives; (2) Take a glass bottle, open the cap and put a stirring magnet into the glass bottle, then add the target powder and additives weighed in step (1) into the glass bottle in sequence, and then tighten the cap; (3) Place the glass bottle with the cap tightened on the glass bottle placement area of ​​the magnetic stirring base, and start the magnetic stirrer to stir the material in the glass bottle; (4) After stirring, remove the glass bottle and open the cap to take out the button battery positive electrode slurry inside the glass bottle.

[0006] As a further aspect of the present invention: the additives in step (1) include conductive agents, binders and NMP.

[0007] As a further aspect of the present invention: the conductive agent includes conductive agent-1 and conductive agent-2.

[0008] As a further aspect of the present invention: in step (3), the stirring time of the magnetic stirrer is 4 hours.

[0009] As a further aspect of the present invention: in step (3), multiple glass bottles containing materials and with their caps tightened are placed on the glass bottle placement area of ​​the magnetic stirring base, and the materials in the multiple glass bottles are stirred simultaneously by the magnetic stirrer.

[0010] As a further aspect of the present invention: in step (2), after tightening the cap, the cap forms a sealed fit with the glass bottle to prevent material leakage or external impurities from entering the glass bottle during the stirring process.

[0011] As a further aspect of the present invention: in step (3), the size of the glass bottle placement area is adapted to the bottom size of the glass bottle to achieve stable placement of the glass bottle on the magnetic stirring base.

[0012] As a further aspect of the present invention: in step (1), the target powder weighed is 1.4 g, conductive agent-1 is 0.88 g, conductive agent-2 is 0.88 g, binder is 3.5 g, and NMP is 1.6 g.

[0013] Compared with the prior art, the beneficial effects of the present invention are: In the slurry preparation process of the present invention, a glass bottle containing materials and a magnetic ball is placed in the glass bottle placement area of ​​a magnetic stirring base, and a magnetic stirrer is run to stir the materials. Multiple materials can be stirred at the same time. This allows for the simultaneous slurry preparation of multiple materials, which greatly improves the slurry preparation efficiency. The pulp preparation process of this invention adopts the following operation method: weighing the materials, weighing the additives, opening the cap and placing the magnetic stirrer, then sequentially adding the target materials, tightening the cap and placing the glass bottle in the glass bottle placement area, and running the magnetic stirrer to stir. This replaces the traditional manual pulp preparation. It makes up for the defects of instability caused by manual pulp preparation, and is simple and easy to learn, reducing the skill and technique requirements for operators. The slurry preparation process of this invention uses a magnetic stirrer to drive magnetic particles inside a glass bottle to stir the materials, rather than relying on manual stirring. This technical solution saves manpower and can better promote the fusion between materials, effectively improving the slurry preparation effect and providing a more stable slurry foundation for subsequent performance testing of lithium battery cathode materials. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the glass bottle, cap, and stirring magnet used for preparing the positive electrode slurry of a button cell in an embodiment of the present invention.

[0015] Figure 2This is a schematic diagram of the magnetic stirring base and glass bottle placement area for preparing the positive electrode slurry of a button cell in an embodiment of the present invention.

[0016] In the diagram: 1-lid, 2-glass bottle, 3-magnetic stirring rod, 4-glass bottle placement area, 5-magnetic stirring base. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0019] Please see Figure 1 and Figure 2 This invention provides a magnetic stirring method for preparing a coin cell positive electrode slurry. In preparing the coin cell positive electrode slurry, the first step is to weigh the materials: using conventional weighing tools (such as an electronic balance), 1.4 grams of the target powder, 0.88 grams of conductive agent-1, 0.88 grams of conductive agent-2, 3.5 grams of binder, and 1.6 grams of NMP are weighed. Precise weighing lays the foundation for the subsequent preparation of a uniform slurry and avoids affecting the slurry performance due to deviations in material ratios.

[0020] Next, prepare the materials for bottling and mixing: Take a custom glass bottle 2, open its cap 1, and put the stirring magnet 3 into the glass bottle 2. The cap 1 can be movably closed onto the opening of the glass bottle 2, forming a seal inside the glass bottle 2 after closing, preventing material leakage or the entry of external impurities during the mixing process. The stirring magnet 3 is a component that can be freely placed inside the glass bottle 2. During mixing, it can rotate synchronously with the magnetic field of the magnetic stirrer under the action of magnetic force. Then, add the weighed target powder, conductive agent-1, conductive agent-2, binder and NMP into the custom glass bottle 2 in sequence. After the materials are added, tighten the cap 1 of the glass bottle 2. This can prevent material leakage or the entry of external impurities during the mixing process, and ensure the cleanliness of the slurry preparation environment.

[0021] Next, magnetic stirring is performed: the glass bottle placement area 4 is a positioning structure (such as a groove or marking area) pre-installed on the top of the magnetic stirring base 5. Its size is adapted to the bottom of the glass bottle 2, so that the glass bottle 2 is stably placed on the magnetic stirring base 5, ensuring that the magnetic field generated by the magnetic stirring base 5 can effectively act on the stirring magnet 3 inside the glass bottle 2. The customized glass bottles 2 with the caps 1 tightened are placed one by one on the glass bottle placement area 4 of the magnetic stirring base 5. The power switch of the magnetic stirrer is turned on, and the stirring parameters are set (in this embodiment, the stirring time is 4 hours, and the stirring speed can be a conventional speed suitable in the field). The magnetic stirrer drives the stirring magnet 3 inside the glass bottle 2 to rotate at high speed through the magnetic field, thereby achieving thorough stirring of the material. During this process, multiple customized glass bottles 2 containing materials can be stirred at the same time. Compared with the traditional manual pulping method, which can only process one batch of material at a time, it can significantly improve the pulping efficiency and solve the problem of low efficiency in manual pulping.

[0022] Finally, the slurry is obtained and processed: After the stirring time is over, the magnetic stirrer is turned off, the custom glass bottle 2 is removed and the cap 1 is opened, and the prepared button cell positive electrode slurry is taken out. It can then be used for subsequent coating operations to test the performance of the lithium battery positive electrode material.

[0023] The stirring of the magnetic stirrer 3 replaces the traditional manual stirring, which not only saves manpower but also ensures that the materials are evenly mixed in the glass bottle 2, better promoting material fusion and improving the slurry preparation effect. At the same time, the operation process is fixed and does not rely on the operator's skill, making up for the instability caused by manual slurry preparation. It is also simple and easy to learn, making it easy for those skilled in the art to quickly master and implement, effectively reducing the skill requirements for operators.

[0024] It should be noted that, in this invention, unless otherwise explicitly specified and limited, the terms "sliding," "rotating," "fixed," and "equipped" should be interpreted broadly. For example, they can refer to welded connections, bolted connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a button cell positive electrode slurry using magnetic stirring, characterized in that, Includes the following steps: (1) Weigh the target powder and additives; (2) Take a glass bottle, open the cap and put a stirring magnet into the glass bottle, then add the target powder and additives weighed in step (1) into the glass bottle in sequence, and then tighten the cap; (3) Place the glass bottle with the cap tightened on the glass bottle placement area of ​​the magnetic stirring base, and start the magnetic stirrer to stir the material in the glass bottle; (4) After stirring, remove the glass bottle and open the cap to take out the button battery positive electrode slurry inside the glass bottle.

2. The method for preparing button cell positive electrode slurry by magnetic stirring according to claim 1, characterized in that, The additives in step (1) include conductive agents, binders and NMP.

3. The method for preparing button cell positive electrode slurry by magnetic stirring according to claim 2, characterized in that, The conductive agent includes conductive agent-1 and conductive agent-2.

4. The method for preparing button cell positive electrode slurry by magnetic stirring according to claim 1, characterized in that, In step (3), the stirring time of the magnetic stirrer is 4 hours.

5. The method for preparing button cell positive electrode slurry by magnetic stirring according to claim 1, characterized in that, In step (3), multiple glass bottles containing materials and with their caps tightened are placed on the glass bottle placement area of ​​the magnetic stirring base, and the materials in the multiple glass bottles are stirred simultaneously by the magnetic stirrer.

6. The method for preparing button cell positive electrode slurry by magnetic stirring according to claim 1, characterized in that, In step (2), after tightening the cap, the cap forms a sealed fit with the glass bottle to prevent material leakage or external impurities from entering the glass bottle during the stirring process.

7. The method for preparing button cell positive electrode slurry by magnetic stirring according to claim 1, characterized in that, In step (3), the size of the glass bottle placement area is adapted to the bottom size of the glass bottle to achieve stable placement of the glass bottle on the magnetic stirring base.

8. The method for preparing coin cell positive electrode slurry by magnetic stirring according to claim 1, characterized in that, In step (1), the target powder weighed is 1.4 g, conductive agent-1 is 0.88 g, conductive agent-2 is 0.88 g, binder is 3.5 g, and NMP is 1.6 g.

Images