Method for shortening homogenization time of positive electrode and negative electrode of metal ion battery

Abstract

The invention discloses a method for shortening homogenization time of a positive electrode and a negative electrode of a metal ion battery. The method comprises the following steps: S1, preparing a glue solution; s2, homogenizing; s3, homogenizing at a high speed; s4, dispersing the raw materials; s5, transferring the slurry for later use, in the step S1, adding a binder and a solvent into stirring and dispersing equipment, stirring and dispersing for later use, in the step S2, adding positive and negative electrode materials, a conductive agent and a glue solution into the stirring and dispersing equipment, stirring at a high speed for 30-240 minutes, and in the step S3, adding the positive and negative electrode materials, the conductive agent and the glue solution into the stirring and dispersing equipment, stirring at a high speed for 30-240 minutes, and stirring at a high speed for 30-240 minutes. The high-speed homogenization time of the positive and negative electrode slurry is shortened, the slurry is prepared through the ball mill, the working efficiency is improved, the state of the slurry is improved, the battery performance is improved, and the method is not only suitable for positive and negative electrode materials of lithium ion batteries, but also suitable for positive and negative electrode materials of sodium ion batteries and positive and negative electrode materials of other metal ion batteries.

Description

Technical Field

[0001] The invention relates to the technical field of battery positive and negative electrode homogenization methods, and in particular to a method for shortening the homogenization time of positive and negative electrodes of a metal ion battery. Background Art

[0002] In recent years, the new energy industry has developed rapidly. Thanks to the rapid development of new energy vehicles and energy storage, the field of metal ion batteries has grown rapidly. Metal ion batteries have high energy density, safety performance, good rate performance, high cycle life, and environmental friendliness, which have attracted widespread attention. The positive electrode of metal ion batteries includes materials such as lithium, sodium, potassium, and aluminum, and the negative electrode materials include graphite, hard carbon, soft carbon, etc.

[0003] During the manufacturing process of metal ion batteries, the positive and negative electrode slurries need to be stirred at high speed for a long time to ensure that the slurry is evenly dispersed. Uneven slurry dispersion will lead to poor battery consistency, poor electrical performance, safety performance, and cycle performance of the later batteries. Due to the large pH value of the layered positive electrode material, during the long homogenization process, the positive electrode slurry is very easy to absorb water, resulting in poor slurry fluidity and even slurry jelly; the polyanion positive electrode material has a large specific surface area, and only long-term high-speed stirring and dispersion can achieve the uniformity of the slurry; during the long-term high-speed dispersion process of the negative electrode material, the secondary particles will be broken up to a certain extent, and the material structure itself will be destroyed; and the long-term high-speed stirring and dispersion of the positive and negative electrodes reduces the work efficiency and increases the energy consumption. Therefore, the present invention proposes a method for shortening the homogenization time of the positive and negative electrodes of metal ion batteries to solve the above problems. Summary of the invention

[0004] Based on the background technology, due to the large pH value of the layered positive electrode material, the positive electrode slurry is very easy to absorb water during the long-term homogenization process, resulting in poor slurry fluidity and even the appearance of slurry jelly; the polyanion positive electrode material has a large specific surface area, and the slurry can only be made uniform by long-term high-speed stirring and dispersion; the secondary particles of the negative electrode material will be broken up to a certain extent during the long-term high-speed dispersion process, and the material structure itself will be destroyed; and the long-term high-speed stirring and dispersion of the positive and negative electrodes reduces the work efficiency and increases the energy consumption. The present invention proposes a method for shortening the homogenization time of the positive and negative electrodes of metal ion batteries.

[0005] The present invention provides a method for shortening the homogenization time of positive and negative electrodes of a metal ion battery, comprising the following steps: S1: glue preparation; S2: homogenate; S3: high speed homogenization; S4: raw material dispersion; S5: Transfer the slurry for later use.

[0006] Preferably, in the step S1, the binder and the solvent are added into a stirring and dispersing device, stirred and dispersed, and then set aside.

[0007] Preferably, in the step S2, the positive and negative electrode materials, the conductive agent and the glue are added into a stirring and dispersing device and stirred at high speed for 30-240 minutes.

[0008] Preferably, in the step S3, the positive and negative electrode materials, the conductive agent and the glue are added into a stirring and dispersing device, and the high-speed stirring and dispersing time is 10-120 minutes.

[0009] Preferably, in the step S4, the slurry is added into a ball mill, the main machine speed is 100-1000 r / min, and the discharge speed is 1-5 L / min.

[0010] Beneficial effects of the present invention: 1. This method is used to shorten the homogenization time of the positive and negative electrode slurries of the battery, and prevent the layered positive electrode material from absorbing water during the long homogenization process, causing the slurry to jelly; 2. This method is used to prepare the slurry of polyanion positive and negative electrode materials, which can significantly improve the state of the polyanion positive electrode slurry while saving the homogenization time; 3. This method is used to shorten the homogenization time of the battery negative electrode and prevent the damage to the secondary particles of the negative electrode material during the high-speed dispersion process; 4. This method can shorten the homogenization time of the positive and negative electrode slurries of metal batteries and make the positive and negative electrode slurries more evenly dispersed, providing a better foundation for later battery production, improving work efficiency and saving energy consumption; 5. The present invention shortens the high-speed homogenization time of positive and negative electrode slurries, completes slurry preparation through a ball mill, improves work efficiency, improves slurry state, and enhances battery performance. It is not only suitable for positive and negative electrode materials of lithium-ion batteries, but also for positive and negative electrode materials of sodium-ion batteries, and positive and negative electrode materials of other metal-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The working flow chart proposed by the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further explained below in conjunction with specific embodiments.

[0013] Reference Figure 1 , Embodiment 1 This embodiment proposes a method for shortening the homogenization time of the positive and negative electrodes of a metal ion battery, comprising the following steps: S1: Preparation of glue solution: adding binder and solvent into stirring and dispersing equipment, stirring and dispersing, and then setting aside; S2: Homogenize, add positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, stir at high speed for 30 minutes; S3: High-speed homogenization, adding positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, high-speed stirring and dispersing time 30 minutes; S4: Raw materials are dispersed, and the slurry is added into the ball mill. The main machine speed is 1000r / min, the discharge speed is 1.5L / min, the slurry solid content is 61.3%, the viscosity is 3100cp / 27℃, and the slurry state is normal; S5: Transfer the slurry for later use.

[0014] Reference Figure 1 , Embodiment 2 This embodiment proposes a method for shortening the homogenization time of the positive and negative electrodes of a metal ion battery, comprising the following steps: S1: Preparation of glue solution: adding binder and solvent into stirring and dispersing equipment, stirring and dispersing, and then setting aside; S2: Homogenize, add positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, stir at high speed for 50 minutes; S3: High-speed homogenization, adding positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, high-speed stirring and dispersing time 50min; S4: Raw materials are dispersed, and the slurry is added into the ball mill. The main machine speed is 800r / min, the discharge speed is 1.5L / min, the slurry solid content is 61.3%, the viscosity is 2500cp / 27℃, and the slurry state is normal; S5: Transfer the slurry for later use.

[0015] Reference Figure 1 , Embodiment 3 This embodiment proposes a method for shortening the homogenization time of the positive and negative electrodes of a metal ion battery, comprising the following steps: S1: Preparation of glue solution: adding binder and solvent into stirring and dispersing equipment, stirring and dispersing, and then setting aside; S2: Homogenize, add positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, stir at high speed for 80 minutes; S3: High-speed homogenization, adding positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, high-speed stirring and dispersing time 80min; S4: Raw materials are dispersed, and the slurry is added into the ball mill. The main machine speed is 400r / min, the discharge speed is 1.5L / min, the slurry solid content is 61.3%, the viscosity is 3200cp / 27℃, and the slurry state is normal; S5: Transfer the slurry for later use.

[0016] Reference Figure 1 , Embodiment 4 This embodiment proposes a method for shortening the homogenization time of the positive and negative electrodes of a metal ion battery, comprising the following steps: S1: Preparation of glue solution: adding binder and solvent into stirring and dispersing equipment, stirring and dispersing, and then setting aside; S2: Homogenization: add positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, and stir at high speed for 100 minutes; S3: High-speed homogenization, adding positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, high-speed stirring and dispersing time 100 minutes; S4: Raw materials are dispersed, and the slurry is added into the ball mill. The main machine speed is 200r / min, the discharge speed is 1.5L / min, the slurry solid content is 61.3%, the viscosity is 3700cp / 27℃, and the slurry state is normal; S5: Transfer the slurry for later use.

[0017] Reference Figure 1 , the comparison example is as follows: A method for shortening the homogenization time of positive and negative electrodes of a metal ion battery in this comparative example comprises the following steps: S1: Preparation of glue solution: adding binder and solvent into stirring and dispersing equipment, stirring and dispersing, and then setting aside; S2: Homogenize, add positive and negative electrode materials, conductive agent and glue into the stirring and dispersing equipment, stir at high speed for 150 minutes; S3: High-speed homogenization, adding positive and negative electrode materials, conductive agent, and glue into the stirring and dispersing equipment, high-speed stirring and dispersing time 150min; slurry solid content 61.3%, viscosity 4300cp / 27℃, slurry state jelly; S5: Transfer the slurry for later use.

[0018] The battery positive and negative electrode slurries prepared in Examples 1 to 4 and the conventional battery positive and negative electrode slurries in the comparative example are compared in the following table: Example one two three Four Comparative Example Slurry fineness (μm) 20 17 25 32 35 Slurry viscosity (cp / 27℃) 3100 2500 3200 3700 4300 Cycle number 2020 2305 1850 1561 1433 Compared with the comparative example, the best solution in the above embodiments is embodiment 2, which has a main engine speed of 800r / min, a discharging speed of 1.5L / min, high discharging efficiency, and can save time. At the same time, its slurry fineness is minimal, viscosity is best, and circulation performance is best.

[0019] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for shortening the homogenization time of positive and negative electrodes of a metal ion battery, characterized in that: The following steps are involved: S1: glue preparation; S2: homogenate; S3: high speed homogenization; S4: raw material dispersion; S5: Transfer the slurry for later use.

2. A method for shortening the homogenization time of positive and negative electrodes of a metal ion battery according to claim 1, characterized in that: In the step S1, a binder and a solvent are added into a stirring and dispersing device, and the mixture is stirred and dispersed for later use.

3. A method for shortening the homogenization time of positive and negative electrodes of a metal ion battery according to claim 1, characterized in that: In the step S2, the positive and negative electrode materials, the conductive agent and the glue are added into a stirring and dispersing device and stirred at a high speed for 30-240 minutes.

4. A method for shortening the homogenization time of positive and negative electrodes of a metal ion battery according to claim 1, characterized in that: In the step S3, the positive and negative electrode materials, the conductive agent and the glue are added into a stirring and dispersing device, and the high-speed stirring and dispersing time is 10-120 minutes.

5. A method for shortening the homogenization time of positive and negative electrodes of a metal ion battery according to claim 1, characterized in that: In the step S4, the slurry is added into the ball mill, the main machine speed is 100-1000r / min, and the discharge speed is 1-5L / min.

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