How to solve the defects in lithium battery coating?

There will be some defects in the production process of lithium battery coating.

1.Porosity: First, bubble generation (stirring process, transportation process, coating process); Pinhole defects caused by air bubbles are easy to understand, and the mold temperature machine helps the coater to control the temperature and keep warm. Improve coating quality and yield, resin equipment.

2.The waste generated in the coating process is mainly the initial adjustment of the machine (related to the operation level of the technician), the coating interruption foil, mixed with foreign matter, etc., the mold temperature machine helps the coating machine to control the temperature and keep warm, each shutdown will produce a certain distance of waste, and reducing the cost is an important content that needs to be studied in the coating process.

3.This is found to be an agglomerate of a conductive agent. This defect is mainly eliminated by improving the slurry mixing process.

4.Formation of punctate defects in shrinkage holes. The main preventive measures are: coating liquid filtration and iron removal, environmental dust control, and substrate surface cleaning.

5.Agglomerate particle bulge: If the slurry is not stirred evenly, the liquid film will migrate towards the surrounding particles, and the film surface will rupture to form pinhole defects. Mold temperature machine. The bubbles mainly come from agitation, coating transport, and the coating process.

In the process of lithium battery coating, these conditions need to be met at the same time: stable foiling, uniform and stable flow state formed inside the die, stable slurry feeding, and stable temperature control of the mold temperature machine.

Hello, coating is the second part of lithium battery production, the specific process is mixing-coating-rolling-slitting, the purpose is to coat the positive and negative electrode slurry on the surface of the current collector (copper foil, aluminum foil), and make the plate for subsequent processing.

Summary. Hello, happy to answer for you. Lithium battery coating is an indispensable part of the lithium battery manufacturing process.

Common lithium battery coating quality problems and solutions are as follows:1The interface is uneven.

This may be due to the uneven distribution of the electrolyte, resulting in an uneven contact surface between the material and the copper foil. The solution is to optimize the concentration and composition of the electrolyte, increase the speed and pressure of the coating, and ensure that the electrolyte is evenly distributed. 2.

Poor adhesion. This is usually due to the presence of undesirable substances such as oxides on the surface of the electrode material when it comes into contact with the electrolyte, or the accumulation of dirt on the coating lines or insulators. The solution is to regularly check the cleanliness of the equipment and materials, while keeping the surface of the coated material dry and reducing its contact with other surfaces to reduce adhesion problems.

3.The electrodes are too thin or too thick. Electrodes that are too thin may result in greater voltage drop, reduced capacity, and cycling stability, while electrodes that are too thick may result in increased internal resistance of the battery, reducing its discharge efficiency.

Hello. Hello, I'm glad to answer for you. Lithium battery coating is an indispensable part of the lithium battery manufacturing process.

Common lithium battery coating quality problems and solutions are as follows:1The interface is uneven.

This may be due to the uneven distribution of the electrolyte, resulting in an uneven contact surface between the material and the copper foil. The solution is to optimize the concentration and composition of the electrolyte, increase the speed and pressure of the coating, and ensure that the electrolyte is evenly distributed. 2.

Poor adhesion. This is usually due to the presence of undesirable substances such as oxides on the surface of the electrode material in contact with the electrolyte, or the accumulation of dirt on the pure nanocloth wiring or insulator. The solution is to regularly check the cleanliness of the equipment and materials, while keeping the surface of the coated material dry and reducing its contact with other surfaces to reduce adhesion problems.

3.The electrodes are too thin or too thick. Electrodes that are too thin may result in greater voltage drop, loss of capacity, and cycling stability, while electrodes that are too thick may result in increased internal resistance of the battery, reducing its discharge efficiency.

I would like to ask what kind of anomaly is applied to the positive and negative electrodes.

Hello, the coating quality of the positive and negative electrodes of lithium batteries has a great impact on the performance of the battery, which is mainly reflected in the energy density, cycle life, safety and other aspects of the battery. The following is the performance of abnormal coating quality of positive and negative arguments:1

Cathode coating:- Defective coatings such as inconsistent thickness are widespread. - The electrode voltage drop is too large, the discharge capacity of the battery decreases, and the energy density is low.

It is prone to potential safety hazards such as thermal runaway and combustion. 2.Negative Electrode Coating:

Defective coatings such as inconsistent thickness are widespread. - The internal resistance is too large, resulting in low battery discharge efficiency. - Polarization may occur, resulting in a shorter battery cycle life.

Therefore, the positive and negative electrode coating should be strictly controlled within the appropriate range, and the common positive electrode coating yield can reach more than 95%, while the negative electrode coating yield can be as high as 98%. At present, the technology of lithium battery automatic coating equipment with bucket blade has been continuously improved, the uniformity and consistency of coating thickness have been greatly improved, and the abnormal coating quality has been greatly reduced.

Hello, it's a pleasure to serve you. Lithium battery coating is one of the key steps in the lithium battery manufacturing process, and the coating quality directly affects the performance and life of the battery. The following are common lithium battery coating quality problems and solutions:

1.Uneven or cracks in the battery coating: This may be due to insufficient uniformity of the coating during the coating process, or the viscosity of the coating material is too high.

The solution is to adjust the coating speed and boost pressure of the coater, and check whether the viscosity of the coating material meets the requirements. 2.Insufficient coating viscosity or poor coagulation:

This may be due to too many solid particles in the coating fluid, or the temperature is too low during the coating process. The solution is to adjust the ratio of the coating solution or increase the heat source to increase the temperature during the coating process. 3.

Bubbles or foreign objects on the surface of the coating: This may be due to impurities in the coating solution during the coating process or excessive vibrations during the coating process. The solution is to increase the filtration of the coating solution or to adjust the vibration amplitude of the coater.

4.Weak coating or easy peeling: This may be due to insufficient adhesive added to the coating solution, or poor contact between the coating and the electrode plate during the application process.

The solution is to appropriately increase the proportion of binders in the coating solution and strengthen the contact force during the coating process. Jinzhou.