How to realize gradient composite coating technology?

By designing the gradient distribution of active components and inactive buffer components of the negative electrode platform, the electrode gradient composite coating technology can really greatly improve the bonding force between the active layer and the current collector, thus improving the structural stability of the negative electrode platform. However, when multi-layer coating, the increase of the number of layers may lead to the problem of drying and cracking of the pole piece. To solve this problem, we should pay attention to the following points:

1. Optimization of coating solution formula: It is more suitable for multi-layer coating by adjusting the proportion and properties of each component in the coating solution. For example, the content of the adhesive can be increased, or an adhesive with better wettability and adhesiveness can be used to enhance the bonding force between layers.

2. Control of coating process parameters: During the coating process, parameters such as coating speed, coating thickness and drying temperature should be accurately controlled. Too fast or too slow coating speed, too thick or too thin coating, too high or too low drying temperature may all lead to cracking of the pole piece. So these parameters need to be optimized according to the actual situation.

3. Interlayer treatment: In multilayer coating, some special interlayer treatment technologies, such as interlayer baking and interlayer cooling, can be used to eliminate the internal stress between layers and improve the bonding strength between layers.

4. Equipment maintenance: It is very important to keep the painting equipment in good condition to prevent the pole piece from cracking. Equipment should be maintained regularly to ensure the normal operation of all components and reduce coating quality problems caused by equipment failure.

5. Environmental control: Keeping the production environment stable is also an important measure to prevent the pole piece from cracking. Environmental factors such as temperature, humidity and cleanliness in the production workshop should be controlled to reduce the influence of external environment on the painting process.

By paying attention to the above points, the problem of drying and cracking of pole pieces during multilayer coating can be effectively reduced, and the stability and reliability of electrode gradient composite coating technology can be improved.