The uneven coating of lithium iron phosphate batteries not only leads to poor battery consistency, but also relates to issues such as design and use safety. Therefore, the control of coating uniformity in the production process of lithium iron phosphate battery is very strict, and the following items can be tried:

1. Use "linear" conductive agent

"Linear" conductive agents are used, mainly VGCF (carbon fiber) and CNTs (carbon nanotube), metal nanowires, etc. at present.They have a diameter of several nanometers to tens of nanometers, and a length of more than tens of micrometers or even a few centimeters, while the size of the commonly used "particle-shaped" conductive agents (such as Super-P, KS-6) is generally in the tens of nanometers.The size of the battery material is a few microns.

In the pole piece composed of "particle-shaped" conductive agent and active material, the contact is similar to the point-to-point contact, and each point can only contact the surrounding points; in the pole piece composed of "linear" conductive agent and active material,

It is the contact between point and line, line and line. Each point can contact with multiple lines at the same time, and each line can also contact with multiple lines at the same time. There are more nodes in contact, and the conduction channel is more smooth，Better conductivity.

Using a variety of different forms of conductive agent combination can play a better conductive effect.

2. Improve the dispersion effect

If the dispersion effect is good, the probability of particle contact agglomeration will be greatly reduced, and the stability of the slurry will be greatly improved.

The dispersion effect can be improved to a certain extent through the improvement of the formula and batching steps, and the ultrasonic dispersion mentioned above is also an effective method.

3. Improve the slurry transfer process

When storing the slurry, consider increasing the stirring speed to avoid the slurry being sticky; for those using a turnover bucket to transfer the slurry, shorten the time from discharging to coating as much as possible, and switch to pipeline transportation if possible to improve the slurry viscosity.

4. Using extrusion coating (spraying)

Extrusion coating can improve the surface texture and uneven thickness of blade coating.