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Difference between dry method and wet method of lithium-ion battery separator

Comparison between wet diaphragm and dry diaphragm of lithium ion battery. Diaphragm is the core of lithium ion battery preparation. Lithium ion battery diaphragm is generally divided into dry process and wet process according to the process. Therefore, diaphragm products are also divided into dry process diaphragm and wet process diaphragm. Many characteristics of lithium-ion battery separators put forward special requirements for their production process, which includes raw material formula and rapid formula adjustment, microporous preparation technology, independent design of complete equipment and other processes.

A. Due to the simple process, the investment of fixed assets in dry method is smaller than that in wet method; However, it is difficult to control the temperature and other indicators of the dry process, and the wet process is simpler;

B. The dry method can make three-layer membrane, and the wet method can only make single-layer membrane; (The advantage of the three-layer film is that the thermal closing temperature is 135 degrees, but the thermal stability temperature is 160 degrees, which can prevent thermal inertia. There is a space of 25 degrees, which is safer)

C. In addition to the different processing technology, the dry process and wet process use different raw materials. The raw materials used in the dry process are of good fluidity and low molecular weight, so the high temperature can only reach 135 degrees, and will shrink when exposed to heat. The safety is not suitable for making high-power and high-capacity batteries; The wet process uses non-flowing and high molecular weight raw materials, and the thermal shutdown temperature can reach 180 degrees, which can ensure the safety of high-power lithium-ion batteries;

D. In the production of general lithium-ion batteries, the dry method has the advantages of low cost, small pollution and more uniform pores; The wet method has advantages in high-power batteries, especially in terms of safety and thermal shrinkage.

Advantages of wet separator and dry separator for lithium ion battery

The wet diaphragm of lithium-ion battery is light, thin and hard to tear, but the PE melting point is 135 ℃, and the safety is lower than that of the dry diaphragm. In addition, the raw materials and production processes are different, and the comprehensive cost is higher than that of the dry diaphragm; The dry diaphragm has high melting point, better heat resistance, high pressure resistance and oxidation resistance, but the wet diaphragm is relatively thick and easy to tear longitudinally, which has high requirements for the battery company's process.

The diaphragm is the highest technical barrier in lithium-ion battery materials, and its performance is crucial to the lightweight and safety of lithium-ion battery. Compared with dry diaphragm, wet diaphragm has certain advantages in mechanical properties, permeability and physical and chemical properties. After coating, the thermal stability of wet diaphragm can be greatly improved. Generally speaking, wet coated diaphragm has obvious performance advantages. Most high-end consumer batteries use wet separators. With the improvement of the energy density requirements of power lithium batteries, especially the wide application of ternary batteries, the penetration of wet separators in power lithium batteries will also gradually increase.

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