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What are the lithium battery separator materials and separator material products?

What are the lithium battery separator materials and separator material products?

According to different physical and chemical properties, lithium battery separator materials can be divided into: woven film, non-woven film (non-woven fabric), microporous film, composite film, separator paper, rolled film and so on.

At present, the market-oriented diaphragm materials are mainly polyolefin (Polyolefin) diaphragms based on polyethylene (PE) and polypropylene (PP). Among them, PE products are mainly produced by wet process, and PP products are mainly Made by dry process. Below are the properties of the two materials, PE and PP, in general:

(1) PP is relatively more resistant to high temperature, and PE is relatively resistant to low temperature;

(2) The density of PP is smaller than that of PE;

(3) PP has higher melting point and closed cell temperature than PE;

(4) PP products are more brittle than PE;

(5) PE is more sensitive to environmental stress.

The main diaphragm material products are single-layer PP, single-layer PE, PP+ceramic coating, PE+ceramic coating, double-layer PP/PE, double-layer PP/PP and three-layer PP/PE/PP, among which the first two types of products are It is mainly used in the field of 3C small batteries, and the latter types of products are mainly used in the field of power lithium batteries.

Among the diaphragm materials for power lithium batteries, the double-layer PP/PP diaphragm materials are mainly produced by Chinese enterprises and used in mainland China, mainly because there is no Chinese enterprise that can make PP and PE into a double-layer composite film. ability. The separators used in global automotive power lithium batteries are mainly three-layer PP/PE/PP, double-layer PP/PE, and PP+ceramic coating, PE+ceramic coating and other separator materials.

In the structure of lithium batteries, the separator is one of the key inner layer components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. The separator with excellent performance plays an important role in improving the overall performance of the battery.

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