The market-oriented membrane materials are mainly polyolefin membranes made of polyethylene (PE) and polypropylene (PP). PE products are mainly produced by wet process, while PP products are mainly produced by dry process. As for the characteristics of PE and PP materials.

　　Overall:

　　① PP is relatively more resistant to high temperatures, while PE is relatively resistant to low temperatures;

　　② PP has a lower density than PE;

　　③ PP has a 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 include 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 mainly used in the field of 3C small batteries, and the latter few types are mainly used in the field of power lithium batteries. Among the diaphragm materials used for power lithium batteries, double-layer PP/PP diaphragm materials are mainly produced by Chinese enterprises and used in Chinese Mainland, mainly because there is no technology and ability of Chinese enterprises to make double-layer composite films from PP and PE. The separators used in global automotive lithium-ion batteries are mainly made of three-layer PP/PE/PP, double-layer PP/PE, as well as PP+ceramic coating, PE+ceramic coating and other separator materials.

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