LR03 battery.Technical content of battery separator paper

　　Lithium batteries have become a hot topic in research on new power supply technologies in recent years due to their high energy density, long cycle life, light weight, small size, and other advantages. They are also safe, reliable, and capable of rapid charge and discharge. They are widely used in high-energy and high-power fields. popular. In the structure of lithium batteries, the separator is one of the key inner components. The separator is made of plastic film, which can isolate the positive and negative electrodes of the battery to prevent short circuits. It can also block the current conduction in the battery through the closed hole function when the battery overheats.

　　According to different physical and chemical properties, lithium-ion battery separator materials can be divided into: woven membranes, non-woven membranes (non-woven fabrics), microporous membranes, composite membranes, separator paper, rolled membranes, etc. Polyolefin materials have excellent mechanical properties, chemical stability and relatively cheap characteristics. Therefore, polyolefin microporous membranes such as polyethylene and polypropylene were used as lithium-ion battery separators in the early stages of lithium-ion battery research and development.

　　Today, commercial lithium-ion battery separators are still polyolefin microporous membranes. In recent years, solid and gel electrolytes have begun to be used as a special component that simultaneously plays the role of electrolyte and battery separator. It is an emerging technological means. The cost of lithium battery separator accounts for about 1/3 of the battery cost. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, which directly affects the battery's capacity, cycle performance, safety performance and other characteristics. Excellent separators play an important role in improving the overall performance of the battery. At present, 60% to 70% of the separator market mainly uses the wet biaxial stretching process, because the wet biaxial stretching is more uniform and balanced in the longitudinal and transverse directions. Moreover, the wet method is mainly used for high-end separators, and the dry method is used for mid- to low-end products.

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