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The function of lithium-ion battery separator paper in lithium-ion batteries is to isolate the positive and negative electrode materials. The quality of separator paper directly affects the safety performance and capacity of batteries.

The traditional polymer separator is made of polyethylene and polypropylene as raw materials, and microporous polyolefin lithium-ion battery separator materials are prepared through processes such as melt extrusion, stretching, and heat setting. This material has high porosity and tear resistance, good acid and alkali resistance, and elasticity. After several hundred cycles of use, its physical and chemical properties have not significantly changed.

The separator material of lithium-ion batteries is mainly used for isolation between the positive and negative electrodes of lithium-ion batteries, and plays a role in preventing overheating and self closing protection from explosions caused by battery short circuits during overcharging. It is a key material for lithium-ion batteries. The main physical and chemical indicators of the separator material of lithium-ion batteries include:

Aperture size: The diaphragm has a certain aperture size, which can control the transmission speed of ions between the positive and negative electrodes.

Pore size distribution: The size and uniformity of pore size distribution in the separator also have a significant impact on battery performance.

Conductivity: The separator should have good conductivity to ensure balanced distribution of internal charges in the battery.

Mechanical strength: The diaphragm should have sufficient mechanical strength to prevent internal short circuits or pinholes in the battery.

Chemical stability: the diaphragm shall have sufficient chemical stability to ensure that the battery will not decompose and dissolve during long time operation.

Common types of separator materials for lithium-ion batteries include polypropylene (PP), polyimide (PI), polyimide (PBI), etc. Among them, polypropylene is the most commonly used separator material for lithium-ion batteries, which is widely used because of its low price and good chemical stability.

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