Lithium electronic battery separator air permeability parameters

Lithium electronic battery separator is one of the four main materials of lithium batteries, accounting for 5% to 10% of the material cost. The total global demand for separators in 2019 was approximately 3.55 billion square meters, of which power battery demand accounted for 53% .

Generally speaking, lithium-ion battery separators will have an air permeability parameter, or Gurley number.

This number is defined as the time required for a certain volume of gas to pass through a certain area of diaphragm under certain pressure conditions. The volume of gas is generally 50cc, and some companies will also mark it as 100cc. The final result will be Twice the difference.

Lithium electronic battery separators are mainly made by mechanical stretching of ptfe materials.

PTFE is a highly crystalline polymer polymerized with tetrafluoroethylene as a monomer.

It is a white waxy thermoplastic similar to polyethylene (PE).

It has excellent high temperature resistance and low temperature resistance. The melting point is 327 degrees Celsius and the decomposition temperature is 415 degrees Celsius. It can be used for a long time in the range of 200 to 260 degrees Celsius.

At the same time, the material is highly hydrophobic, has non-adhesiveness, corrosion resistance, thermal stability and good mechanical properties, so it can be washed with water to restore its performance and be reused, greatly extending its service life and saving costs.

It is a fluorine material film manufacturer integrating production, sales and customization.

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