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③ Wettability

To ensure that the internal resistance of the battery is not too high, it is required that the separator can be completely soaked by the electrolyte used in the battery, which is related to the separator material itself and the surface and internal microstructure of the separator.

Rough judgment: Take a typical electrolyte (such as EC: DMC=1:1, 1MLIPF) and drop it on the surface of the membrane to see if the droplets will quickly disappear and be absorbed by the membrane.

Accurate judgment: Use a camera with ultra-high time discrimination to record the process from droplet contact with the membrane to droplet disappearance, calculate the time, and compare the infiltration degree of the two types of membranes through the length of time.

④ Chemical stability of 18650 lithium-ion battery separator

The membrane is required to be inert in electrochemical reactions, and not reactive to strong reduction and oxidation, with no attenuation of mechanical strength, and no impurities present. It is generally believed that the current materials used for membranes, such as PE or PP, can meet the requirements for chemical inertness.

⑤ Aperture of 18650 lithium-ion battery separator

Guard against electrode particles passing straight through the diaphragm, with a required pore size of 0.01-

0.1um, when less than 0.01um, the lithium ion penetration ability is too small, greater than

At 0.1um, the battery is prone to short circuits when dendrites are generated inside the battery.

The electrode particles currently used are generally in the order of 10 microns, while the conductive additives used are in the order of 10 nanometers. Fortunately, carbon black particles tend to aggregate to form large particles. Generally speaking, a diaphragm with a submicron pore size is sufficient to prevent the direct passage of electrode particles. Of course, it is not ruled out that some electrode surfaces may not be well resolved, and there may be situations such as micro short circuits caused by high dust content.

⑥ Puncture strength of 18650 lithium-ion battery separator

Puncture strength: At a certain speed (3-5 meters per minute), a needle with a diameter of 1mm without sharp edges is directed towards a circular fixed diaphragm, which is the maximum force applied to the needle to penetrate the diaphragm.

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