Separator plays the important role of separating the cathode and anode

As an important lithium-ion battery component material, the separator plays the role of separating the cathode and anode, effectively preventing the internal short circuit of the battery, while at the same time allowing lithium ions to pass through. For instance, when battery temperature rises, the separator is closed to block the conduction of lithium ions after reaching a certain temperature, so that the internal circuit of the battery is broken to prevent combustion and explosion caused by excessive temperatures.

Separator

As the separator directly determines the energy density and service life of the battery, the separator has high product performance indicator requirements, which mainly includes:

1)    Chemical stability: the separator should remain stable in the battery and not chemically react with the cathode, anode, and electrolyte, which is mainly measured by corrosion resistance and shrinkage rate.

2)    Wettability: the separator should have excellent wettability to increase the contact between the separator and the electrolyte, which ensures lower resistance and higher ion conductivity, therefore improving battery energy density, and charge and discharge performance.

3)    Safety protection: as the temperature of the battery will rise during charging and discharging. In extreme cases, a short circuit will release a large amount of heat in a short time. At this time, the physical integrity properties of the separator ensures that the short circuit of the cathode and anode is prevented from occurring.