Li ion Battery Separator is one of the key internal components of lithium-ion batteries. In the structure of lithium-ion batteries, the separator is between the positive and negative electrodes, and its main function is to isolate the positive and negative electrodes and prevent the two electrodes from directly contacting each other and causing a short circuit.

The lithium-ion battery separator is a critical functional thin-film material within lithium-ion batteries, used to physically separate the positive and negative electrodes while allowing lithium ions to freely pass through during charging and discharging.