The battery separators is the part of the electrochemical cell that is placed between the electrodes of opposite polarity.
The term “separator” emphasizes the functionality of isolating the anode from the cathode spatially. Its function is to prevent electric contact of the electrodes, which would cause self-discharge, but simultaneously allows ion flow as a basis for energy delivery.
The separator in lithium ion battery can be either ion conductive (solid electrolytes) or ion-permeable (pervious membranes). However, polymer-based porous membranes are the most commonly used separators for lithium-ion batteries.
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