在锂离子电池内，带电离子的原子从阳极通过隔膜进入阴极，达到电能释放。隔膜作为一薄半微孔塑料膜片，分隔开阴阳极，并容许电离子自由通过。

Lithium-ion batteries deliver power when charged atoms (ions) move from the anode, through the separator, to the cathode. The separator is a thin sheet of semi-porous plastic that insulates the anod from the cathode, while allowing ions to pass through.