Main elements Separator: Membrane that prevents contact between the electrodes while allowing lithium ions to pass through. Anode (negative pole): Electrode that stores lithium ions when the battery is charging. Lithium metal oxide: Cathode material that releases and reabsorbs lithium ions. Anode (negative pole): Anode material into which lithium ions are inserted during charging. Cathode (positive pole): Electrode that receives lithium ions during discharge. Lithium ion: A positively charged particle that moves through the electrolyte to power the battery. How a lithium-ion battery works Dangers of lithium batteries