There are 3 main parts to a Lithium ion cell. The anode, cathode and the seperator. The main constituents of the anode and cathode are the substrate, current collector and the active material. The substrate provides the structural strength needed for the electrode, the current collector facilitates the flow of electrons in and out of the electrode and the active material is what hosts the lithium ions and electrons in its structure. The seperator has a special property that it allows the flow of ions through it but not electrons. Thus, the electrons are forced to travel out of the cell which is what is used to drive a load.