Lithium is a key component in both the cathode and anode of lithium-ion batteries. In the cathode, it is often found in compounds like lithium cobalt oxide (LiCoO₂), lithium iron phosphate (LiFePO₄), and lithium nickel manganese cobalt oxide (NMC). In the anode, lithium can be used in the form of lithium metal or intercalated in graphite. Lithium enhances the battery’s energy density, allowing for longer-lasting, lightweight, and efficient power storage.