Note, the mass of an anode is at most 15% of mass of the modern battery cell. All "metallic" lithium cells still need some mechanical structure to hold lithium

Note, the mass of an anode is at most 15% of mass of the modern battery cell. All "metallic" lithium cells still need some mechanical structure to hold lithium. So, at most you will get a half of the mass of graphite, given that graphite is already a quite lightweight material. For the cost, the second most expensive part in the cell after the cathode is the separator. Close to a third of cell's cost can be the separator. Japanese currently have a near monopoly on high-end separators, with Chinese having the rest of the market.