No we're not. The next step forwards in energy density for Lithium Ion batteries is likely to be 100% silicon anode Li-Ion. This is a very difficult manufacturi

No we're not. The next step forwards in energy density for Lithium Ion batteries is likely to be 100% silicon anode Li-Ion. This is a very difficult manufacturing/engineering challenge but significant progress has been made (look up e.g. Sila Nano and Enovix). These give us a significant step forward in energy density. Then there are solid state batteries. These are more difficult. But again multiple companies with lots of funding are attacking this from all sorts of angles. The OP making this claim as if it's a law of physics is simply wrong.