Earlier quoted context omitted.
Energy density and availability of materials. Li-S ballpark is 550 Wh/kg while conventional lithium-ion is around 200 Wh/kg. Using nickel, cobalt, and other expensive metals is not scalable.
Newer Battery Electric vehicle of similar size are not really much heavier then combustion cars of the same size. That boost in weight savings (and poorer duty cycles) would make such more sense for airplanes than cars. The Nickel and Cobalt parts have been declining for decades and are low percentages of *-ode material, especially in cars which are no volume constrained. Only smartphone batteries or similar applianc…
This is why something like Li-S is the holy grail of batteries.