Solid state lithium batteries, which are starting to roll out now, are big enough jump. They have 50-80% more capacity which gives enough range for a day of driving. They charge faster so can charge on regular stops. They aren't flammable.

Cars don't need triple energy density, 600mi range and 15min charge is plenty. There is cost factor, but batteries have gotten cheap that isn't an issue. People talk about lithium shortage but it hasn't shown up.