> That's a scale for the current champion, lithium-ion. They are all currently lithium-ion. What they are varying is the ion. The ion makes a big difference L

> That's a scale for the current champion, lithium-ion. They are all currently lithium-ion. What they are varying is the ion. The ion makes a big difference LiFePO4 is very different to LiMn and its mates (higher cycles and lifetime, lower energy density). A LiS is a different ion yet again. It's not a 3 fold improvement in energy density like the article says, more like twice the density in both volume and weight. And like LiFePO4, no rare earth minerals. It's downfall has been durability (50 cycles or so), but there are now multiple teams announcing 1000 cycles or better in the lab, all using different approaches. It seems inevitable that someone will figure out how to manufacture one of those chemistries at scale in time. Then you will see a step change by a change in chemistry. Without a change in chemistry all you see is improvements in manufacturing which is a gradual thing.