This , and I think the price will comedown a lot and soon, market pressure will see to that asap. We have yet to really see the economy of scale that is coming through and r&d for batteries is at a all time high. Plenty of promising developments in the very near future including the one cited in the op

But is this not the tech that Toyota is bring to market ?, they have a working prototype I believe.

But in my lifetime battery tech has improved tremendously. Even in the last 5 years charge density and speed of recharge has had massive improvements.