About time pointy-headed folks come up with something useful.
This is from over 2 years ago and the Ambri outfit (name change included) is over 8 years old and I don't remember hearing anything about this.
I like the idea, use readily available materials, avoid the instability issues of things like lithium-ion.
Became suspicious of why this hasn't rocketed off as a practical solution.
Did some digging, not a lot out there, but about a year before this presentation,
Ambri cut a quarter of their staff and pushed back commercial sales, largely due to a seal problem on their units, and then there is this
this article from last August that says they are still pursing their energy storage plans and their revised target of units for 2018 have been kicked to 2020. And, as stated in the article they are having traction issues since there isn't at present much demand for or providers of long term battery storage units (ironically due to the former). Other players have pretty much fizzled out so they are the most viable option in this alternative storage world and are more guarded about their materials formula now. It may yet pan out, and as more fragility in the existing grid is exposed (we are long overdue for a major upgrade in the whole transmission!) it may jump start demand and provide more capital in-flow to ramp it up, but as long as the existing grid holds up and doesn't get more expensive there will be little impetus to alter thinking and behavior. Actually knowing things are fragile and could leave you floundering in catastrophe without a better backup plan than daisy-chaining gas-fed generators is the right time to plan contingencies if for no other reason than survival, but there you are.