No, I have no idea what it is either.
However, I would scream with laughter if this foolish idea of what it is were in fact true.
So, their problem. They want to use solid lithium. OK, but that means dendrites. Akin to tin whiskers that so plagues solders. With solder you get around it by adding lead, or bismuth.
They have patented at least one step on the path to solving that, alloying with lanthanum, a rare earth.
OK. So, now the leap. What if it is scandium which provides the non-dendrite forming solid state battery material?
You heard the rumour here first – there is, after all, a one in 91 chance that it’s right too…… and given that Li and Sc both alloy well with aluminium it’s not an entirely stupid and ridiculous leap either.