David25 is so concerned about sodium that he only posts on the...

David25 is so concerned about sodium that he only posts on the AGY thread about this, why?

https://www.nature.com/articles/d41586-024-00325-z
But the heavier weight of sodium compared to lithium makes it fundamentally harder to get to high energy densities.
Toyota’s original target date for commercializing them in the early 2020s has now slipped to the late 2020s, for example. When it comes to batteries, “Toyota has said a lot of things in the last ten years, none of which have come through,” cautions Ceder.
The ‘pot of gold’ battery at the end of this solid-state rainbow, many say, would be a lithium–air design. This kind of battery uses a lithium-metal anode, and the cathode is based on lithium binding to oxygen that is pulled from the air and released again when the battery recharges. In part because a key cathode ingredient isn’t stored in the battery, this design can hold much more energy per kilogram. But the idea has long seemed speculative. “Some of my colleagues call it fairy-tale chemistry,” says Nazar.