It’s worth noting that research tends to lead manufacturing by ten to fifteen years. Mostly just down to the fact that making a few kilograms of something in a lab is a far cry from making and assembling tons an hour. Research also tends to take time to move between technologies, as most scientists don’t like to abandon projects half way though just becuse someone else published something interesting.

Also, while I don’t watch the battery space to closely, from my understanding there has traditionally been safety considerations stemming from large quantities of sodium given its tendency to react rather hot and fast when exposed to water.