287
Zinc batteries that offer an alternative to lithium just got a big boost
(www.technologyreview.com)
This is a most excellent place for technology news and articles.
They do. They are just looking for cheap way to store energy. They don't care if batteries are big, heavy and less efficient, they need something as cheap as possible for a range of use cases where cost is important.
Lithium is expensive. My bet is that, on the long term, sodium will be used for such use cases. But in practice decision must account for practical limitations, primarily supply chain