Original research article this development appears to be based on was published in 2015 is available on sci-hub, just paste the title in: Rhombohedral Prussian

Original research article this development appears to be based on was published in 2015 is available on sci-hub, just paste the title in: Rhombohedral Prussian White as Cathode for Rechargeable Sodium-Ion Batteries It's notable that it was an ARPA-E funded project and some of the research was done at Lawrence Berkeley National Labs. It's more applied research than basic research as they were specifically looking for a setup that would work with existing battery manufacturing technology. > "Compared with previous work, the high Na concentration in the new material overcomes the sodium-deficiency problem. We show that it could be directly assembled into a full cell with a hard carbon anode. This is critical for the scalable sodium-ion battery manufacture that is compatible with the current lithium-ion battery infrastructures." Interesting timeline: from publication of research result to commercial development to deliverable product, ~8 years. Now, would a VC fund think that was a decent turnaround time - I really don't know, any opinions?