Sodium-ion battery development took place in the 1970s and early 1980s. However, by the 1990s, lithium-ion batteries had demonstrated more commercial promise, causing interest in sodium-ion batteries to decline.[16][17] In the early 2010s, sodium-ion batteries experienced a resurgence, driven largely by the increasing cost of lithium-ion battery raw materials.[16] Also, the number of patent families reached the number of non-patent publication after ca. 2020, which usually signify the fact that the technology reached the commercialization stage.
https://en.wikipedia.org/wiki/Sodium-ion_battery