JAC, the Chinese automaker, unveiled a prototype last February equipped with sodium-ion batteries, which could be a turning point for the future of electric mobility. Battery manufacturers have long been testing the use of sodium instead of lithium in electric car batteries. 

Its main advantages are its abundance, the fact that it is nonflammable, and that it performs well at low temperatures. The disadvantages, on the other hand, are its lower energy density—the energy stored per unit volume— which, in the case of the batteries in the JAC test car, is 25% lower than that of lithium batteries.

For now, the cost of sodium batteries is higher due to the small volumes produced and a supply chain that is still underdeveloped. However, the consulting firm BNEF estimates that there could be a bright future for this type of battery, as there is room to improve their energy density, and they can leverage the same infrastructure currently used for manufacturing lithium batteries and utilize the same materials and components, which could make them cheaper than lithium batteries. 

The sodium-ion batteries used in JAC's test model are manufactured by HiNa Battery Technologies, a small and relatively new Chinese battery manufacturer.

You can see more details here.