Zinc Bromide is primarily for stationary applications and is unlikely to replace LiIon for mobile applications. It has a fluid pumping infrastructure that makes these flow type systems much more complicated than LiIon or NiMh etc. They have some advantages but also disadvantages like the need to be fully discharged regularly to eliminate the problems of build up of zinc structures in the wrong places relative to the membrane. So not better or worse than Lithium , just different. Any development of battery technology is to be welcomed as it furthers the cause of renewable energies as well as pushing the envelope for better EV outcomes.