ENVIRONMENTALLY FRIENDLY ZINC/AQUEOUS POLYSULFIDE RECHARGEABLE FLOW BATTERY WITH HIGH ENERGY EFFICIENCY

The present invention relates to a zinc/aqueous polysulfide rechargeable flow battery (100) made of - a first half-cell (110) comprising a first electrolyte (114) containing a source of Zn2+ ions and a static (112) or flowable electrode disposed within the first halfcell, said first half-cell being connected in a closed-loop configuration through a first pump (116) to a first external tank (115) containing the first electrolyte; - a second half-cell (120) comprising a second electrolyte (124) in which polysulfides are dissolved and a static (122) or flowable electrode disposed within the second half-cell, said second half-cell being connected in a closedloop configuration through a second pump (126) to a second external tank 125) containing the second electrolyte; and - a catalyst in the second half-cell, on the surface of a static electrode or dispersed in form of particles in the second electrolyte; and - a separator (130) between the two half-cells. The rechargeable flow battery of the invention avoids the use of toxic or environmentally harmful chemicals.