LiFePO4-ferri/ferrocyanide redox targeting aqueous posolyte: Set-up, efficiency and kinetics

Redox Targeting Flow Batteries (RT-RFB), in which a solid insertion material reacts with soluble flowing active species (the mediators), were recently developed as alternative to the stellar vanadium technology. We have studied and optimized posolyte having LiFePO4 ferri/ferro cyanide complexes mediator DMSO/water solvent mixture. particles shaped dense pellets controlled total porosity, obtained by Spark Plasma Sintering using NaCl microcrystals hard template. The redox potential of couple was tuned playing ratio order match insertion/uptake solid. High reversibility fast kinetics mediator/solid reaction chemically assessed ex-situ. Electrochemical results under flow showed perfect reversibility, full complex, linear increase capacity quantity added best performances are 40% porous at current density 0.25 mA cm?2. In these conditions, is reached for both material, first-cycle 99 %, doubling only 1 vol% electrolyte.