Evaluation of Precipitation Inhibitors for Supersaturated Vanadyl Electrolytes for the Vanadium Redox Battery

Redox flow batteries: a review

“…Research has continued on this technology since that time. As a promising technology for storing intermittent renewable energy, VRB systems have received perhaps the most attention of all RFBs [16,[27][28][29][30][31][32][33][34][35][36][37][38][39]. In fact, prototypes up to the range of MW in power and MWh in energy-storage capacity have been demonstrated [3,35,[40][41][42][43][44][45][46][47].…”

The Chemistry of Redox‐Flow Batteries

“…5% w/w potassium sulfate,3 %w/w sodium hexametaphosphate,p olyacrylic acid) which inhibit precipitation. [158] Organic (gelatine,x anthan, starch etc.) and inorganic (3 %w/w Aerosil 200, Aerosil 300) substances which cause gelatinization of the electrolyte can be used as stabilizers in vanadium solutions.I norganic salts,o rganic tensides,a nd chemical compounds with hydroxy or amino groups have previously been studied as additives.…”

Towards understanding the poor thermal stability of V5+ electrolyte solution in Vanadium Redox Flow Batteries

“…In reality, the fully charged V 5+ electrolyte solution displays poor stability at elevated temperatures (>310 K) and also at high vanadium concentrations (>2 M) [5][6][7]. This poor stability is witnessed as hydrated V 2 O 5 precipitation, which leads to energy loss and failure of the battery [8,9]. The incapacity to increase the vanadium concentration (>2 M) in the electrolyte solution without increasing the sulfuric acid concentration (>5 M) puts a limit on the maximum energy density of the VRFB (≤25 Wh kg −1 ).…”