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As part of a project aimed at increasing the energy density of the vanadium redox battery for mobile applications, a number of additives was evaluated as precipitation inhibitors to enhance the stability of supersaturated vanadyl electrolytes in . While the saturation solubility of vanadyl sulfate in is less than at , supersaturated vanadyl sulfate solutions could readily be prepared. A blank solution of vanadyl sulfate in began to precipitate after 22 days at , reaching an equilibrium concentration of after 80 days. In the presence of or sodium hexametaphosphate, however, there was no sign of precipitation after 80 days at . ©1999 The Electrochemical Society
Maria Skyllas-Kazacos (Fri,) studied this question.