Inorganic ammonium phosphate-containing positive electrode electrolyte for whole vanadium flow battery

The invention relates to an inorganic ammonium phosphate-containing positive electrode electrolyte for whole vanadium flow batteries. The inorganic ammonium phosphate comprises one or more than two selected from ammonium orthophosphate, ammonium metaphosphate, ammonium phosphite, ammonium phosphinate or polyphosphate ammonium salt; and the concentration of the inorganic ammonium phosphate in aqueous solution of the positive electrode electrolyte is 0.1-0.25 mol / L. The invention uses the inorganic ammonium phosphate as the additive for positive electrode electrolyte, so as to on one hand reduce the polarization phenomenon in the charge and discharge process of battery and realize improvement of voltage and energy efficiency of the battery, and on the other hand effectively inhibit serious capacity attenuation in high temperature operation to achieve stable operation of battery. The preparation technology of the invention has the advantages of simple operation, energy saving, environment-friendliness and low cost, and can realize the stable operation of electrolyte the in circular process of the battery.