A study of the production of vanadium electrolytes from ammonium metavanadate

Seidakhmetova N. Zhumakynbai N. Akhmetov A. Ondiris B. Alimzhanova A. Berdikulova F.
2025 SciCell s.r.o.

Acta Metallurgica Slovaca
2025 #31 Issue 3 200 - 206 pp.

This work presents a technology for producing vanadium electrolytes with average oxidation states of V23+ and V4 3+ for application in vanadium redox flow batteries (VRFBs). Ammonium metavanadate (NH4VO3), a comparatively low-cost raw material, was used as a precursor and subjected to calcination to obtain a mixture of vanadium oxides (V2O4 and V2O3), which are readily soluble in sulfuric acid. The conditions of calcination, chemical reduction with oxalic acid, and electrochemical reduction on a titanium cathode with a proton-conducting membrane were investigated. Optimal calcination parameters (5 h at 500°C) were established, ensuring the high solubility of the products. The electrochemical reduction method enabled the production of electrolytes with the target oxidation state at current densities ranging from 1000 to 2200 A/m and VO2 concentrations of up to 10^4 g/L. Cyclic voltammetry confirmed the quasi-reversible nature of the processes for the V +/V + and V4+/V3+ redox couples, indicating the high electrochemical activity of the electrolyte. The proposed technology reduces the production cost of electrolytes by using an accessible raw material and minimising the consumption of reductants, making it promising for industrial application in VRFB-based energy storage systems.

ammonium metavanadate , chemical reduction , electrochemical reduction , reducing , roasting , vanadium electrolyte

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RSE National Centre on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan, Zhandosova Street No. 67, Almaty Province, Almaty, 050036, Kazakhstan

RSE National Centre on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan

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