Abstract:The effects experimental conditions, crystal phase and microstructure of V2O3 for vanadium redox battery prepared by hydrogen roasting and reduction of ammonium metavanadate (AMV) were studied. The results show the optimal test conditions include hydrogen reduction temperature of 575 ℃, hydrogen reduction time of one hour and hydrogen gas flow rate of 100 mL/min, and cooling with furnace after reduction. The samples obtained by the above test scheme are basically all V2O3, the main crystal phase is V2O3, and the grains are full in microstructure and tightly packed together in the form of flake or block. Finally, the battery grade V2O3 can be produced, and qualified vanadium redox battery electrolyte can be prepared.