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<p>Using ammonium metavanadate as the raw material, vanadium trioxide was prepared by using ammonia gas produced by the self-thermal decomposition of ammonium metavanadate and external carbon powder as the reducing agent in a tube furnace. The effects of the reaction temperature, reaction time, and carbon content on the purity of vanadium trioxide were investigated. The results show that high-purity vanadium trioxide with a V content higher than 67% can be obtained after a calcination under 750&#xa0;°C for 6&#xa0;h with 6.8 wt% carbon powder. The prepared vanadium trioxide and vanadium pentoxide reacted in a sulfuric acid system at a certain ratio to obtain a 3.5-valent vanadium electrolyte. The concentrations of vanadium and sulfate were 1.69 and 4.65&#xa0;mol/L, respectively. The prepared electrolyte has good electrochemical performance.</p>

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Preparation of Vanadium Trioxide from Ammonium Metavanadate and Application in Vanadium Redox Flow Battery Electrolyte

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Jinjing Du,
  • Haiyang Lin,
  • Ruitong Zhai,
  • Xun Liu,
  • Xinxin Cui,
  • Dongbo Wang,
  • Bin Wang,
  • Jun Zhu,
  • Heng Zuo,
  • Qian Li,
  • Xihong He

摘要

Using ammonium metavanadate as the raw material, vanadium trioxide was prepared by using ammonia gas produced by the self-thermal decomposition of ammonium metavanadate and external carbon powder as the reducing agent in a tube furnace. The effects of the reaction temperature, reaction time, and carbon content on the purity of vanadium trioxide were investigated. The results show that high-purity vanadium trioxide with a V content higher than 67% can be obtained after a calcination under 750 °C for 6 h with 6.8 wt% carbon powder. The prepared vanadium trioxide and vanadium pentoxide reacted in a sulfuric acid system at a certain ratio to obtain a 3.5-valent vanadium electrolyte. The concentrations of vanadium and sulfate were 1.69 and 4.65 mol/L, respectively. The prepared electrolyte has good electrochemical performance.