Preparation of Electrolyte for Vanadium Redox‐Flow Batteries Based on Vanadium Pentoxide,Energy Technology

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Preparation of Electrolyte for Vanadium Redox‐Flow Batteries Based on Vanadium Pentoxide
Energy Technology ( IF 3.6 ) Pub Date : 2020-07-21 , DOI: 10.1002/ente.202000522
Jan Martin ₁ , Katharina Schafner ₁ , Thomas Turek ₁

Affiliation

The vanadium redox‐flow battery is a promising technology for stationary energy storage. A reduction in system costs is essential for competitiveness with other chemical energy storage systems. A large share of costs is currently attributed to the electrolyte, which can be significantly reduced by production based on vanadium pentoxide (V₂O₅). In this study, the dissolution kinetics of V₂O₅ in diluted sulfuric acid and commercial vanadium electrolyte (VE) is determined. The low solubility of V₂O₅ in sulfuric acid can be overcome by partially using VE with a state of charge of −50% as solvent. In this way, a complete dissolution of V₂O₅ is possible within ≈10 min to achieve the desired vanadium concentration of 1.6 mol L⁻¹. Moreover, the electrochemical reduction of an electrolyte containing VO₂⁺ coupled with the oxygen evolution reaction at the anode is investigated. For these consecutive steps, an electrical energy demand of 1.69 kWh kg⁻¹ is required to reach a state of charge of −50%. Finally, both processes are integrated into a plant concept for continuous electrolyte production.

中文翻译：

基于五氧化二钒的钒还原流电池电解液的制备

钒氧化还原液流电池是用于固定式能量存储的有前途的技术。降低系统成本对于与其他化学能源存储系统的竞争力至关重要。当前，大部分成本归因于电解质，通过基于五氧化二钒（V ₂ O ₅）的生产可以显着降低成本。在这项研究中，确定了V ₂ O ₅在稀硫酸和市售钒电解质（VE）中的溶解动力学。V ₂ O ₅在硫酸中的低溶解度可通过部分使用电荷状态为-50％的VE作为溶剂来克服。这样，V ₂ O ₅完全溶解在约10分钟内可能达到1.6 mol L ^-1的所需钒浓度。而且，研究了含VO ₂⁺的电解质的电化学还原以及在阳极的氧释放反应。对于这些连续步骤，需要达到1.69 kWh kg ^-1的电能才能达到-50％的充电状态。最后，这两个过程都被整合到一个工厂的概念中，以连续生产电解质。

更新日期：2020-09-05

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