In this work, a kind of ethylene glycol-based deep eutectic solvent (DES) is explored as electrolyte of an iron-vanadium redox flow battery and the effect of the applied magnetic field is studied, including the physical and electrochemical characteristics of positive and negative DES electrolytes, as well as the performance of DES redox flow battery with/without magnetic field. The experimental results show that after adding a magnetic field, the viscosity of the DES electrolytes decreases, while the conductivity increases. As the intensity of the added magnetic field becomes larger, both the oxidation and the reduction peak current densities of the positive and negative DES electrolytes increase. With a magnetic field of 605 mT, the oxidation peak current density increment is up to 41.56%, and the reduction peak increases up to 30.74%. The exertion of magnetic field also leads to increased limiting current and power density, improved energy efficiency, and extended battery operating time of the iron-vanadium DES-electrolyte redox flow battery. This work exhibits a promising prospect for the application of an external magnetic field to non-aqueous redox flow batteries.

在这项工作中，探索了一种基于乙二醇的深共熔溶剂 (DES) 作为铁钒氧化还原液流电池的电解质，并研究了外加磁场的影响，包括正负极的物理和电化学特性。 DES电解质，以及有/无磁场的DES氧化还原液流电池的性能。实验结果表明，加入磁场后，DES电解质的粘度降低，而电导率增加。随着外加磁场强度的增大，正负极DES电解质的氧化和还原峰值电流密度均增加。在605 mT的磁场下，氧化峰电流密度增量高达41.56%，还原峰增加了30.74%。磁场的施加还导致铁钒DES-电解质氧化还原液流电池的极限电流和功率密度增加，能量效率提高，并延长电池运行时间。这项工作展示了将外部磁场应用于非水氧化还原液流电池的广阔前景。