Redox flow batteries (RFBs) are considered to be one of the most promising large-scale energy storage technologies necessary for massively integrating renewables energy into the grid. Herein we report a novel organic redox-active liquid anolyte material, 3-methylbenzophenone (3-MBP), towards the development of all organic RFBs that possess potentially high voltage and energy density. 3-MBP is liquid at room temperature and highly miscible with most organic solvents. Under electrochemical conditions, 3-MBP displays high reversibility and stability during cycling at a low potential window. Furthermore, a proof-of-principle cell using 1,4-di-tert-butyl-2-methoxy-5-(2-methoxyethoxy)benzene as the catholyte shows an open circuit potential of 2.89 V with stable cycling performance as indicated by the cell efficiencies. This work offers a promising anolyte candidate along with an organic electrochemical molecules model for high voltage and energy density RFBs applications.

氧化还原液流电池（RFB）被认为是将可再生能源大规模整合到电网中所必需的最有前途的大规模储能技术之一。在本文中，我们报告了一种新型的有机氧化还原活性液态阳极电解液材料3-甲基二苯甲酮（3-MBP），以开发具有潜在高电压和高能量密度的所有有机RFB。3-MBP在室温下为液体，可与大多数有机溶剂高度混溶。在电化学条件下，3-MBP在低电势窗口下循环过程中显示出高可逆性和稳定性。此外，使用1,4-二叔丁基-2-甲氧基-5-（2-甲氧基乙氧基）苯作为阴极电解液的原理证明电池显示2.89 V的开路电势，具有稳定的循环性能，如电池效率。