Aqueous organic flow batteries have attracted dramatic attention for stationary energy storage due to their resource sustainability and low cost. However, the current reported systems can normally be operated stably under a nitrogen or argon atmosphere due to their poor stability. Herein a stable air-insensitive biphenol derivative cathode, 3,3',5,5'-tetramethylaminemethylene-4,4'-biphenol (TABP), with high solubility (>1.5 mol L^–1) and redox potential (0.91 V vs. SHE) is designed and synthesized by a scalable one-step method. Paring with silicotungstic acid (SWO), an SWO/TABP flow battery shows a stable performance of zero capacity decay over 900 cycles under the air atmosphere. Further, an SWO/TABP flow battery manifests a high rate performance with an energy efficiency of 85% at a current density of 60 mA cm^–2 and a very high volumetric capacity of more than 47 Ah L^–1. This work provides a new and practical option for next-generation practical large-scale energy storage.

由于其资源可持续性和低成本，水系有机液流电池在固定式储能领域引起了广泛关注。然而，目前报道的系统由于稳定性较差，通常可以在氮气或氩气气氛下稳定运行。这里是一种稳定的空气不敏感双酚衍生物正极，3,3',5,5'-四甲胺亚甲基-4,4'-双酚 (TABP)，具有高溶解度 (>1.5 mol L ^–1) 和氧化还原电位（0.91 V vs. SHE）是通过可扩展的一步法设计和合成的。与硅钨酸 (SWO) 相比，SWO/TABP 液流电池在空气气氛下显示出 900 次循环后零容量衰减的稳定性能。此外，SWO/TABP 液流电池表现出高倍率性能，在 60 mA cm ^–2的电流密度下能量效率为 85%，体积容量超过 47 Ah L ^–1。这项工作为下一代实用的大规模储能提供了一种新的实用选择。