Redox Mediated Electrochemical Systems—From Conventional to Flow Batteries

Low cost, scalable and long-life energy storage systems are critical for accelerating decarbonization of the electric grid. Department of Energy’s (DOE) Long Duration Storage Shot aims to reduce the cost of grid-scale energy storage by 90% in the next decade for systems with durations of 10+ hours. Redox targeted concept applied to broad class electrochemical processes are relevant to energy storage and conversion in both aqueous and nonaqueous media.^1-2 Target solvated-ion interaction coupled with facile electron transfer at the phase boundary between redox tuned mediators and high-capacity electrode materials when optimized are drivers for high energy density and rate performance. For example, mediated redox flow batteries (RFBs) could potentially overcome the current bottleneck in both energy density and cost by utilizing low-cost organic mediators work in tandem with earth abundant high-capacity electro-active materials (Na, S, Mn and Fe) thereby, increasing energy density by 10X with a significant reduction in material cost. The talk will focus on role of redox mediated processes to enable performance in RFBs, solid-state and Li and Na compounds.^3-4<br/><b>Acknowledgment </b><br/>This research is supported by Energy Storage Program, Office of Electricity, Department of Energy<br/>References<br/>Yan et. al. Adv. Mater. 2018, 30, 1802406<br/>Li et. al. Materials Today Energy 5 (2017) 15-21<br/>Gao et. al. <i>J. Am. Chem. Soc. 2021, 143, 18188−18195</i><br/>Self et. al. ACS Energy Lett. 4, 2593-2600, 2019,