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Title: Recent Developments and Trends in Redox Flow Batteries

Book ·

Stationary energy storage systems are needed to facilitate the widespread integration of intermittent renewable electricity generators, such as solar photovoltaic and wind turbines, and to improve the energy efficiency of the electrical grid. While no single technology can meet all needs, redox flow batteries (RFBs) have shown a favorable balance of cost, safety, and performance for many high-value applications. RFBs are rechargeable electrochemical devices that utilize the reversible redox reactions of two soluble electroactive species for energy storage. A compelling feature of the RFB configuration is the independent scaling of power and energy which enables cost-effective implementation of electrochemical couples with low energy density. Aqueous RFBs have been the subject of the vast majority of research efforts to date, which have yielded industry-level demonstrations. By comparison, non-aqueous RFBs are still in their infancy but have the potential for high energy density due to the extended stability window of non-aqueous electrolytes and the enriched selection of redox materials due to the broad variety of organic solvents. This chapter aims to introduce emerging, potentially transformative, strategies for enhancing RFB technologies through molecular design, electrolyte development, and cell-level engineering. Detailed discussions focus on recent developments in redox active materials (inorganic – aqueous, organic – aqueous, inorganic – non-aqueous, and organic – non-aqueous) and in system design (interdigitated flow fields, semi-solid flow cells, and hybrid flow cells). Future research directions and key challenges for RFB technologies are also highlighted.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI ID:
2205186
Country of Publication:
United States
Language:
English

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