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REDOX FLOW BATTERIES Chapter 6

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REDOX FLOW BATTERIES Chapter 6 ( redox-flow-batteries-chapter-6 )

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process) or the polyolefin resin is mixed with a hydrocarbon liquid; the melt is extruded, oriented, and the liquid phase extracted (wet process). The advantage of these materials is their relatively low costs, compared to PFSA and their durability in electrochemical environments. The disadvantage of these materials in flow batteries, however, is transport selectivity, because the permeation of species through the membrane is regulated only by size exclusion. R&D in this area seeks to control pore size/density synthetically; recent review papers provide more details [45, 46]. 3. Concluding Remarks RFBs offer a unique, adaptable solution to meet a wide range of energy storage requirements of the future. By decoupling energy and power, RFBs can be designed for a range of energy storage and power demands. The near limitless possibilities for electrolyte chemistries further play to RFBs advantage, allowing them to stay at the cutting edge while other more traditional chemistries (e.g. Pb-acid) rise and fall. Moreover, several key features of RFBs can make them significantly safer than other electrochemical energy storage technologies. In sum, the push toward longer duration energy storage, firming up wind and solar resources, coupled with the drive for safer, less-flammable energy has put flow batteries in a unique position to increase market share in the near future. Leo J. Small is a materials scientist and electrochemist at Sandia National Laboratories in Albuquerque, New Mexico. His work focuses on understanding and manipulating ion movement in electrochemical and energy storage systems. Dr. Small received his bachelors from Cornell University and PhD from Rensselaer Polytechnic Institute, both in Materials Science. Cy H. Fujimoto is a polymer chemist at Sandia National Laboratories in the Nanoscale Sciences Department. His work has been developing membranes for electrochemical systems. Dr. Fujimoto obtained his PhD in inorganic chemistry from the University of California, Irvine in 2001. Harry D. Pratt III is a distinguished technologist in the Advanced Power Sources R&D group at Sandia National Laboratories. Since 2011, Harry has assembled, tested, and optimized hundreds of flow batteries across a wide variety of chemistries. Chapter 6 Redox Flow Batteries 9

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