Redox flow batteries (RFB) have the unique advantage of decoupling power and energy providing much needed flexblity under load condition for a number of applications such as grid scale storage. Conventional Vanadium based RFB has been commercialized but they still have high cost per unit of storage and low energy density. Recently we demostrated the concept of anion radical mediated Na-ion based RFB where one can acheive very high capacity using tailored redox mediator and red phosphorus (P).1 Capacity in the excess of 800 mAh/g was obtained by mediating Na-biphenyl and pyrene as mediator with P as anode. Conventional Na-beta alumina was used as the membrane to demonstrate the proof-of-principle. The talk will cover our recent work on using sodium polysufide based (Na2Sx) catholyte and new approach towards developing polymer composite membranes with exceptionally high mechanical strength and high Na-ion conductivity. One of the example include a facile one step in-situ synthesis and fabrication of high ion-conducting glass fiber (GF) reinforced, crosslinked poly(ethylene oxide) (cPEO) composite polymer electrolyte with exceptionally high elastic modulus (up to 2.5 GPa) over a broad temperature range (20 °C – 245 °C). Detailed characterization elucidating the membrane and peformance of teh RFB will be presented.

Membranes and catholytes for sodium-ion based redox flow batteries

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.