Journal
JOULE
Volume 3, Issue 12, Pages 2968-2985Publisher
CELL PRESS
DOI: 10.1016/j.joule.2019.08.025
Keywords
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Funding
- Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- Center for Gas Separations Relevant to Clean Energy Technologies, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001015]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
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Here, we lay the design rules for linking microporous polymer membrane architecture and pore chemistry to membrane stability, conductivity, and transport selectivity in aqueous electrolytes over a broad range of pH. We tie these attributes to prospects for crossover-free electrochemical cell operation. These guiding principles are applied to two emerging cell chemistries for grid batteries: specifically, Zn-TEMPO-4-sulfate and Zn-K4Fe(CN)(6) cells. Key to our success is the placement of ionizable amidoxime functionalities, which are stable at high pH, within the pores of microporous ladder polymer membranes, yielding a family of charge-neutral and cation exchange membranes at low and high pH, respectively-which we call AquaPIMs. Their notably high conductivity (up to 21.5 mS cm(-1) in 5.0 M aqueous KOH) and high transport selectivity (up to 10(4) reduction in active-material permeability through the membrane) suggest exciting opportunities for battery development, even beyond those presently demonstrated.
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