Designing Membranes for Aqueous Alkaline Flow Batteries from Polymers of Intrinsic Microporosity

The amidoxime units are ionizable, allowing exceptional conductivity without sacrificing blocking ability. The resulting cells outlast those with Nafion (e.g. above Zn–TEMPO-sulfate cell).

Scientific Achievement

The incorporation of amidoxime units along the rigid backbone of a polymer of intrinsic microporosity to make them aqueous-compatible (AquaPIMs) allows for exceptional conductivity and stability in harsh alkaline environments while blocking a variety of active materials.

Significance and Impact

AquaPIMs can achieve up to 22 mS cm–1 conductivity in highly alkaline electrolytes, outperforming state of the art perfluoroalkylsulfonate membranes.

Research Details

  • High conductivity is demonstrated in a variety of electrolytes
  • AquaPIM outperforms commercial membranes’ blocking ability for a variety of active materials
  • The implementation of AquaPIM membranes in a variety of battery chemistries allows for extended cycle life compared to commercial membranes

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DOI: https://doi.org/10.1016/j.joule.2019.08.025

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