Joule
Volume 6, Issue 4, 20 April 2022, Pages 718-720
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SPEEK scaling UP

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In this new issue of Joule, Xianfeng Li and colleagues demonstrated the pilot scale roll-to-roll synthesis of sulfonated poly(ether ether ketone) (SPEEK) membrane and the scaling up of zinc flow batteries (ZFBs) stack 300–4000 W with membrane area up to 3 m2. Compared to expensive Nafion membranes ($500–1500 m−2), cost analysis demonstrated the significant cost reduction of SPEEK membranes to $12 m−2 and subsequently enormous cost reduction of flow battery stacks. This cost reduction will advance the manufacturing of flow battery systems for large-scale energy storage plants.1

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