Flow battery having a separator membrane comprising an ionomer
AssigneeE. I. Du Pont de Nemours and Company
InventorsRALPH BIRCHARD LLOYD, MURAT UNLU
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Abstract
The invention relates to flow batteries having improved crossover resistance to electroactive species, excellent coulombic and voltage efficiency and durability, which batteries comprise a separator membrane comprising an ionomer having a high equivalent weight, EW, to achieve these performance benefits. The ionomer has an EW of 1150 to 2000. Preferably, the ionomer is a perfluorosulfonic acid ionomer which has substantially all of the functional groups being represented by the formula —SO3X wherein X is H, Li, Na, K or N(R1)(R2)(R3)(R4) and R1, R2, R3, and R4 are the same or different and are H, CH3 or C2H5. Preferably, substantially all of the functional groups are represented by the formula —SO3X wherein X is H.
Claims22
A flow battery comprising a separator membrane, which membrane comprises an ionomer having an equivalent weight, EW, of 1150 to 2000.
A flow battery comprising a separator membrane, which membrane comprises an ionomer having an ion exchange ratio, IXR, of 16 to 33.
Dependencies are inferred from the claim text.