Membrane separators for circulating electrolyte storage batteries

Separator membranes are often the technologically limiting factor in the performance of flowing electrolyte batteries. The increased resistance of an anionic membrane when placed in a FeCl3 solution was related to a decrease in the water content of the membrane. The structure property relationships of anionic permselective membranes was examined. A conductivity model successfully relates the resistance of a membrane to its ion exchange capacity and water content.