Mathematical Model of a Zinc/Bromine Flow Cell.

A mathematical model is presented for a zinc/bromine flow cell. The model includes a thin porous layer on the bromine electrode and a porous separator. The independent parameters of the porous layer are defined and their effect on cell performance during charge and discharge is investigated. The dependence of the round-trip energy efficiency on the thickness of the porous layer and mode of discharge is presented. The predictions of the model show that a maximum round-trip energy efficiency of 70% should be possible under the design conditions considered.