w efficient the battery is at using electrons to store and release energy. In this battery, was 74% at a current density of 270 mA/cm2. The plating efficiency decreased when the volume of the polybromide phase was increased or when the charging was carried out over a longer time, which suggests that the Br2 in solution may be causing the decrease in efficiency by corroding the zinc. The zinc was smooth after charging and discharging, however, indicating that the dendrites were not forming rapidly, resulting in much slower battery decomposition.
The authors suggest that future work might explore more tightly complexing agents for bromide. This would have the effect of leaving less free Br2 in the aqueous phase of the battery and slowing corrosion caused by the bromide. If a membrane-less battery resistant to corrosion could be developed and scaled up, it could significantly decrease the capital cost of redox flow batteries.