Zinc–bromine battery
| Specific energy | 60–85 W·h/kg |
|---|---|
| Energy density | 15–65 W·h/L (56–230 kJ/L) |
| Charge/discharge efficiency | 75.9% |
| Energy/consumer-price | US$400/kW·h (US$0.11/kJ) |
| Cycle durability | >6,000 cycles |
| Nominal cell voltage | 1.8 V |
A zinc-bromine battery is a rechargeable battery system that uses the reaction between zinc metal and bromine to produce electric current, with an electrolyte composed of an aqueous solution of zinc bromide. Zinc has long been used as the negative electrode of primary cells. It is a widely available, relatively inexpensive metal. It is rather stable in contact with neutral and alkaline aqueous solutions. For this reason, it is used today in zinc–carbon and alkaline primaries.
The leading potential application is stationary energy storage, either for the grid, or for domestic or stand-alone power systems. The aqueous electrolyte makes the system less prone to overheating and fire compared with lithium-ion battery systems.