Zinc air battery
Zinc air batteries are receiving a significant attention in the last years. They have a high capacity, low cost, low toxicity and they are competitive with state of the art batteries (Li-ion, NiMH). In zinc-air batteries, zinc is oxidized by oxygen taken from the surrounding air. Battery is constructed from four components: zinc anode, air cathode, separator and electrolyte (Figure 1).
The wider application is limited by a several factors:
- Hydrogen evolution on anode during charging and zinc corrosion
- Dendrite formation at zinc anode during cycling
- Overpotentials at air cathode
- Degradation of the electrolyte caused by CO2.