Reference work entry
There are strong demands for electric source with large capacity from electric vehicle and leveling electric power from renewable energy source like photo voltaic cell or wind mill power generator. In general battery, active materials which shows redox during charge and discharge are requested for both electrodes. Metal-air batteries have been attracting considerable attentions because of their extremely large specific capacity. The reason for such a large specific capacity is that these cells consist of metal as an anode and an air electrode for activation of oxygen in air; oxygen is used as active materials and not necessary to be stored in battery. Hence, these metal-air batteries work as a half cell and have a simple structure. The capacity and theoretical open circuit potential for some metal-air batteries are compared in Table 1. Among the various metal-air battery systems, the lithium-air battery is the most attractive one because it has the highest energy density...
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