Aluminium–air battery

The aluminum -air battery is a electrically non-rechargeable primary battery whose voltage per cell is 1.2 V and is formed by a chemical reaction of oxygen with aluminum. The aluminum -air battery has a high energy density of 1300 Wh / kg. Due to the relatively high operating costs with other electrical storage systems, however, the aluminum -air battery has only a small distribution. Application are in the military to drive electric vehicles. Achieve electric vehicles with aluminum -air battery as energy storage, with otherwise identical conditions and the same weight, compared to lithium - ion batteries, an approximately 8- times as large in scope.

Since the aluminum -air battery is electrically charged, the spent anode out of aluminum and the electrolyte must be physically replaced in reuse. In addition, the battery has a high self-discharge, and therefore in some applications the electrolyte is filled just before or during operation in the cell. The necessary additional technical facilities are the primary reason for the relatively low prevalence and high operating costs.

Reaction equations

The effluent at the anode of aluminum oxidation during discharge is:

At the cathode made ​​of carbon reduction following occurs:

The redox reaction is:

The terminal voltage of 1.2 V is obtained by using potassium hydroxide as the electrolyte.

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