An aluminium oxide power cell is an electric battery that uses aluminum to produce electricity. It has about 8 times the capacity of a rechargeable lithium battery but does not require recharging.
Aluminium is a common metal used in power cells and can be found in many applications. It is easily shaped to make electrodes and is relatively inexpensive. It can also be dissolved in water to form a solution, such as hydrated aluminium oxide.
Alumium batteries use a passivation film to prevent corrosion of the aluminum electrode. The passivation film is usually a thin layer of aluminum oxide. The electrolyte used in these cells is a neutral sodium chloride or potassium chloride solution.
These batteries have a low corrosion rate in their electrolyte and a long life under open-circuit conditions. However, the discharge rate is limited by the ionic conductivity of the passivation film and the electrolyte.
The solid electrolyte interphase (SEI) that forms on the Al anode in batteries with corrosive electrolytes is not well understood, but is thought to play an important role in enabling reversible operations of these cells. Various corrosive electrolytes have been investigated for use in these batteries, but some have limitations that could prevent their practical use.
One possible electrolyte for an aluminium battery is a chloroaluminate ionic liquid, which is a mixture of an organic aqueous chloride with AlCl3 in the aqueous electrolyte. However, this type of ionic liquid is highly exothermic and difficult to prepare.