Silver-oxide Aluminium (AgO-Al)
Silver oxide-aluminium cells have an aluminium anode and a silver oxide cathode (degree of oxidation II). They are used in a Volta stack for underwater torpedo propulsion. Because the sodium hydroxide electrolyte solution reacts with the aluminium, it is prepared from sodium hydroxide in solid form and only fed into the cell core when the device is fired. Before this is done the cell is inert and thus risk-free. Because all components, including the electrolyte, are in solid form, prolonged storage is possible with no deterioration in performance. Temperature control during discharge is by renewal of the electrolyte.
AgO-Al batteries have high energy density and power consistent with torpedo range and speed.