Aluminium batteries
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United States of America Patent
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-
Apr 2, 1991
Grant Date -
N/A
app pub date -
Aug 4, 1989
filing date -
Aug 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An aluminum battery comprises an aqueous alkaline electrolyte and an anode which is an alloy of aluminum containing magnesium and/or calcium. Tin is present in the electrolyte (as stannate at a concentration of 0.001 to 0.01 M) and/or in the anode (at a concentration of at least 0.005%). The batteries operate at high coulombic efficiency at both high and low current densities. Preferred conditions of operation comprise drawing current at an average current density of 5 to 400 mA/cm.sup.2 of anode surface for at least one hour, and introducing seed crystals into the electrolyte to aid precipitation of aluminum values from the electrolyte.
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