CYCLING BEHAVIOR OF LITHIUM ALUMINUM-ALLOYS FORMED ON VARIOUS ALUMINUM SUBSTRATES AS NEGATIVE ELECTRODES IN SECONDARY LITHIUM CELLS

The cycling efficiencies of lithium were examined on various metal substrates using different methods. The efficiency was found to be strongly dependent on the evaluating method and on the alloying process of lithium with the metal substrates. The electrochemical behaviour of the Li-Al alloys formed on several kinds of thin Al substrates were investigated in 1 M propylene carbonate solution of LiClO4 at room temperature. It was found that the cycling behaviour was dependent on the alloying rate of lithium with the Al substrate, and the electrochemically etched Al substrate, having a microstructure of a considerably preferred (1 0 0) orientation and a larger effective surface area, gave excellent cycling behaviour, showing a high cycling efficiency of 90 approximately 85% at a high current density of approximately 7 mA cm-2.