Secondary delta -LiAl/TiS/sub 2/ cells

Development of safe secondary Li batteries is linked to the ability to manage the chemical activity of the anode. One possible replacement for elemental Li is the alloy delta -LiAl, which is available with a wide composition range. Laboratory cells containing alloy anodes ranging from 60 w/o Li to 85 w/o Li were cycled using THE:2Me-THF/LiAsF/sub 6/, THF:2Me-THF:dioxolane/LiAsF/sub 6/, or PC:EC:triglyme/LiAsF/sub 6/ as the electrolyte. Cycling results were compared with those for cells having Li anodes. The figure of merit for anode cycling was determined for the various alloy compositions. Using laboratory cell performance and ease of fabrication as a guide, the 70 LiAl alloy was selected as the best all-around choice for comparison studies with Li anodes in AA cells having a nominal 700 mAh capacity. The safety of these practical cells was evaluated using the same electrolytes employed in the laboratory cells. Results presently available indicate no distinct safety advantage for delta -LiAl anode cells.<
>