Secondary δ-LiAl/TiS₂ cells

摘要

Development of safe secondary Li batteries is linked to theability to manage the chemical activity of the anode. One possiblereplacement for elemental Li is the alloy δ-LiAl, which isavailable with a wide composition range. Laboratory cells containingalloy anodes ranging from 60 w/o Li to 85 w/o Li were cycled usingTHE:2Me-THF/LiAsF₆, THF:2Me-THF:dioxolane/LiAsF₆,or PC:EC:triglyme/LiAsF₆ as the electrolyte. Cycling resultswere compared with those for cells having Li anodes. The figure of meritfor 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 forcomparison studies with Li anodes in AA cells having a nominal 700 mAhcapacity. The safety of these practical cells was evaluated using thesame electrolytes employed in the laboratory cells. Results presentlyavailable indicate no distinct safety advantage for δ-LiAl anodecells