2normalMethyl‐normaltetrahydrofuranfalse(2normalMe‐THFfalse)/LiAsF6 and several diethyl ether false(DEEfalse)/LiAsF6‐normalbased electrolytes have been characterized for their usefulness in rechargeable normalLi/TiS2 cells. This characterization has involved extended room temperature cell cycling at various depths of discharge, evaluation of rate/capacity behavior of cells at 25° and −10°C, and storage of cells at 50°C for up to one month with subsequent cycling. The thermal stability of the electrolytes at 71°C was evaluated by storage experiments in sealed tubes, followed by product analysis. The performance of 2normalMe‐THF/LiAsF6 cells far surpassed the others. The present data further substantiate previous reports from this laboratory of the superior behavior of 2normalMe‐THF/LiAsF6 solutions in rechargeable Li cells. The DEE/LiAsF6‐normalbased electrolytes are too unstable thermally to be of practical use.

Practical usefulness of Cr0.5V0.5S2 as a rechargeable positive electrode for ambient temperature Li cells has been assessed. The rate‐capacity behavior of the Cr0.5V0.5S2 cathode has been evaluated as a function of carbon content, electrolyte, and temperature. Rechargeability of the disulfide has been investigated by extended cycling of Li cells utilizing 2normalMe‐THF/LiAsF6 . Cells with cathode capacities as large as 10 Ahr have been constructed and tested. Many cells have exceeded 200 deep discharge‐charge cycles. A scheme of studies useful for assessing the practicality of potential solid cathodes for ambient temperature rechargeable Li cells is presented.

Hinsichtlich der Verwendung von geschichteten Disulfiden als IntercaIationsoder lnsertions‐Elektroden wurde Cr.,‐5V.,‐5S3 (mit 10‐30 Gew.‐°/o Cund I0 Gew.‐% Teflon) als wiederaufladbare Elektrode in Li‐Zellen getestet.