The performance characteristics of the Li / SOCl 2 cell have been determined as a function of discharge rate, electrolyte composition, cathode thickness, and cell temperature. Cells have been discharged at rates ranging from about 3 to nearly 300 mA/cm 2 . Cathodes with electrolyte solutions have contained either LiAlCl 4 or AlCl 3 , with the most efficient discharge characteristics being realized with 1.5 M LiAlCl 4 and 4.5 M AlCl 3 solutions. The use of pure AlCl 3 dissolved in SOCl 2 as the electrolyte results in substantially higher average discharge voltages and discharge capacities than can be achieved with cells containing the conventional LiAlCl 4 electrolyte. With both electrolytes, however, the discharge capacity per unit cathode volume (the effective cathode utilization) decreases with increasing cathode thickness, the rate of decrease being greater the higher the discharge current density. Increasing cell temperature results in an improvement in cathode utilization and a decrease in overvoltage, again with both LiAlCl 4 and AlCl 3 electrolyte solutions.
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Klinedinst et al. (1980) studied this question.