Development of Li--Al/FeS Cells with LiCl-Rich Electrolyte

摘要

Rechargeable lithium--aluminum/iron sulfide cells using the LiCl--KCl eutectic (44 wt % LiCl) electrolyte are being developed at Argonne National Laboratory. The utilization of these cells at high discharge rates has been hindered by the formation of J phase (LiK sub 6 Fe sub 24 S sub 26 Cl) in the FeS electrodes. To overcome this problem, four engineering-size cells (approx. 100 Ah theoretical capacity) were built with LiCl-rich electrolyte (54 wt % LiCl). At the 4-h rate, the utilization of these cells was improved by more than 40% over that of cells containing the eutectic electrolyte. 5 figures, 4 tables. (ERA citation 04:030304)