The
normalLiCl
film formed on lithium in
LiAlCl4‐SOCl2
was examined in a scanning electron microscope. The effects of Fe and polyvinyl chloride (PVC) on the film thickness and morphology were studied and correlated to voltage delay in batteries. The PVC additive decreases the effective film thickness, changes its crystal morphology, and improves voltage delay. Contamination with Fe increases the film thickness and increases the voltage recovery time. When PVC and Fe are present, PVC partially masks the effect of Fe contamination, decreasing the film thickness and improving voltage delay.
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