The nature of protective surface layers formed on lithium in propylene carbonate solutions of LiClO 4 and LiAsF 6 at open circuit has been investigated by electrochemical pulse measurements. The results are consistent with the fast formation of a compact thin layer resulting from the reaction with residual water. This layer acts as a solid ionic conductor. Slow corrosion or decomposition processes produce a thicker porous overlayer.
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Geronov et al. (1982) studied this question.