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electrodes with surface films which are porous and rough on their solution side. Li deposition in LiPF6 solutions was found to be more uniform than in LiClO4 solutions. This correlates very well with previous studies (Fourier transform infrared, energy dispersive x-ray spectroscopy, and x-ray photoelectron spectroscopy) which revealed that different surface chemistries are developed on the electrodes in these systems.9 In LiC1O4 solutions the surface films comprise a mixture of ROCO2Li, Li2CO3, Li halides, and LiOH-Li20, while in LiPF6 solutions LiF is the major surface species. This may lead to the conclusion that the more homogeneous the composition of the surface films, the more uniform is Li deposition.

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