Abstract
Low concentrations of water in propylene carbonate solutions result in the formation of protective surface layers on lithium electrodes. Increasing concentrations of water have been found by infrared spectroscopy and x‐ray diffraction to result in increasing lithium oxide and decreasing carbonate and polymer content in the layers. The oxide layers are protective and greatly reduce the rate of corrosion reactions of the metal with the electrolyte. They represent the principal resistance to current passage and can be removed by breakdown at high potential. Water‐free solvent interacts differently with lithium resulting in the continuous formation of lithium carbonate and polymeric materials. Use of a thin layer cell with 10 μm electrode separation has been shown to eliminate the effect of low concentrations of water.
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