리튬 표면의 부동태 피막에 미치는 공용매의 영향

Abstract

This study examined the morphological changes in lithium surface immersed in 1 mol dm-3 (M) LiPF6dissolved in propylene carbonate (PC) containing different 1,2-dimethoxyethane (DME) concentrations as a co-solvent. A passivation film was formed on the surface of lithium metal by electrolyte decomposition. The passivation filmformation reactions were significantly affected by the amount of co-solvent, DME, in electrolyte solution. A stablefilm was obtained from the 1 M LiPF6 / PC:DME (67:33) solution in which lithium electrode showed goodelectrochemical performances. Atomic force microscope (AFM) and electrochemical impedance spectroscopy (EIS)results revealed that there were no direct correlations between changes in the surface morphology of lithium metaland the resistance behavior of its passivation film.