Abstract
Electrochemical deposition and dissolution of lithium were investigated in some aprotic ionic liquids through a typical inorganic Li ion conductor, lithium phosphorus oxynitride (LiPON) thin film. In 1-butyl-1-methylpyrrolidinium (BMP+) and 1-ethyl-3-methylimidazolium (EMI+) bis(trifluoromethylsulfonyl)amide (TFSA–) containing 1 M LiTFSA, no cathodic current attributable to reductive decomposition of the ionic liquids was observed on the Ni electrode coated with LiPON thin film. Electrochemical deposition and dissolution of Li was confirmed to occur through LiPON thin film in both ionic liquids. Therefore, LiPON thin film acted as an artificial solid electrolyte interphase film, in which Li ion was transported between the ionic liquids and LiPON thin film.
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