Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effects of Co-solvent on Passivation Film of Lithium Surface

리튬 표면의 부동태 피막에 미치는 공용매의 영향

  • Kang, Jihoon (Department of Chemical Engineering, Soonchunhyang University) ;
  • Jeong, Soonki (Department of Chemical Engineering, Soonchunhyang University)
  • 강지훈 (순천향대학교 나노화학공학과) ;
  • 정순기 (순천향대학교 나노화학공학과)
  • Received : 2014.04.07
  • Accepted : 2014.06.30
  • Published : 2014.06.30
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Abstract

This study examined the morphological changes in lithium surface immersed in 1mol $dm^{-3}$ (M) $LiPF_6 $ dissolved 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 film formation reactions were significantly affected by the amount of co-solvent, DME, in electrolyte solution. A stable film was obtained from the 1 M $LiPF_6 $ / PC:DME (67:33) solution in which lithium electrode showed good electrochemical 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 metal and the resistance behavior of its passivation film.

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References

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