Suppression of Aluminum Corrosion in Lithium Bis(trifluoromethanesulfonyl)imide-based Electrolytes by the Addition of Fumed Silica

  • Louis, Hamenu (Department of Applied Chemistry and Biotechnology, Hanbat National University) ;
  • Lee, Young-Gi (Research Section of Power Control Devices, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Kim, Kwang Man (Research Section of Power Control Devices, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Cho, Won Il (Energy Storage Research Center, Korea Institute of Science and Technology) ;
  • Ko, Jang Myoun (Department of Applied Chemistry and Biotechnology, Hanbat National University)
  • Received : 2013.02.22
  • Accepted : 2013.03.23
  • Published : 2013.06.20


The corrosion property of aluminum by lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt is investigated in liquid and gel electrolytes consisting of ethylene carbonate/propylene carbonate/ethylmethyl carbonate/diethyl carbonate (20:5:55:20, vol %) with vinylene carbonate (2 wt %) and fluoroethylene carbonate (5 wt %) using conductivity measurement, cyclic voltammetry, scanning electron microscopy, and energy dispersive X-ray spectroscopy. All corrosion behaviors are attenuated remarkably by using three gel electrolytes containing 3 wt % of hydrophilic and hydrophobic fumed silica. The addition of silica particles contributes to the increase in the ionic conductivity of the electrolyte, indicating temporarily formed physical crosslinking among the silica particles to produce a gel state. Cyclic voltammetry also gives lower anodic current responses at higher potentials for repeating cycles, confirming further corrosion attenuation or electrochemical stability. In addition, the degree of corrosion attenuation can be affected mainly by the electrolytic constituents, not by the hydrophilicity or hydrophobicity of silica particles.


Supported by : Ministry of Education, Science and Technology


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