Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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The Corrosion Study of Al Current Collector in Phosphonium Ionic Liquid as Solvent for Lithium Ion Battery

  • Cha, Eun-Hee (Graduated School of Green Energy Engineering, Hoseo Univ.) ;
  • Mun, Jun-Young (Department of Chemical Biological Engineering & WCU Program of C2E2, Seoul National Univ.) ;
  • Cho, E.-Rang (Department of Chemical Biological Engineering & WCU Program of C2E2, Seoul National Univ.) ;
  • Yim, Tae-Eun (Department of Chemical Biological Engineering & WCU Program of C2E2, Seoul National Univ.) ;
  • Kim, Young-Gyu (Department of Chemical Biological Engineering & WCU Program of C2E2, Seoul National Univ.) ;
  • Oh, Seung-M. (Department of Chemical Biological Engineering & WCU Program of C2E2, Seoul National Univ.) ;
  • Lim, Soo-A (AIBN of Quennsland Univ.) ;
  • Lim, Jea-Wook (POSCO ICT SW Convergence Technology)
  • Received : 2011.07.29
  • Accepted : 2011.08.26
  • Published : 2011.08.31
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Abstract

A room temperature ionic liquid (RTIL) based on trihexyl (tetradecyl)phosphonium bis(trifluoromethanesulfonyl) imide ([$(C_6H_{13})_3P(C_{14}H_{29)}$] [TFSI];P66614TFSI) was synthesized and analyzed to determine their characteristics and properties. The bis(trifluoromethanesulfonyl)imide (TFSI) anion is widely studied as an ionic liquid (IL) forming anion which imparts many useful properties, notably electrochemical stability. Especially its electrochemical and physical characteristics for solvent of lithium ion battery were investigated in detail. $P_{66614}$ TFSI exhibits fairly low conductivity (0.89 mS $cm^{-1}$) and higher viscosity (298 K: 277 cP; 343 K: 39 cP) than other ionic liquids, but it exhibits a high thermal stability (over $400^{\circ}C$). Especially corrosion behavior on Al current collector was tested at room temperature and further it was confirmed that thermal resistivity for Al corrosion was highly increased in 1.0M LiTFSI/$P_{66614}$-TFSI electrolyte comparing with other RTILs by linear sweep thermometry.

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References

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