Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Organic Solvents Containing Zwitterion as Electrolyte for Li Ion Cells

  • Krishnan, Jegatha Nambi (Medicinal Chemistry Research Center, Life Science Division, Korea Institute of Science and Technology (KIST)) ;
  • Kim, Hyung-Sun (Battery Research Center, Energy and Environment Division, Korea Institute of Science and Technology (KIST)) ;
  • Lee, Jae-Kyun (Medicinal Chemistry Research Center, Life Science Division, Korea Institute of Science and Technology (KIST)) ;
  • Cho, Byung-Won (Battery Research Center, Energy and Environment Division, Korea Institute of Science and Technology (KIST)) ;
  • Roh, Eun-Joo (Medicinal Chemistry Research Center, Life Science Division, Korea Institute of Science and Technology (KIST)) ;
  • Lee, Sang-Gi (Medicinal Chemistry Research Center, Life Science Division, Korea Institute of Science and Technology (KIST))
  • Published : 2008.09.30
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Abstract

Imidazolium based zwitterions, 1,2-dimethylimidazolium-3-n-propanesulfonate (DMIm-3S) and 1-Butylimidazolium-3-n-butanesulphonate (BIm-4S), were synthesized, and utilized them as additive for Li ion cell comprising of graphite anode and $LiCoO_2$ cathode. The use of 10 wt% of DMIm-3S in 1 M $LiPF_6$, EC-EMCDMC (1:1:1 (v/v)) resulted in the increased high rate charge-discharge performance. The low temperature performance of the Li ion cells at about −20 ${^{\circ}C}$ was also enhanced by these zwitterion additives. The DMIm- 3S additive resulted in the better capacity retention by the Li-ion cells even after 120 cycles with 100% depth of discharge (DOD) at 1 C rate in room temperature. Surface morphology of both graphite and $LiCoO_2$ electrode before and after 300 cycles was studied by scanning electron microscopy. An analogous study was performed using liquid electrolyte without any additive.

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