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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 9
BKCSDE 29(9)
September 20, 2008

Title	Organic Solvents Containing Zwitterion as Electrolyte for Li Ion Cells
Author	Jegatha Nambi Krishnan, Hyung Sun Kim*, Jae Kyun Lee, Byung Won Cho, Eun Joo Roh, Sang Gi Lee
Keywords	Imidazolium based zwitterion additives, Li-ion cell, Liquid electrolyte
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 LiCoO₂ cathode. The use of 10 wt% of DMIm-3S in 1 M LiPF₆, 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 °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 LiCoO₂ electrode before and after 300 cycles was studied by scanning electron microscopy. An analogous study was performed using liquid electrolyte without any additive.
Page	1705 - 1710
Full Text	PDF

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