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Articles by Nam-Soon Choi
Total Records ( 2 ) for Nam-Soon Choi
  Irina A. Profatilova , Nam-Soon Choi , Sae Weon Roh and Sung Soo Kim

The electrochemical and thermal properties of graphite electrodes with electrolytes containing 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) and N-methyl,N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (MPPpTFSI) ionic liquids are investigated. The ionic liquids undergo extensive reductive decomposition on a graphite electrode during the first charge. The effect of a fluoroethylene carbonate (FEC) additive on the reductive decomposition of the ionic liquids is examined by electrochemical, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis. Thermal reactions between a lithiated graphite electrode and an ionic liquid-containing electrolyte are investigated with differential scanning calorimetry (DSC). The introduction of an ionic liquid can effectively reduce the exothermic heat evolution from the thermal reactions between a lithiated graphite electrode and an electrolyte.

  Nam-Soon Choi , Joon-Sup Kim , Ri-Zhu Yin and Sung-Soo Kim
  Li1.1V0.9O2 with a layered structure has been synthesized by a solid-state reaction of Li2CO3 and V2O3. The microstructure and morphology of the Li1.1V0.9O2 are characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical reversibility of Li1.1V0.9O2 electrode is examined at various charged and discharged states by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR). The considerable improvement of the electrochemical performance of Li1.1V0.9O2 electrode is observed by changing the discharge cut-off potential from 1.0 to 2.0 V vs. Li/Li+.
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