Synthesis and Electrochemical Properties of HT-LiCo0.8Ni0.2O2 Prepared by Molten Salt Synthesis Method using 0.59LiNO3-0.41LiOH System

Chi-Hwan Han; Young-Sik Hong; Eun-Ju Kang; Jee-Sun Shin; Keon Kim

Korean Journal of Chemical Engineering, Vol.18, No.5, 765-769, September, 2001

Chi-Hwan Han , Young-Sik Hong, Eun-Ju Kang, Jee-Sun Shin, and Keon Kim^†

Division of Chemistry and Molecular Engineering, Department of Chemistry, Korea University, Seoul 136-701, Korea

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LiCo0.8Ni0.2O2 powders were prepared by molten salt synthesis method using a 0.59LiNO3-0.41LiOH melt. The physico-chemical properties of the LiCo0.8Ni0.2O2 powders were investigated by powder X-ray diffraction method, field emission scanning electron microscopy, cyclic voltammetry, and charge-discharge cycling. Uniform size nanocrystalline powder (~40 nm) could be obtained at temperature ranges of 280-480 ℃. These nanocrystalline powders showed poor electrochemical properties because of presence of the low temperature phase. Pure single-phase HT-LiCo0.8Ni0.2O2 powder could be obtained at 580 ℃. Charge-discharge measurements indicated that this exhibited a good capacity and cyclability without further heat treatment at higher temperatures.

Keywords:Molten Salt Synthesis;LiCo0.8Ni0.2O2;Lithium Battery

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