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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 18, Number 1
BKCSDE 18(1)
January 20, 1997 

Electrochemical Properties of LixCoyNi1-yO2 Prepared by Citrate Sol-Gel Method
Soon Ho Chang, Seong-Gu Kang, Kee Ho Jang
The electrochemical properties of LixCoyNi1-yO2 compounds (y=0.1, 0.3, 0.5, 0.7, 1.0) prepared by citrate sol-gel method have been investigated. The LixCoyNi1-yO2 compounds were annealed at 850 ℃ for 20 h after preheating at 650 ℃ for 6 h, in air. The x-ray diffraction (XRD) patterns for LixCoyNi1-yO2 have shown that these compounds have a well developed layered structure (R m). From the scanning electron microscopy of LixCoyNi1-yO2, particle size was estimated less than 5 μm. The Li//LixCoyNi1-yO2 electrochemical cell consists of Li metal anode and 1 M LiClO4-propylene carbonate (PC) solution as the electrolyte. The differences in intercalation rate of the LixCoyNi1-yO2 in the first charge/discharge cycle were less than 0.05 e-. The first discharge capacities of LixCoO2 and LixCo0.3Ni0.7O2 were ∼ 130 mAh/g and ∼160 mAh/g, respectively.
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