Abstract
The electrochemical behavior of Li x CoO 2 ( x>1.0) and its high pressure oxygen-treated samples were examined as cathode of lithium ion battery. Li x CoO 2 was prepared at nominal compositions of Li/Co=1.02, 1.05, 1.10, 1.15, 1.20, 1.25, and 1.30. The practical compositions and cobalt valences were analyzed by ICP and iodometric titration technique. X-ray diffraction patterns show that the lattice gradually contracts with increasing Li/Co ratio. The lattice contraction stops at Li/Co=1.15, which corresponds to the solid solution limit. The high oxygen pressure treatment reduced the number of oxygen defects and enlarged the interlayer distance. The electrochemical behavior of oxygen-treated samples show better cycling efficiency and less irreversible capacities. The reversible capacities show clear dependence on Li/Co ratio that the highest capacity of 140 mA h g −1 was obtained when Li/Co=1.10 and beyond that value it decreased linearly with Li/Co ratio.
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