Synthesis and electrochemical performance of doped LiCoO<inf>2</inf>materials

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Journal Article
Journal of Power Sources, 2007, 174 (2), pp. 828 - 831
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Layered intercalation compounds LiM0.02Co0.98O2(M = Mo6+, V5+, Zr4+) have been prepared using a simple solid-state method. Morphological and structural characterization of the synthesized powders is reported along with their electrochemical performance when used as the active material in a lithium half-cell. Synchrotron X-ray diffraction patterns suggest a single phase HT-LiCoO2that is isostructural to α-NaFeO2cannot be formed by aliovalent doping with Mo, V, and Zr. Scanning electron images show that particles are well-crystallized with a size distribution in the range of 1-5 μm. Charge-discharge cycling of the cells indicated first cycle irreversible capacity loss in order of increasing magnitude was Zr (15 mAh g-1), Mo (22 mAh g-1), and V (45 mAh g-1). Prolonged cycling the Mo-doped cell produced the best performance of all dopants with a stable reversible capacity of 120 mAh g-1after 30 cycles, but was inferior to that of pure LiCoO2. © 2007.
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