Journal
JOURNAL OF POWER SOURCES
Volume 132, Issue 1-2, Pages 187-194Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2004.01.035
Keywords
lithium cobalt oxide; cellular phone; modification plateau efficiency; oxidation state
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As the cathode materials for rechargeable lithium batteries, five commercial lithium cobalt oxide powders have been investigated for a comparative study. The X-ray diffraction analysis indicates that all these powders exhibit the alpha-NaFeO2 layered structure. The size distribution and morphology were analyzed by particle sedimentation method and scanning electron microscopy (SEM). Their electrochemical properties including cycleability and especially 3.6 V plateau efficiency, a recently required control parameter, are compared. Two kinds of modifications, i.e. Li2CO3 coating and high-temperature treatment, have been applied to improve the electrochemical performance of one of these five powders. After the high-temperature treatment in air, cobalt oxidation-state becomes higher and Li(LixCo1-x)O-2 is formed. Both of the two modified means can significantly improve the 3.6 V-plateau efficiency through suppressing the cell impedance rise during cycling. A general discussion on the factors influencing the plateau efficiency is also given. (C) 2004 Published by Elsevier B.V.
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