期刊
SOLID STATE IONICS
卷 151, 期 1-4, 页码 259-263出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(02)00721-X
关键词
LiCoO2; lithium batteries; hydrothermal synthesis
Ultrafine powders of LiCoO2 were prepared under mild hydrothermal conditions. Reactant mixtures of aqueous solutions of cobalt (II) nitrate, lithium hydroxide and hydrogen peroxide with different Co/Li and Co/H2O2 ratios were hydrothermally treated at 150-250 degreesC for 0.5-24 h in a Teflon-lined autoclave. Only HT-LiCoO2 phase. was observed by X-ray diffraction (XRD) analysis. Scanning (SEM) and transmission (TEM) electron microscopies revealed the formation of well-crystallized hexagonal platelike particles with average size 70-200 nm. The increase in LiOH concentration results in better crystallinity. Annealing of hydrothermally prepared LiCoO2 at 230 degreesC leads to decreasing initial capacity from 130 down to 120 mA h/g, but improves cyclability (fade rate drops from 3.1 to 1.6 mA h/g per cycle). Submicrometric particle size and high surface area results in good electrochemical properties for high discharge rate. (C) 2002 Elsevier Science B.V. All rights reserved.
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