期刊
JOURNAL OF POWER SOURCES
卷 97-8, 期 -, 页码 303-307出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0378-7753(01)00515-8
关键词
sol-gel process; LiA1(y)Co(1-y)O(2); lithium rechargeable batteries; XANES
The structure and electrochemical properties of LiAlyCo1-yO2 cathodes for Li rechargeable batteries have been closely examined by neutron diffraction, X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), differential scanning calorimetry (DSC), and electrochemical methods. Neutron diffraction patterns and Co K-edge X-ray absorption near-edge structure (XANES) spectra of LiAl0.25Co0.75O2 revealed that aluminum and cobalt ions were statistically distributed in octahedral 3b sites of the ordered alpha -NaFeO2 structure. The DSC scan of Li0.5Al0.25Co0.75O2 showed an increase in the peak temperature and reduction in the exothermic peak compared to those of Li0.5CoO2, and it indicates that Al-doped LiCoO2 shows the good thermal stability of the cathode and reduction of the heat of reaction. (C) 2001 Elsevier Science B.V. All rights reserved.
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