Synthesis of LiA1(y)Co(1-y)O(2) using acrylic acid and its electrochemicalproperties for Li rechargeable batteries

The structure and electrochemical properties of LiAlyCo1-yO2 cathodes for L i 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 diffracti on patterns and Co K-edge X-ray absorption near-edge structure (XANES) spec tra of LiAl0.25Co0.75O2 revealed that aluminum and cobalt ions were statist ically distributed in octahedral 3b sites of the ordered alpha -NaFeO2 stru cture. The DSC scan of Li0.5Al0.25Co0.75O2 showed an increase in the peak t emperature and reduction in the exothermic peak compared to those of Li0.5C oO2, 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 Sc ience B.V. All rights reserved.