Improved electrode performance of LiAlyCo1-yO2 prepared via sol-gel process

A significant improvement in capacity and cyclability of Al-doped LiCoO2 ca thode has been achieved by sol-gel process using acrylic acid as a chelatin g agent. The structure and electrochemical properties of the Al-doped LiCoO 2 powders at various calcination temperatures were investigated. The X-ray diffraction pattern for the Al-doped LiCoO2 powders calcined at 600 degrees C or above shows that these materials are a well-developed, layered HT-LiCo O2 structure. The capacity fading of the Al-doped LiCoO2 electrodes greatly reduced as the calcination temperature decreased. The sol-gel process make s possible the synthesis of Al-doped LiCoO2 with alpha -NaFeO2 structure at lower temperatures than solid-state synthesis, and thereby the enhancement of the capacity and cyclability of Al-doped LiCoO2 electrode. (C) 2001 The Electrochemical Society.