Abstract
The surface of commercial LiCoO 2 was modified by molten salt method. The structure and electrochemical and thermal performances of the MgCl 2-treated LiCoO 2 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy and galvanostatic cycling. It is found that surface modification improves the structural and thermal stability as well as the rate performance of LiCoO 2. These improvements were attributed to the formation of homogeneous solid solution on the surface of the LiCoO 2 particle.
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