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LiCoO2 is the first commercialized cathode material in lithium ion batteries, and has been considered as one of the most attractive cathode materials due to its superior cycle stability, excellent reversibility,high energy density and ease of preparation [1].Recently, numerous researches have been focused on achieving higher capacity by charging the cell beyond 4.3 V, but it leads to structural damage and severe capacity decay of the cathodes [2].Many efforts have been made to overcome these drawbacks and improve the electrochemical performance of LiCoO2 at high voltages.One of the useful strategies is partial substitution of Co by other metallic elements in LiCoO2 [3].