Effect of TiO-coating on structure and electrochemical performance of LiCoNiMnO

Abstract

LiCo_0.2Ni_0.4Mn_0.4O₂, as the cathode material for lithium ion batteries, was modified by TiO₂-coating. The effect of TiO₂-coating on the structure and electrochemical performance of LiCo_0.2Ni_0.4Mn_0.4O₂ was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and galvanostatic charge-discharge tests. The results suggest that a small amount of TiO₂-coating does not change the crystalline structure, but considerably improves the electrochemical performance of LiCo_0.2Ni_0.4Mn_0.4O₂ in terms of capacity delivery and cyclability. XPS measurements confirm that the improved electrochemical performance is most possibly attributed to a decrease in interaction between the layered material and non-aqueous electrolyte during the charge-discharge processes.

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