论文部分内容阅读
LiCo0.2Ni0.4Mn0.4O2, as the cathode materia for lithium ion batteries, was modified by TiO2-coatingThe effect of TiO2-coating on the structure and electro-chemical performance of LiCo0.2Ni0.4Mn0.4O2 was char-acterized 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 doesnot change the crystalline structure, but considerably improves the electrochemical performance of LiCo0.2Ni0.4Mn0.4O2 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.