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中文摘要：
目前商业锂离子电池主要采用LiCoO2作正极材料，但由于价格和安全性等问题，LiCoO2已不能满足锂离子电池发展的需要．因此开发低成本和高性能的新型正极材料已成为目前锂离子电池研究领域的热点．Liu等首次报道了结构式为LiNi1-x-yCoxMnyO2的三元复合氧化物，该类材料因具有比容量高、成本低、对环境友好以及热稳定性和安全性好等优势而备受关注．
英文摘要：
Layered LiNi1/3Co1/3Mn1/3O2 as the cathode materials for lithium ion batteries was synthesized with the co-precipitated metal carbonate as the precursor. The effects of Ti-F co-substitution on the structure and electrochemical properties of LiNi1/3CO1/3Mn1/3O2 were studied by X-ray diffraction（XRD） , X-ray photoelectron spectroscopy（ XPS ）, electrochemical impedance spectroscopy （ EIS ） and galvanostatic charge-discharge experiments. Ti-F co-substitution leads to the change in the content of transition metal ions with a low valence, thereby induces an expansion in lattice volume. Furthermore, the increase of charge-transfer resistances during the cycling was suppressed by Ti-F co-substitution. The initial discharge capacity of substituted sample is 165.23 mA · h/g and the capacity retention rate is 94. 9% up to 20 cycles.
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