| 氧化钛包覆对LiCo0.2Ni0.4Mn0.4O2结构和性能的影响 |
| Effect of TiO2-coating on the Structure and Electrochemical Performance of LiCo0.2Ni0.4Mn0.4O2 |
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| 摘要: 采用SEM、 XRD、 XPS、恒电流充放电等方法研究了不同量的氧化钛包覆对LiCo0.2Ni0.4Mn0.4O2结构和电化学性能的影响。结果表明，0.3mol%氧化钛包覆能显著改善LiCo0.2Ni0.4Mn0.4O2的循环性能、倍率放电能力及高截止电压(3.0～4.5 V)下的循环性。XPS数据表明氧化钛包覆能明显的抑制样品表面的氧化活性，从而减少了电极材料表面与电解液的反应，改善了LiCo0.2Ni0.4Mn0.4O2的电化学性能。 |
| 关键词: LiCo0.2Ni0.4Mn0.4O2 氧化钛包覆 电化学性能 锂离子电池 |
| 基金项目: |
| Abstract: LiCo0.2Ni0.4Mn0.4O2 as cathode material for lithium ion batteries was modified by TiO2-coating. The effect of TiO2-coating on the structure and electrochemical performance of LiCo0.2Ni0.4Mn0.4O2 was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and galvanostatic charge-discharge tests. The results suggest that a small amount TiO2-coating does not change the crystalline structure but considerably improves the electrochemical performance of LiCo0.2Ni0.4Mn0.4O2 in terms of capacity delivery and cyclability. XPS results confirm that the improved electrochemical performance is most possibly attributed to the decrease of the interaction between layered material and nonaqueous electrolyte during the charge-discharge processes. |
| Keywords: LiCo0.2Ni0.4Mn0.4O2 TiO2-coating electrochemical performance lithium ion batteries |
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| 杨箫,黄友元,周恒辉,陈继涛,张新祥.氧化钛包覆对LiCo0.2Ni0.4Mn0.4O2结构和性能的影响[J].无机化学学报,2007,23(5):753-758. |
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