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中文摘要：
富锂层状氧化物作为锂离子电池正极材料具有高比容量优势．采用草酸盐共沉淀法制备Li（Li0．22Ni0．17Mn0．61）O2，并用YR包覆电极．采用x射线衍射（XRD）、扫描电子显微镜（SEM）和X射线能谱分析（EDS）表征材料结构、观察材料形貌．结果表明，材料颗粒尺寸在100～200nm范围，YR包覆不会改变材料结构和形貌．电化学恒流充放电测试表明，YR包覆Li（Li0．22Ni0．17Mn0．61）O2电极的比容量，尤其倍率比容量明显提高．60mAh·g^-1电流密度下包覆电极材料30周循环后其比容量保持在220mAh·g^-1以上，1500mAh·g^-1电流密度下其比容量仍可达150mAh·g^-1,电化学阻抗谱（EIS）测试结果表明，YR包覆电极电荷转移电阻和扩散阻抗均明显降低，有利于电化学性能改善．
英文摘要：
The Li（Li0 22 Ni0.17 Mn0. 61 ）O2 was prepared with oxalic co-precipitation and coated with an YF3 layer by a chemical deposition method. The as-prepared and YF3-coated Li-rich materials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy-dispersive X-ray spectroscopy （EDS）. The results demonstrate that the as-prepared and YF3-coated Li（ Li0.22Ni0 17Mn0.61 ）O2 materials have a typical layered structure and are composed of sphere-like particles with a diameter of 100-200 nm. Gal-vanostatic charge-discharge tests show that the discharge capacity of the YF3-coated Li （ Lio. 22 Nio. 17 Mno 6l ） 02 is obviously improved. At the low current density of 60 mAh·g^-1, the discharge capacity reaches 240 mAh·g^-1, and remains 220 mAh·g^-1 after 30 cycles. At the high current density of 1500 mAh·g^-1, the discharge capaci-ty still keeps 150 mAh·g^-1, showing an excellent high-rate capability. Electrochemical impedance spectra （EIS） reveal that the YF3-coated Li （Li0.22 Ni0. 17 Mn0.6l ）O2 shows lower charge-transfer resistance and diffu-sion impedance as compared with the as-prepared Li（ Li0.22Ni0.17Mn0. 61 ）O2.
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