中文摘要：

分别采用硝酸铝[Al（NO3）3]、异丙醇铝（C9H21AlO3）及纳米氧化铝（nano-Al2O3）为原料,通过不同方法对富锂层状氧化物正极材料Li1.15Ni0.17Co0.11Mn0.57O2进行包覆改性,研究了不同铝源为原材料进行Al2O3包覆对Li1.15Ni0.17Co0.11Mn0.57O2的结构和电化学性能的影响。采用X射线衍射光谱法（XRD）、扫描电子显微镜法（SEM）及电化学测试等方法来表征包覆前后Li1.15Ni0.17Co0.11Mn0.57O2材料的表面形貌和电化学性能。研究结果表明,Al（NO3）3为铝源的包覆提高了电池的首次比容量、循环性能及倍率性能,以C9H21AlO3为铝源的包覆层对电池的循环性能有比较好的提升。

英文摘要：

Al2O3-coated Li1.15Ni0.17Co0.11Mn0.57O2 lithium-rich layered cathode materials were prepared by different methods with alumina sources of aluminium nitrate （Al（NO3）3）, aluminium isopropoxide （C9H21AlO3） and nano-alumina （nano-Al2O3）, respectively and the effect of coating cathode materials with different alumina sources on the structure and electrochemical performance of Li1.15Ni0.17Co0.11Mn0.57O2 were compared. The pristine material and Al2O3--coated Li1.15Ni0.17Co0.11Mn0.57O2 were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical test. The result shows that AI （NO3）3 as raw material to coat Al2O3 on the cathode material can improve the specific capacity, cycle performance and rate performance,while the Al2O3 coating layer formed from C9H21AlO3 can enhance the cycle performance.