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中文摘要：
通过在硝酸钇水溶液浸渍并焙烧的简单工艺,在LiCo1/3Ni1/3Mn1/3O2材料表面包覆了一层Y2O3.采用X射线衍射（XRD）,扫描电子显微镜（SEM）,透射电子显微镜（TEM）,循环伏安（CV）和恒流充放电对包覆和未包覆的LiCo1/3Ni1/3Mn1/3O2进行了测试分析.结果表明,Y2O3包覆并没有改变LiCo1/3Ni1/3Mn1/3O2的晶体结构,只存在于LiCo1/3Ni1/3Mn1/3O2的表面;与未包覆的材料相比,Y2O3包覆后的材料在高电位下具有更好的容量保持率和放电容量.CV测试表明,包覆层的存在有效抑制了材料层状结构的转变及电极与电解液的负反应.
英文摘要：
LiCo1/3Ni1/3Mn1/3O2 was coated by a layer of Y2O3 via a simple method. The bared sample was immersed into Y（NO3）3·6H2O solution and then calcined at a certain temperature to get the coated material. The coated and bared LiCo1/3Ni1/3Mn1/3O2 meterials were characterized by X-ray diffraction （XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, cyclic voltammetly （CV）, and galvanotactic charge-discharge test. It was showed that Y2O3 existed only on the surface, and had no effect on the crystal structure; theLiCo1/3Ni1/3Mn1/3O2 coated with Y2O3 exhibited better capacity retention than the bared LiCo1/3Ni1/3Mn1/3O2 in the higher cutoff voltage and had higher thermal stability. CV results suggested that the Y2O3 coating suppressed the phase transitions and prevented the surface of cathode materials from direct contact with the electrolyte.
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