中文摘要：

采用水热法以及后退火处理合成了锂离子电池正极材料Lix/3＋1Ni1/2-x/2-y/2Mnx/6＋1/2-y/2CryO2（0≤x≤1,0≤y〈0.4,x＋y≤1）。通过X射线衍射（XRD）、扫描电镜（SEM）、X射线光电子能谱分析（XPS）以及恒电流充放电测试,研究了复合材料的晶体结构、形貌以及电化学性能,并考察了不同原料配比对材料电化学性能的影响。实验结果表明,制得的Lix/3＋1-Ni1/2-x/2-y/2Mnx/6＋1/2-y/2CryO2正极材料结晶度高,粒度分布均匀。其中,样品Li1.1833Ni0.2Mn0.5667Cr0.05O2的首次充放电比容量最高,分别为153.5 mAh/g和213.8 mAh/g[电压范围为2.0～5.0 V（vs.Li＋/Li）,充放电倍率为0.2 C];样品Li1.2Ni0.2-Mn0.6O2则体现出优异的循环稳定性。

英文摘要：

The multiple doping Li-ion battery cathode materials Lix/3＋1Ni1/2-x/2-y/2Mnx/6＋1/2-y/2CryO2（0≤x≤1,0≤y0.4,x＋y≤1） were synthesized by hydrothermal and solid state reaction.The crystal structure,morphology and electrochemical characteristics of composite material were characterized by XRD,SEM,XPS and galvanostatic charge-discharge test.The results show that the prepared samples have high crystallinity and uniform size distribution.At room temperature,the test was carried out in a voltage range from 2.0 to 5.0 V at 0.2 C rate,the sample Li1.183 3Ni0.2Mn0.566 7Cr0.05O2 has the best electrochemical performance and the initial charge and discharge specific capacity is 153.5 mAh/g and 213.8 mAh/g,respectively.In addition,the sample Li1.2Ni0.2Mn0.6O2 shows excellent cycle stability with little or no capacity loss after 30 cycles.