以简单的球磨-干燥-煅烧法，制备了具有稳定α-NaFeO2型层状结构（R-3m空间群）的LiNi0.5Co0.2Mn0.3O2 型的三元正极材料。通过X射线衍射分析、傅里叶红外光谱、扫描电子显微镜、充放电循环、循环伏安、交流阻抗谱等手段测试了样品的理化性能。研究表明：球磨浆料的陈化温度对样品性能有明显的影响。在0.1C、1C、2C、3C、5C、6C、8C和10C倍率电流和连续充放电下，经过50 ℃陈化浆料制备的亚微米样品的放电容量分别为172.3、161.4、151.5、145.2、136.9、133.2、126.3、121.4 mA·h/g，表现出较好的大倍率电流放电性能。随着循环次数的增加，该样品的锂离子扩散系数和电荷传递阻抗均发生变化。该样品的未循环、充放电循环1次及循环40次样品的锂离子扩散速率分别为1.45×10-16、6.60×10-16、7.92×10-15 cm/s。

LiNi0.5Co0.2Mn0.3O2 cathode materials with a stable layered structure（α-NaFeO2，R-3m space group） prepared by using a simple ball milling drying calcination method.The physico chemical performance of the asprepared cathode materi als was characterized by means of X-ray diffraction analysis，Fourier transform infrared spectroscopy，scanning electron micro scopy，charge discharge cycle，cyclic voltammetry and electrochemical spectroscopy etc..The results showed that the aging temperature of the precursor obviously affected the electrochemical performance.Under the contitions of 0.1C，1C，2C，3C，5C，6C，8C and 10C rate currents and continuous charge and discharge，the sample prepared using the aging slurry at 50 ℃ havd a discharge capacities of 172.3，161.4，151.5， 145.2，136.9，133.2，126.3 and 121.4 mA·h/g，respectively，and showed a good largerate current discharge performance.As the number of cycles increases，both the Li+ diffusion coefficient and the charge transfer impedance of the sample were changed.The Li+ diffusion rates of the sample which under the conditions of no cycle，1 cycle and 40 cycles were 1.45×10-16，6.60×10-16 and 7.92×10-15 cm/s，respectively.