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以[Ni1/3Co1/3Mn1/3]3O4和氢氧化锂为原料,分别采用球磨法和液相法前处理工艺制备层状正极材料Li[Ni1/3Mn1/3Co1/3]O2。采用X?射线衍射(XRD)、场发射扫描电镜(FESEM)、恒流充放电等手段对材料的物理和电化学性能进行表征。结果表明:采用不同前处理工艺制备出的Li[Ni1/3Mn1/3Co1/3]O2材料在结构、形貌和电化学性能上有较大差异;与球磨处理法制备的材料相比,采用液相法前处理工艺制备的Li[Ni1/3Mn1/3Co1/3]O2不但保持了前驱体较好的球形形貌,同时还具有较好的循环稳定性和倍率性能;该样品在20mA/g电流密度下,首次放电容量为178mA·h/g,50次循环后,容量保持率达98.7%;在1000mA/g电流密度下,样品容量为135mA·h/g。
Layered cathode material Li [Ni1 / 3Mn1 / 3Co1 / 3] O2 was prepared by ball milling and liquid phase pretreatment using [Ni1 / 3Co1 / 3Mn1 / 3] 3O4 and lithium hydroxide as raw materials. The physical and electrochemical properties of the materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and constant current charge-discharge method. The results show that Li [Ni1 / 3Mn1 / 3Co1 / 3] O2 prepared by different pretreatment processes has great differences in structure, morphology and electrochemical performance. Compared with the materials prepared by ball milling, The Li [Ni1 / 3Mn1 / 3Co1 / 3] O2 prepared by the phase preparation process not only retained the better spherical morphology of the precursor, but also had better cycling stability and rate performance. The sample was stable at 20mA / g The first discharge capacity was 178mA · h / g at a density of 98.7% after 50 cycles. The sample capacity was 135mA · h / g at a current density of 1000mA / g.