高振实密度富锂正极材料Li[Li_(0.133)Ni_(0.300)Mn_(0.567)]O_2的制备和表征

Preparation and characterization of high tap density cathode material Li[Li_(0.133)Ni_(0.300)Mn_(0.567)]O_2 for Li-ion battery

采用羟基共沉淀法与熔盐法相结合的方式制备了具有高振实密度、高容量的锂离子电池正极材料Li[Li0133Ni0.300Mn0.567]O2,通过X射线衍射仪（XRD）、扫描电子显微镜（SEM）和振实密度仪分别对材料的结构、形貌和振实密度进行了分析.XRD结果表明材料属α-NaFeO2型层状结构;SEM结果显示材料平均颗粒尺寸为600 nm,且颗粒之间分散比较均匀,无明显的团聚现象;材料的振实密度为2.1 g/cm3,相对于传统方法所制备的材料有较大提高.电化学测试结果表明材料在2.0～4.6 V电压区间、20～100 mA/g的较大电流密度变化幅度下依然保持着良好的电化学性能,且经过30次循环后容量衰减较小.

Hydroxyl precipitation and molten salt method were combined to prepare a cathode material Li[Li0.133Ni0.300Mn0.567]O2 with high tap density. The structure, morphology and tap density of the material were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and tap density instrument（TDI）. The X-ray diffraction results show that the material is lamellar cc-NaFeOt; SEM images reveal that the average particle size of material is 600 nm. The particles were dispersed relatively uniform and had no obvious aggregation phenomenon. The tap density was 2.1 g/cm^3, it was greatly improved compared with matedats prepared by traditional methods. The electrochemical test results show that better electrochemical property can be kept by the material under large current density changed between 20-100 mA/g. After 30 cycles, the capacity was attenuated smaller between 2.0-4.6 V.