高密度锂离子电池正极材料前驱体Ni_1/3Co_1/3Mn_1/3OOH的制备

Preparation of Ni_(1/3)Co_(1/3)Mn_(1/3)OOH of High Tamping Density as the Precursor of Cathode Materials for Lithium Ion Battery

采用二次干燥的化学共沉积法制备出了振实密度β-Ni1/3Co1/3Mn1/3OOH作为锂离子电池正极材料的前驱体。研究了反应物浓度、聚沉剂、烘干方式和加料方式等对产物晶体结构和振实密度的影响,得到了制备高密度锂离子电池正极材料前躯体的最佳条件。X射线衍射分析表明:制备的Ni1/3Co1/3Mn1/3OOH为β型六方层状结构,粒子细小,局部存在大量的晶格缺陷,反应活性较高。以此为前驱体制备的锂离子电池正极材料Li(Ni1/3Co1/3Mn1/3)O2振实密度为2.67g/cm3,晶体结构属于六方晶系,与α-NaFeO2结构类似,(003)/(104)峰强比值高达2.2,(108)峰和(110)峰分开明显,表明该前驱体制备的正极材料层状结构发育好,振实密度高,预示着优良的电化学活性和高的体积比容量。

Ni1/3Co1/3Mn1/3OOH powders as the precursor of cathode materials for Lithium ion battery with high tamping density have been prepared by a 2 steps drying method. The effects of reaction concentration and temperature, feeding and drying methods on the crystal structure and the tamping density of samples are investigated, and the optimum conditions for preparing Ni1/3Co1/3Mn1/3OOH with high density have been obtained. The XRD results show that the prepared Ni1/3Co1/3Mn1/3OOH precursor has a β-type hexagonal layered structure with a high chemical reaction activity because of the small dimensions and a lot of lattice defects in it. The Li Ni1/3Co1/3Mn1/3O2 for the cathode materials of lithium ion battery with tamping density of 2.65 g·cm^-3 has been synthesized with the prepared precursor, which belongs to a hexagonal system, similar to the α-NaFeO2 structure. The intensity ratio of （003） to （104） lines is as high as 2.2 and the （108） and （110） lines split clearly according to the XRD patterns. The cathode materials synthesized using Ni1/3Co1/3Mn1/3OOH of high density as precursor by the 2-steps drying method have well-defined layered structure and high tamping density, showing excellent electrochemical performance and high specific capacity.