摘要
采用共沉淀法先合成出氢氧化物前驱体Ni0.85-xCo0.15Mnx(OH)2,其中X=0、0.1、0.2和0.4,前驱体与Li2CO3在空气气氛中固相烧结制得正极材料LiNi0.85-xCo0.15MnxO2。用XRD、SEM研究了锰含量对材料结构和形貌的影响。研究发现,LiNi0.85Co0.15O2的X射线衍射图中存在微量第二相,而锰掺杂有利于减小反应过程中锂离子损失和镍离子占据锂位,容易形成有序层状结构材料。随着Mn离子替代Ni离子量的增加,晶胞参数a减小,晶胞参数c、c/a及I003/I104值增大。SEM结果表明前驱体和最终产物形貌均随锰含量增加颗粒均匀性增强,粒子尺寸变小,粒径分布变窄。
The metal hydroxide LiNi（0.85-x）Co0.15MnxO2（OH）2precursors with x=0, 0. 1, 0.2 and 0.4 were prepared by the co-precipitation method. LiNi（0.85-x）Co0.15MnxO2 cathode materials were synthesized by mixing LiNi（0.85-x）Co0.15Mnx （OH）2 with Li2 COa via the solid-state reaction followed by heating in air. The effect of Mn content on the structure and morphology of LiNi（0.85-x）Co0.15MnxO2 cathode materials were analyzed by XRD and SEM. X-ray diffraction pattern of LiNi（0.85-x）Co0.15MnxO2 exists in little impure phase. With the Mn-doped increases, lithium loss and departure from stoichiometry are decreased, so, single phase and ordered layered materials are formed easily. With the amount increase of Mn content substituted for Ni content, the lattice parameter a exhibits a shrunken trend, the lattice parameter c and the ratio of peak intensities of I003/I104 and c/a increase. SEM micrographs of the precursors and the final product reveal that increasing Mn content not only decreases the particle size, but also narrows the particle size distribution .
出处
《山东科技大学学报（自然科学版）》
CAS
2007年第3期68-72,共5页
Journal of Shandong University of Science and Technology(Natural Science)
基金
青岛市自然科学基金项目(04-2-JZ-102)
