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报道了在 80 0℃烧结制备的新型锂二次电池正极材料Li(AlyCo1-y)O2 (y =0 ,0 .11)的X射线衍射结果和由此而揭示的结构演化过程 .研究表明 ,y≤ 0 .5时 ,材料呈单相 ,0 .6≤ y≤ 0 .9时 ,材料呈两相[Li(AlyCo1-y)O2 ,γ LiAlO2 ]共存状态 ,y =1时 ,材料又呈单相 ,为γ LiAlO2 相 .Li(AlyCo1-y)O2 材料中y值 的上限即Al的最大固溶度在 0 .5左右 .在单相区 (y≤ 0 .5 ) ,随着Al掺杂的增多 ,Li(AlyCo1-y)O2 材料晶格结构参数发生变化 ,a轴缩短 ,c轴变长 ,c/a比基本呈线性增加 ,材料的层状属性更加明显 .
The X-ray diffraction results of Li (AlyCo1-y) O2 (y = 0, 0.11), a new type of lithium secondary battery cathode material prepared by sintering at 80 ℃, have been reported and the structural evolutions have been reported. In the case of y≤0.5, the material is single phase, and when 0 .6≤y≤0.9, the material is in the coexistence of two phases [Li (AlyCo1-y) O2, γLiAlO2] Single phase, the γ LiAlO2 phase.Li (AlyCo1-y) O2 material y value of the upper limit of the maximum solubility of Al is about 0.5 in the single-phase region (y ≤ 0.5), with the Al-doped The lattice parameters of Li (AlyCo1-y) O2 change with the increase of miscibility. The a-axis decreases, the c-axis grows longer and the ratio of c / a increases linearly. The layered property of the material is more obvious.