锂离子电池用正极材料Li_xCo_(0.8)Ni_(0.2)O_2

Cathode Materials of Li_xCo_(0.8)Ni_(0.2)O_2 for Lithium-ion Battery

在控制结晶工艺合成Co0 .8Ni0 .2 (OH) 2 的基础上制备了锂离子电池正极材料LixCo0 .8Ni0 .2 O2 。能量散射谱分析结果表明活性材料中Co、Ni元素分布均匀。由于在控制结晶合成的前驱体Co0 .8Ni0 .2 (OH) 2 中 ,Co、Ni均匀分布在M (OH) 2 中的M层 ,因此可以避免形成一般固溶体发生扩散性重组所需长时间的煅烧过程。扫描电子显微镜分析了表微观形貌的变化。X光衍射分析表明LixCo0 .8Ni0 .2 O2 为单一相的α -NaFeO2 层状结构 ,不存在其它杂相 ;晶胞参数a和c随x变化经历了由小到大再变小的过程 ;c/a则经历了一个由大到小再变大的过程。

Li x Co 0.8 Ni 0.2 O 2, as the cathode materials for lithium-ion battery, were prepared from the precursors, Co 0.8 Ni 0.2 (OH) 2, which were synthesized by the controlled crystallization technology. The experiments of energy diffraction spectroscopy showed that the elements of Co and Ni were distributed uniformly in the active materials. Because the elements of Co and Ni have been distributed uniformly in the M layer of M(OH) 2 during the controlled crystallization process, the long-term calcining process was avoided, when the recomposing process of diffusion happened in the common solid solutions. The microphotographs of SEM indicated the change of microcosmic morphology. The results of XRD proved that the Li x Co 0.8 Ni 0.2 O 2 were single phase with α-NaFeO 2 layered structure, and have no other phases. The crystal lattices of a and c underwent a process from small to big and then to small, and c/a underwent a process from big to small and then to big.