摘要
本文采用离子交换法分别制备了双复合锂锰氧化物Li0.60犤MgxMn1-x犦O2(0.05≤x≤0.15)和三复合锂锰氧化物Li0.60犤MgxCoyMn1-x-y犦O2(x=0.05,0.05≤y≤0.20),采用X-射线衍射(XRD)表征其晶体结构。着重研究了以下条件对晶体结构的影响:(1)复合金属氧化物与Na2CO3化学计量比(前驱体制备);(2)Mg元素添加量(双复合体系);(3)Co元素添加量(三复合体系)。采用扫描电子显微镜(SEM)观察产物的晶体形貌,呈现为不规则片状和棒状结构,粒径尺寸分布比较均匀。
Precursors of the type Na-0.60[MgxCOyMn1 - x - y]O-2 were prepared by solid state reaction of Na2CO3 and the composite metal oxides, then the layered materials of Li-0.60[MgxCoyMn1 - x - y]O-2 were obtained by ion-exchange. It was shown by XRD that both the stoichiometric ratio of Na2CO3 to the composite metal oxides and the dopant content have strong influences on the structures of the precursors. In the case of Mg dopant, the structure of Na-0.60 [MgxMn1 - x]O-2 was affected by the Mg content. Layered P2 structure was obtained when x = 0. 05, while both P2 and orthorhombic structures were obtained when x greater than or equal to 0. 10. For the compounds of Na-0.60[Mg(x)Co(y)Mn1 - x - y]O-2 ( x = 0. 05, 0. 05 less than or equal to y less than or equal to 0. 20), which have two metal dopants, the Co content has different effects on the structure. Both P2 and P3 layered structures were generated with low content of Co ( y = 0. 05). With the increase of Co content, the intensity of the diffraction peaks of P3 structure decreased, while those of P2 increased. Pure P2 structure was obtained at y = 0.20. SEM studies showed that the materials of Li-0.60[ MgxCoyMn1 - x - y]O-2 possess plate or bar-like morphology.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2003年第3期267-272,共6页
Chinese Journal of Inorganic Chemistry
基金
国家高技术研究发展计划(863计划)(No.2001AA323020)
北京市科技新星计划资助项目(No.H013610350112)。
