Anisotropic Co3O4 porous nanocapsules toward high-capacity Li-ion batteries
Anisotropic Co3O4 porous nanocapsules toward high-capacity Li-ion batteries
复制标题
各向异性Co3O4多孔纳米胶囊用于高容量锂离子电池
DOI：
10.1039/b923834d
复制
发表时间：
2010-01-01
影响因子：
--
通讯作者：
Xue, Dongfeng
中科院分区：
文献类型：
--
作者：
Liu, Jun;Xia, Hui;Xue, Dongfeng
以聚乙烯吡咯烷酮（PVP）为封盖剂，在空气中进行最终热处理，采用溶剂热法成功合成了各向异性柱状多孔Co3O4纳米胶囊。采用x射线粉末衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）等方法对这些长度为~ 1 μm、直径为~ 400 nm的各向异性多晶纳米胶囊进行了表征。详细的证据表明，CoCO3前驱体的生长过程以成核生长、自组织、Ostwald成熟生长机制为主。这些柱状的Co3O4纳米胶囊整合了两个有益的特征：中空腔和多孔壳。当对锂离子电池进行评估时，它们表现出高可逆容量（超过1000 mA h g - 1）和良好的循环性能。
Anisotropic column-shaped porous Co3O4 nanocapsules were successfully synthesized via a solvothermal route using poly(vinyl pyrrolidone) (PVP) as capping reagent and final heat treatment in air. These anisotropic polycrystalline nanocapsules with the length of ∼1 μm and the diameter of ∼400 nm were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods. Detailed proof indicated that the process of CoCO3 precursor growth was dominated by a nucleation and growth, self-organization, and then Ostwald ripening growth mechanism. These column-shaped Co3O4 nanocapsules integrate two beneficial features: hollow cavity and porous shell. When evaluated for Li-ion batteries, they exhibit high reversible capacity (over 1000 mA h g−1) and good cycle performance.