Metal-Organic Framework Derived Core-Shell Co/Co3O4@N-C Nanocomposites as High Performance Anode Materials for Lithium Ion Batteries
Metal-Organic Framework Derived Core-Shell Co/Co3O4@N-C Nanocomposites as High Performance Anode Materials for Lithium Ion Batteries
复制标题
金属有机骨架核壳Co/Co3O4@N-C纳米复合材料作为高性能锂离子电池负极材料
DOI：
10.1021/acs.inorgchem.8b00365
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发表时间：
2018
影响因子：
4.6
通讯作者：
Bu Xian-He
中科院分区：
文献类型：
--
作者：
Zhong Ming;He Wei-Wei;Shuang Wei;Liu Ying-Ying;Hu Tong-Liang;Bu Xian-He
金属有机骨架（MOFs）具有结构多样、孔径可调、比表面积大等特点，在许多领域显示出巨大的应用潜力。在这里，我们报道了一种简单的碳化策略，在不同的碳化温度下，从钴基金属有机框架前驱体中获得一系列核壳结构的Co/ co3o4纳米颗粒包裹在氮掺杂的碳壳中。与Co/Co3O4@N-C-600和Co/Co3O4@N-C-800电极相比，Co/Co3O4@N-C-700电极的最大初始放电容量为1535 mAh g-1，最高可逆容量为903 mAh g-1，电流密度为100 mA g-1，循环100次后，倍率性能为774 mAh g-1，电流密度为1.0 a g-1。其优异的电化学性能主要归功于其独特的核壳结构、丰富的石墨碳以及分散良好的Co/ co3o4纳米颗粒通过转化反应提高比容量。
Metal–organic frameworks (MOFs) with diverse structures, adjustable pore sizes, and high surface areas have exhibited awesome potential in many fields. Here we report a simple carbonization strategy to obtain a series of core–shell structured Co/Co3O4nanoparticles encapsulated into nitrogen-doped carbon shells from cobalt-based metal–organic framework precursors at different carbonization temperatures. When it is applied as an anodes for lithium ion batteries, the Co/Co3O4@N-C-700 electrode delivers a maximum initial discharge capacity of 1535 mAh g–1, the highest reversible capacity (903 mAh g–1at a current density of 100 mA g–1after 100 cycles), and the best rate performance (i.e., 774 mAh g–1at a current density of 1.0 A g–1after 100 cycles) in comparison with those of Co/Co3O4@N-C-600 and Co/Co3O4@N-C-800 electrodes. The excellent electrochemical performance could be mainly attributed to the unique core–shell structure, abundant graphited carbon, and the well-dispersed Co/Co3O4nanoparticles which can promote the specific capacity through conversion reactions.