Self-assembled hierarchical 3D-NiO microspheres with ultra-thin porous nanoflakes for lithium-ion batteries
Self-assembled hierarchical 3D-NiO microspheres with ultra-thin porous nanoflakes for lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2015.10.044
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发表时间：
2016-01-20
影响因子：
9.2
通讯作者：
Seo, Jeong Gil
中科院分区：
文献类型：
--
作者：
Jadhav, Harsharaj S.;Thorat, Gaurav M.;Seo, Jeong Gil
过渡金属氧化物作为下一代锂离子电池的负极材料引起了极大的关注。在这里，我们报告的制备自组装分层3D-Ni 0微球与超薄多孔纳米片的简单和成本有效的尿素辅助化学共沉淀法，然后在不同的温度下退火。值得注意的是，退火温度对不同形貌的形成有影响，并对电化学性能产生影响。这种具有超薄多孔纳米片的分层3D-Ni 0微球显示出增强的电化学性能，具有大的可逆容量、上级循环性能、高倍率性能和改善的离子电导率，作为锂离子电池的阳极材料。优化后的NiO样品在0.5C循环150次后的可逆容量高达795 mAhg（-1），在10 C循环下的可逆容量大于460.2mAhg（-1）。特别是，电化学性能的增强归因于高的比表面积，颗粒之间良好的电接触，以及更容易的锂离子扩散。(C)2015 Elsevier B. V.版权所有。
Transition metal oxides have attracted great attention as an anode material for next generation lithium ion batteries. Here we report the preparation of self-assembled hierarchical 3D-Ni0 microspheres with ultra-thin porous nanoflakes by simple and cost effective urea assisted chemical co-precipitation method followed by annealing at different temperature. It is noteworthy that the annealing temperature has an impact on the formation of different morphologies and resultantly on the electrochemical performance. This hierarchical 3D-Ni0 microspheres with ultra-thin porous nanoflakes shows enhanced electrochemical performance with a large reversible capacity, superior cyclic performance, high rate capability, and improved ionic conductivity as an anode material for lithium ion batteries. A high reversible capacity up to 795 mA h g(-1) after 150 cycles at a rate of 0.5 C, and a capacity higher than 460.2 mA h g(-1) at a rate as high as 10 C were obtained for optimized NiO sample. In particular, enhancement of the electrochemical performance was attributed to the high specific surface area, good electric contact among the particles, and easier lithium ion diffusion. (C) 2015 Elsevier B.V. All rights reserved.