Free-standing single-walled carbon nanotube/SnO2 anode paper for flexible lithium-ion batteries
Free-standing single-walled carbon nanotube/SnO2 anode paper for flexible lithium-ion batteries
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DOI：
10.1016/j.carbon.2011.10.049
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发表时间：
2012-03-01
期刊：
影响因子：
10.9
通讯作者：
Liu, Hua-Kun
中科院分区：
文献类型：
--
作者：
Noerochim, Lukman;Wang, Jia-Zhao;Liu, Hua-Kun
以多元醇法合成的单壁碳纳米管（SWCNT）/氧化锡（SnO 2）杂化材料为原料，通过真空抽滤法制备了自支撑单壁碳纳米管/氧化锡（SWCNT/SnO 2）负极纸。从场发射扫描电子显微镜和透射电子显微镜，碳纳米管形成一个三维的纳米多孔网络，其中超细SnO 2纳米粒子，其微晶尺寸小于5 nm，分布，主要是作为单壁碳纳米管束的表面上的纳米粒子组。电化学测量表明，具有34重量%的阳极纸，SnO 2具有优异的循环保持率，在25 mA g（-1）的电流密度下，超过100次循环的比容量为454 mAh g（-1），远高于相应的原始CNT纸。单壁碳纳米管可以作为一个灵活的机械支持应变释放，提供一个有效的导电通道，而纳米级的氧化锡提供了高容量。SWCNT/SnO 2柔性电极可以弯曲到非常小的曲率半径，并且仍然功能良好，尽管电池的电导率略有下降。电化学响应在初始和进一步的循环过程中得以维持。这种能力表明，这种模型对于需要柔性和可弯曲锂离子电池的应用具有很大的前景。(C)2011爱思唯尔有限公司版权所有。
Free-standing single-walled carbon nanotube/SnO2 (SWCNT/SnO2) anode paper was prepared by vacuum filtration of SWCNT/SnO2 hybrid material which was synthesized by the polyol method. From field emission scanning electron microscopy and transmission electron microscopy, the CNTs form a three-dimensional nanoporous network, in which ultra-fine SnO2 nanoparticles, which had crystallite sizes of less than 5 nm, were distributed, predominately as groups of nanoparticles on the surfaces of single walled CNT bundles. Electrochemical measurements demonstrated that the anode paper with 34 wt.% SnO2 had excellent cyclic retention, with the high specific capacity of 454 mAh g(-1) beyond 100 cycles at a current density of 25 mA g(-1), much higher than that of the corresponding pristine CNT paper. The SWCNTs could act as a flexible mechanical support for strain release, offering an efficient electrically conducting channel, while the nanosized SnO2 provides the high capacity. The SWCNT/SnO2 flexible electrodes can be bent to extremely small radii of curvature and still function well, despite a marginal decrease in the conductivity of the cell. The electrochemical response is maintained in the initial and further cycling process. Such capabilities demonstrate that this model hold great promise for applications requiring flexible and bendable Li-ion batteries. (C) 2011 Elsevier Ltd. All rights reserved.