Hollow nanotubular SiOx templated by cellulose fibers for lithium ion batteries
Hollow nanotubular SiOx templated by cellulose fibers for lithium ion batteries
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DOI：
10.1016/j.electacta.2012.04.086
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发表时间：
2012-07-15
影响因子：
6.6
通讯作者：
Chen, Jing
中科院分区：
文献类型：
--
作者：
Guo, Hong;Mao, Rui;Chen, Jing
以纤维素类物质(滤纸)为模板，制备了锂离子电池负极材料SiOx纳米管材料。X射线衍射仪、扫描电子显微镜、透射电子显微镜和高分辨透射电子显微镜分析表明，所合成的纳米管材料保持了滤纸的形态层次结构，每个纳米管由5~20 nm的纳米SiOx组成。在100 mAg(-1)的恒流密度下，其稳定的可逆容量为940mAHg(-1)，50次循环后容量保持率保持在91.5%以上。嵌入在纳米管中的SiOx颗粒的纳米尺度特性保证了锂离子在电极中的快速扩散。由纤维素纤维模板制成的纳米管为电极提供了牢固的骨架，从而避免了电极在充放电过程中的粉化。此外，中空结构提供了足够的空隙空间，充分缓解了因体积变化而产生的机械应力。所有这些因素都是保证SiOx电极具有稳定的电化学性能的原因。(C)2012爱思唯尔有限公司。保留所有权利。
An effective method of using cellulosic substances (filter paper) as template was employed to prepare SiOx nanotubular materials examined as anode for Li-ion battery. According to XRD, SEM, TEM and HR-TEM analysis, the synthesized nanotubular materials retained the morphological hierarchy of the filter paper, and each nanotube was composed of nanosized SiOx ranged from 5 to 20 nm. It exhibits a stable reversible capacity of 940 mAh g(-1) at constant current density of 100 mA g(-1), and capacity retention keeps over 91.5% after 50 cycles. The nano-scale characteristics of SiOx particle embed in the nanotube ensures the fast Li-ion diffusion in the electrode. The nanotube came from cellulose fiber template provides the electrode with firm framework, and thus avoids the electrode to pulverize in the charge-discharge process. Moreover, the hollow structure offers a sufficient void space, which sufficiently alleviates the mechanical stress caused by volume change. All these factors are responsible for the stable electrochemical performance of SiOx electrode. (C) 2012 Elsevier Ltd. All rights reserved.