第30卷第8期 2015年8月
文章编号：1000-324X(2015)08-0861-06
无机材料学报 Journal of Inorganic Material
Vol. 30 No. 8 Aug-,2015
DOI:10.15541/jim20140668
无定形SnO2-C复合纤维及其电化学性能研究
杨琪，胡文彬2
(1.上海工程技术大学材料工程学院，上海201620;2.天津大学材料科学与工程学院，天津300072)
摘要：以2-乙基已酸亚锡为原料，通过静电纺丝以及随后在情性气氛中燎烧成功制备出电化学性能优良的 SnO2-C复合纤维。X射线衍射(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)、热重分析(TGA)、扫描电镜(SEM) 和透射电镜(TEM)的分析结果表明：SnOz-C复合纤维具有无定形结构，直径为100-300nm，含碳量约38%。电化学测试结果表明：在50mA/g的电流密度下，无定形SnOz-C复合纤维的首次放电比容量、充电比容量和库仑效率分别为1370.1mAh/g、757.5mAh/g和55.28%；在50mA/g的电流密度下循环80次后，SnOz-C复合纤维的比容量为 611.6mAh/g，没有出现明显的容量衰减。SnOz-C复合纤维高的比容量和良好的循环性能归因于其SnO,均勾分布的SnO,-C复合一维结构。
关键词：无定形结构；二氧化锡；复合纤维；电化学性能
中图分类号：0646
文献标识码：A
Amorphous SnO2-C CompositeFibers and Their Electrochemical Performance
YANG Qi', HU Wen-Bin2
(1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; 2. School of mate rials Science and Engineering, Tianjin University, Tianjin 300072, China)
Abstract: SnO,-C composite fibers with excellent electrochemical performance were successfully synthesized by using tin(ll)2-ethylhexanoate as starting material through electrospinning technique and subsequent calcination in inert atmosphere. The experimental results of X-ray diffraction (XRD), Raman spectroscope, X-ray photoelectron se electron microscope (TEM) show that SnO2-C composite fibers with diameters of 100300 nm have amorphous struc-ture and carbon content of ~38%. The electrochemical test results show that SnO,-C composite fibers exhibit initial discharge specific capacity, charge specific capacity and coulombic efficiency of 1370.1 mAh/g, 757.5 mAh/g and 55.28%, respectively, at current density of 50 mA/g. After 80 cycles at current density of 50 mA/g, the specific ca-pacity of SnOz-C composite fibers remains at 611.6 mAh/g without apparent capacity reduction. Their high specific capacity and excellent cyclic performance are attributed to their one dimensional (1D) structure with homogeneous distribution of SnO2
Key words: amorphous structure; tin dioxide; composite fibers; electrochemical performancc
锂离子电池具有重量轻、储能大、寿命长和无污
染等优点，产泛应用于便携式电子设备和电动汽车或混合动力汽车的能源。目前商业上使用的石墨负极材
收稿日期：2014-12-23；收到修改稿日期：2015-4-15
料的理论比容量较低(372mAh/g)，难以满足未来对高比容量负极材料的需求。过渡金属氧化物具有较高的比容量，引起研究人员的极大兴趣(1-10)，其中SnO2
基金项目：上海高校青年教师国外访学进修计划Shanghai YoungUniversity Teachers Abroad forFurtherStudying 作者简介：杨琪(1969-)，男，博士，副教投.E-mail:qiiyang@163.com