无定形SnO2-C复合纤维及其电化学性能研究

doi:10.15541/jim20140668

摘要/Abstract

摘要：

以2-乙基己酸亚锡为原料, 通过静电纺丝以及随后在惰性气氛中煅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: SnO₂-C复合纤维具有无定形结构, 直径为100~300 nm, 含碳量约38%。电化学测试结果表明: 在50 mA/g的电流密度下, 无定形SnO₂-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1370.1 mAh/g、757.5 mAh/g和55.28%; 在50 mA/g的电流密度下循环80次后, SnO₂-C复合纤维的比容量为611.6 mAh/g, 没有出现明显的容量衰减。SnO₂-C复合纤维高的比容量和良好的循环性能归因于其SnO₂均匀分布的SnO₂-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

Abstract:

SnO₂-C composite fibers with excellent electrochemical performance were successfully synthesized by using tin(II)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 spectroscopy (XPS), thermogravimetric analysis (TGA), scanning electron microscope (SEM) and transmission electron microscope (TEM) show that SnO₂-C composite fibers with diameters of 100-300 nm have amorphous structure and carbon content of ~38%. The electrochemical test results show that SnO₂-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 capacity of SnO₂-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 performance

中图分类号:

O646

杨琪, 胡文彬. 无定形SnO₂-C复合纤维及其电化学性能研究[J]. 无机材料学报, 2015, 30(8): 861-866.

YANG Qi, HU Wen-Bin. Amorphous SnO₂-C Composite Fibers and Their Electrochemical Performance[J]. Journal of Inorganic Materials, 2015, 30(8): 861-866.

图/表 4

图1 静电纺丝得到纤维的SEM照片(a), 煅烧后纤维的低倍SEM照片(b)和高倍SEM照片(c), 煅烧后纤维的低倍TEM照片(d) 和高倍TEM照片(插图是其SAED图案)(e)及其 EDS图谱(f)

Fig. 1 SEM image of electrospun fibers (a), low magnification (b) and high magnification (c) SEM images of calcined fibers, low magnification (d) and high magnification (e) TEM images of calcined fibers (SAED patterns in inset) and correponding EDS pattern

图2 SnO2-C复合纤维的(a)XRD图谱, (b)Raman图谱和(c)TGA曲线

Fig. 2 (a) XRD patterns, (b) Raman spectrum and (c) TDA curve of SnO2-C composite fibers

图3 SnO2-C复合纤维的(a)C1s, (b)O1s和(c)Sn3d3/2的XPS图谱

Fig. 3 (a) C1s, (b) O1s and (c) Sn3d3/2 XPS patterns of SnO2-C composite fibers

图4 SnO2-C复合纤维负极材料的(a)CV曲线, (b)充放电电压曲线, (c)循环性能和(d)倍率性能

Fig. 4 (a) CV curves, (b) charge-discharge voltage profiles, (c) cycle performance and (d) rate performance of SnO2-C composite fibers electrode

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无定形SnO₂-C复合纤维及其电化学性能研究

Amorphous SnO₂-C Composite Fibers and Their Electrochemical Performance

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