摘要
用同轴静电纺丝技术成功制备了以碳作为纤维骨架,锡在碳中随机分布并包覆在碳外层的皮芯结构纳米纤维。利用经典静电纺丝纤维直径预测理论,通过调整皮芯层纺丝速度比制备了不同比例皮芯纤维直径的纳米纤维,并将其应用于锂离子负极材料中。采用投射电子显微镜观察了皮芯结构的纤维形貌;利用X射线衍射仪表证了纤维的晶型结构,特别分析了该材料的电化学性能。结果表明:通过纺丝速度比的调节成功获得了不同直径比的皮芯结构纤维;当碳化温度达到800℃时,形成了锡、无定形碳共存的晶型结构;特别是使用纺丝速度比为1∶1时,锂离子电池的循环稳定性最好,循环50圈后,容量保持率达到69%。
Core/shell nanofibers were successfully prepared by co-axial electrospinning, using carbon as the core and Sn/C as the shell. According to the classical electrospinning theory to calculate the diameter of nanofibers, core/shell namofibers with different diameter ratios were prepared by adjusting the speed ratio of electrospinning and the resulting product was applied to the anode material of lithium-ion battery. The morphology of core/shell nanofibers was characterized by transmission electron microscopy. X-ray diffractometer was used to assess the structure of the nanofibers. Especially, the electrochemical properties were detected. The study revealed that core/shell nanofibers with different diameter ratios were obtained by adjusting core/shell eleetrospinning speed ratio; the crystal structure containing tin and amorphous carbon were formed after carbonized at 800℃ ; and when the core/shell electrospinning speed ratio at 1 ： 1, carbon/tin encapsulated carbon nanofibers owned the best cycle stability, the capacity retention is 69% after 50 cycles.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2014年第8期1-4,14,共5页
Journal of Textile Research
基金
国家自然科学基金项目(51163014)
关键词
锡/碳包覆碳纳米纤维
同轴静电纺丝
形貌
电化学性能
tin/carbon encapsulated carbon nanofiber
co-axial electrospinning
morphology
electrochemical property
作者简介
夏鑫（1980-），女，副教授，博士。主要研究方向为功能性纺织材料的开发与应用。E—mail：xjxiaxin@163．com。
