Si/C复合纳米纤维负极材料的制备及其性能表征  

Synthesis and Characterization of Si/C Composite Nanofibers for Lithium-Ion Battery Anode

作　　者：屈超群[1] 杜菲[2] 王玉慧[2] 别晓非[2] 魏英进[2] 

机构地区：[1]吉林师范大学功能材料物理与化学教育部重点实验室,吉林四平136000 [2]吉林大学新型电池物理与技术教育部重点实验室,长春130012

出　　处：《吉林大学学报（理学版）》2013年第6期1155-1159,共5页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:51272088)

摘　　要：以聚丙烯晴(PAN)作为高分子聚合物配体和碳源,并添加少量纳米硅粉,利用静电纺丝方法制备Si/C复合负极材料.用热重分析(TG)研究前驱体的分解过程,用X射线衍射(XRD)、Raman光谱和扫描电子显微镜(SEM)研究Si/C复合材料的晶体结构和微观形貌.结果表明:Si/C复合材料具有纳米纤维结构,纤维直径约为350nm,呈交错的网状分布;PAN高温分解产物多为无定形碳;材料在0.1,0.2,0.5,1.0,2.0C下的放电容量分别为735.6,712.1,685.4,492.3,367.9mA·h/g,其倍率性能较好.Si/C composite anode material was successfully fabricated by electrospinning with PAN as macromolecule polymer collocation and carbon source.Decomposition process of the precursor was investigated by thermal gravimetric analysis （TG）,and the structure and morphology of the as-prepared samples were characterized by X-ray diffraction （XRD）,Raman spectrum and scanning electron microscope （SEM）.The result shows that Si/C composite anode material is nanofiber structure.The fiber diameter is about 350 nm with distributing interlaced mesh.PAN decomposition products are mostly amorphous carbon at a high temperature.The electrochemical test results demonstrate that battery discharge capacities are respectively 735.6,712.1,685.4,492.3 and 367.9mA · h/g at 0.1,0.2,0.5,1.0 and 2.0 C,and this material has very excellent rate performance.

关 键 词：锂离子电池 静电纺丝 负极材料 纳米纤维 

分 类 号：TM912.9[电气工程—电力电子与电力传动]