【作者】 李智； 张纪伟； 张经纬；

【Author】 Zhi Li;Ji-wei Zhang;Jing-wei Zhang;National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials,Henan University;

【机构】 河南大学纳米杂化材料应用技术国家地方联合工程研究中心；

【摘要】 具有高理论比容量的锂电池负极材料,如Si、Sn及过渡金属氧化物,作为下一代高能量、高功率密度电池材料受到极大的关注,而解决其充放电过程中巨大的体积变化和低的电子电导率成为了关键。利用静电纺丝技术构建金属/碳纤维复合结构将有助于改善这一问题,其中静电纺丝制备纳米颗粒与聚合物复合纤维的关键因素则是纳米颗粒在聚合物中的分散性。本工作利用研究室前期制备的高分散性纳米ATO湿凝胶作为前驱体,将其分散于聚乙烯吡咯烷酮(PVP)的乙醇/水混合溶液中进行静电纺丝,经过低温预氧化和高温碳化之后,制备得到了Sn-SnSb/C复合纤维,Sn和SnSb纳米颗粒均匀分布在碳纤维内部且粒径较小。复合材料作为锂离子电池负极材料显示出优异的循环性能和倍率性能,这可以归于复合材料的连续相-碳纤维,一方面构建了连续的导电网络,同时,还阻止了内部纳米颗粒的团聚并缓冲电极材料在充放电过程中的体积膨胀。更多还原

【Abstract】 Solving the volume effect of the electrode materials with high theoretical specific capacity,such as Si、 Sn,and the3 d transition metal oxide,is one of the key issues to develop the next generation lithium-ion electrode material with high energy density and high-rate cycling stability.In this study,Sn-SnSb/C composite structure were fabricated by electrospinning,which is a versatile and simple technique for preparing nanofibers.The prepared Sn-SnSb/C nanofibers exhibits a high reversible capacity and stable cycle performance when used as anode materials for lithium-ion batteries.The improved electrochemical performance can be attributed to the uniform dispersion of Sn-SnSb nanoparticles in the carbon nanofibers and the carbon nanofibers can also provide a continuous conductive network and meanwhile buffer the volume change of electrode materials.更多还原