碳包覆空心Fe3O4纳米粒子作为锂离子电池负极材料的电化学性能研究  

Electrochemical performance of carbon encapsulated hollow Fe_3O_4 nanoparticles as anode material for lithium-ion batteries

作　　者：孙杰[1] 赵东林[1] 刘辉[1] 景磊[1] 迟伟东[1] 沈曾民[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《功能材料》2012年第15期2027-2030,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50672004);国家高技术研究发展计划(863计划)资助项目(2008AA03Z513)

摘　　要：以二茂铁为铁源,石油渣油为碳源,通过加压热解和空气氧化制备了碳包覆空心Fe3O4纳米粒子。采用X射线衍射(XRD)、透射电镜(TEM)以及高倍透射电镜(HRTEM)等测试方法对样品的形貌和结构进行表征。采用恒流充放电和交流阻抗方法测试碳包覆空心Fe3O4纳米粒子作为锂离子电池负极材料的电化学性能。在电流密度为0.2mA/cm2时,首次放电比容量高达1294.7mAh/g,30次循环之后其放电比容量为392.1mAh/g;电流密度为1mA/cm2时,首次放电比容量为216.3mAh/g,30次循环之后其放电比容量为113mAh/g。Carbon encapsulated hollow Fe3O4 nanoparticles have been successfully synthesized via co-carbonization and oxidation in the air. The morphologies and structural features of the sample were investigated by X-ray diffraction （XRD）,transmission electron microscope （TEM） and high-resolution TEM （HRTEM）. The electrochemical performance testing showed that the first reversible specific capacity of the carbon encapsulated hollow Fe304 nanoparticles was as high as 1294.7mAh/g at a current density of 0.2mA/cm2. After 30 cycles the reversible specific capacity was still maintained at 392. lmAh/g. Even at a high current density of lmA/cm2 , the first reversible specific capacity was 216.3mAh/g and remained at 113mAh/g after 30 cycles.

关 键 词：锂离子电池 碳包覆空心Fe3O4纳米粒子 负极材料 电化学性能 

分 类 号：O646.21[理学—物理化学]