Fe_3O_4/碳纳米管“核-壳”结构的制备及其电化学性能  

Preparation and performance of Fe_3O_4/MWCNTs“core-shell”hybrids used in LIBs

作　　者：方泽炜 乔志军[1,2] 王成扬[1,2] 陈明鸣[1,2] 郑嘉明[1,2] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津大学化学化工协同创新中心,天津300072

出　　处：《化工新型材料》2015年第9期98-100,共3页New Chemical Materials

基　　金：国家自然科学基金面上项目(51172160);国家863计划资助项目(2011AA11A232)

摘　　要：以苯甲醇为溶剂,通过多壁碳纳米管(MWCNTs)上的芳环和苯甲醇苯环之间π-π共轭效应,自由的引入羟基基团,Fe3+静电吸附在MWCNTs网络结构的表面,进而溶剂热法一步合成Fe3O4/碳纳米管(Fe3O4/MWCNTs)"核-壳"复合材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和高倍透射电镜(HRTEM)对样品的结构和形貌进行表征,结果表明Fe3O4尺寸约为10nm,稳固地生长在碳纳米管壁上。Fe3O4/碳纳米管复合材料作为锂离子电池负极材料时呈现出优异的电化学特性:电极材料在充放电速率为0.1A/g下循环100次之后所达到的可逆比容量为487mAh/g,循环稳定性明显优于Fe3O4电极。且在2A/g的大电流密度条件下可达到的可逆比容量为389mAh/g。A one-pot solvethermal process for fabricating Fe3O4/MWCNTs ＂core-shell＂ hybrids using benzyl alcohol as the solvent was realized. Fe^3＋ can eleetrostatieally adsorb on the surface of MWCNTs network owing to the good miscibility based on a-re interaction between the benzene ring of benzyl alcohols and aromatic regions of MWCNTs. The morphology and structure of samples were characterized by X-ray diffraction （XRD） patterns,scanning electron microscope （SEM） and high resolution transmission electron microscope （HRTEM）. The results demonstrated that Fe3O4 nanoparticles with a size of about 10nm were firmly deposited on the surface of MWCNTs. When evaluated as potential cathode materials for lithium-ion batteries, the Fe3O4/MWCNTs exhibited high reversible charge capacity of 487mAh·g^-1 at the discharge/ charge rates of 0.1A·g^-1 after 100 times cycling. The cycling stability of hybrids were much superior to pure Fe3O4 electrode materials. Moreover,the reversible capacity of 389mAh-g^-1 can be obtained even at the rate of 2A·g^-1.

关 键 词：纳米FE3O4 Fe3O4/MWCNTs复合材料 负极材料 锂离子电池 

分 类 号：TB33[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]