Carbon Coated Fe3O4 Nanospindles as a Superior Anode Material for Lithium-Ion Batteries
Carbon Coated Fe3O4 Nanospindles as a Superior Anode Material for Lithium-Ion Batteries
复制标题
碳包覆 Fe3O4 纳米锭作为锂离子电池的优质负极材料
DOI：
10.1002/adfm.200801386
复制
发表时间：
2008-12-22
影响因子：
19
通讯作者：
Wan, Li-Jun
中科院分区：
文献类型：
--
作者：
Zhang, Wei-Ming;Wu, Xing-Long;Wan, Li-Jun
采用部分还原法制备了碳包覆Fe 3 O 4纳米纺锤体，并对其进行了扫描电镜、透射电镜、X射线衍射和电化学测试。Fe 3 O 4-C纳米纺锤体显示出高可逆容量（在C/5下类似于745 mA h g（-1），在C/2下类似于600 mA h g（-1）），首次循环中的高库仑效率，以及与裸赤铁矿纺锤体和商业磁铁矿颗粒相比显著增强的循环性能和高倍率性能。这些改进归因于均匀和连续的碳涂层，其具有若干功能，包括：i）保持颗粒的完整性，ii）增加电极的电子传导性，导致在表面上形成均匀和薄的固体电解质界面（SEI）膜，以及iii）稳定所形成的SEI膜。结果清楚地证明了碳涂层的实用性，以改善纳米结构的过渡金属氧化物作为锂离子电池的上级阳极材料的电化学性能。
Carbon-coated Fe3O4 nanospindles are synthesized by partial reduction of monodispersed hematite nanospindles with carbon coatings, and investigated with scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and electrochemical experiments. The Fe3O4-C nanospindles show high reversible capacity (similar to 745 mA h g(-1) at C/5 and similar to 600mA h g(-1) at C/2), high coulombic efficiency in the first cycle, as well as significantly enhanced cycling performance and high rate capability compared with bare hematite spindles and commercial magnetite particles. The improvements call be attributed to the uniform and continuous carbon coating layers, which have several functions, including: i) maintaining the integrity of particles, ii) increasing the electronic conductivity of electrodes leading to the formation Of Uniform and thin solid electrolyte interphase (SEI) films on the surface, and iii) stabilizing the as-formed SEI films. The results give clear evidence of the utility of carbon coatings to improve the electrochemical performance of nanostructured transition metal oxides as Superior anode materials for lithium-ion batteries.