Li4Ti5O12/Fe3O4复合材料的制备及其电化学性能

Synthesis and Electrochemical Properties of Li4Ti5O12/ Fe3O4 Compound

摘要:

以醋酸锂和钛酸四正丁酯为原料制备了纯相Li4Ti5O12，再用简单的水热法合成Li4Ti5O12/ Fe3O4纳米粒子复合物作为锂离子电池的负极材料，通过XRD、SEM以及电池测试系统对纯相Li4Ti5O12和Li4Ti5O12/ Fe3O4复合物进行了结构、形貌及电化学性能测试。结果表明，制得的复合物具有较好的球形结构且粒径较小(200~300nm)，综合电化学性能较好。由于复合的Fe3O4有较高的理论容量，该Li4Ti5O12/ Fe3O4纳米颗粒复合物表现出比纯相Li4Ti5O12大的容量，在1C下循环100圈后Li4Ti5O12/ Fe3O4的放电比容量仍能达到550.5mA?h/g，同时也表现出比纯相Li4Ti5O12更优的倍率性能。

Abstract:

PureLi4Ti5O12 was prepared from lithium acetate andtetrabutyltitanate. ThenLi4Ti5O12/ Fe3O4 compound was synthesized as anode material for lithium ion batteries by simple hydrothermal method. XRD, SEMand battery testing system were employed to characterize the structure, morphology and electrochemical properties of pure Li4Ti5O12 and Li4Ti5O12/Fe3O4 compound. The results show that the prepared compound has a good spherical structure, a small particle size(200~300nm), and the electrochemical performance is good. Due to the high theoretical capacity of Fe3O4, the Li4Ti5O12/Fe3O4 nanoparticle compound exhibits a much larger capacity than the pure phase Li4Ti5O12,which can reach around 550.5mA?h/g, and the compound also exhibits superior rate performance over pure Li4Ti5O12.