还原-热扩散合金化法制备锂离子电池SnSbFe合金负极材料

An introduction of the preparation of SnSbFe alloy-based anode material for lithium ion battery by reduction-thermal diffusion alloying

文中通过化学还原-热扩散合金化方法,制备了类方形纳米结构SnSbFe合金复合材料。SnSbFe合金颗粒分布均匀,颗粒大小为250 nm左右。与同样方法制备的纳米级Sn2Fe合金复合材料相比,SnSbFe合金复合材料的电化学性能有显著提高。该方法制备的合金复合材料通过减缓材料充放电过程中的体积变化,抑制去合金化过程中纳米锡的团聚现象,从而显著提高材料的循环性能。Sn2Fe合金复合材料首圈和第80圈放电比容量分别为694、78.6 mAh/g。而SnSbFe合金复合材料首圈和第80圈放电比容量分别为1138、406 mAh/g。

In this paper,a quasi-square nanostructured SnSbFe alloy composite was prepared by chemical reduction-thermal diffusion alloying method.The particles of SnSbFe alloy are uniformly distributed,and the particle size was about 250 nm.Compared with the nano-scale Sn2Fe alloy composite prepared by the same method,the electrochemical property of the SnSbFe alloy composite has been significantly improved.The alloy composite prepared by this method buffers the volume change in the process of charge and discharge,and at the same time suppresses the agglomeration of nano-tin during the dealloying process,thereby significantly improving the cycling performance of the material.The specific discharge capacities of the first and 80th cycle of the Sn2Fe alloy composite were 694 mAh/g and 78.6 mAh/g,respectively.However,the specific discharge capacities of the first and 80th cycle of the SnSbFe alloy composite were 1138 mAh/g and 406 mAh/g,respectively.