Key Laboratory for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.
Nanoscale. 2018 Apr 26;10(16):7605-7611. doi: 10.1039/c8nr00550h.
The major obstacles which prohibit the practical applications of alloy-type anodes include insufficient ionic/electronic transportations and structural failures. Herein, we report the fabrication of a carbon-coated nanoporous SnSb alloy (NP-SnOxSb@C) and its application as an anode in Li-ion batteries (LIBs). The as-fabricated NP-SnOxSb@C is characterized by SEM and TEM and demonstrates a bi-continuous nanoporous structure. Amorphous carbon is found to be uniformly coated on the alloy surface. When used as an anode for LIB, NP-SnOxSb@C displays a high capacity (850 mA h g-1 after the 50th cycle) and good rate performance of 664 mA h g-1 at 2000 mA g-1. The improved electrochemical performance is mainly due to a high Li+ diffusion coefficient and low charge transfer resistance between the nanoporous structure and conductive carbon layer. The facile material fabrication process and good electrochemical performance enable the practical utilization of this anode for high-performance LIBs.
主要的障碍，阻碍了合金型阳极的实际应用包括不足的离子/电子输运和结构失效。在此，我们报告了一个碳涂层纳米多孔锡锑合金（NP-SnOxSb@C）的制造及其在锂离子电池（LIBs）中的应用作为一个阳极。所制备的 NP-SnOxSb@C 的特点是 SEM 和 TEM 并表现出双连续纳米多孔结构。发现非晶态碳均匀地涂覆在合金表面。用作 LIB 的阳极时，NP-SnOxSb@C 显示出高容量（第 50 次循环后为 850 mA h g-1）和良好的倍率性能，在 2000 mA g-1 时为 664 mA h g-1。电化学性能的提高主要是由于纳米多孔结构和导电碳层之间的高 Li+扩散系数和低电荷转移电阻。这种简便的材料制造工艺和良好的电化学性能使这种阳极能够实际用于高性能 LIBs。
