Sn-SnSb/石墨复合材料的制备及电化学性能

Synthesis and Electrochemical Performance of Sn-SnSb/Graphite Composite Materials

以柠檬酸钠为配位剂、NaBH4为还原剂,将Sn!和Sb"盐在水溶液中共还原制得Sn-SnSb合金。X射线衍射和扫描电镜的测试结果表明:所得合金为多相合金,颗粒大小约200nm。将该合金粉和石墨按质量比4∶1经机械球磨形成Sn-SnSb/石墨复合材料,将其作为锂离子电池阳极材料进行电化学性能测试,结果表明,该复合材料可逆容量超过600mAh·g-1,具有良好的循环性能,15次循环内的稳定比容量为461mAh·g-1,而纯Sn-SnSb合金粉15次循环后充电比容量为337mAh·g-1。

Sn-SnSb alloy was synthesized by reducing an NaBH4 in the presence of sodium citrate as a complexant. has a multiphase structure with particle size of about aqueous solution containing Sn（Ⅱ） and Sb（Ⅲ） salts with The results of XRD and SEM show that Sn-SnSb alloy 200 nm. Sn-SnSb/Graphite composite materials were prepared by mechanical milling and the weight ratio of alloy and graphite was 4：1. The electrochemical performance of Sn-SnSb/Graphite composite electrode was investigated. The results show that Sn-SnSb/Graphite, composite materials has a better cycle performance with a stable capacity of 461 mAh·g^-1 after 15 cycles and the reversible capacity exceeds 600 mAh·g^-1, but the charge specific capacity of pure Sn-SnSb alloy is 337 mAh.g^-1 after 15 cycles.