碳热还原法制备Sn-C复合材料及其性能

Preparation and electrochemical characteristics of Sn-C composite materials by carbon-thermal reduction

用碳热还原法制备了Sn-C复合材料,通过XRD及SEM对其进行表征,并通过恒流充放电循环和慢速扫描循环伏安等方法对其电化学嵌脱锂性能做了研究。结果表明:SnO2碳热还原成金属Sn,晶粒尺寸约为42.8nm。该材料的首次嵌脱锂比容量分别可以达到1024.9和632.8mAh/g,循环15周以后的脱锂比容量为395.9mAh/g。

Sn-C composite materials were prepared by carbon-thermal reduction method from SnO2 and active carbon in Ar atmosphere at 950℃. The material was characterized by XRD and SEM. Electrochemical lithium insertion/ emersion character of the material was determined by the constant current charge-discharge and the slow scan cyclic voltammetry methods. The results of XRD and SEM show that SnO2 is reduced to metallic Sn by carbon-thermal reduction method and its Crystal size is around 42.8nm. The initial lithium insertion/emersion special capacities of the material can reach to 1024.9mAh/g and 632.8mAh/g respectively. And emersion special capacities is 395.9mAh/g after 15cycles.