水热法制备Sn/C球复合材料及其电化学性能

Electrochemical performance of Sn/C ball composite materials prepared by hydrothermal method

以葡萄糖为碳源,锡酸钠为锡源,通过水热法制备Sn/C球复合材料。结果表明：样品的XRD峰均出现Sn的特征峰,Sn/C球尺寸为100 nm左右,粒径为10~30 nm的Sn颗粒被均匀地包覆在厚约30 nm的碳层中。考察不同水热时间对复合材料电化学性能的影响,水热时间6 h,烧结温度700℃,烧结保温时间2 h时,复合电极材料具有较高的可逆容量,首次可逆比容量为553.3 mAh/g,首次放充电（嵌脱锂）效率为74.7%,经100次循环后,充电比容量保持在500.2 mAh/g,循环效率为99.9%,具有较好的循环性能。

The Sn/C ball composite materials were prepared by hydrothermal method using glucose as carbon source and sodium stannate as tin source.The results show that,XRD peaks of samples have Sn characteristic peaks,Sn/C ball size is of around 100 nm,Sn grain with size of 10 to 30 nm is evenly coated by a carbon layer with thickness of 30 nm.The effect of hydrothermal reaction time on electrochemical performance of composite materials was studied.When hydrothermal reaction time is 6h,sintering temperature is 700 ℃,heatholding time is 2 h,the composite can obtain good reversible capacity of 553.3 mAh/g,and the discharge/charge effectiveness of the first time reaches 74.7%;even after 100 discharge/charge cycles the Sn/C ball composite materials have good circulation performance with specific charging capacity remains 500.2 mAh/g,and the circulating effectiveness is 99.9%.