以葡萄糖为碳源,锡酸钠为锡源,通过水热法制备了三维多孔C球包覆纳米SnO2复合材料.结果表明:样品的XRD谱线都出现SnO2的特征峰,多孔SnO2/C球尺寸为100 nm左右,10～50 nm的SnO2颗粒被均匀地包覆在约30 nm的多孔碳层中.考察了水热时间对复合材料电化学性能的影响,在水热时间6h、烧结温度500℃、烧结保温时间2h的条件下,复合电极材料具有较高的可逆容量,首次可逆比容量为581.0 mAh/g,首次放充电(嵌脱锂)效率为66.48％,经50次循环后,充电比容量保持在502.9 mAh/g,循环效率为99.9％,具有较好的循环性能.%The porous SnOz /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 patterns of the samples have SnO2 characteristic peaks, porous SnO2/C ball size was about 100 nm, SnO2 grain with 10 nm to 50 ran was evenly coated in a-bout 30 nm porous carbon layer. Influence of hydrothermal reaction time on electrochemical performance of the composite materials was studied. With hydrothermal reaction time 6 h, sintering temperature 500 ℃, heat preservation time 2 h, the porous composite material exhibited good reversible capacity 581. 0 mAh/g, which was 66. 48% of that at the first time. After 50 cycles the charging capacity remained 502. 9 mAh/g, and the capacity sustain is 99. 9%. Thus it has good circulation performance.
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