中文摘要：

通过回流法制备了SnO2纳米小球,再以β-环糊精（β-CD）作为碳源通过水热法制备得到球状纳米SnO2@/C复合材料.扫描电子显微镜和粉末X射线衍射仪测试结果表明,合成的复合材料为直径约为30~40 nm的纳米小球,在SnO2的表面可以看到一层均匀的碳层的包覆.通过碳的包覆,材料的结构稳定性和导电性增强.在100 mA/g的电流密度下,200次循环后,放电比容量稳定在749 mAh/g,而在大电流充放电后（100~800 mA/g）,再次回到100 mA/g的电流密度时,放电比容量仍能保持在620 mAh/g.

英文摘要：

SnO2 nanosphere are prepared by a refluxing method, and SnO2@ C nanosphere have been prepared by hydrothremal with β-eyclodextrin （β-CD）. The results through scanning electron microscopy and X-ray powder diffraction show that the products are SnO2 nanosphere with a diameter of about 30-40 nm which is covered a uni- form carbon layer. After carbon-coated, the structural stability and electrical conductivity of the material are increased. The discharge capacity -current charge and discharge of 100 mA/g. remains 749 mAh/g at current density of 100 mA/g after 200 cycles, and after high （ 100 to 800 mA/g） , the discharge capacity remains 620 mAh/g at current density