SnO2@C锂离子电池负极材料的制备及其性能

通过回流法制备了SnO2纳米小球，再以-环糊精作为碳源通过水热法制备得到SnO2纳米小球/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，所合成复合材料为直径约为30~40 nm的纳米小球，在SnO2的外表面可以看到一层均匀的碳层的包裹. 通过碳的包裹，材料的结构稳定性和导电性增加. 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.

Preparation and Application of Carbon-Coated SnO2 as Anode Material in Lithium Ion Batteries

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