Preparation of Amorphous Carbon-coated Nano-scale SnO_2 and its Performance for Anode Material of Lithium Ion Secondary Battery

Amorphous carbon-coated nano-scale SnO2 powders were prepared by pyrolyzing the mixtures of starch and Sn(OH)4.The structure,morphology and properties of the sample were investigated by XRD,SEM,TEM,STEM-EDX and discharge-charge cycle.The results of XRD,SEM,TEM and STEM-EDX show that amorphous carbon of the sample is flaky and amorphous Carbon-coated SnO2 particles(20-50nm) are distributed in amorphous carbon uniformly.The results of discharge-charge cycle show that the different proportions between SnO2 and amorphous carbon lead to different discharge-charge performances.The specific capacity of the sample(SnO2∶C=1∶1) reaches 404mAh/g which is even stable in twentieth cycle.