碳热还原法制备负极复合材料Sn/C

通过碳热还原法,以纳米碳、改性天然石墨为碳源还原SnO2,并用沥青进行二次碳包覆,制备了锂离子电池负极复合材料Sn/C。对样品进行了XRD、SEM分析及充放电性能测试。SnO2被过量的碳还原,形成粒径为1～2μm的金属Sn球。以改性天然石墨为碳源制备的样品,首次充电(脱锂)、放电(嵌锂)比容量分别为412.4 mAh/g和591.1 mAh/g;第20次循环的充电比容量为342.1 mAh/g,库仑效率从第2次循环开始均在97.0%以上。

The synthesis of anode composite Sn/C by carbon-thermal reduction method

Li-ion battery anode composite Sn/C was synthesized via carbon-thermal reduction method,carbon nanospheres,modified natural graphite were used as carbon sources to reduce SnO_2,then it was carbon coated again by pitch. XRD,SEM analyses and charge-discharge test were taken to the sample. SnO_2 was reduced by over-stoichiometric carbon and formed Sn spheres with average particle diameter of 1～2 μm. The specific charge(Li deintercalation)and discharge(Li intercalation) capacities of the sample using modified natural graphite as carbon source were 412.4 mAh/g and 591.1 mAh/g,respectively,the specific charge capacity at the 20th cycle was 342.1 mAh/g,the Coulombic efficiency was over 97.0% from the second cycle.