锂离子电池SiO／C负极材料制备与嵌锂性能研究

以沥青为有机碳源，利用高能球磨和高温热解法制备得到一种循环稳定性能和倍率性能均很优异的SiO／C复合材料。采用X射线衍射（XRD）、扫描电镜（SEM），对材料的结构和表面形貌进行表征。通过恒电流充放电和循环伏安测试了材料的电化学性能。结果表明，在100mA／g电流密度下，SiO／C电极的首次放电、充电比容量分别为1223．1mAh／g、827．3mAh／g，30周充电比容量保持在748．1mAh／g。即使在500mA／g电流密度下，仍然保持有430mAh／g左右的可逆容量。

Preparation and Li-intercalating performance research of SiO/C as anode materials for Li-ion battery

An excellent SiO/C composite material which has good cyclic performance and rate ca- pacity was synthesized by high energy ball milling in combination with a following heat-treatment process, and the pitch was used as carbon source. X-ray diffraction （XRD） and scanning electron microscopy （SEM） were used to characterize the structure and surface morphology of the materi- al. The electrochemical performance was tested by constant current and cyclic voltammetry methods. The results indicated that the initial discharge and charge capacity of the SiO/C elec- trode were 1223.1 mAh/g, 827.3 mAh/g, respectively. And the charge capacity at the 30th cy- cle remained at 748.1 mAh/g at 100 mA/g, the reversible capacity remained at 430 mAh/g even if the current density increased to 500 mA/g.