(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 以纳米硅粉(Si)、鳞片石墨(FG)和柠檬酸为原料，通过液相固化-高温热解法制备硅碳(Si/C)复合材料，采用XRD和SEM表征复合材料的结构和形貌；采用不同的黏结剂-聚四氟乙烯(PVDF)和褐藻酸盐(SA)分别对材料的电化学性能进行表征。结果表明：采用PVDF和SA作为粘结剂时，材料首次可逆比容量分别为528.7和538.5 mA?h/g，首次库仑效率分别为69.57%和63.38%，但是采用SA作为粘结剂时材料呈现出良好的循环性能，20次循环后容量保持在90%以上。
关键字: 锂离子电池；负极材料；Si/C复合材料；电化学性能
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The Si/C composite was prepared by pyrolyzing the citric acid mixed with nano-silicon and flake graphite powders. X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were used to characterize the structure and morphology of the composite. The electrochemical performance of the composites was investigated by using two different binders polytetrafluoroethene (PVDF) and sodium alginate (SA), respectively. The results shows the initial capacities of the composite using different binders are 528.7 and 538.5 mA?h/g, respectively, and the initial efficiencies are 69.57% and 63.38%, respectively. However, the composite exhibits a better cycling performance when using the SA binder, and the capacity retention is more than 90% after 20 cycles.
Key words: Li-ion batteries; anode; Si/C composites; electrochemical performance
