%0 Journal Article
%T SiFe@C负极复合材料的结构及性能<br>Structure and property of SiFe@C anode composites
%A 程成
%A 裴和中
%A 唐仁衡
%A 王英
%A 肖方明
%A 周庆
%A 孙泰
%J 复合材料学报
%D 2019
%R 10.13801/j.cnki.fhclxb.20181121.002
%X 以SiFe合金和沥青为原料，采用机械球磨和高温热解法制备了SiFe@C负极复合材料，并对SiFe及一系列不同热解温度下制备的SiFe@C复合材料进行对比研究。利用XRD、SEM、TEM、EDS和恒流充放电测试仪对SiFe@C复合材料的物相、颗粒形貌及电化学性能进行表征。结果表明，在850℃热解温度下制得的SiFe@C负极复合材料首次放电比容量达到1 376.25 mAh/g，首次库仑效率为86.35%，经过70次循环后放电比容量为940.33 mAh/g，库仑效率达到98.78%，容量保持率为76.32%，循环性能远高于SiFe和其他热解温度下的SiFe@C复合材料，而且具有良好的倍率性能。 The SiFe@C anode materials were prepared by mechanical ball milling and high-temperature pyrolysis method with SiFe and pitch as the raw materials, and the characteristics of a series of SiFe@C composites prepared at different pyrolysis temperatures were compared with those of uncoated SiFe. The phase composition, morphology and electrochemical performance of SiFe@C anode composites were detected by XRD, SEM, TEM, EDS and constant current charge-discharge test. The results reveal that the initial discharge specific capacity of SiFe@C composite electrode prepared at 850℃ is 1 376.25 mAh/g with the initial coulombic efficiency of 86.35%. After 70 cycles, the discharge specific capacity is 940.33 mAh/g, the coulombic efficiency is 98.78% and the capacity retention rate is 76.32%, which indicates that its cycling stability and rate capability is much higher than the SiFe and other SiFe@C electrode composites obtained at other temperatures. 广东省自然科学基金（2014A030308015）；广东省省级科技计划项目（2015B010116002；2017A070701022）；广东省科学院实施创新驱动发展能力建设专项（2017GDASCX-0110
%K 锂离子电池
%K SiFe@C
%K 负极复合材料
%K 机械球磨
%K 热解温度
%K 碳包覆<br>lithium ion battery
%K SiFe@C
%K anode composites
%K mechanical ball milling
%K pyrolysis temperature
%K carbon-coating
%U http://fhclxb.buaa.edu.cn/CN/abstract/abstract14514.shtml