| SiFe@C负极复合材料的结构及性能 |
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| 引用本文： | 程成,裴和中,唐仁衡,王英,肖方明,周庆,孙泰.SiFe@C负极复合材料的结构及性能[J].复合材料学报,2019,36(7):1674-1683. |
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| 作者姓名： | 程成 裴和中 唐仁衡 王英 肖方明 周庆 孙泰 |
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| 作者单位： | 1.昆明理工大学 材料科学与工程学院, 昆明 650093; |
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| 基金项目： | 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) |
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| 摘 要： | 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。
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| 关 键 词： | 锂离子电池 SiFe@C 负极复合材料 机械球磨 热解温度 碳包覆 |
| 收稿时间： | 2018-08-06 |
Structure and property of SiFe@C anode composites |
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| CHENG Cheng,PEI Hezhong,TANG Renheng,WANG Ying,XIAO Fangming,ZHOU Qing,SUN Tai.Structure and property of SiFe@C anode composites[J].Acta Materiae Compositae Sinica,2019,36(7):1674-1683. |
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| Authors: | CHENG Cheng PEI Hezhong TANG Renheng WANG Ying XIAO Fangming ZHOU Qing SUN Tai |
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| Affiliation: | 1.School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2.Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangzhou 510650, China;3.Guangdong Research Institute of Rare Metals, Guangzhou 510650, China |
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| Abstract: | 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. |
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| Keywords: | lithium ion battery SiFe@C anode composites mechanical ball milling pyrolysis temperature carbon-coating |
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