Asphalt-Decomposed Carbon-Coated SnO2 as an Anode for Lithium Ion Batteries
Asphalt-Decomposed Carbon-Coated SnO2 as an Anode for Lithium Ion Batteries
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DOI：
10.1007/s11664-019-07089-7
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发表时间：
2019-03
影响因子：
2.1
通讯作者：
Guodong Liang;Xiaogang Sun;Jia‐mei Lai;Chengcheng Wei;Yapan Huang;Hao Hu;Jingyi Zou;Yuhao Xu
中科院分区：
文献类型：
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作者：
Guodong Liang;Xiaogang Sun;Jia‐mei Lai;Chengcheng Wei;Yapan Huang;Hao Hu;Jingyi Zou;Yuhao Xu
采用水热法在SnO 2表面包覆沥青，经炭化处理后制备了SnO2@C复合阳极。采用扫描电子显微镜、能谱仪、X射线衍射仪和热重分析仪对SnO 2纳米粒子的核壳结构进行了表征。电化学性能测试表明，SnO2@C阳极具有良好的循环性能和较高的比容量。这种核壳结构可以适应SnO 2纳米粒子在充放电过程中的巨大体积膨胀。电极的电导率也明显提高。首次充电容量和库仑效率分别达到1798 mAh/g和65%。在80次循环后，在100 mA/g的电流密度下，容量仍然保持在446 mAh/g。
In this paper, a SnO2@C composite anode was prepared by coating SnO2with asphalt by hydrothermal process and carbonization. The core–shell structure of SnO2nanoparticles was characterized by scanning electron microscopy, energy-dispersive spectrometry, x-ray diffraction and thermal gravimetric analysis. The electrochemical performance tests showed the SnO2@C anode exhibited excellent cycle performance and high specific capacity. The core–shell structure can accommodate the huge volume expansion of SnO2nanoparticles during charge/discharge. The conductivity of the electrode was also obviously enhanced. The first-charge capacity and coulombic efficiency reached 1798 mAh/g and 65%, respectively. After 80 cycles, the capacity still remained at 446 mAh/g at a current density of 100 mA/g.