Preparation and electrochemical performance of copper foam-supported amorphous silicon thin films for rechargeable lithium-ion batteries
Preparation and electrochemical performance of copper foam-supported amorphous silicon thin films for rechargeable lithium-ion batteries
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DOI：
10.1016/j.jallcom.2010.11.156
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发表时间：
2011-02
影响因子：
6.2
通讯作者：
Haixia Li;F. Cheng;Zhiqiang Zhu;H. Bai;Zhanliang Tao;Jun Chen
中科院分区：
文献类型：
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作者：
Haixia Li;F. Cheng;Zhiqiang Zhu;H. Bai;Zhanliang Tao;Jun Chen
通过射频磁控溅射在泡沫铜上沉积非晶硅薄膜，用作可充电锂离子电池的阳极材料。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线粉末衍射（XRD）对所制备的Si薄膜的形貌和结构进行了表征。通过循环伏安法和充放电测量研究了以所制备的硅薄膜为负极材料的锂离子电池的电化学性能。结果表明，所制备的非晶硅薄膜的电极性能受沉积温度的影响较大。在300℃的最佳温度下沉积的薄膜电极在0.2C的充放电电流密度下，经过30次循环后，比容量可达~2900mAh/g，库仑效率高于95%。泡沫铜支撑的硅薄膜中的Li+扩散系数确定为2.36×10−9cm2/s。
Amorphous Si thin films, which have been deposited on copper foam by radio-frequency (rf) magnetron sputtering, are employed as anode materials of rechargeable lithium-ion batteries. The morphologies and structures of the as-prepared Si thin films are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). Electrochemical performance of lithium-ion batteries with the as-prepared Si films as the anode materials is investigated by cyclic voltammetry and charge–discharge measurements. The results show that the electrode properties of the prepared amorphous Si films are greatly affected by the deposition temperature. The film electrode deposited at an optimum temperature of 300°C can deliver a specific capacity of ∼2900mAh/g and a coulombic efficiency above 95% at charge/discharge current density of 0.2C after 30 cycles. The Li+diffusion coefficiency in copper foam-supported Si thin films is determined to be 2.36×10−9cm2/s.